BOX MADE OF PAPER MATERIAL WITH A LID AND BLANK FOR MAKING A BOX MADE OF PAPER MATERIAL WITH A LID

Abstract

A box made of paper material with a lid including a containment body having a base wall, a plurality of containment side walls, an access opening defining a containment space, a lid including a top wall and a plurality of lid side walls. At two non-adjacent containment side walls first portions of a retention device are present and two non-adjacent lid side walls having second portions of the retention device. When the lid is closed, each first portion and respective second portion of the retention device are commutable between a stable mutually engaged condition and an unstable mutually disengaged condition, wherein the stable mutual engagement condition is obtained by interference between each first portion and the respective second portion of the retention device. A rib is placed inside the containment space and placed between the base wall and the access opening.

Claims

1. A box made of paper material with a lid, comprising: a containment body having a base wall of polygonal shape and a plurality of containment side walls extending substantially parallel to each other from the base wall up to an access opening for the containment body and defining, in combination with the base wall, a containment space; the lid comprising a top wall and a plurality of lid side walls; wherein first portions of a retention device are provided at two non-adjacent containment side walls and wherein two non-adjacent lid side walls comprise second portions of said retention device; wherein when the lid is closed on the containment body, each first portion of the retention device and the respective second portion of the retention device are commutable between a stable mutually engaged condition in which they oppose the opening of the lid and an unstable mutually disengaged condition in which they allow the opening of the lid; wherein the stable mutual engagement condition is obtained by interference between each first portion of the retention device and the respective second portion of the retention device; said containment body further comprising a rib placed inside said containment space, connected to said containment side walls and placed between the base wall and the access opening.

2. The box according to claim 1, wherein said lid is hinged to one of said containment side walls interposed between the containment side walls on which the first portions of the retention device are active.

3. The box according to claim 1, wherein said rib is placed closer to the access opening with respect to the base wall.

4. The box according to claim 1, wherein said rib comprises a frame connected to said containment side walls and a central door at least partially separable from said frame.

5. The box according to claim 4, wherein said central door is connected to said frame through predefined separation lines to achieve a controlled and predefined separation of the central door from the frame.

6. The box according to claim 4, wherein said central door is smaller than said access opening.

7. The box according to claim 1, wherein each first portion of the retention device and the respective second portion of the retention device interfere with each other to define the stable mutual engagement condition at respective interference zones (Z1) provided at a first distance (D1) from said access opening and interposed between the base wall and the access opening; said rib being provided at a second distance (D2) from said access opening, wherein said second distance (D2) is less than three times said first distance (D1), preferably less than twice said first distance (D1), even more preferably less than said first distance (D1).

8. The box according to claim 1, wherein said first portions of the retention device extend from containment side walls adjacent to a containment side wall to which said lid is hinged.

9. The box according to claim 1, wherein each first portion of the retention device comprises an appendage projecting externally from the containment space at a containment side wall and wherein each second portion of the retention device comprises a shoulder on a lid side wall on the side facing the containment space.

10. The box according to claim 9, wherein each appendage extends from a free edge of a respective containment side wall and wherein each shoulder is obtained from a turned-up portion of a lid side wall.

11. The box according to claim 9, wherein each appendage comprises an abutment edge configured to engage said shoulder and a manoeuvring portion for a user configured to disengage the abutment edge from said shoulder.

12. The box according to claim 1, wherein said retention device comprises third portions and fourth portions operating on a containment side wall and a lid side wall, respectively; said third portions and said fourth portions of the retention device being commutable between a mutually engaged condition in which they oppose the opening of the lid and a mutually disengaged condition in which they allow opening the lid.

13. The box according to claim 12, wherein said third portions of the retention device operate on a different containment side wall than the containment side walls on which the first portions of the retention device operate, and said fourth portions of the retention device are placed on a different lid side wall than the lid side walls on which the second portions of the retention device are obtained.

14. The box according to claim 12, wherein said third portions of the retention device operate on a containment side wall opposite the containment side wall hinged to the lid.

15. The box according to claim 12, wherein each third portion of the retention device comprises a flap projecting externally to the containment space from a containment side wall and wherein each fourth portion of the retention device comprises a shoulder on a lid side wall on the side facing the containment space.

