GUSSET STYLE POUCH, IN PARTICULAR FOR FOOD PRODUCT

Abstract

The gusset style pouch is provided with a resealable closure system configured to selectively define a top opening of the pouch, at the opposite from a bottom, at least one strip of this system being adapted for locking an open configuration, by engaging locking elements that pivot and cause interengagement between the strips of the closure system. The locking elements are integrally formed with at least one strip of the system and made of a semi rigid plastic material, less flexible than material of the pouch sidewalk An elongated predetermined measuring utensil of shorter length than height of an interior pouch volume can be stored along the sidewall by use of a holding part formed on the strip as a lower extension. A leveling can also be performed using a free edge below the interlocking area.

Claims

1-20. (canceled)

21. A gusset style pouch, comprising: a flexible bag comprising a bottom, a front wall and a rear wall defining a flexible sidewall extending around a longitudinal axis, two junctions at opposite sides between the front wall and the rear wall, so that the flexible bag defines a single opening opposite to the bottom; a closure system comprising a first strip sealed to one amongst the front wall and the rear wall and a second strip sealed to the other one amongst the front wall and the rear wall, the first strip and the second strip being interlockable strips for attachment at an interlocking area in a closed configuration of the closure system, the first strip including at least one locking element; a hold open arrangement comprising: i) a first predetermined flexing line adjacent to one of the two junctions, ii) a second predetermined flexing line adjacent to the other of the two junctions, and iii) a main flexible part extending between a first end partly delimited by the first predetermined flexing line and a second end partly delimited by the second predetermined flexing line, a locking element of said at least one locking element being rigidly coupled to the first end and configured to pivot from a first flat configuration obtained when the closure system is in the closed configuration to a second configuration, which is a bent, flexed, or engaged configuration; wherein the main flexible part and said at least one locking element are formed by the first strip which is made of a determined semi rigid plastic material, and wherein the second strip, which is made of a semi rigid plastic material, defines at least one contact surface for retaining said at least one locking element in the second configuration, whereby the first strip and the second strip of the closure system define the hold open arrangement.

22. The gusset style pouch according to claim 21, wherein the first strip and the second strip are extruded strips made of a single piece of a polyolefine material.

23. The gusset style pouch according to claim 21, wherein the at least one locking element comprises two locking elements that define two opposite locking tabs rigidly coupled to the first end and the second end and each configured to pivot from the first flat configuration to the second configuration, and wherein the second strip defines two spaced contact surfaces, each adjacent to one of the two junctions, for retaining the two locking tabs in the second configuration.

24. The gusset style pouch according to claim 23, wherein the two locking tabs are cut and are oriented according to opposite directions in the first flat configuration.

25. The gusset style pouch according to claim 24, wherein the main flexible part is hingedly connected at said first flexing line to a pivot portion of the first strip distinct from any one of the two junctions and hingedly connected at said second flexing line to an opposite pivot portion of the second strip distinct from any one of the two junctions, the two junctions being longitudinal junctions extending parallel to a longitudinal axis of the sidewall.

26. The gusset style pouch according to claim 25, wherein the flexible bag defines a single interior volume between the bottom, the two longitudinal junctions and the interlocking area, and wherein the first strip and the second strip have each opposite ends that extend outside the interior volume and form part of said two longitudinal junctions.

27. The gusset style pouch according to claim 21, comprising a removable top portion that defines a sealing contact at the opposite from the bottom and prevents access to the closure system, a line of weakness or at least one pre-cut being defined between the removable top portion and the closure system.

28. The gusset style pouch according to claim 21, comprising an upper end provided with a pair of opposite pull members that protrude upwardly from the first strip and the second strip in the first flat configuration, the pull members being spaced away from the two junctions and rigidly coupled to the first strip and the second strip for facilitating opening of the closure system and causing flexing of: the main flexible part that belongs to the first strip, and a complementary flexible part of the second strip, facing the main flexible part with a space in an open configuration of the closure system.

29. The gusset style pouch according to claim 28, wherein the first and second strips are each provided with complementary anchoring elements so that the closure system is resealable, a sealing contact being continuously formed by the anchoring elements.

30. The gusset style pouch according to claim 28, wherein each of the first strip and the second strip has an upper edge provided with two rectilinear upper rim portions separated by one of the pull members, and wherein the first strip and the second strip have each a height, measured from the rectilinear rim portions, that increases with increased space from the pull member of the corresponding strip.

31. The gusset style pouch according to claim 23, wherein the first flexing line and the second flexing line are each provided with a pair of two longitudinally spaced hinge connections of lower thickness as compared to the thickness of the locking tabs).

32. The gusset style pouch according to claim 31, wherein the locking tabs are each delimited by a cut and hinged at a base thereof, the base of each of the locking tabs extending between the hinge connections of a same pair, the locking tabs being each provided with a rectilinear sliding edge configured to extend along the second strip in said second configuration.

33. The gusset style pouch according to claim 32, wherein in at least one of the first strip and the second strip, the hinge connections have a determined material thickness less than 50 percent of a material thickness of the adjacent locking tab.

34. The gusset style pouch according to claim 21, wherein the hold open arrangement comprises at least two locking tabs rigidly coupled to a same end chosen amongst the first end and the second end of the main flexible part.

35. The gusset style pouch according to claim 21, wherein the flexible bag contains: edible material, and a measuring utensil provided with a cup and a handle, which is adapted to be stored in an interior volume defined by the flexible bag, entirely below anchoring elements of the closure system in a storage configuration of the measuring utensil, and wherein the first strip or the second strip is provided with a holding part made of strip material and configured to maintain the measuring utensil in the storage configuration by a retaining contact at an end of the handle.

36. The gusset style pouch according to claim 35, wherein the handle of the measuring utensil is provided with an insertion housing, and the retaining contact is obtained by clamping of the holding part into the insertion housing.

37. The gusset style pouch according to claim 35, wherein the holding part is provided with a free edge that defines a leveling element distal relative to a junction between the holding part and the interlocking area.

38. A method of producing a gusset style pouch, comprising: providing a flexible bag having a flexible sidewall by attaching a front wall to a rear wall at two junctions, so that the front wall and the rear wall define a single opening opposite to a bottom of the flexible bag (B); adding a closure system by sealing a first strip to the front wall and a second strip to the rear wall, the first strip (8) and the second strip being interlockable strips for attachment at an interlocking area in a closed configuration of the closure system, each of the first strip and the second strip being made of a single piece; wherein the method comprises cutting and/or weakening parts of one determined strip chosen amongst the first strip and the second strip of the closure system, which is made of a determined semi rigid plastic material, in order to define a first predetermined flexing line adjacent to one of the two junctions and a second predetermined flexing line adjacent to the other of the two junctions, so that a main flexible part of the determined strip extends between a first end partly delimited by the first predetermined flexing line and a second end partly delimited by the second predetermined flexing line, cutting strip material of the determined strip to define locking means rigidly coupled to at least one of the first end and the second end and configured to pivot from a first flat configuration obtained when the closure system is in the closed configuration to a second configuration, which is a bent, flexed, or engaged configuration; and wherein the other strip, which is also made of a semi rigid plastic material, is sealed at the opposite of the determined strip to define at least one contact surface for retaining a locking element of said locking means in the second configuration, whereby the first strip and the second strip of the closure system define a hold open arrangement of the gusset style pouch.

39. The method of claim 38, wherein each of the first strip and the second strip are cut from a continuous extruded band of a same polyolefin material and said determined strip is cut to define two opposite locking elements, and wherein the two opposite locking elements are defined before a final cut to define a length of the determined strip and after forming anchoring elements of the determined strip.

