Packaging Container

Abstract

This packaging container has a packaging bag formed of a packaging film having a sealant in an innermost layer, and a spout or a discharge port opening member sealed to the packaging bag. The packaging bag has a heat-resistant coating layer that includes a region superposed on the spout or the discharge port opening member via at least the sealant and is formed partially with respect to an area of the packaging film.

Claims

1. A packaging container comprising: a packaging bag formed of a packaging film including a sealant in an innermost layer thereof, and a spout or a discharge port opening member sealed to the packaging bag, wherein the packaging bag includes a heat-resistant coating layer that includes a region superposed on the spout or the discharge port opening member via at least the sealant and is formed partially with respect to an area of the packaging film.

2. The packaging container according to claim 1, wherein the heat-resistant coating layer is formed in an outermost layer on a side opposite to the sealant in a thickness direction of the packaging film.

3. The packaging container according to claim 1, wherein a base material of the packaging film, the sealant, and the spout or the discharge port opening member are all made of polyethylene-based resins.

4. The packaging container according to claim 1, wherein the heat-resistant coating layer is made of a curable resin.

5. The packaging container according to claim 1, wherein the heat-resistant coating layer is made of a resin having a higher melting point than a base material of the packaging film.

6. The packaging container according to claim 1, wherein the packaging bag is a standing pouch.

7. The packaging container according to claim 1, wherein the packaging bag is configured to contain a liquid.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a side cross-sectional view showing a seal portion of a spout relative to a packaging bag in a packaging container according to an embodiment of the present invention.

[0017] FIG. 2 is a front view showing a first example of the packaging container according to the embodiment.

[0018] FIG. 3 is a front view showing a second example of the packaging container according to the embodiment.

[0019] FIG. 4 is a partial front view showing a packaging container according to another embodiment of the present invention that has a discharge port opening member in a discharge port.

DETAILED DESCRIPTION OF THE INVENTION

[0020] A preferred embodiment of the present invention will be described below.

[0021] FIG. 1 is a side cross-sectional view showing a seal portion of a spout 10 relative to a packaging bag 20 in a packaging container according to an embodiment of the present invention. This seal portion is used in the packaging container having the spout 10 and the packaging bag 20. The spout 10 is sealed to the packaging bag 20. The packaging bag 20 has a heat-resistant coating layer 30 to include a region superposed on the spout 10.

[0022] The spout 10 in the illustrated example has a cylindrical tube portion 11 having an opening portion 14 serving as a discharge port at its tip (the upper end in the figure), and a base portion 12 that is integrally formed in a T-shape at a lower end of the tube portion 11 to form a boat-like shape with both its ends narrowing in a plan view, and the base portion 12 has a region superposed on the packaging bag 20. The tube portion 11 protrudes vertically from a center of the base portion 12. Both side surfaces of the base portion 12 form a rectangular shape, and both these side surfaces are superposed on an inner surface of a central portion of an upper end of the packaging bag 20 and are joined thereto by sealing. The heat-resistant coating layer 30 in this example is formed in a rectangular shape to correspond to a joint surface between the base portion 12 and the packaging bag 20. The heat-resistant coating layer 30 may be the same size as the joint surface between the base portion 12 and the packaging bag 20, or may be formed slightly larger than the joint surface in a left to right direction and downward in FIG. 2. However, the upper end of the packaging bag 20 preferably coincides with an upper end of the base portion 12, and an upper end of the heat-resistant coating layer 30 also coincides with the upper end of the base portion 12. A flow path 13 is formed inside the spout 10, through which the contents (not shown) contained in the packaging bag 20 can be poured out. The flow path 13 causes an inside of the packaging bag 20 to communicate with the opening portion 14.

[0023] The contents of the packaging bag 20 are not particularly limited, but are preferably a liquid, powder, granules, or other fluid materials. If the contents contain a liquid, they may be a mixture such as a solution, a dispersion, an emulsion, a suspension, or the like.

