Packaging container

Abstract

A packaging container is provided with: a packaging bag (20) formed from a packaging film (23) having a sealant (21) in the innermost layer; and a mouth (10) or a spout opening member sealed in the packaging bag (20). The packaging bag (20) has a heat-resistant coating layer (30) that includes at least a region that overlaps the nozzle (10) or the spout opening member with the sealant (21) therebetween, and is formed locally with respect to the area of the packaging film (23).

Description

Technical Field

[0001] The present invention relates to packaging containers.

[0002] This application claims priority based on Japanese Patent Application No. 2022-160999 filed in Japan on October 5, 2022, and the contents are incorporated herein by reference. Background Art

[0003] As a conventional packaging bag, for example, paragraph 0010 of Patent Document 1 describes a standing pouch that uses a laminate film having a sealant such as polyethylene (PE) as an innermost layer and a stretched film such as polyethylene terephthalate (PET), nylon (Ny), or polypropylene (PP) as a base material.

[0004] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2006-7630 Summary of the invention

[0005] Technical issues The composite film used in conventional packaging bags has a sealant on the inner surface and a base material having a higher heat resistance than the sealant on the outer surface. When the composite film is sealed, the sealant is melted to bond the inner surface of the composite film. However, packaging bags containing different types of resins have a problem of being difficult to reuse as plastic container packaging.

[0006] In recent years, the use of container packaging made of a single material or the same resin has been advocated to facilitate recycling. However, if the nozzle of the packaging bag is sealed with a laminated film of a polyethylene resin, the laminated film shrinks around the sealing portion and the strength decreases, resulting in a problem of reduced resistance to falling. In addition, there is also a problem of deterioration of appearance due to shrinkage.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a packaging container capable of suppressing shrinkage of a packaging bag when a nozzle or a pouring spout opening member is sealed to the packaging bag.

[0008] Technical Solution The present invention includes the following aspects.

[0009] A packaging container according to a first embodiment of the present invention comprises: a packaging bag formed by a packaging film having a sealant in the innermost layer; and a nozzle or a pouring opening member sealed to the packaging bag, wherein the packaging bag has a heat-resistant coating, the heat-resistant coating at least including an area overlapping with the nozzle or the pouring opening member via the sealant, and the heat-resistant coating is locally formed relative to the area of ​​the packaging film.

[0010] A packaging container according to a second aspect of the present invention is the packaging container according to the first aspect, wherein the heat-resistant coating is formed as an outermost layer on the side opposite to the sealant in the thickness direction of the packaging film.

[0011] A third aspect of the present invention is a packaging container according to the first or second aspect, wherein the base material of the packaging film, the sealing agent, and the nozzle or the pouring port opening member are all formed of a polyethylene-based resin.

[0012] A packaging container according to a fourth aspect of the present invention is any one of the first to third aspects, wherein the heat-resistant coating layer is formed of a curable resin.

[0013] A packaging container according to a fifth aspect of the present invention is any one of the first to third aspects, wherein the heat-resistant coating layer is formed of a resin having a higher melting point than that of the base material of the packaging film.

[0014] A packaging container according to a sixth aspect of the present invention is the packaging container according to any one of the first to fifth aspects, wherein the packaging bag is a standing bag.

[0015] A packaging container according to a seventh aspect of the present invention is any one of the first to sixth aspects, wherein the packaging bag is used to seal a liquid.

[0016] Technical Effects According to the packaging container of the present invention, it is possible to suppress shrinkage of the packaging bag when the spout or the pouring opening member is sealed to the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a side cross-sectional view showing a sealing portion of a nozzle with respect to a packaging bag in a packaging container according to an embodiment of the present invention.

[0018] Figure 2 It is a front view which shows the 1st example of the packaging container of this embodiment.

[0019] Figure 3 It is a front view which shows the 2nd example of the packaging container of this embodiment.

[0020] Figure 4 This is a partial front view showing a packaging container according to another embodiment of the present invention having a pouring spout opening member at the pouring spout.