40. The method of claim 38, wherein two respective ends of the first strip are each placed in a margin bonding area of the front wall used to define the junctions, when sealing the first strip to the front wall, wherein two respective ends of the second strip are each placed in a margin bonding area of the rear wall used to define the junctions, when sealing the second strip to the rear wall, and wherein the junctions are obtained by longitudinally bonding side edges of the font wall and the rear wall, parallel to the first predetermined flexing line and the second predetermined flexing line.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0104] FIG. 1A is a side view of the gusset style pouch with the closure system mounted to a bag in an open position in accordance with one embodiment;

[0105] FIG. 1B is a side view of the gusset style pouch with the closure system mounted to a bag in a closed position in accordance with one embodiment;

[0106] FIGS. 2A and 2B show, respectively, the first strip and the second strip used in the closure system in accordance with a first embodiment;

[0107] FIG. 3 is a section view of the first strip of FIG. 2A in a non-bent configuration;

[0108] FIG. 4 is a section view similar to FIG. 3, showing the closure system in an open position in accordance with the first embodiment;

[0109] FIG. 5 shows the first strip used in the closure system in accordance with a second embodiment;

[0110] FIG. 6 illustrates a cutting step performed to obtain the flexing lines and two locking elements in the first strip in accordance with a third embodiment;

[0111] FIG. 7 is a detail view illustrating position of a locking element of the first strip of

[0112] FIG. 6, in an open position of the closure system;

[0113] FIG. 8A is a schematic cross-sectional side view of a flexible pouch similar as illustrated in FIGS. 1A-1B;

[0114] FIG. 8B is a schematic cross-sectional side view of a flexible pouch before removal of a top portion;

[0115] FIG. 8C illustrates a first strip used in the closure system in accordance with a fourth embodiment;

[0116] FIG. 9A is a perspective view of a measuring utensil provided with a rear slit and wrapped in a bag;

[0117] FIGS. 9B and 9D illustrate, respectively, a top view of the handle of a measuring utensil adapted to be stored along a flexible side panel of the pouch;

[0118] FIG. 9C is a rear view of the measuring utensil of FIG. 9B, showing the rear slit;

[0119] FIG. 10 illustrates a leveling operation, using a contact part that protrudes from a lower face of one of the strips of the closure system;

[0120] FIG. 11 is a perspective view of a flexible pouch in an open configuration, showing a storage position of a measuring utensil;

[0121] FIG. 12 illustrates a first strip used in the closure system in accordance with a fifth embodiment;

[0122] FIG. 13 schematically illustrates a method to obtain the strips of the closure system in accordance with an embodiment;

[0123] FIG. 14 schematically illustrates a first strip used in the closure system in accordance with another embodiment;

[0124] FIG. 15 is a perspective view showing a closure system provided with interengaged anchoring elements;

[0125] FIG. 16 schematically illustrates a first strip used in the closure system in accordance with another embodiment;

[0126] FIG. 17 is a perspective view showing a part of a closure system having specific anchoring elements;

[0127] FIGS. 18A, 18B, 18C, 18D, 18E, 18F are respective sectional views showing different examples for the anchoring elements;

[0128] FIG. 19 is a perspective view similar to FIG. 17, showing a locking tab in a part of a closure system;

[0129] FIG. 20 is a detail of FIG. 19, showing a shoulder arrangement suitable for receiving the sliding edge of the locking tab in an open position of the closure system.

DETAILED DESCRIPTION

[0130] In the various figures, identical reference numerals designate identical or similar elements.

[0131] It should be noted that the following detailed description and illustration are directed to flexible pouches that are releasable for containing a variety of products, preferably food products such as dry or powdered beverages, liquid or frozen single-strength beverages, concentrated juices, dry soups, baking mixes, cooking oils, salted snacks, dry and instant cereals, dried fruit, nuts, coffee, tea, spices, milk powder and other food products. Optionally, wet food, medications, tobacco, cold remedies, mouthwash, baking mixes, laundry soaps and softeners, chemicals, other non-edible products could form suitable contents.

[0132] As shown in FIGS. 1A-1B and 8A-8B, the pouch 1 is a packing container having a flexible bag B and a closure system 2. The bag B comprises a bottom 3, a front wall 4 and a rear wall 5 defining a flexible sidewall. Here, the front wall 4 and the rear wall 5 are interconnected at two longitudinal junctions 6a, 6b extending parallel to a longitudinal axis X of the sidewall. The two longitudinal junctions 6a, 6b may correspond to two stiffening welds (permanently sealed sides) of the bag B.

[0133] The front wall 4 and the rear wall 5 define an opening 7 opposite to the bottom 3. In some embodiments, the bag B made of flexible material is provided with at least one gusset having an interior edge extending between the respective inner faces of the front wall 4 and the rear wall 5. A mono-web construction may be used to obtain the bag B.

[0134] Here, the bottom 3 is defined by a lower wall provided with a fold (so as to typically define a midsection 14 of gusset, here intersected by the longitudinal axis X). Such lower wall may be configured as a seat for the pouch 1. A W-shape can be used to define the bottom 3 as shown in FIGS. 8A-8B. In such non limiting examples, the pouch 1 belongs to the group of the self-standing resealable pouches, so that the pouch 1 is suitable to display optional content information marked on an outer surface of the bag in an upright position. But of course, the bottom 3 may be configured differently and one or more gussets may optionally be provided laterally, preferably at a distance from the opening 7. When two optional gussets are laterally interconnecting the front wall 4 and the rear wall 5, it is understood that such gussets belong to the flexible sidewall and define the two longitudinal junctions 6a, 6b. Stiffening welds can be provided to have a sealing between the front wall 4 and the gussets and/or a sealing between the rear wall 5 and the gussets.

[0135] In some embodiments, the bag B can be a mono-web construction of a film. But in preferred embodiments, the front wall 4, the rear wall 5 and the bottom 3 are obtained by assembling at least two different parts. Here with reference to FIGS. 1A-1B and 8A-8B, the bag B is obtained by assembling three parts (a lower wall and two flexible sidewall panels P1, P2 that are superimposed over one another and sealed together).

[0136] The bag B includes several seal areas 11a, 11b, 12a where the two flexible sidewall panels P1, P2 are sealed together, e.g., heat-sealed. Here, the panels P1 and P2 are sealed together along side peripheral edges to form the longitudinal junctions 6a, 6b respectively, and optionally along a top peripheral edge 12 to form top seal 12a (FIG. 8B). Bottom peripheral edges 3a and 3b of sidewall panels P1 and P2, respectively, can also be sealed to one another to form a bottom seal and thereby complete a closed pouch structure. However, in a particularly preferred embodiment of the present invention illustrated in FIGS. 8B and 8B, a bottom gusset panel P3 having at least one fold is attached to the inner surface of sidewall panels P1 and P2. These panels P1, P2 here define the flexible front and rear walls 4, 5. The portion of the bottom gusset panel P3 above seal lines is not attached to the inner surface of the sidewall panels P1 and P2 such that midsection 14 of gusset is free and extends up into the interior of the bag B in a pleated fashion.

[0137] Alternatively, the bottom gusset panel P3 and the sidewall panels P1 and P2 can be made from the same web of material. The bottom gusset panel P3 can be formed by folding the bottom portion of the continuous web in a W section as disclosed in U.S. Pat. No. 3,380,646 issued to Doyen et al.

[0138] More generally, it is understood that in an open state of the pouch 1, the flexible bag B defines an interior volume V having at least three sides (bottom side, right side and left side) that are sealed, whereby the opening 7 of the bag B opposite to the bottom 3 defines a single opening 7 of the bag B. The interior volume V has here a determined height H measured between the bottom 3 and the single opening 7. The longitudinal junctions 6a and 6b may be as long as the determined height H, as illustrated in FIG. 1A.

[0139] The film material used to form the bag B can be plastic, such as low, medium or high density polyethylene, polypropylene, polyester (PET), polyamide or any other material that is commonly used in the packaging industry, copolymers, or blends thereof. The film material can be a single layer cast or blown film, a multi-layer coextrusion or laminate. The film material can also include one or more layers of paper, metal foil, vacuum deposited metal or inorganic layer of aluminium or silicon oxide and/or a polymer barrier layer, such as ethylene vinyl alcohol or polyvinylidene chloride (or other barrier material). Of course, such materials are non limiting examples.

[0140] It is an important aspect of the invention that the material is flexible and capable of allowing a gusset to be formed. If the film is a multi-layer film, it is preferred that at least the inner layer of the bag B is a heat sealable layer.

[0141] Now referring to FIGS. 2A-2B and 8A-8B, it can be seen that the closure system 2 comprises two strips 8, 9 that are fixed one each other at the respective junctions 6a, 6b. Such strips 8, 9 here define two halves of the closure system 2 and are arranged as a fitment proximate the opening 7. The first strip 8 of the closure system 2 is sealed to the front wall 4, while the second strip 9 is sealed to the rear wall 5. The inner layer of the bag B is thus covered by two strips 8 and 9, which are made of a semi rigid material. The strips 8, 9 are typically sealed in a continuous manner to prevent any leak between the bag B and the strips 8, 9. This is of interest when adding inert gas inside the pouch 1 after filling with the content 13.