[0024] A shape of the tube portion 11 is not particularly limited in the present invention, and may be, for example, a cylindrical shape, an elliptical tube shape, a square tube shape, or the like. The base portion 12 may have a cross-sectional shape larger than that of the tube portion 11, or the base portion 12 may have the same cross-sectional shape as the tube portion 11. The cross-sectional shape of the base portion 12 is not particularly limited in the present invention, but may be, for example, a circular shape, an elliptical shape, or a boat shape on a plane perpendicular to a length direction of the flow path 13. Here, although not illustrated in particular, the boat shape is a shape in which two long axis directions protrude in approximately triangular shapes and two short axis directions are curved in approximately arc shapes.

[0025] A cross-sectional shape of the flow path 13 formed inside the spout 10 is not particularly limited in the present invention, but may be, for example, a circular shape, an elliptical shape, or a polygonal shape on the plane perpendicular to the length direction. An inner surface of the flow path 13 may be concentric with an outer surface of the tube portion 11. A shape of the flow path 13 in the length direction is not particularly limited in the present invention, but may be, for example, a straight line shape, a curved line shape, a curved shape, a bent shape, or the like. Although not particularly illustrated, two or more opening portions 14 may open while branching from the same flow path 13.

[0026] The spout 10 is an example of a member attached to the discharge port of the packaging bag 20. The spout 10 in the illustrated example has the tube portion 11 protruding outward from a region superposed on the packaging bag 20. As will be described in detail later, it is also possible to apply the heat-resistant coating layer 30 to the seal portion of the discharge port opening member disposed within a range of the region superposed on the packaging bag 20. In the following description, members that are accessories to the packaging bag 20, including the spout 10 and the discharge port opening member, may be referred to as accessories of the spout 10, or the like.

[0027] The packaging bag 20 is formed of a packaging film 23 having a sealant 21 in its innermost layer. The sealant 21 is usually laminated over the entire surface of the packaging film 23. When a plurality of packaging films 23 are superposed to form the packaging bag 20, the sealants 21 can be bonded to each other facing each other. The sealant 21 is preferably made of a weldable resin. For the weldable resin, polyolefin resins such as a polyethylene resin and a polypropylene resin may be exemplified, and for example, a polyethylene resin is preferably used.

[0028] Specific examples of a material for forming the sealant 21 include, for example, a linear low density polyethylene (LLDPE), a low density polyethylene (LDPE), and the like. The material for forming the sealant 21 may be one type of a polyethylene resin or a blend of two or more types of polyethylene resins. A thickness of the sealant 21 is not particularly limited, but may be, for example, about 60 to 180 m.

[0029] The packaging film 23 may have at least one layer of a base material 22 as a film different from the sealant 21. A material of the base material 22 is not particularly limited, but may be a polyolefin resin such as a polyethylene resin or a polypropylene resin, or may be a polyethylene resin. The base material 22 is preferably a heat-resistant material that does not melt under a temperature condition for welding the sealant 21, and is a resin film with a higher melting point than the sealant 21, for example.

[0030] Specific examples of the material for forming the base material 22 from a polyolefin-based resin include a linear low-density polyethylene (LLDPE), a low density polyethylene (LDPE), a medium density polyethylene (MDPE), a high density polyethylene (HDPE), polypropylene (PP), and the like. The base material 22 may include a stretched resin film. A thickness of the base material 22 is not particularly limited, but may be, for example, about 10 to 50 m for each layer thickness or total thickness.

[0031] The packaging film 23 may include a plurality of resin films, such as the sealant 21 and base material 22. To form a mono-material packaging bag 20, the resin films included in the packaging film 23 are preferably made of only a polyolefin-based resin, and more preferably only a polyethylene-based resin.

[0032] The plurality of resin films for forming the packaging film 23 may be laminated via adhesive layers by dry lamination or the like, or may be laminated by co-extrusion, heat lamination, or the like while omitting the adhesive layers. The resin films made of a polyethylene resin or the like may be laminated on another resin film by extrusion lamination, sand lamination, or the like. A printed layer, a vapor deposition layer, or the like may be formed on at least one side of each resin film.