[0021] Explanation of symbols 10…nozzle, 11…cylinder, 12…base, 13…flow path, 14…opening, 20…packaging bag, 21…sealant, 22…substrate, 23…packaging film, 24…main body, 25…side sealing, 26…bottom, 27…bottom sealing, 28…upper sealing, 29…opening, 30…heat-resistant coating, 31, 32, 40…packaging container, 41…pouring outlet, 42…pouring outlet opening part. DETAILED DESCRIPTION

[0022] Hereinafter, preferred embodiments of the present invention will be described.

[0023] Figure 1 1 is a side cross-sectional view showing a sealing portion of a nozzle 10 of a packaging container according to an embodiment of the present invention relative to a packaging bag 20. The sealing portion is used for a packaging container having a nozzle 10 and a packaging bag 20. The nozzle 10 is sealed to the packaging bag 20. The packaging bag 20 has a heat-resistant coating 30 in a manner including a region overlapping with the nozzle 10.

[0024] The nozzle 10 shown in the example in the figure has: a cylindrical barrel 11 having an opening 14 serving as a pouring outlet at the front end (upper end in the figure); and a base 12 which is integrally formed into a T-shape at the lower end of the barrel 11 and has a boat-like shape with both ends narrowed when viewed from above, and the base 12 has an area overlapping with the packaging bag 20. The barrel 11 protrudes vertically from the center of the base 12. The two side surfaces of the base 12 are rectangular, and these two side surfaces overlap with the inner surface of the upper center of the packaging bag 20 and are joined by sealing. The heat-resistant coating 30 of this example is formed into a rectangular shape corresponding to the joining surface of the base 12 and the packaging bag 20. The heat-resistant coating 30 can be the same size as the joining surface of the base 12 and the packaging bag 20, or it can be formed to be closer to the joining surface than the joining surface. Figure 2 However, it is preferred that the upper end of the packaging bag 20 is aligned with the upper end of the base 12, and the upper end of the heat-resistant coating 30 is also aligned with the upper end of the base 12. A flow path 13 is formed inside the nozzle 10 so that the contents (not shown) stored in the packaging bag 20 can be poured out. The flow path 13 connects the inside of the packaging bag 20 with the opening 14.

[0025] The content of the packaging bag 20 is not particularly limited, and is preferably a fluid substance such as a liquid, a powder, or a granule. When the content includes a liquid, it may be a mixture such as a solution, a dispersion, an emulsion, or a suspension.

[0026] The shape of the barrel 11 is not particularly limited in the present invention, and may be, for example, a cylindrical shape, an elliptical cylindrical shape, a square cylindrical shape, etc. The base 12 may have a cross-sectional shape larger than that of the barrel 11, or the base 12 may have the same cross-sectional shape as that of the barrel 11. The cross-sectional shape of the base 12 is not particularly limited in the present invention, but on a plane orthogonal to the length direction of the flow path 13, for example, a circular shape, an elliptical shape, a boat shape, etc. may be listed. Although not specifically illustrated here, the boat shape is a shape that protrudes in a roughly triangular shape in both directions of the long axis and is curved in a roughly arc shape in both directions of the short axis.

[0027] The cross-sectional shape of the flow path 13 formed inside the nozzle 10 is not particularly limited in the present invention, but a circular shape, an elliptical shape, a polygonal shape, etc. can be listed on the plane orthogonal to the longitudinal direction. The inner surface of the flow path 13 can be concentric with the outer surface of the barrel 11. The shape of the flow path 13 in the longitudinal direction is not particularly limited in the present invention, and can be a straight line, a curve, a bend, a bending, etc. Although not specifically shown, it is also possible to branch from the same flow path 13 and open two or more openings 14.

[0028] The nozzle 10 is an example of a component mounted on the pouring port of the packaging bag 20. The nozzle 10 shown in the figure has a cylindrical portion 11 protruding to the outside of the region overlapping with the packaging bag 20. The details will be described later, but the heat-resistant coating 30 may be applied to the sealing portion of the pouring port opening component arranged within the region overlapping with the packaging bag 20. In the following description, a component that is an accessory of the packaging bag 20 including the nozzle 10 and the pouring port opening may be referred to as "accessories such as the nozzle 10".