[0142] Such semi rigid material, typically extruded polymeric material, can be the same for the two strips 8 and 9. The semi rigid material (relatively stiff and resilient, optionally having memory characteristics) can be high-density polyethylene, low-density polyethylene, polypropylene, polystyrene, PET, Nylon?, any other polymeric material feasible in the context of the present invention, or any combination thereof. The term memory is intended to mean the phenomenon where a material returns to its original, unstressed configuration after having been deformed to a stressed configuration and the deforming force causing the deformation has been removed.

[0143] In preferred embodiments, the two opposite ends 8a-8b, 9a-9b (see FIGS. 2A-2B) of the two strips 8 and 9 are sealed in two areas that belong to or interfere with the longitudinal junctions 6a, 6b. Such ends 8a-8b, 9a-9b thus extend outside the interior volume V and form part of the two longitudinal junctions 6a, 6b.

[0144] As shown in the FIGS. 1A-1B, 2A-2B, 5, 8A-8C and 11, the two strips 8 and 9 may be provided each with a pull member 16 or 18 that protrudes upwardly from an upper rim. This upper rim surrounds the opening 7 in an open state of the pouch 1. A plane of the opening 7 is defined by such upper rim. Here in the first strip 8, two rectilinear upper rim portions 81, 82, separated by the pull member 16, are provided. In the second strip 9, two rectilinear upper rim portions 91, 92, separated by the pull member 18, are also provided. Such upper rim portions 81, 82, 91, 92 at the upper edges 8c and 9c of the strips 8 and 9 define a plane of the opening 7, as apparent in view of FIGS. 1A and 11 in particular.

[0145] The pair of opposite pull members 16, 18 are optionally in contact with each other in a first flat configuration of the closure system 2 as shown in FIG. 1B. The pouch 1 assumes a generally flat configuration (especially at a distance from the bottom 3) after it has been formed, filled, and sealed. The pull members 16, 18 are spaced away from the two longitudinal junctions 6a, 6b. Here they define central tabs, with similar height or with a difference of height. Alternatively, the pull members 16, 18 can be arranged differently at the upper end of the closure system 2, possibly with a shift and/or a small spacing between the opposite pull members 16, 18.

[0146] Preferably as shown in FIGS. 2A-2B, the height H1 of the pull members 16, 18 is substantially the same and can be lower than 15 or 20 mm. The pull members 16, 18 are rigidly coupled to the main flexible parts 28, 29 of the strips 8 and 9. With such arrangement, fingers of the user are well positioned, very close to the plane of the opening 7, and it prevents the pull members 16, 18 to be flexed. It is understood that appropriate pressure (outwardly for actuating the opening and inwardly for actuating the closure) is exerted without too significant effort for the user.

[0147] Referring to FIGS. 8A-8B, the pouch 1 is optionally provided with a top peripheral edge 12 and, before a cutting or tearing or peeling action to remove such top part of the pouch 1, the content of the pouch 1 cannot be poured or retrieved through the single opening 7. In other words, the content 13 (powdered milk or other granular or powdery product for example) is perfectly preserved in the pouch 1 until used for the first time when the top peripheral edge 12 is removed, optionally with the aid of one or more peeling-off tongues, tearing tongues, weakened areas or the like. Here, as simple cut along the dash line (a rectilinear dash line in this non limiting example as shown in FIGS. 8B and 8C) is sufficient to provide access to the content because the closure system 2 is not in the first flat configuration. Preferably, the upper level 19 of the content 13 extends below the closure system 2.

[0148] Of course the dash line could also be non rectilinear. For instance, the top peripheral edge 12 could be removed without flexible material remaining at the left and right sides of the corresponding pull member 16 or 18.

[0149] The top portion 120 of the pouch 1 is preferably provided with a line of weakness 12b (at the dash line) that extends laterally across both walls 4 and 5 in close proximity to but below the top peripheral 12a and above the strips 8, 9, described below. The line of weakness 12b may be formed by, for example, perforating or scoring the front wall 4 and the rear wall 5 with a laser or knife either individually before these walls 4 and 5 are sealed together, or collectively after they have been sealed together. One or both ends of line of weakness 12b preferably terminate with a notch 12c (see FIG. 8C), which provides a stress concentration and aids in starting a tear along the line of weakness 12b when the pouch 1 is opened by a consumer.

[0150] More generally, any binding means that define a tight seal at the top peripheral edge 12 can be provided to have the resealable closure system 2 protected before the first use. Here pull members 16 and 18 are covered by the binding means. But alternatively, the pull members could extend externally with respect to the film material or foils 21, 22 defining the bag material. In such case, the pull members (not shown) protrude radially outwards from a part of the bag B in the upper end of the pouch 1, so that such part of the bag B is sandwiched between a strip 8 or 9 and the corresponding pull member.

[0151] After the first use, as illustrated in FIGS. 4, 8A and 11, the closure system 2 is in a second configuration, with the front wall 4 and the rear wall 5 widely spaced thanks to a hold open arrangement defined by the two strips 8 and 9.

[0152] More precisely, one of the strips 8 and 9 sealed to the bag B, here the first strip 8, is provided with:

[0153] a first predetermined flexing line 25a adjacent to one of the two junctions 6a and not defined at one end 8a (corresponding end used to define the junction 6a) of the strip 8,

[0154] a second predetermined flexing line 25b adjacent to the other of the two junctions 6b and not defined at the other end 8b (corresponding end to define the junction 6b) of the strip 8,

[0155] a main flexible part 28 (see FIGS. 3-4 in particular) extending between a first end 28a, here partly delimited by the first predetermined flexing line 25a, and a second end 28b which is here partly delimited by the second predetermined flexing line 25b,

[0156] opposite pivot portions 31 and 32, including a first pivot portion 31 interconnecting the first end 28a to the end 8a and a second pivot portion 32 interconnecting the second end 28b to the end 8b.

[0157] Two opposite pivot portions 31 and 32 are preferably provided in the same strip 8 near the opposite ends 8a and 8b, in order to provide a spacing between the main flexible part 28 and the junctions 6a, 6b that are typically more rigid. In the first strip 8, the main flexible part 28 thus can be hingedly connected at the first and second flexing lines 25a and 25b to the pivot portions 31, 32 that are not attached to the second strip 9 (such pivot portions thus being distinct from any one of the two junctions 6a, 6b). As shown in FIG. 11, the thickness at the junctions 6a-6b can be about twice the thickness (here a constant thickness e1 as shown in FIG. 3) defined in the main flexible part 28 and in the ends 8a, 8b.

[0158] In the first strip 8 and optionally in the second strip 9, the flexing lines 25a, 25b extend longitudinally and are obtained by locally reducing the thickness. As shown in FIG. 2A, the distance d between the flexing lines 25a, 25b and the junctions 6a, 6b is reduced and is typically inferior or equal to 10 mm, preferably comprised between 2 mm and 5 or 6 mm. Referring to FIG. 3, the determined thickness e2 of the semi rigid material is for example equal or less than 50 percent of a material thickness e1 of the main flexible part 28. This determined material thickness e2 is preferably defined by respective outer slots 35, 36, 37, 38 that longitudinally extend from the upper edge 8c or 9c of the strip 8 or 9 to the lower edge 8d or 9d. The same thickness profile can optionally be provided in the second strip 9.

[0159] As illustrated in FIGS. 2A, 4 and 11, the first end 28a and the second end 28b of the flexible part 28 can be each provided with a locking tab 41, 42, so as to define the locking means of the hold open arrangement. While the first strip 8 is here described as having two locking tabs 41, 42, other arrangements can be provided, for instance with only one protruding locking element provided in the first strip 8 and/or one or more optional protruding locking elements formed in the second strip 9.