[0033] The accessories such as the spout 10 are preferably made of a polyolefin resin such as a polyethylene resin or a polypropylene resin. A method for forming the accessories such as the spout 10 is not particularly limited, but injection molding or extrusion molding may be exemplified. The accessories such as the spout 10 can be formed by two-color molding, but from the perspective of cost, the accessories such as the spout 10 can be preferably formed using a single resin.

[0034] A method for bonding the accessories such as the spout 10 to the packaging bag 20 is sealing using the sealant 21. There are no particular restrictions on a sealing method, and examples thereof include hot plate sealing, ultrasonic sealing, high frequency sealing, impulse sealing, and the like. A melted or softened resin cools and solidifies to stabilize the bonding, and thus the bonding can be completed in a relatively short time. A cooling mold or the like may be brought into contact with a place at which the accessories such as the spout 10 are sealed to absorb excess heat.

[0035] The packaging bag 20 has the heat-resistant coating layer 30 that includes the region superposed on the accessories such as the spout 10 via at least the sealant 21. Thus, the shrinkage of the packaging film 23 can be inhibited when the accessories such as the spout 10 are sealed to the packaging bag 20. Further, a decrease in strength and deterioration in appearance of the packaging film 23, and a decrease in drop resistance of the packaging bag 20 can be inhibited.

[0036] In a thickness direction of the packaging film 23, the heat-resistant coating layer 30 is disposed at a position that does not interfere with the sealing of the accessories such as the spout 10 to the packaging bag 20. The heat-resistant coating layer 30 may be disposed between the sealant 21 and the base material 22, or may be the outermost layer on a side opposite to the sealant 21. A thickness of the heat-resistant coating layer 30 is not particularly limited, and may be, for example, within a range of 1 m to 1 mm, 5 to 50 m, or 10 to 30 m. The thickness of the heat-resistant coating layer 30 may be 0.5 to 20%, or 3 to 10% of a thickness of the packaging film 23. The thickness of the heat-resistant coating layer 30 is preferably appropriately thin in terms of transmitting the heat required for sealing to the accessories such as the spout 10, and is preferably appropriately thick in terms of inhibiting thermal shrinkage of the packaging film 23.

[0037] The heat-resistant coating layer 30 is formed partially with respect to an area of the packaging film 23. It is possible to form the heat-resistant coating layer 30 on the entire surface of the packaging film 23, but if an amount of the heat-resistant coating layer 30, which has a different melting point, material, or the like from the sealant 21 and the base material 22 of the packaging film 23, is large, a proportion of foreign matters in the mono-material packaging bag 20 increases, which is not preferable.

[0038] The range in which the heat-resistant coating layer 30 is formed with respect to the area of the packaging film 23 includes at least the region superposed on the accessories such as the spout 10. For example, the heat-resistant coating layer 30 is preferably formed in and around the region in which the base portion 12 of the spout 10 is interposed between the packaging films 23. The range in which the heat-resistant coating layer 30 is formed may extend from 0 mm or more to 50 mm or less in the left to right direction in FIG. 2 of the region in which the base portion 12 of the spout 10 is interposed between the packaging films 23, or may extend by about 3 to 10 mm. Also, the range in which the heat-resistant coating layer 30 is formed may extend downward in FIG. 2 from the region in which the base portion 12 of the spout 10 is interposed between the packaging films 23 by 0 mm or more and 50 mm or less, or by about 3 to 10 mm.

[0039] The heat-resistant coating layer 30 is preferably made of a material that is more heat-resistant and less heat-shrinkable than the packaging film 23. When the accessories such as the spout 10 are sealed to the packaging film 23, as compared to when the packaging films 23 are sealed together, a temperature tends to be higher or a time tends to be longer, and an amount of heat applied to the sealing portion tends to be larger. For this reason, under the conditions for sealing the accessories such as the spout 10, the heat-resistant coating layer 30 preferably has a smaller thermal shrinkage than the packaging film 23.