[0029] The packaging bag 20 is formed of a packaging film 23 having a sealant 21 as the innermost layer. The sealant 21 is usually laminated on the entire surface of the packaging film 23. When a plurality of packaging films 23 are overlapped to form the packaging bag 20, the sealants 21 can be bonded to each other. The sealant 21 is preferably formed of a weldable resin. Examples of the weldable resin include polyolefin resins such as polyethylene resins and polypropylene resins, and polyethylene resins are preferred.

[0030] Specific examples of the material forming the sealant 21 include linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE). The material forming the sealant 21 may be a single polyethylene resin or a blend of two or more polyethylene resins. The thickness of the sealant 21 is not particularly limited, and may be, for example, about 60 to 180 μm.

[0031] The packaging film 23 may have at least one layer of a base material 22 as a film different from the sealant 21. The material of the base material 22 is not particularly limited, and polyolefin resins such as polyethylene resins and polypropylene resins may be cited, and polyethylene resins may also be used. The base material 22 preferably has heat resistance that does not melt under the temperature conditions for welding the sealant 21, and is, for example, a resin film having a melting point higher than that of the sealant 21.

[0032] Specific examples of materials when the substrate 22 is formed of a polyolefin resin include linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), polypropylene (PP), etc. The substrate 22 may include a stretched resin film. The thickness of the substrate 22 is not particularly limited, and for example, the thickness of each layer or the total thickness may be about 10 to 50 μm.

[0033] The packaging film 23 may include, for example, a plurality of resin films such as the sealant 21 and the substrate 22. In order to form the packaging bag 20 of a single material, the resin film included in the packaging film 23 is preferably a pure polyolefin resin, more preferably a pure polyethylene resin.

[0034] The plurality of resin films forming the packaging film 23 may be laminated via an adhesive layer by dry lamination or the like, or may be laminated while omitting an adhesive layer by coextrusion, heat lamination or the like. Resin films such as polyethylene resins may be laminated on other resin films by extrusion lamination, sandwich lamination or the like. A printed layer, a vapor-deposited layer or the like may also be formed on at least one surface of each resin film.

[0035] The nozzle 10 and other accessories are preferably formed of a polyolefin resin such as a polyethylene resin or a polypropylene resin. The method for forming the nozzle 10 and other accessories is not particularly limited, and injection molding, extrusion molding, etc. can be cited. The nozzle 10 and other accessories can also be formed by two-color molding, but in terms of cost, it is preferred to use a single resin to form the nozzle 10 and other accessories.

[0036] The nozzle 10 and other accessories are bonded to the packaging bag 20 by sealing with a sealant 21. The sealing method is not particularly limited, and examples thereof include hot plate sealing, ultrasonic sealing, high frequency sealing, and pulse sealing. The molten or softened resin is cooled and solidified, thereby stabilizing the bonding, and thus bonding can be completed in a relatively short time. A cooling mold or the like can be brought into contact with the portion where the nozzle 10 and other accessories are sealed to absorb the remaining heat.

[0037] The packaging bag 20 has the heat-resistant coating 30 so as to include at least the region overlapping with the attachments such as the nozzle 10 via the sealant 21. Thus, it is possible to suppress the shrinkage of the packaging film 23 when the attachments such as the nozzle 10 are sealed to the packaging bag 20. Furthermore, it is possible to suppress the reduction in strength of the packaging film 23, the deterioration in appearance, and the reduction in the drop resistance of the packaging bag 20.

[0038] In the thickness direction of the packaging film 23, the heat-resistant coating 30 is arranged at a position that does not hinder the sealing between the nozzle 10 and other accessories and the packaging bag 20. The heat-resistant coating 30 can be arranged between the sealant 21 and the substrate 22, or it can be set as the outermost layer on the opposite side of the sealant 21. The thickness of the heat-resistant coating 30 is not particularly limited, for example, it can be in the range of 1μm~1mm, it can also be 5~50μm, and it can also be 10~30μm. The thickness of the heat-resistant coating 30 can be 0.5~20% of the thickness of the packaging film 23, or it can be 3~10%. In terms of transferring the heat required for sealing to the nozzle 10 and other accessories, the thickness of the heat-resistant coating 30 is preferably appropriately thinned, and in terms of suppressing the thermal shrinkage of the packaging film 23, the thickness of the heat-resistant coating 30 is preferably appropriately thickened.