16. The box according to claim 15, wherein each flap comprises an abutment edge configured to engage said shoulder.

17. The box according to claim 1, wherein said box is made entirely of paper material starting from a flat blank.

18. A flat blank for making a box with lid comprising: a first panel, a second panel and a third panel adjacent to the first panel and placed on opposite sides with respect to the first panel; a fourth panel adjacent to the third panel on the opposite side with respect to the first panel; a fifth panel and a sixth panel adjacent to the first panel and placed on opposite sides with respect to the first panel; wherein the first panel realizes a base wall of a containment body, the second panel, the third panel, the fifth panel and the sixth panel realize containment side walls of the containment body and wherein the fourth panel defines a rib placed inside the containment body; wherein the fifth panel and the sixth panel comprise respective first appendages defining first portions of a retention device configured to cooperate with second portions of the retention device placed on a lid to hold said lid closed on the containment body.

19. The blank according to claim 18, comprising a seventh panel adjacent to the second panel on the opposite side with respect to the first panel, wherein the seventh panel realizes said lid and wherein the seventh panel comprises appendages defining said second portions of the retention device.

20. The blank according to claim 18, wherein the fourth panel comprises a central door and a frame connected by a separation line.

21. The blank according to claim 18, wherein the fourth panel comprises at least one edging configured to be joined to the second panel, the fifth panel and the sixth panel, respectively, to hold said rib in place.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0102] Further characteristics and advantages of the present invention will become clearer from the following detailed description of a preferred embodiment thereof, with reference to the appended drawings and provided by way of indicative and non-limiting example, in which:

[0103] FIG. 1 is a perspective view of a box made of paper material with a lid in accordance with the present invention in a closed lid condition;

[0104] FIG. 2A is a perspective view of the box of FIG. 1 in an open lid condition;

[0105] FIG. 2B is a perspective view of the box of FIG. 2A with a portion removed;

[0106] FIG. 3 is a sectional view according to plane III-III of some details of the box of FIG. 1;

[0107] FIG. 4 is a sectional view according to plane IV-IV of some details of the box of FIG. 1;

[0108] FIG. 5A is a sectional view according to plane V-V of some details of the box of FIGS. 1; and

[0109] FIG. 5B is a sectional view according to plane V-V of the box of FIG. 1;

[0110] FIG. 6 depicts a blank for making a box made of paper material with a lid in accordance with the present invention.

DETAILED DESCRIPTION

[0111] A box made of paper material with a lid in accordance with the present invention has been indicated as a whole with the reference number 10.

[0112] The box 10 comprises a containment body 11 and a lid 12 both made of paper material and preferably obtained from a single flat blank.

[0113] The containment wall 11 is a box-shaped element comprising, in the illustrated embodiment, four containment side walls 13 and a base wall 14.

[0114] The containment side walls 13 extend from the base wall 14 up to an access opening 16 (illustrated in FIG. 2A) to define a containment space 17 of the containment body 11 (illustrated in FIG. 2B). The access opening 16 is delimited by free edges 13d of the containment side walls 13.

[0115] The containment space 17 is accessible through the access opening 16 and is configured to contain preferably loose articles such as pods (detergent capsules).

[0116] Among the four containment side walls 13 it is possible to identify a front containment side wall 13a, a rear containment side wall 13b, opposite the front containment side wall 13a, and two transverse containment side walls 13c, which extend between the front 13a and the rear 13b containment side wall.

[0117] All containment side walls 13 have the same height, i.e. they extend equally from the base wall 14 to the access opening 16.

[0118] The front containment side wall 13a and the rear containment side wall 13b have, in the embodiment illustrated in the accompanying figures, the same width, i.e. they extend equally between the transverse containment side walls 13c.

[0119] The transverse containment side walls 13c have, in the embodiment illustrated in the accompanying figures, the same width, i.e. they extend equally between the front containment side wall 13a and the rear containment side wall 13b.

[0120] The width of the front containment side wall 13a is greater than the width of the transverse containment side walls 13c.

[0121] In other embodiments not illustrated, the number of containment side walls 11 may be greater than four, for example eight.

[0122] The lid 12 comprises a top wall 18 and three lid side walls 19.

[0123] Among the three lid side walls 19 it is possible to identify a front lid side wall 19a and two transverse lid side walls 19b, which extend transversely to the front lid side wall 19a.

[0124] All lid side walls 19 have the same height, i.e. they extend equally away from the top wall 18.

[0125] The transverse lid side wall 19b have, in the embodiment illustrated in the accompanying figures, the same width, i.e. they extend equally from the front lid side wall 19a.

[0126] The width of the front lid side wall 19a is greater than the width of the transverse lid side wall 19b.