[0160] Respective hinge connections, here spaced hinge connections 44a-44b and 45a-45b, are provided where the material thickness is locally reduced. The position of the first predetermined flexing line 25a corresponds to the alignment position of the pair of hinge connections 44a and 44b. The locking tab 41 is delimited by a cut and hinged at a base 41a thereof. An opposite locking tab 42 is also delimited by a cut and hinged at a base 42a thereof, as shown in FIGS. 2A and 5. It is understood that the base 41a or 42a of each of the locking tabs 41, 42 here extends between two hinge connections 44a-44b, 45a-45b. With such arrangement, the locking tabs 41, 42 are configured to pivot between a flat configuration (when the strips 8, 9 of the closure system 2 are fastened one to each other) and a second configuration that is a bent, flexed or engaged configuration (when the strips 8, 9 are bent as shown in FIGS. 1A, 4 and 11).

[0161] Each locking tab 41, 42 may have an length (measured between the base 41a, 42a and the outer sliding edge) of about 2 mm. More generally it is preferred that such length be superior to the nominal thickness e1 of the first strip 8 but not superior to a threshold where the tab 41, 42 is significantly bent from the base 41a, 42a. Preferably, such length does not exceed three times the nominal thickness e1 of the first strip 8.

[0162] It should be noted that the interlocking area 10, in the first flat configuration of the closure system 2, is elongated along a virtual axis Y that intersects the upper hinge connections 44a and 45a, and which is perpendicular to the longitudinal axis X.

[0163] FIG. 6 illustrates that the hinge connections 44a-44b and 45a-45b can be defined by a simple cutting operation performed after having the anchoring elements 51 formed on the inner face of the first strip 8. Similar operation can be performed to obtain the second strip 9 but only the slots 37, 38 can be defined as two locking elements on the first strip 8 may be considered as sufficient. In a variant, each of the strips 8, 9 is provided with one or more locking elements such as locking tabs 41, 42.

[0164] Referring to FIG. 7, it can be seen that one or more of the slots can be defined as inner slots. It is also understood that the hinge connections 44a-44b and 45a-45b can be optionally shifted with respect to the base 41a, 42a of the locking tabs 41, 42, as shown in FIGS. 6-7. This can be advantageous to have a longer locking tab 41, 42, 141, 142 without increasing the distance d between the flexing lines 25a, 25b and the junctions 6a, 6b. Such space can be as low as 5 mm or less for the first strip 8. A corresponding distance can be identical in the second strip 9 when provided with similar flexing lines.

[0165] Now referring to FIG. 4, it can be seen that the locking tabs 41, 42 are flexed when the strips 8, 9 are widened. The actuation at the pull members 16, 18 (when gripped and pull away one from each other) causes the main flexible parts 28, 29 to be conformed according to an annular shape. Since the junctions 6a, 6b are sufficiently rigid and the adjacent pivot portions 31, 32 are very short when viewed in a transverse plane, such pivot portions 31, 32 are not significantly flexed (they still have a substantially flat aspect).

[0166] At the respective flexing lines 25a, 25b, the ends 28a and 28b of the main flexible part 28 are thus in an angled configuration as compared to the junctions 6a, 6b. Because of such angle, the respective locking tabs 41, 42 are orientated away form the adjacent junction 6a or 6b and abut against respective contact surface CS1, CS2 of the second strip 9. The contact surfaces CS1 and CS2 may be each adjacent to one of the two junctions 6a, 6b. When slots 37, 38 are provided to delimit the main flexible part 29 of the second strip 9, it is understood that such contact surfaces CS1 and CS2 extend at opposite ends 29a, 29b of the main flexible part 29. As well illustrated in FIG. 4, the optional slots 37, 38 are advantageous to define predetermined flexing lines in the second strip 9 that are exactly facing the flexing lines 25a, 25b, so that pivot portions 31, 32 are also present in the second strip 9.

[0167] More generally, it is understood that any locking element arranged proximate the pivot portions 31, 32 can be retained by such kind of contact surface CS1, CS2 when the closure system 2 is in a second flexed or bent configuration, as illustrated in FIG. 4.

[0168] This open configuration corresponds to a predetermined configuration because of the hold open arrangement, which is here defined by the strips 8, 9 (only two pieces of plastic material is the advantageous depicted embodiments). Indeed, with locking elements such as the locking tabs 41, 42, a bistable pull-snap hold open arrangement is defined by the strips 8 and 9. As the strips 8, 9 extend as far as ends 8a-8b and 9a-9b inserted in the junctions 6a, 6b and are used to define the closure system 2, such hold open arrangement is robust.

[0169] In accordance with one embodiment of the present invention, the pouch 1 comprises at least one locking element or similar locking means. As used herein, the term locking, and derivative terms thereof, refers to a structure that can be held in place by friction, adhesion or other forces feasible in the context of the present invention. The term locking and derivative terms thereof may also refer to the engagement of a structure comprising more than one semi-rigid locking tab 41, 42, 141, 142 (see FIG. 5 for instance) or similar elements.

[0170] To open the pouch 1 as shown in FIG. 11, anchoring elements 51, 52 of the closure system 2 have to be disengaged. This is performed by simply grasping the upper portion of opposing walls 4, 5 and/or the optional pull members 16, 18 and pressure manually given to separate the anchoring elements 51, 52 is sufficient to have the strips 8, 9 sufficiently bent (beyond an angle threshold).

[0171] When angle between the main flexible part 28 and one or more of the pivot portions 31, 32 reaches a predetermined threshold, at least one of the ends 28a, 28b (preferably the two ends 28a, 28b) reaches a lock position, maintaining an open configuration. Closing the mechanism only requires a slight pressure, typically by exerting thumb or finger pression against the pull members 16, 18 or other parts of the strips 8, 9 that define the closure system 2. Memory characteristics of the strip material are preferred to facilitate reclosing in a tight manner.

[0172] Of course, the locking elements that here protrude and are configured as locking tabs 41, 42 are rigidly coupled to the respective first end 28a and the second end 28b and configured to pivot from a first flat configuration obtained when the closure system 2 is in the closed configuration to a second configuration, which is a bent, flexed, or engaged configuration.

[0173] The locking tabs 41, 42 can be provided with a sliding edge 49 generally parallel with that of the pivot portions 31, 32, which engages the corresponding contact surface CS1 or CS2 of the second strip 9. Because of the engagement by the locking tabs 41, 42 and since the first strip 8 having the locking tabs 41, 42 and the second strip 9 are made of a semi rigid material, the main flexible part 28 is held (here in a bent configuration) in a separated orientation relative to that of the second strip 9.

[0174] Referring to FIGS. 1A, 4 and 8A, it is understood that the complementary anchoring elements 51, 52 used to define the interlocking area 10 remain widened because of the specific orientation of the main flexible part 28. Additionally, the contact between the locking tabs 41, 42 and the corresponding contact surfaces CS1, CS2 can cause the second strip 29 to be similarly bent. For this purpose, slots 37, 38 (FIG. 4) are optionally provided proximate corresponding pivot portions 31, 32 of the second strip 9.

[0175] As well apparent in view of FIGS. 2A-2B and 3-4, each of the main flexible parts 28 and 29 is adapted to be easily bent due to a reduction in height at least in intermediate strip areas that extend between a central area provided with gripping means (pull members 16, 18) and the respective ends 8a, 8b, 9a, 9b. The minimal height in such intermediate strip areas defines the minimal height of the main flexible parts 28, 29. Such minimal height is inferior to 20 mm for instance in a preferred option.

[0176] Each strip 8, 9 is fixedly secured to the bag material in elongated areas parallel to the upper rim portions 81, 82, 91, 92. Such elongated areas may have a height inferior or equal to the minimal height of the main flexible parts 28, 29. Accordingly, the respective pivot portions 31, 32 of the strips 8, 9 are not attached to the bag material since they extend below the elongated areas for securing the strip 8 to the bag material. Advantageously with such arrangement, there is no interference between: [0177] expansion of the bag material near the opening 7 when pulling the pull members 16, 18 to open the gusset pouch 1 on the one hand, and [0178] relative movement between the tabs 41, 42 and the surrounding areas (including the pivot portions 31, 32) around the tabs 41, 42, on the other hand,
so that the tabs 41, 42 can pivot and be easily (and repeatably) displaced locally away from the bag material, every time the closure system 2 is open.

[0179] The pivot portions 31, 32 of the second strip 9 are also preferably not attached to the bag material for similar reasons. Especially, it is to be underligned that the respective outer slots 35, 36, 37, 38 may play efficient role for the locking effect, as illustrated in FIGS. 3-4 in particular.