[0039] The heat-resistant coating 30 is formed locally relative to the area of ​​the packaging film 23. Although the heat-resistant coating 30 can be formed on the entire surface of the packaging film 23, if the amount of the heat-resistant coating 30 that is different from the melting point, material, etc. of the sealant 21 and the base material 22 of the packaging film 23 is large, the proportion of foreign matter in the packaging bag 20 of a single material increases, which is not preferable.

[0040] The range of forming the heat-resistant coating 30 relative to the area of ​​the packaging film 23 includes at least the area overlapping with the nozzle 10 and other accessories. For example, it is preferable to form the heat-resistant coating 30 in the area where the base 12 of the nozzle 10 is sandwiched between the packaging films 23 and its surroundings. The range of forming the heat-resistant coating 30 can be from the area where the base 12 of the nozzle 10 is sandwiched between the packaging films 23 to the area where the base 12 of the nozzle 10 is sandwiched between the packaging films 23. Figure 2 The left and right directions of the nozzle 10 can be extended to more than 0 mm and less than 50 mm, and can also be extended to about 3 to 10 mm. In addition, the range of forming the heat-resistant coating 30 can be the area where the base 12 of the nozzle 10 is sandwiched between the packaging film 23. Figure 2 The lower part of the center can be expanded to more than 0mm and less than 50mm, and can also be expanded to about 3~10mm.

[0041] The heat-resistant coating 30 is preferably made of a material having higher heat resistance and lower heat shrinkage than the packaging film 23. When the nozzle 10 and other accessories are sealed to the packaging film 23, there is a tendency for the temperature to be higher or the time to be longer, and more heat to be applied to the sealed portion, compared to when the packaging films 23 are sealed to each other. Therefore, under the condition of sealing the nozzle 10 and other accessories, it is preferred that the heat shrinkage of the heat-resistant coating 30 is smaller than that of the packaging film 23.

[0042] As a first embodiment, the heat-resistant coating 30 is formed of a curable resin. Examples of the curable resin include thermosetting resins, ultraviolet curable resins, and electron beam curable resins. Preferably, the resin is a reaction curable resin that is cured by a chemical reaction. The heat-resistant coating 30 can be formed on the outer surface of the packaging film 23 or the substrate 22 by coating or the like.

[0043] The curable resin used in the heat-resistant coating 30 of the first embodiment is not particularly limited, and examples thereof include one or more of polyurethane resin, acrylic resin, epoxy resin, polymethylpentene resin, cyclic olefin resin, unsaturated polyester resin, alkyd resin, polyimide resin, polyamideimide resin, polyamide resin, etc. The heat-resistant coating 30 may also be formed by applying a coating agent such as varnish, followed by drying and curing.

[0044] The coating agent may contain a resin and a solvent, or may contain a solvent-free resin. The coating agent may directly form the heat-resistant coating layer 30 without an adhesive layer or the like between the coating agent and the substrate 22. The coating agent may be applied by printing, inkjet, or the like.

[0045] The type of coating agent is not particularly limited, and examples thereof include a single-liquid type in which the composition is supplied in a premixed state, and a two-liquid reaction type in which the main agent and the additive are supplied separately and mixed when used. The coating agent may be supplied in a concentrated state, or may be diluted when used to obtain an appropriate concentration or viscosity. The solvent of the coating agent may be appropriately selected in consideration of the performance during coating, etc. The coating agent may contain a curing agent, a crosslinking agent, etc. for curing the resin.

[0046] As a second embodiment, the heat-resistant coating 30 is formed 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 in the heat-resistant coating 30 include polyethylene terephthalate (PET), nylon (Ny), polypropylene (PP), etc. The high melting point resin may be a thermoplastic resin. The heat-resistant coating 30 preferably has a lower heat shrinkage than the base material 22.