[0127] In other embodiments not illustrated, the number of containment side walls 11 may be greater than three, for example seven.

[0128] In any embodiment of the present invention, the number of containment side walls 13 is equal to the number of lid side walls 19 increased by one.

[0129] The corners that are realized between the base wall 14 and the containment side walls 13 are obtained from respective folding lines of a single sheet or blank, and the corners that are realized between the containment side walls 13 are surmounted by strips 20 which extend from two opposite containment side walls 13.

[0130] This configuration allows the elimination of junction lines between the containment side walls 13 and between the containment side walls 13 and the base wall 14.

[0131] In other words, the corners of the containment body 11 that are realized between the containment side walls 13 and between the containment side walls 13 and the base wall 14 are all realized by folds in the paper material that realizes the containment body or are surmounted by said strips 20.

[0132] In the embodiment illustrated in the accompanying figures, the front containment side wall 13a and the rear containment side wall 13b are surmounted, on the opposite side with respect to the containment space 17, by said strips 20 that extend from the transverse containment side walls 13c. Such flaps 20 are joined, for example by gluing, to the front containment side wall 13a and to the rear containment side wall 13b by surmounting the corners between the transverse containment side walls 13c, the rear containment side wall 13b and the front containment side wall 13a.

[0133] The lid 12 is hinged to the containment body 11 so that it can be opened and closed by folding over the access opening 16.

[0134] The lid 12 is hinged to a containment side wall 13 of the containment body 11. Preferably, the top wall 18 of the lid 12 is hinged to a containment side wall 13 of the containment body 11. In the illustrated example, the top wall 18 of the lid 12 is hinged to the rear containment side wall 13b.

[0135] When the lid 12 is closed, the lid side walls 19 surmount respective containment side walls 13 of the containment body 11.

[0136] A hinge line 21 between the lid 12 and the containment body 11 extends over the entire width of the containment side wall 13 to which the lid 12 is hinged 11.

[0137] Said hinge line 21 is a folding line of a same sheet or panel that realizes both the containment side wall 13 to which the lid 12 is hinged and the top wall 18 of the lid 12.

[0138] The box 10 comprises a retention device 22 configured to hold the lid 12 in the closed position on the containment body 11.

[0139] The retention device 22 comprises first portions 23 and second portions 24 which are commutable between a stable mutually engaged condition in which they oppose the opening of the lid 12 and an unstable mutually disengaged condition in which they allow the opening of the lid 12.

[0140] In the preferred embodiment of the invention, the first portions 23 are two in number as two in number are the second portions 24. Each first portion 23 corresponds to a second portion 24.

[0141] Each first portion 23 comprises an appendage 25 placed outside the containment space 17 in the vicinity of the access opening 16. Each appendage 25 comprises an abutment edge 26 and a manoeuvring portion 27.

[0142] As illustrated in FIG. 2A, the manoeuvring portion 27 is closer to the base wall 14 with respect to the abutment edge 26. In particular, when the lid 12 is closed on the containment body 11, the manoeuvring portion 27 is not covered by the lid 12 while the abutment edge 26 is surmounted by the lid 12, preferably it is surmounted by a lid side wall 19.

[0143] The two appendages 25 are hinged to the containment body 11 at two respective opposite containment side walls 13, in the illustrated example a first appendage 25 is hinged at a first transverse containment side wall 13c and a second appendage 25 is hinged at a second transverse containment side wall 13c.

[0144] In particular, the two appendages 25 are hinged to the containment body 11 at the free edges 13d of the respective containment side walls 13 opposite the base wall 14. Each appendage 25 is free to rotate about a hinge axis A1 (FIG. 2A) perpendicular to the hinge line 21 between lid 12 and containment body 11. The hinge axes A1 are parallel to each other and coplanar and preferably coplanar with the hinge line 21.

[0145] Each second portion 24 comprises a shoulder 28 placed inside the lid 12 and facing the containment body 11 when the lid is closed.

[0146] The two shoulders 28 are placed on opposite lid side walls 19, in the illustrated example a first shoulder 28 is placed on a first transverse lid side wall 19b and a second should 28 is placed on a second transverse lid side wall 19b.

[0147] The shoulders 28 are obtained from flaps or panels that are folded and preferably glued to the lid side wall 19.