[0040] In a first aspect, the heat-resistant coating layer 30 is made of a curable resin. Examples of the curable resin include, for example, a thermosetting resin, an ultraviolet-curable resin, an electron beam-curable resin, and the like. A reactive curable resin that is cured by a chemical reaction is preferably used. The heat-resistant coating layer 30 can be formed by coating an outer surface of the packaging film 23 or the base material 22.

[0041] The curable resin used for the heat-resistant coating layer 30 of the first aspect is not particularly limited, but examples thereof include one or more of a urethane resin, an acrylic resin, an epoxy resin, a polymethylpentene resin, a cyclic olefin resin, an unsaturated polyester resin, an alkyd resin, a polyimide resin, a polyamideimide resin, a polyamide resin, and the like. The heat-resistant coating layer 30 may be formed by applying a coating agent such as varnish and then performing drying and curing.

[0042] The coating agent may contain a resin and a solvent, or may contain a solventless resin. The coating agent can be formed into the heat-resistant coating layer 30 directly without an adhesive layer or the like interposed between the coating agent and the base material 22. Application of the coating agent can also be performed by printing, inkjet, or the like.

[0043] A type of the coating agent is not particularly limited, but examples thereof include a one-liquid type in which a composition is supplied in a premixed state, and a two-liquid reaction type in which a main agent and additives are supplied separately and mixed at the time of use. The coating agent may be supplied in a concentrated state, or may be diluted at the time of use to obtain an appropriate concentration or viscosity. A solvent for the coating agent can be selected appropriately in consideration of the performance when applied. The coating agent may contain a curing agent that hardens a resin, a crosslinking agent, or the like.

[0044] In a second aspect, the heat-resistant coating layer 30 is made of a resin having a higher melting point than the base material 22 of the packaging film 23. Examples of the high-melting-point resin used for the heat-resistant coating layer 30 include polyethylene terephthalate (PET), nylon (Ny), polypropylene (PP), and the like. The high-melting-point resin may be a thermoplastic resin. The heat-resistant coating layer 30 preferably has a smaller heat shrinkage than the base material 22.

[0045] A melting point of the sealant 21 may be, for example, 100 to 115 C. A melting point of the base material 22 may be, for example, about 135 C. Melting points of the accessories such as the spout 10 may be, for example, 127 to 130 C. A heat sealing temperature of the accessories such as the spout 10 to the packaging film 23 is, for example, around 140 C. The heat-resistant coating layer 30 preferably has a melting point higher than the heat sealing temperature of the accessories such as the spout 10.

[0046] The present invention is not limited thereto, but a melting point of the heat-resistant coating layer 30 may be 30 to 150 C. higher than the melting point of the sealant 21, for example. The melting point of the heat-resistant coating layer 30 may be 10 to 130 C. higher than the melting point of the base material 22. The melting point of the heat-resistant coating layer 30 may be 160 to 260 C.

[0047] Specific examples of the packaging bag 20 include, but are not particularly limited to in the present invention, a three-sided sealed bag, a four-sided sealed bag, a pillow bag, a flat bag, a gusset bag, a standing pouch, and the like. FIGS. 2 and 3 show specific examples of packaging containers 31 and 32 using the standing pouch packaging bag 20. The packaging bag 20 used in the packaging containers 31 and 32 is formed by having a body member 24 made of a pair of packaging films 23, with a bottom member 26 interposed between them.

[0048] The bottom member 26 is folded in half and disposed under the body member 24. Above the bottom member 26, side seal portions 25 are formed on left and right sides, and front and rear portions of the body member 24 are joined to each other. The bottom member 26 and the body member 24 are joined by a bottom seal portion 27. One side of the bottom member 26 folded in half is joined to the front portion of the body member 24, and the other side of the bottom member 26 is joined to the rear portion of the body member 24. When the bottom member 26 is unfolded, the packaging bag 20 can stand on its own.

[0049] An upper seal portion 28 is formed in an upper portion of the body member 24. The spout 10 is sealed to a part of the upper seal portion 28. The front and rear portions of the body member 24 are joined to each other via the upper seal portion 28 at portions other than the spout 10.