[0047] The melting point of the sealant 21 may be, for example, 100 to 115° C. The melting point of the substrate 22 may be, for example, about 135° C. The melting point of the nozzle 10 and other accessories may be, for example, 127 to 130° C. The heat-sealing temperature of the nozzle 10 and other accessories with respect to the packaging film 23 is, for example, about 140° C. The heat-resistant coating 30 preferably has a melting point higher than the heat-sealing temperature of the nozzle 10 and other accessories.

[0048] There is no limitation in the present invention. For example, the melting point of the heat-resistant coating 30 may be 30-150°C higher than the melting point of the sealant 21. The melting point of the heat-resistant coating 30 may be 10-130°C higher than the melting point of the substrate 22. The melting point of the heat-resistant coating 30 may be 160-260°C.

[0049] Specific examples of the packaging bag 20 are not particularly limited in the present invention, but include triangular sealed bags, four-corner sealed bags, pillow bags, flat bags, gusseted bags, and self-supporting bags. Figure 2 and Figure 3 Specific examples of packaging containers 31 and 32 using the packaging bag 20 of a standing bag are shown in FIG. In the packaging bag 20 used in the packaging containers 31 and 32, the main body member 24 is composed of a pair of packaging films 23, and a bottom member 26 is sandwiched between the pair of packaging films 23.

[0050] The bottom member 26 is folded in half and arranged at the lower part of the main body member 24. Side seals 25 are formed on the left and right sides of the upper side of the bottom member 26, and the front and rear main body members 24 are joined to each other. The bottom member 26 and the main body member 24 are joined by a bottom seal 27. One side of the folded bottom member 26 is joined to the front main body member 24, and the other side of the bottom member 26 is joined to the rear main body member 24. If the bottom member 26 is unfolded, the packaging bag 20 can be made self-standing.

[0051] An upper seal portion 28 is formed on the upper portion of the main body member 24. The nozzle 10 is sealed to a portion of the upper seal portion 28. The front and rear main body members 24 are joined via the upper seal portion 28 at locations other than the nozzle 10.

[0052] The heat-resistant coating 30 may be formed in the area overlapping with the base 12 of the nozzle 10 or may be formed around at least a portion of the upper seal portion 28. The heat-resistant coating 30 may also be formed extending to the unsealed portion between the packaging films 23.

[0053] like Figure 2 As shown, in the case of the packaging container 31 of the first example, the upper seal portion 28 connects between the left and right side seal portions 25, and the nozzle 10c is sealed to the center portion of the upper seal portion 28 in a manner facing upward, thereby sealing the interior of the packaging bag 20. After the packaging bag 20 is filled with the contents through the nozzle 10, the nozzle 10 is closed using a cover (not shown) such as a cap, thereby enabling the packaging bag 20 to be sealed.

[0054] like Figure 3As shown, in the case of the packaging container 32 of the second example, an opening 29 consisting of an unsealed portion is formed at the upper part of the main body member 24 so as to be in contact with one of the left and right side seal portions 25. A portion of the upper seal portion 28 is formed obliquely, and the nozzle 10 is sealed obliquely. In the case of the packaging bag 20 having the opening 29, the contents can be filled into the packaging bag 20 from the opening 29 without opening the nozzle 10. In addition, the packaging bag 20 filled with the contents can be sealed by joining the unsealed portion of the opening 29.

[0055] like Figure 4 As shown in the figure, as an accessory similar to the nozzle 10, a pouring opening member 42 sealed inside the packaging bag 20 can also be used. The packaging container 40 illustrated in the figure has a film-like pouring opening 41 formed on the main body member 24 of the packaging bag 20. The pouring opening 41 can also be formed in a shape that protrudes thinly at the upper part or corner of the packaging bag 20.

[0056] The pouring spout 41 is formed by a pair of packaging films 23 forming the main body part 24. The pouring spout opening part 42 is sealed between the packaging films 23. In the outer periphery of the pouring spout 41, the front and rear main body parts 24 are joined to each other by a sealing part formed continuously from the side sealing part 25. Inside the pouring spout 41, the front and rear main body parts 24 are not sealed to form a flow path. The pouring spout opening part 42 is provided in the flow path of the pouring spout 41.