[0148] When the lid 12 is closed on the containment body 11, the abutment edges 26 of the appendages 25 abut on the shoulders 28 in respective interference zones Z1, as illustrated in FIG. 4. In this condition, which realizes the stable mutual engagement condition of the first 23 and second portions 25 of the retention device 22, the interference between the shoulders 28 and the abutment edges 26 prevents a free rotation of the lid 12 holding it on the containment body 11.

[0149] In order to achieve this condition, when the lid 12 is rotated closed on the containment body 11, the appendages 25 are forced to rotate about the hinge axes A1 arranging themselves parallel to the respective containment side walls 13. The rotation of the appendages 25 is actuated by the lid side wall 19 which intercept the appendages 25 causing them to rotate.

[0150] While continuing to rotate the lid 12 into the closed position, the appendages 25 remain interposed between the respective containment side walls 13 and the lid side walls 19, until the shoulders 28 go beyond the abutment edges 26 of the appendages 25 thus coming into abutment thereon (as shown in FIG. 2B).

[0151] When the lid 12 is closed, by exerting a manoeuvring force on each manoeuvring portion 27 of the appendages 25 directed towards the containment space 17, the yieldability of the paper material with which the box 10 is made allows a further (albeit minimal) rotation of the appendages 25 towards the containment space 17. This rotation of the appendages 25 releases the abutment edges 26 from the respective shoulders 28.

[0152] It should be noted that this further rotation of the appendages 25 can only be actuated when the aforementioned manoeuvring force is applied to each manoeuvring portion 27, since upon cessation of the manoeuvring force the elastic return of the appendages 25 results in a rotation of the appendages in the opposite direction, bringing the abutment edges 26 back into abutment with the respective shoulders 28. This results in an instability of the release action between the abutment edges 26 and the relative shoulders 28 that realizes the aforementioned unstable condition of mutual disengagement of the first portions 23 and the second portions 24 of the retention device 22.

[0153] Therefore, in order to be able to open the lid 12, it is necessary to exert a manoeuvring force simultaneously on the manoeuvring portions 27 of both appendages 25 and to continue to exert such a manoeuvring force while the lid 12 is being rotated with respect to the containment body 11. This allows making the opening of the lid 12 difficult for a child or an infant.

[0154] The retention device 22 further comprises third portions 29 and fourth portions 30 placed on a containment side wall 13 and on a lid side wall 19, respectively.

[0155] The third portions 29 and the fourth portions 30 have the function of preventing movements of the lid 12 with respect to the containment body 11 when the lid 12 is closed, so as to prevent the first portions 23 and the second portions 24 from being able to accidentally disengage from each other. The third portions 29 and the fourth portions 30 are commutable between a mutually engaged condition in which they oppose the opening of the lid 12 and a mutually disengaged condition in which they allow opening the lid 12.

[0156] In the preferred embodiment of the invention, the third portions 29 are two in number as two in number are the fourth portions 30. Each third portion 29 corresponds to a fourth portion 30.

[0157] The third portions 29 comprise respective flaps 31 projecting externally to the containment space 17. Each flap 31 comprises an abutment edge 33.

[0158] The two flaps 31 are hinged to the containment body 11 at a same containment side wall 13 not affected by the first portions 23 of the retention device 22. The two flaps 31 are spaced apart from each other. In the illustrated example, the two flaps are hinged at the front containment side wall 13a.

[0159] In particular, the two flaps 31 are hinged to the containment body 11 at a free edge 13d of the containment side wall 13 opposite the base wall 14. Each flap 13 is free to rotate about an axis of rotation A2 (FIG. 2A) parallel to the hinge line 21 between lid 12 and containment body 11. The axes of rotation A2 are parallel to each other and coincident and preferably coplanar with the hinge line 21.

[0160] Each fourth portion 30 comprises a shoulder 32 placed inside the lid 12 and facing the containment body 11 when the lid is closed.

[0161] The two shoulders 32 are placed on a same lid side wall 19 not affected by the second portions 24 of the retention device 22. In the illustrated example, the two shoulders 32 are placed on the frontal lid side wall 19a.

[0162] The shoulders 32 are obtained from flaps or panels that are folded and preferably glued to the lid side wall 19.

[0163] When the lid 12 is closed on the containment body 11, the abutment edges 33 of the flaps 31 abut on the shoulders 32 in respective interference zones Z2, as illustrated in FIG. 5A. In this condition, which realizes the mutual engagement condition of the third 29 and fourth portions 30 of the retention device 22, the interference between the shoulders 32 and the abutment edges 33 prevents a free rotation of the lid 12 holding it on the containment body 11.