[0050] The heat-resistant coating layer 30 may be formed in the region superposed on the base portion 12 of the spout 10, and may be formed around it on at least a part of the upper seal portion 28, or the like. Also, the heat-resistant coating layer 30 may be formed to extend over an unsealed portion in which the packaging film 23 is not sealed.

[0051] As shown in FIG. 2, in the case of the packaging container 31 of a first example, the upper seal portion 28 performs connection between left and right side seal portions 25, and the spout 10 is sealed upward in a central portion of the upper seal portion 28, sealing the inside of the packaging bag 20. The packaging bag 20 can be sealed by filling the contents through the spout 10 and then closing the spout 10 with a lid such as a cap (not shown).

[0052] As shown in FIG. 3, in the case of the packaging container 32 of a second example, an opening portion 29 configured of an unsealed portion is formed in the upper portion of the body member 24 in contact with one of the left and right side seal portions 25. A part of the upper seal portion 28 is formed obliquely, and the spout 10 is sealed obliquely. In the case of the packaging bag 20 having the opening portion 29, the contents can be filled into the packaging bag 20 through the opening portion 29 without opening the spout 10. In addition, after filling the packaging bag 20 with the contents, the packaging bag 20 can be sealed by joining the unsealed portion of the opening portion 29.

[0053] As shown in FIG. 4, a discharge port opening member 42 sealed to the inside of the packaging bag 20 can also be used for an accessory similar to the spout 10. A packaging container 40 in the illustrated example has a film-type discharge port 41 formed in the body member 24 of the packaging bag 20. The discharge port 41 may be formed in a shape that protrudes thinly from an upper portion or a corner portion of the packaging bag 20.

[0054] The discharge port 41 is configured of the pair of packaging films 23 that form the body member 24. The discharge port opening member 42 is sealed between the packaging films 23. The front and rear portions of the body member 24 are joined to each other by the seal portion that is continuous with the side seal portions 25 at an outer circumferential portion of the discharge port 41. The front and rear portions of the body member 24 are left unsealed inside the discharge port 41 to form a flow path. The discharge port opening member 42 is installed in the flow path of the discharge port 41.

[0055] A shape of the discharge port opening member 42 is not particularly limited, but examples thereof include a tubular shape with a circular, elliptical, or polygonal cross-section, a basket shape with a plurality of opening portions on a circumferential surface of a main body of the tubular shape, a ring shape formed by shortening the main body of the tubular shape in its axial direction, and the like. The discharge port opening member 42 in the illustrated example is a cylindrical straw with an axis extending from a lower right side to an upper left side, similar to the flow path of the discharge port 41.

[0056] The sealing may be performed between the discharge port opening member 42 and the body member 24, and the contents may be caused to flow only inside the discharge port opening member 42. The sealing may be partially performed between the discharge port opening member 42 and the body member 24, and the contents may be caused to flow between the discharge port opening member 42 and the body member 24.

[0057] A range in which the heat-resistant coating layer 30 is formed on the discharge port opening member 42 includes at least the region in which the packaging film 23 is superposed on the discharge port opening member 42. For example, the heat-resistant coating layer 30 is preferably formed in the region in which the discharge port opening member 42 is interposed between the packaging films 23 and therearound. A material, a thickness, and a dimension of the heat-resistant coating layer 30 may be the same as those in the first example.

[0058] The discharge port 41 formed of the body member 24 is opened by tearing the body member 24. In order to facilitate opening, the packaging film 23 may have a structure machined in the thickness direction, such as a perforation, a notch, a half-cut groove, or the like. In order to facilitate the opening of the discharge port 41, a cut such as a notch may be formed on an outer edge of the opening portion. When a cut is formed in the sealing portion that joins the body members 24 at the outer circumferential portion of the discharge port 41, a sealing property of the packaging bag 20 can be ensured.