[0180] In the first flat configuration of the closure system 2 as shown in FIG. 1B, it is understood that the inner mating surfaces of the strips 8, 9 can be substantially in a same longitudinal virtual plane defined by the two opposite junctions 6a, 6b. In contrast in the second configuration, such mating surfaces are generally between about 90 degrees and 180 degrees of separation relative to one another.

[0181] In the first flat configuration, a sealing contact is continuously defined by the anchoring elements 51, 52. As the two strips 8, 9 cooperate to allow the bag B to be opened and sealed repeatedly, it is understood that the reclose feature is performed by anchoring elements 51, 52 that are not made of brittle material. The reclose feature may correspond to a zipper type feature. As used herein, the expression zipper type feature includes press-to-close zippers.

[0182] In some constructions, slide-style zippers can be used, preferably with the strips 8, 9 directly forming parts of such zipper. Numerous other types of reclose features, especially a Velcro? type feature as illustrated in FIGS. 8A-8B, could be used to form the anchoring elements 51, 52.

[0183] Such anchoring elements 51, 52 may include male and female securement means, for instance male members in the first strip 8 and female members in the second strip 9 or vice versa. In a first embodiment (FIGS. 2A-2B and 3) and in a second embodiment (FIG. 5), such sealing contact is obtained by continuous mating surfaces provided in the anchoring elements 51, 52 and in the pivot portions 31, 32, while the ends 8a, 8b are deprived from such anchoring elements 51, 52. Accordingly, the longitudinal sealing between the ends 8a and 8b does not interfere with the interlocking area 10.

[0184] The strip 108 of the second embodiment essentially differs from the strip 8 of the first embodiment in that additional locking tabs 141 and 142 are provided, as shown in FIG. 5. Three hinge connections may be provided to define the flexing lines 25a, 25b. It can be seen that the two upper locking tabs 41 and 42 are cut and oriented according to opposite directions in the first flat configuration. Similarly, the two lower locking tabs 141 and 142 are cut and oriented according to opposite directions in the first flat configuration.

[0185] In a third embodiment as shown in FIG. 6, the closure system 2 can be provided with pivot portions 31, 32 that are not containing any anchoring elements 51, 52 so that the interlocking area 10 is shorter than the distance L6 measured between the junctions 6a, 6b in the closed configuration of the closure system 2. Indeed, the interlocking area 10 is only provided in the main flexible part 28. As the pivot portions 31, 32, 37, 38 can be short portions which are not oriented substantially differently in the second open configuration, the closure system 2 is still efficient to seal access to the content 13. In particular, the strips 8, 9 are sufficiently fastened in the first flat configuration to prevent insect from passing in the interior volume V.

[0186] For having a good barrier effect (against humidity in particular), first and second embodiments are preferred. In a fourth embodiment as shown in FIG. 8C in particular, the anchoring elements 51 (here under form of a band) extend over the whole width or almost such width of the pouch 1. For instance, the end 8b of the strip 308 (which is sealed to the end 9a of the strip 9) also comprises a margin part of the anchoring elements 51. Such configuration is efficient to have a good barrier effect when the closure system 2 has been manually closed by the user. Such arrangement for the anchoring elements 51, 52 can be used, of course, in the other depicted embodiments.

[0187] Referring to FIG. 12, a fifth embodiment is shown with a first strip 408 very similar to the strip 108 of the second embodiment, but with anchoring elements 51 that extend between upper locking tabs 41, 42 and lower locking tabs 141, 142. Such embodiment is of interest to have a robust hold open arrangement and provide more space above the interlocking area 10 for the fingers when grasping the pull members 16, 18. Of course, the second strip (not shown) is provided with corresponding anchoring elements 52 and with two flexible parts (one above the interlocking area 10 and the other below the interlocking area 10) to form the opposite contact surfaces engaged by the locking tabs.

[0188] It is understood that strips 8, 9 having one or more intermediate sections of lower height as compared to the height at the ends 8a-8b, 9a-9b can be preferred. As shown in FIGS. 2A-2B, 5 and 11, amount of plastic can be saved, while having robust junctions at the ends 8a, 8b, 9a, 9b since height is greater. In such preferred embodiments, for at least one of the strips 8 and 9, there is an increase of height (here measured from the rectilinear rim portions 81, 82, 91, 92 of the upper edge 8c or 9c) with increased space from the pull member 16 or 18.

[0189] It is also understood that the main flexible parts 28, 29 can flex more easily when having a reduced height, for instance as low as 6 mm or less (minimum of height, at a distance from the ends 8a, 8b,9a, 9b). It should also be noted that the anchoring elements 51, 52 may act as stiffening elements of the corresponding strip 8 or 9.

[0190] The anchoring elements 51, 52 may be either integrally formed with strips 8, 9 (using the same plastic material) or coextruded with the strips 8, 9 or overmoulded. When not using the same material, the anchoring elements 51, 52 are for example made of a flexible material having a lower modulus than that of the strip material used to define the flexible parts 28, 29, the pivot portions 31, 32, 31, 32 and the ends 8a-8b, 9a-9b.

[0191] In the closed state of the closure system 2, as illustrated in FIGS. 15 and 16, the locking tabs 41, 42 planarly extend in the first strip 8 but are free to pivot independently with respect to the front wall 4. Here in a preferred embodiment as illustrated in FIG. 15, the first strip 8 comprises a first outer surface s1 continuously sealed to the front wall 4 and at least one second outer surface s2 not sealed to the front wall 4 (see also FIG. 8A). Such second outer surface s2 is provided with the locking means (here defined by the locking tabs 41, 42). The locking tabs 41, 42 are thus proximal (but not immediately adjacent, in preferred options) to the part of the strip 8 adhered to the front wall 4 and can simultaneously:

[0192] precisely follow general movement of the first strip 8 when handled by the user; and

[0193] pivot around the respective flexing lines 25a and 25b in a wide open configuration, as the locking tabs 41, 42 are not retained by the front wall 4 of the bag B.

[0194] While each locking tab 41, 42, 141, 142 has been illustrated as flush with the inner surface of the strip 8, 108, 208, 308, the closure system 2 may be provided with at least one tab 41, 42 having an excess in thickness E4 in the closed configuration of the closure system 2, as in embodiments of FIGS. 19-20. Due to this excess E4, the locking tab 42 defines a bulged part BP protruding externally relative to the outer face of the corresponding strip 8. Typically, the same applies for the locking tab 41.

[0195] Additionally or alternatively, one tab 42 of the strip 8 may engage in a recess 39 of the strip 9 when the closure system 2 is in the open configuration. Typically a shoulder 39a (FIG. 20) defines a receiving surface for the sliding edge of the locking tab 42 when the strips 8, 9 are bent (as in FIGS. 1A and 4). Here, the bulged part BP of the locking tab 42 is higher than wide and the shoulder 39a has same height than this part of the tab 42, which is of interest to have a sufficient length of contact between the shoulder 39a and the locking tab 42.

[0196] Cuts 48a and 48b, which extend parallel to the longitudinal direction of the strips 8, 9, delimit an upper end and a lower end of the locking tab 42. Such cuts 48a, 48b may be longer than width of the bulged part BP. As a result, the flexing line 25b extends at a distance from the part having the excess in thickness E4. This is advantageous to keep flexibility along the flexing line 25b at the base 42a. The foil 21 of the bag B (as shown in FIG. 11) is in contact with the bulged part BP in a non adhering area of the foil 21, thus not interfering with the bending of the tab 42 when the strip 8 is bent. The bag foil 21 is firmly attached to the strip 8 at least above the tab 42 and in the side junction 6a.

[0197] In the embodiment shown in FIGS. 19-20, the strips 8, 9 may be obtained by injection for example. More generally, the bulged or thickened area is of interest to increase the tension and angle in the open configuration of the closure system 2. Of course, such configuration with the bulged or thickened area may optionally apply to define all or part of the tabs in the strips 108, 208, 308 shown in FIGS. 5, 6 and 8C.

[0198] In FIG. 19, the closure system 2 may be provided with any kind of anchoring elements 51, 52, preferably with elongated anchoring elements 51, 52 extending entirely above the lockings tabs.