[0164] In order to achieve this condition, when the lid 12 is rotated closed on the containment body 11, the flaps 31 are forced to rotate about the hinge axes A2 arranging themselves parallel to the respective containment side walls 13. The rotation of the flaps 31 is actuated by the side lid wall 19 (in the figures by the frontal lid side wall 19a) which intercepts the flaps 31 causing them to rotate.

[0165] While continuing to rotate the lid 12 into the closed position, the flaps 31 remain interposed between the containment side wall 13 and the lid side wall 19, until the shoulders 32 go beyond the abutment edges 33 of the flaps 31 thus coming into abutment thereon (as shown in FIG. 5A).

[0166] When the lid 12 is closed, by exerting an opening force on the lid 12, the yieldability of the paper material with which the box 10 is made allows the flaps 31 to deform, releasing the abutment edges 33 from the respective shoulders 28.

[0167] For this purpose, the size of the flaps 31 measured in the direction perpendicular to the axes of rotation A2 is smaller than the size of the appendages 25 measured in the same direction.

[0168] The distance between the abutment edge 33 of a flap 31 and the respective axis of rotation A2 is less than the distance between the abutment edge 26 of an appendage and the respective hinge axis A1.

[0169] Preferably, the distance between the abutment edge 33 of a flap 31 and the respective axis of rotation A2 is about half the distance between the abutment edge 26 of an appendage and the respective hinge axis A1.

[0170] The box 10 further comprises a rib 40 placed inside the containment space 11 and stably connected to the side containment walls 13.

[0171] The rib 40 has two much larger development dimensions than the third direction of development. In other words, the rib 40 is shaped like a panel, a plate or a foil.

[0172] The rib 40 is parallel to the base wall 14 and is interposed between the base wall 14 and the free edges 13d of the containment side walls 13.

[0173] As shown in FIG. 5B, the interference zones Z1 of the first portions 23 and the second portions 24 of the retention device 22 are provided at a first distance D1 from the free edges 13d of the containment walls 13.

[0174] The rib 40 is provided at a second distance D2 from the free edges 13d of the containment walls 13.

[0175] The base wall 14 is provided at a third distance D3 from the free edges 13d of the containment walls 13.

[0176] The first distance D1, the second distance D2 and the third distance D3 are measured in a direction perpendicular to the base wall 14.

[0177] The first distance D1 and the second distance D2 are smaller than the third distance D3. The second distance D2 is smaller than the first distance D1. In other words, the rib 40 is placed closer to the free edges 13d of the containment walls 13 with respect to the base wall 14. The rib 40 is closer to the free edges 13d of the containment walls 13 with respect to the interference zones Z1.

[0178] The second distance D2 is between zero and one half of the third distance D3, preferably between zero and one third of the third distance D3, more preferably between zero and one fifth of the third distance D3.

[0179] The first distance D1 is between one twentieth of the third distance D3 and one half of the third distance D3, preferably between one twentieth of the third distance D3 and one third of the third distance D3, more preferably between one fifteenth and one fifth of the third distance D3.

[0180] The function of the rib 40 is to stiffen the containment body 11 at the interference zones Z1 of the first portions 23 and the second portions 24 of the retention device 22, so as to prevent the first portions 23 and the second portions 24 from being able to accidentally disengage due to an impact or a manipulation of the box 10.

[0181] The rib 40 is connected, e.g. by gluing, to the containment side walls 13. For this purpose, there are provided edgings 41 (FIG. 3), preferably integral with the rib 40, folded substantially at right angles with respect to the rib 40 and arranged parallel to the containment side walls 13. These edgings are glued to the containment side walls 13 in such a way as to stably constrain the rib inside the containment space 16.

[0182] The rib 40 comprises a frame 42 connected to all the containment side walls 13, preferably through edgings 41, which is immovable with respect to the containment side walls 13.

[0183] The rib 40 further comprises a central door 43 (FIG. 2A) which can be removed either totally (as illustrated in FIG. 2B) or only partially to create a passage opening and allow access to the containment space 17.

[0184] The central door 43 is placed centrally in the rib 40 and is completely surrounded by the frame 42. The central door 43 is connected to the frame by continuous separation lines 44 which facilitate the removal thereof from the frame 42. The central door 43 is provided with a tab 45 to facilitate its gripping during the separation from the frame 42.

[0185] The size of the central door 43 is smaller than the size of the access opening 17 as it is completely surrounded by the frame 42.