[0059] Illustration of a lower portion of the packaging container 40 shown in FIG. 4 is omitted, but the packaging bag 20 can be made to stand on its own by interposing the bottom member 26 between the body members 24, as with the packaging containers 31 and 32 shown in FIGS. 2 and 3.

[0060] When the bottom member 26 is on the lower side, the spout 10 or the discharge port 41 is preferably installed to face upward or diagonally upward with respect to the packaging bag 20. Thus, even when the spout 10 or the discharge port 41 is opened, the contents do not leak from the spout 10 or the discharge port 41, and the packaging bag 20 can stand on its own. When the spout 10 or the discharge port 41 is oriented sideways, downward, or diagonally downward, the contents are poured out from the packaging bag 20.

[0061] In the packaging container 31 shown in FIG. 2, the spout 10 is installed to face upward. In the packaging container 32 shown in FIG. 3, the spout 10 is installed to face diagonally upward. In the packaging container 40 shown in FIG. 4, the discharge port 41 is installed to face diagonally upward. Although not specifically illustrated, it is also possible to install a film-type discharge port 41 to face upward.

[0062] Dimensions of the packaging bag 20 are not particularly limited, but for example, when used as a refill container, they may be exemplified such that a vertical height is about 100 to 500 mm, a horizontal width is about 70 to 300 mm, and a filling volume is about 100 cm3 to 5000 cm3. The contents may be in a state of a liquid, powder, granules, or other fluids, and the packaging bag 20 may be used to encapsulate a liquid. Examples of a type of the contents can be, but are not particularly limited, detergent, medicine, cosmetics, pharmaceuticals, beverages, seasonings, ink, paint, fuel, and the like.

[0063] When the packaging bag 20 is made from an elongated packaging film 23 and the accessories such as the spout 10 are sealed to manufacture the packaging containers 31, 32, and 40, the heat-resistant coating layer 30 is formed at the stage of the elongated packaging film 23. For example, a roll-shaped packaging film 23 is rolled out flat, the heat-resistant coating layer 30 is formed, and then a sealing step of the accessories such as the spout 10 and a sealing step of the packaging bag 20 are performed, whereby the packaging containers 31, 32, and 40 can be obtained.

[0064] After the heat-resistant coating layer 30 is formed on one side of the packaging film 23 rolled out flat, the packaging film 23 can also be rolled up again. It is also possible to manufacture the packaging containers 31, 32, and 40 without rolling up the packaging film 23 on which the heat-resistant coating layer 30 is formed while the packaging film 23 is rolled out flat.

[0065] Prior to the sealing step of the accessories such as the spout 10, a molded portion such as unevenness may be formed in the packaging film 23. Prior to the formation of the molded portion, the portion of the packaging film 23 that will become the molded portion may be preheated. Further, the packaging film 23 may be pulled during transportation to stretch the preheated portion.

[0066] The molded portion may be deformed by air pressure forming, vacuum forming, plug forming, or the like so that an inner surface of the packaging film 23 becomes a recessed portion and an outer surface of the packaging film 23 becomes a protruding portion. In the case of the spout 10, the molded portion is preferably formed at least at a portion at which the base portion 12 is to be installed. In the case of the discharge port opening member 42, the molded portion is preferably formed to include the entire discharge port opening member 42 in accordance with the shape of the discharge port opening member 42.

[0067] The sealing step of the accessories such as the spout 10 may include a step of temporarily fixing the spout 10 with a point seal or the like, and a step of fixing the spout 10 to the packaging film 23. In the temporary fixing step, by heating only a part of the portion at which the accessories such as the spout 10 are to be installed, it is possible to inhibit misalignment with respect to the packaging film 23. By heating a periphery of the accessories such as the spout 10 while they are temporarily fixed to the packaging film 23, fixation of the accessories such as the spout 10 to the packaging film 23 can be more reliably performed.

[0068] According to the embodiment, heat resistance of the packaging film 23 can be ensured by providing the heat-resistant coating layer 30. Thus, even if the portion at which the accessories such as the spout 10 are sealed is heated in multiple stages, such as preheating, forming, temporary fixing, fixing, and the like, shrinkage or the like of the packaging film 23 can be inhibited.