[0199] In preferred embodiments, each tab 41, 42, 141, 142 is hinged at a base 41a, 42a, 141a, 142a that defines a determined height h2 less than half the height H8 of the strip 8, 9 at the corresponding flexing line 25a, 25b. The following relation may be satisfied: h2/H8?2/5. The determined height h2 may be superior or equal to 4 or 5 mm. When a shoulder 39a is provided for engagement by the tab 42, such shoulder 39a is defined at a distance from the lower edge 8d and may have same height (height h2) as the base 42a of the tab 42.

[0200] Apart areas where the strips 8, 9 are punched to define the slots 35, 36, 37, 38, it can be seen that the thickness e1 of each strip 8, 9 is relatively high, for example superior or equal to 1 mm. Due to semi rigid material used to define the strips 8, 9, the anchoring elements 51, 52 are typically elongated and sufficiently flexible.

[0201] Referring to FIG. 16, the number of anchoring elements 51, 52 in one strip 8 may be greater (here four elements 51) than the number of anchoring elements 52 (here three elements 52) in the other strip 9. Here, the anchoring elements 51, 52 are defined by mushroom-shaped stems on each inner face of the strips 8, 9. Such mushroom-shaped stems may provide an efficient snap (possibly an audible snap) when the two inner faces mate. The engagement is performed at a thin outer edge of the respective heads 54 of the mushroom-shaped stems 53. The overlapping distance D1 between opposite heads 54 may of about 1 mm only, in order to make separation of the strips 8, 9 easier.

[0202] More generally, it is of interest to have a low ratio D1:e1, for example inferior or equal to 1:5. This provides a very good compromise between the need for rigidity at the locking elements 41, 42 and the need for flexibility at the interlocking area. The rod-like parts 53 of the anchoring elements 51, 52 extend parallel and have a same length D3, which may be superior to the size D2 of the heads 54 (the size D2 being measured in same direction as longitudinal extension of the rod-like parts). The spacing D4 between the strips 8, 9 in the region adjacent to the anchoring elements 51, 52 may be equal to the nominal thickness e1, and is here of about 1 mm for instance. Of course, other shapes may be used for the anchoring elements 51, 52, in complement or in replacement of the illustrated shapes. In some examples, tips may be used to replace some of the mushroom-shaped stems.

[0203] Referring to FIGS. 17 and 18A-18F, it can be seen options where the fitment defined by the strips 8, 9 is obtained by injection. It is understood that the shape of the anchoring elements 51, 52 may vary. In all options, the anchoring elements 51, 52 extend at a distance from the tabs 41, 42 that are provided respectively in the first end 28a and the second end 28b.

[0204] The method of manufacturing the pouch 1 may proceed, inter alia, in the following manner. The walls of the bag B, here defined by two opposite panels P1 and P2 and the optional gusset wall P3 (see FIGS. 8A-8B) are produced each in a conventional manner. The flexible material of the bag B can include plastic and is preferably a multilayer compound forming a very effective oxygen barrier when the product is powdered milk, for example. However, it may, of course, be a bag B produced from another material, in particular metal or composite material (one or more multilayer boards could also form at least some parts of the bag B).

[0205] Referring to FIG. 13, the first strip 8, 108, 208, 308, 408 and the second strip 9 may be separately produced from a polyolefine material, preferably PP, using an extrusion apparatus 60 and a forming roller 62. A barrel or similar section of the extrusion apparatus 60 melts and forces the molten plastic 20 through a die 61 into the nip 64. More precisely, the molten plastic 20 (also called molten resin) is continuously introduced to a gap formed along a peripheral surface of the rotating forming roller 62, such that the plastic forms at least a part of the strip-form base of the strip 8, 108, 208, 308, 408 or 9 at the peripheral forming roller surface and fills an array of fixed cavities defined in the rotating roller 62 to form portions of the fastener/anchoring elements 51, 52 as projections extending from a side of the sheet-form base. Here, the continuous band of molten plastic 20 may be as narrow as one strip 8 or 9 and the anchoring elements 51 can be formed as shown at the top of FIG. 6, before a cutting step. The cavities in the roller 62 are typically shaped to form anchoring elements 51 adapted to engage loops. When the anchoring elements 51, 52 form a zipper closure, the cavities may be replaced by one or more grooves having the complementary profile (constant profile) with respect to the desired shape for the anchoring elements 51, 52.

[0206] A base roller 63 is used in a conventional manner to have sufficient pressure when molding the anchoring elements 51 or 52. Such configuration is particularly suitable to define hook-like anchoring elements 51 in the first strip 8. The second strip 9 provided with the loops or similar anchoring element 52 can be obtained in a conventional manner, and may optionally combine two layers of material (a base layer and a layer for forming the loops). Optionally, the loops are not necessarily totally closed loops and can be arranged as female hooks having a pronounced curvature, which are more flexible that the male hooks.

[0207] More generally, it is understood that the anchoring elements 51, 52 can be provided with a great multiplicity of fastener members (for example hooks and loops) or with continuous fastener members (for example press-to-close zippers or the like).

[0208] The strips 8, 108, 208, 308, 408, 9 provided with the anchoring elements 51, 52, after passing the nip 61, may travel around the periphery of the roller 62 and optionally around a stripping roller 67 which assists in pulling the strip 8 or 9 and extracting each relief from the corresponding cavity of the roller 62, and thence to a windup device, not shown.

[0209] At least for the first strip 8, 108, 208, 308, 408, a cutting step is performed by cutting means 65, 66, here downstream with respect to the roller 67. Indeed, the section S8 of the continuous band, obtained just after operation by the roller 62, has to be cut, in order to have:

[0210] the locking tabs 41, 42, 141, 142 or similar locking means;

[0211] the slots 35, 35, 37, 38;

[0212] optionally a specific profile at the upper edge 8c, 9c, preferably with a pull member 16 or 18 at a midsection;

[0213] optionally a specific profile at the lower edge 8d, 9d, preferably with removal of plastic material at a distance from the ends 8a, 8b, 9a, 9b of the strips 8, 9, a holding part 55 for a measuring utensil 100 and/or a free edge 56 of a leveling element being also optionally defined.

[0214] The cutting means may comprise one or more modules 65, 66. Here, the locking means are precut and obtained using longitudinal cuts and transverse cuts. The cutting means are thus adapted to perform cuts at short distance from the strip ends 8a, 8b such a shown in the non-limiting example of FIG. 6. One ore more locking tabs 41, 42, 141, 142 or similar locking elements are formed in the strip material and are able to form protrusions in the second configuration. Some parts, instead of being cut (using a cut module to define slots 35, 36, 37, 38), can be weakened by any suitable means (for example, by forming recesses when forming the anchoring elements 51, 52).

[0215] The first strip 8, 108, 208, 308, 408 and the second strip 9 are each cut from a continuous extruded band and the same polyolefin material is preferably used to define the closure system 2.

[0216] At least one of the strips 8, 108, 208, 308, 408, 9 may optionally be obtained by combining more than one layer of extruded plastic material. For instance, a sheet-form base may serve as support for an outer layer provided with the anchoring elements 51, 52. Of course, if an outer layer is supplied, such outer layer become permanently bonded to the molten plastic of the base layer and become part (when solidifying the resin) of the strip-form base of the strip 8, 108, 208, 308, 408 or 9 so that one cannot distinguish the two layers on the final strip.

[0217] After a cooling step, it is understood that the semi rigid plastic material of the continuous band has memory features and is typically stiff, for instance as stiff as Nylon? and in a plastic material less brittle as Nylon? (preferably with an elastic modulus superior to 1 GPa). Polypropylene, Polyethylene (HDPE, LDPE) and similar materials (including PEF) may be used because the living hinges defined at the flexing lines 25a, 25b, are stronger and the locking tabs 41, 42, 141, 142 are stiff enough.

[0218] The strips 8, 108, 208, 308, 408, 9 having the anchoring elements 51, 52 are retrieved, preferably after a final cut (not shown) to define a length of the strip 8, 108, 208, 308, 408 or 9. These strips 8, 108, 208, 308, 408, 9 are then each bonded to either the inner face of the front wall 4, or the inner face of the rear wall 5.