[0186] The box 10 is obtained starting from a single flat blank 100 made of paper material.

[0187] The blank 100 (illustrated in FIG. 6) comprises a plurality of panels separated from each other by folding lines.

[0188] A first panel 101 defines the base wall 14 of the containment body 11. A second panel 102 defines a containment side wall 13 which, in the illustrated example, is the rear containment side wall 13b. A third panel 103 defines a containment side wall 13 which, in the illustrated example, is the front containment side wall 13a. The first panel 101 is interposed between the second panel 102 and the third panel 103.

[0189] A fourth panel 104 defines the rib 40. The fourth panel 104 is placed side by side to the third panel 103 on the opposite side with respect to the first panel 101. The fourth panel 104 comprises the central door 43 and the frame 42 connected to each other by the separation line 44. The fourth panel 104 further comprises four flaps 104a defining the edgings 41 that constrain the rib 40 to the containment side walls 13. The four flaps 104a are placed on the outer periphery of the fourth panel 104 with internally the frame 42 which in turn surrounds the central door 43.

[0190] The blank 100 further comprises a fifth panel 105 that realizes a containment side wall 13 which, in the illustrated example, is a transverse containment side wall 13c. A sixth panel 106 realizes a containment side wall 13 which, in the illustrated example, is a transverse containment side wall 13c.

[0191] The fifth panel 105 comprises two side portions 105a that are opposed to one another between which a central portion 105b is arranged. The two side portions 105a realize two respective strips 20 that surmount the front containment side wall 13a and the rear containment side wall 13b. The central portion 105b defines a transverse containment side wall 13c.

[0192] The sixth panel 106 comprises two side portions 106a that are opposed to one another between which a central portion 106b is arranged. The two side portions 106a realize two respective strips 20 that surmount the front containment side wall 13a and the rear containment side wall 13b. The central portion 106b defines a transverse containment side wall 13c.

[0193] The fifth panel 105 is adjacent to the first panel 101, second panel 102 and third panel 103. The sixth panel 106 is adjacent to the first panel 101, second panel 102 and third panel 103 on the opposite side with respect to the fifth panel 105.

[0194] The fifth panel 105 comprises a first appendage 105c that defines one of the two first portions 23 of the retention device 22. The first appendage 105c is placed at the central portion 105b of the fifth panel 105.

[0195] The sixth panel 106 comprises a first appendage 106c that defines the other first portion 23 of the retention device 22. The first appendage 106c is placed at the central portion 106b of the sixth panel 106.

[0196] The fifth panel 105 further comprises a second appendage 105d that defines one of the two third portions 29 of the retention device 22. The second appendage 105d is placed at one of the side portions 105a of the fifth panel 105.

[0197] The sixth panel 106 further comprises a second appendage 106d that defines the other of the two third portions 29 of the retention device 22. The second appendage 106d is placed at one of the side portions 106a of the sixth panel 106.

[0198] The blank 100 further comprises a seventh panel 107 which realizes the lid 12. The seventh panel 107 is adjacent to the second panel 102 on the opposite side with respect to the first panel 101.

[0199] The seventh panel 107 comprises a main portion 107a which realizes the top wall 18 of the lid 12 and two side portions 107b that are opposed to one another and realize two lid containment walls 19, in the illustrated example the transverse lid containment walls 19b. The main portion 107a is placed between the two side portions 107b. An outer portion 107c of the seventh panel 107 realizes a lid containment wall 19, in the illustrated example the frontal lid containment wall 19a.

[0200] The seventh panel further comprises two appendages 107d that realizes the second portions 24 of the retention device 22. The two appendages 107c are configured to be folded and glued to the two side portions 107b. A turned-up portion 107e which realizes the fourth portions 30 of the retention device 22 is interposed between the two appendages 107c. The turned-up portion 107e is configured to be folded and glued to the outer portion 107c.

[0201] The blank 100 is made entirely of paper material and is in one piece, i.e. it consists of a single sheet. The blank 100 may be coated, on one face only or on both faces, with an impermeable or semi-impermeable film, so as to make the box 12 and the lid 12 impermeable or semi-impermeable.

[0202] Preferably, the film is made of a thermo-adhesive plastic material in order to be stably applied on the blank 100.

[0203] Obviously, a person skilled in the art, in order to satisfy specific and contingent needs, can make numerous modifications and variations to the invention described above while remaining within the scope of protection defined by the following claims.