[0069] When unevenness is formed in the packaging film 23 or the accessories such as the spout 10 are fixed, the heat-resistant coating layer 30 preferably allows the packaging film 23 to be moderately stretched and preferably inhibits excessive stretching.

[0070] The polyethylene-based resin used for the accessories such as the spout 10 and/or the packaging bag 20 may be a homopolymer of ethylene or a copolymer mainly composed of ethylene. Examples of monomers (comonomers) other than ethylene include one or more of a-olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When a polyethylene resin is copolymerized with a monomer having an ester group such as vinyl acetate, a portion of the ester group may be saponified to form a copolymer containing vinyl alcohol.

[0071] A proportion of ethylene in constituent monomers of the polyethylene resin used in the accessories such as the spout 10 and/or the packaging bag 20 is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. Ethylene or comonomers may be a compound derived from a fossil resource such as petroleum, or may be a compound derived from biomass such as plants. The resin used in the accessories such as the spout 10 may be only a polyethylene resin, and the resin contained in the polyethylene resin layer of the packaging film 23 may be only a polyethylene resin. At least a portion of the polyethylene resin may contain a recycled polyethylene resin.

[0072] The polyolefin resin (polypropylene resin or polyethylene resin) used for the accessories such as the spout 10 and/or the packaging bag 20 may contain other resins and/or additives to an appropriate extent. The additives are not particularly limited, but examples thereof include antioxidants, lubricants, anti-blocking agents, flame retardants, UV absorbers, light stabilizers, antistatic agents, colorants, crosslinking agents, and the like. The additives may be components that are compatible with the resin, or components that are not compatible with the resin.

[0073] When the packaging bag 20 is used for a mono-material container packaging of a polyethylene resin, with respect to a total weight of the packaging film 23, it is preferable that a total weight of the polyethylene resin be 80% by weight or more and a total weight of materials other than polyethylene resin be 20% by weight or less, and more preferable that the total weight of the polyethylene resin be 90% by weight or more and the total weight of materials other than the polyethylene resin be 10% by weight or less. Thus, even if other resins, additives, adhesives, and the like are used in the packaging film 23, the mono-material packaging bag 20 can be realized.

[0074] When the packaging containers 31, 32, and 40 including the accessories such as the spout 10 and the packaging bag 20 are used for the mono-material container packaging, with respect to a total weight of each of the packaging containers 31, 32, and 40, which is the sum of the accessories such as the spout 10 and the packaging bag 20, it is preferable that a total weight of the polyethylene-based resin is 80% by weight or more and a total weight of materials other than polyethylene-based resin is 20% by weight or less, and it is more preferable that the total weight of polyethylene-based resin is 90% by weight or more and the total weight of materials other than polyethylene-based resin is 10% by weight or less. Thus, even if the accessories such as the spout 10 are not separated from the packaging bag 20, the entire can realize the mono-material packaging containers 31, 32, and 40.

[0075] Although the present invention has been described above on the basis of the preferred embodiment, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the present invention. The modifications include additions, substitutions, omissions, and other changes of constituent elements.

INDUSTRIAL APPLICABILITY

[0076] According to the packaging container according to the present invention, it is possible to inhibit shrinkage of the packaging bag when the spout or the discharge port opening member is sealed to the packaging bag. Accordingly, the present invention is industrially applicable.

REFERENCE SIGNS LIST

[0077] 10 Spout [0078] 11 Tube portion [0079] 12 Base portion [0080] 13 Flow path [0081] 14 Opening portion [0082] 20 Packaging bag [0083] 21 Sealant [0084] 22 Base material [0085] 23 Packaging film [0086] 24 Body member [0087] 25 Side seal portion [0088] 26 Bottom member [0089] 27 Bottom seal portion [0090] 28 Top seal portion [0091] 29 Opening portion [0092] 30 Heat-resistant coating layer [0093] 31, 32, and 40 Packaging container [0094] 41 Discharge port [0095] 42 Discharge port opening member