[0219] Of course, the first strip 8, 108, 208, 308, 408 and the second strip 9 of a same closure system 2 may be obtained simultaneously from a same sheet of plastic material (with a longitudinal junction intersected by a virtual median transverse plane of the sheet). In such case, a folding step may advantageously be performed to obtain a closed configuration of the closure system 2. Then a longitudinal cut is performed to separate, at a lower edge defined by the longitudinal junction, the first strip 8, 108, 208, 308, 408 and the second strip 9. A slot may be initially provided at the junction when extruding the two adjacent strips. This facilitates the folding operation toward the closed configuration of the closure system 2 before attachment to the bag B.

[0220] FIGS. 8C and 12 show typical position of the first strip 308, 408, with the ends (here only the end 8b is shown) interfering with a margin bonding area 30 of the front wall 4. Such margin bonding area 30 is used to define the junction 6b (operating bonding area during the fastening between the front wall 4 and the rear wall 5). Preferably, each end 8a, 8b, 9a, 9b of the strips 8, 108, 208, 308, 408, 9 can be placed in such manner, in order to have these strips partly inserted in the junctions 6a, 6b.

[0221] The junctions 6a, 6b (which can extend between the bottom 3 and the top peripheral edge 12 or other suitable end beyond the opening 7) and at least one lower seal are obtained in a first sealing step before a filling step. In some constructions, the bottom peripheral edges 3a and 3b extend transversally to the longitudinal junctions 6a, 6b and two lower corner portions CP1, CP2 are defined at intersection between the junctions 6a, 6b and the edges 3a, 3b, respectively. The top seal 12a at the top portion 120 is defined in a second sealing step after the filling step for filling the interior volume V with the content 13.

[0222] In some embodiments an additional box, typically more rigid than the bag B, can be provided to house one or more pouches 1. While the embodiments depicted in the figures show rectangular margin bonding areas 30, it is understood that other shapes can be used, depending of the kind of pouch 1 to be produced. Additionally, some steps such as one ore more cutting steps could be performed at earlier or later stage. The hinge connections 44a, 44b, 45a, 45b thus are not necessarily formed by a slitting operation performed after molding (or similar forming) of the anchoring elements 51, 52.

[0223] In some constructions, the hinge connections 44a, 44b, 45a, 45b can be formed by die cutting, or directly in an injection molding process, or laser engraving, among other possible techniques. In some constructions, the hinge connections 44a, 44b, 45a, 45b can have a material thickness that is 10 percent or less of a material thickness of the adjacent locking tab 41, 42 and the adjacent pivot portion 31, 32. The material thickness of the hinge connections 44a, 44b, 45a, 45b can be between about 0.2 mm and about 0.5 mm in some constructions.

[0224] In some constructions, the hinge connections 44a, 44b, 45a, 45b are provided by a separate material and/or multi-piece hinge mechanism coupled between the main flexible part 28 or 29 and each locking tab 41, 42, 141, 142. However, the hinge connections 44a, 44b, 45a, 45b may be provided as any portion that enables folding, bending, or pivoting. For example, the hinge connections 44a, 44b, 45a, 45b may be provided by only a fold or crease in the material.

[0225] A closure system 2 suitable to be used as a fitment in a pouch 1 will be now described, referring to FIGS. 2A-2B, 5, 8C, 9A-9C and 10-11, 14, such closure system having two strips and a tongue-like contact part 55, 55 interacting with a measuring utensil 100.

[0226] The closure system 2 can have all the features that have been described above. However, the hold open arrangement and/or the specific way of implementing the interlocking area 10 are considered as options. For sake of conciseness and simplicity, additional description of the bag B will be not provided since the walls of the bag B can be typically as in the preceding part of the description. But the way the closure system 2 is connected to the upper end of the bag B is no way limited to the preceding examples when considering the following part of the description.

[0227] With regard to the measuring utensil 100 as illustrated in FIGS. 9A and 11, this is similar to a spoon in the embodiment shown, that is to say it has a cup 101 which defines a fixed measuring volume and is, in such option, substantially cylindrical up to the open side of this cup 101. A handle 102 extends from the cup 101 to a free end 102a. The measuring device 100 thus has an elongate form and is made of plastic material or equivalent material. The measuring utensil 100 is a measuring device of predetermined form, preferably designed to be sold with the whole pouch 1 and the fixed measuring volume of which is specific to the content 13 in question, here a food product.

[0228] When sold with the pouch 1, the measuring utensil may be initially wrapped in a base shown in FIG. 9a, inside the interior volume V or in a separated housing defined by the top portion 120 or in a bag fastened onto an outer surface of the bag B.

[0229] Using a predetermined measuring utensil 100 enables a coupling free edge 56 of a contact part 55 integrally formed with one of the strips 8 and 9 to be configured such that it engages tightly with a corresponding portion, here a rear slit 103 and/or the annular rim 14 of the cup 101, of the measuring utensil 100 that has a known and precise geometry.

[0230] Now referring to FIGS. 2A-2B and 11, it can be seen that each of the strip 8, 9 that are actuated to close the opening 7, directly or indirectly, can be provided with a tongue-like (but other shapes can be used) contact part 55 for interacting with a measuring utensil 100. The contact part 55 is arranged entirely below the interlocking area 10 and defines a leveling element not directly fastened to the inner face of the bag B. Here in FIG. 11, it can be seen that the contact part 55 may be provided with a recess or a central hole 50. Two arm portions 40a, 40b extend downwardly from a base portion 55a proximal with respect to the interlocking area 10 to an insert portion 55b provided with the rectilinear free edge 56. The insert portion 55b is configured to slide inside the rear slit 103 and, because of a clamping effect at the handle 102, the measuring utensil 100 is retained by the contact part 55.

[0231] Since the contact part 55 is defined as a lower extension protruding downwardly, the movement to connect the handle 102 is thus a short upward movement. The contact part 55 is made of strip material, typically as thin as the first strip 8,108, 208, 308, 408 and the second strip 9. Each of the opposite faces defined by the contact part 55 may be deprived from any relief. Accordingly, no powder can accumulate on such faces, which is of interest for having a correct connection of the insert portion 55b through the slit 103. Optionally some projections may be formed on one of the opposite faces, for example for guiding movement of the handle 102 during insertion of the insert portion 55b. Such optional projections may be distributed around the contact area between the handle 102 and the insert portion 55b.

[0232] Referring to FIGS. 9B-9C, the rear slit 103 may be defined between a main portion of the handle 102 and at least one clamping member 106, 107 that longitudinally extends between a connection part 106a, 107a and a free end 106b, 107b. The slit 103 is here not laterally delimited by left and right walls, in order to facilitate insertion of the insert portion 55b. The contact part 55 may be a protruding contact part that is connected to the edge 8d or 9d of the corresponding strip 8; 9. An interspace is defined between the inner face of the bag B and the contact part 55 so that a leveling can be performed by use of the free edge 56.

[0233] Regarding the rear slit 103, the term rear should not be interpreted in a strict manner (not necessarily having a rear orientation in the measuring utensil 100). It simply means that the slit 103 is arranged at or close the free end 102 of the measuring utensil 100. In a preferred embodiment as shown in FIG. 9D, the measuring utensil 100 can be of simple construction with the slit 103 opening forwardly and with a slit access provided on the same side as the open side of the cup 101. Such configuration can be obtained with a single longitudinal cut, substantially as wide or almost as wide as the handle 102. A clip element 110, here defined by a single elastic tongue, is defined because of the cut (but the cut may be significantly shorter than the clip element 110 to improve strength of the connection of the clip element 10). With such kind of rear slit 103, the hole 50 is required to define a passage for the clip element 110, when engaging the contact part 55 in the rear slit 103.

[0234] The clip element 110 may have a structure similar to a clip of pen cap and the insert portion 55b of the contact portion 55 may be engaged into the slot 103 by a consumer without placing fingers below the contact portion 55. Indeed, only the free end 102a will be touched by the consumer when storing the measuring utensil 100.

[0235] As shown in FIG. 10, leveling is performed by sliding the open side of the cup 101 of the measuring utensil 100 against the rectilinear free edge 56, thereby obtaining a volume of product in the measuring utensil 100 which corresponds very precisely to the volume of the cup 101. For this purpose, length of the rectilinear portion of the free edge 56 is at least equal to the open side of the cup 101. Else, if there were no rectilinear portion, for example if there were a concave free edge, the powder would not be leveled off correctly at the top of the open side, and what is worse, in the case of a convex free edge, the locally protruding rim thereof could catch on the cup 101 and cause powder to tip out. On the other hand, it is necessary for the free edge 56 to be sufficiently spaced from the bag sidewall of the bag B so that the user is not obliged to incline the measuring device 100 almost vertically which could cause some of the product to fall out and thereby lead to a mismeasurement. The interspace is here obtained because the material BM of the bag B is flexible and cannot stop the cup 101 when leveling is performed. The flexure of the bag B allows an angle ? to be locally formed behind the contact part 55, and the free edge 56 can thus be radially spaced with respect to the material BM of the bag B, while the base portion 55a remains along this sheet material BM.

[0236] When the contact part 55 defines a leveling element, it is understood that it can be configured as a tongue that cannot flex significantly, and typically that cannot be folded (without cracks or rupture). In the non-limiting depicted embodiments, because of memory effect of the semi rigid material forming the strip 8 or 9 provided with the contact part 55, the contact part can extend parallel to a plane defined by the interlocking area 10 in the closed configuration of the closure system 2, even after several leveling operations and repeated closures of the pouch 1.

[0237] Referring to FIGS. 2A-2B, it can be seen that extension L5 of the protruding contact part 55 is lower than height of the ends 8a, 8b, 9a, 9b of the strips. Such small extension, for example less than 20 mm and preferably less than 15 mm, is advantageous to perform the leveling sufficiently above the upper level 19 of the content 13 while having a pouch 1 sufficiently filled with the product.

[0238] Here, the contact part 55 defines a leveling element and an insertion edge for retaining the free end 102a of the handle 102. As shown in FIG. 11, the measuring utensil 100 is of shorter length than the determined height H of the interior volume V.

[0239] In order to immobilize the measuring utensil 100 when the handle 102 has been engaged in the insert portion 55b, one or more pressing members 59 or similar immobilizing members can engage directly the insert portion 55b when the insert portion 55b is in an engaged configuration within the rear slit 103. These members 59 are here arranged on an infer face of the clamping members 106, 107. The slit 103 thus can have an increased clamping action proximate the free end 102a, which is advantageous when the members 59 are engaged in the central hole 50 or similar recess. More generally, a clip function can be provided near the free end 102a of the handle 102 for retaining the insert portion 55b.

[0240] After taking the required quantity, the user attaches the measuring utensil 100 by engaging the contact part 55 in the slit 103, so that the contact part 55 then forms a holding part. In a gusset pouch 1, the maximum of spacing between the two strips of the closure system 2 is defined in a median plane between the junctions 6a, 6b. Accordingly, it is of interest of having a contact part 55 that intersect such virtual median plane P5 (FIGS. 8C and 12 show such media plane P5).

[0241] In some options advantageous to reduce amount of plastic in the strip 8 or 9, the contact part 55 has a length (large size thereof) typically strictly lower than one third of length of the interlocking area 10, preferably lower than one quarter of length of the interlocking area 10. In preferred embodiments, the length of the contact part 55, here measured at the junction 55a, may be strictly lower than 50 mm and the rectilinear continuos portion of the free edge 56 is typically comprised between 15 mm and 40 mm.

[0242] The open side of the cup 101 is oriented toward the bottom 3. The measuring utensil 100 is then held in position, here a longitudinal position, and immobilized in this position after the pouch 1 has been closed by fastening the strips 8, 9 each other or suing any suitable closure system 2 suitable for this kind of flexible package. Should the pouch 1 be handled energetically in a closed state, immobilization of the measuring utensil 100 by the insert portion 55b can be sufficient to prevent the measuring utensil 100 from falling into the content 13.

[0243] When the pouch 1 is used the next time, the measuring utensil 100 is immediately visible and can be withdrawn very easily if the handle 102 is adjacent to the opening 7 and orientation of the measuring utensil 100 is already a vertical orientation.

[0244] Of course, the content of the pouch 1 could also be retrieved with a standard teaspoon or tablespoon, but no user-friendly retaining of the spoon would be obtained and advantages of a longitudinal storage position of the measuring utensil 100 would be lost.

[0245] In some options, the contact part 55 formed on a first strip 8 or 9 can only be shaped as retaining means for holding a predetermined measuring utensil 100 and either a tongue-like leveling element is provided on the other strip 8 or 9, or no leveling element is provided. In other options, no rear slit 103 is provided in the measuring utensil 100 but a hook-like projection is formed proximate the free end 102a, allowing retaining of the measuring utensil 100 in a same longitudinal storage position (same general position as shown in FIG. 11) when the projection is engaged in the central hole 50 or similar recess defined by one of the strips 8, 9 of the pouch 1.

[0246] In one option, the tongue-like contact part 55 is provided as separated element that can be fastened to one of the strips 8, 9, below the interlocking area. Such tongue can for example be wrapped in the same bag where the measuring utensil 100 is initially housed.

[0247] Now referring to FIG. 14, it can be seen that the protruding contact part 55 can also be provided with two tongue like members, separated by a slot 75, and integrally formed with the main flexible part 28. In the measuring utensil 100, at the end 102a of the handle 102, the slit 103 may be replaced by at least one kerf or similar groove, for example two opposite side grooves, and/or one or more sliding projections 103a, 103b (here rib like projections). Such projections 103a, 103b may be used to cooperate with the edges of the slot 75. The front end of each projection 103a or 103b, which is the first to be in contact with the contact part 55 when placing and storing the measuring utensil 100, may be provided with small ribs R1, R2 or similar relief elastically engaged at the locally wider rear end of the slot 75. A snap fitting is thus provided in such option. Of course, one or more pressing members 59 such as shown in the embodiment of FIG. 9C may be used to produce a snap at the end of placing the handle 102.

[0248] Two holes 50 are here optionally provided for facilitating the curving of the main flexible part 8 when the pouch 1 has to be open. While two free edges 56a, 56b are shown in FIG. 14 for allowing a leveling, such free edges 56a, 56b of significant size (with a rectilinear portion as in most of the other preceding embodiments) can be partly or entirely replaced by narrow tongues.

[0249] It should be noted that in that case the leveling element is produced, in the same way as one of the strips, from extruding plastic, this enables geometric forms which are rather precise. This can provide good adaptability to the geometry of the measuring utensil 100, especially if the latter does not have a well-known predetermined form.

[0250] Of course, the embodiments described above are in no way limiting, their features can be combined and other variants are conceivable. It is in particular possible to produce another kind of fixation in the closure system 2, not necessarily with an interlocking area 10 such as shown in the figures. For instance, as an additional feature or substitution feature, at least one of the pull members 16, 18 could be provided with a fixation element to maintain the closure system 2 in the first flat configuration.

[0251] In some embodiments, the closure system 2 may be of a different kind with the two locking tabs 41, 42 removed (with or without equivalent feature to hold open the pouch 1), for example when only having the contact part 55, 55.

[0252] The terms rear and front are used, only for purpose of the description, to define relative positions of the main flexible panels of the bag B. However, it is understood that these terms are relative and the terms rear and front may be inverted, depending of the context. Accordingly, it is understood that the wall 5 could be called front wall and the wall 4 could be called rear wall.

[0253] The single opening 7 is preferably as wide as the bottom 3 for a closed pouch 1, as shown in the depicted embodiments. But in some constructions, the opening 7 may be shaped and sized differently. For instance, a tapered part or similar transition section may be provided in the bag B.

[0254] Besides, while the two strips 8 and 9 have been described as two pieces of semi rigid plastic material, options with a single annular piece of semi rigid plastic material or with at least three interconnected pieces of semi rigid plastic material are not excluded. Of course, the section or assembly parts fixed to the front wall 4 have to be considered as defining the first strip 8, while the section or assembly parts fixed to the rear wall 5 have to be considered as defining the second strip 9.

[0255] While the bag B can advantageously have a front wall 4 and a rear wall 5 in a flat configuration when the interior volume V is empty, in the first configuration of the closure system 2, one can form another kind of bag, for example with additional panels (for instance in order to define an assembly of two front panels functionally similar to the front wall 4 depicted in the figures) or one or more intermediate walls defining all or part of the longitudinal junctions 6a, 6b. More generally, it will be obvious that the use of the verb to comprise and its conjugations does not exclude the presence of any other elements besides those defined in any claim.

[0256] The word a or an preceding an element does not exclude the presence of a plurality of such elements. Any reference sign in the following claims should not be construed as limiting the claim.