[0057] The shape of the pouring spout opening member 42 is not particularly limited, and may be, for example, a cylindrical shape with a circular, elliptical or polygonal cross section, a cage shape having a plurality of openings on the circumference of the cylindrical body, a ring shape formed by shortening the cylindrical body in the axial direction, etc. The pouring spout opening member 42 illustrated in the figure is a cylindrical straw having an axis extending from the lower right to the upper left, similarly to the flow path of the pouring spout 41.

[0058] The pouring opening part 42 and the main body part 24 may be sealed so that the contents flow only inside the pouring opening part 42. The pouring opening part 42 and the main body part 24 may be partially sealed so that the contents flow between the pouring opening part 42 and the main body part 24.

[0059] The formation range of the heat-resistant coating 30 with respect to the pouring spout opening part 42 includes at least the region where the packaging film 23 overlaps the pouring spout opening part 42. For example, it is preferable to form the heat-resistant coating 30 in the region where the pouring spout opening part 42 is sandwiched between the packaging films 23 and its periphery. The material, thickness, and size of the heat-resistant coating 30 may be the same as those in the first example.

[0060] The pouring spout 41 formed by the main body member 24 is opened by tearing the main body member 24. In order to facilitate opening, a structure such as a perforation line, a notch, a half-cut groove, etc. may be formed in the thickness direction of the packaging film 23. In order to facilitate opening of the pouring spout 41, a notch or other slit may be formed on the periphery of the opening portion. If a slit is formed in the sealed portion formed by joining the main body members 24 at the outer periphery of the pouring spout 41, the sealing property of the packaging bag 20 can be ensured.

[0061] Figure 4 The lower portion of the packaging container 40 is not shown in the figure, but is similar to Figure 2~3 Similarly, in the packaging containers 31 and 32 shown, the packaging bag 20 can be made self-standing by sandwiching the bottom member 26 between the main body members 24 .

[0062] When the bottom member 26 is placed on the lower side, the nozzle 10 or the pouring spout 41 is preferably arranged upward or obliquely upward relative to the packaging bag 20. Thus, even when the nozzle 10 or the pouring spout 41 is opened, the contents do not leak out of the nozzle 10 or the pouring spout 41, and the packaging bag 20 can stand on its own. If the nozzle 10 or the pouring spout 41 is placed horizontally, downward, or obliquely downward, the contents are poured out of the packaging bag 20.

[0063] exist Figure 2 In the packaging container 31 shown, the nozzle 10 is arranged upward. Figure 3 In the packaging container 32 shown, the nozzle 10 is arranged obliquely upward. Figure 4 In the packaging container 40 shown, the pouring spout 41 is provided obliquely upward. Although not particularly shown, the film-type pouring spout 41 can be provided upward.

[0064] The size of the packaging bag 20 is not particularly limited. For example, in the case of a refill container, the height in the vertical direction may be about 100 to 500 mm, the width in the horizontal direction may be about 70 to 300 mm, and the filling volume may be about 100 cm. 3 ~5000cm 3 As the state of the contents, fluids such as liquids, powders, and granules can be listed, and the purpose of the packaging bag 20 can also be to seal liquids. As the types of contents, there are no particular restrictions, and detergents, medicaments, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, fuels, etc. can be listed.

[0065] When the packaging bag 20 is made from the long packaging film 23 and the attachments such as the nozzle 10 are sealed to manufacture the packaging containers 31, 32, and 40, the heat-resistant coating 30 is formed in the step of forming the long packaging film 23. For example, after the rolled packaging film 23 is flatly unrolled and the heat-resistant coating 30 is formed, the packaging containers 31, 32, and 40 are obtained by performing the sealing step of the attachments such as the nozzle 10 and the sealing step of the packaging bag 20.

[0066] The packaging film 23 may be rolled up again after the heat-resistant coating 30 is formed on one side of the flat packaging film 23. The packaging containers 31, 32, 40 may be manufactured without rolling up the packaging film 23 on which the heat-resistant coating 30 is formed in the flat state.

[0067] Before the sealing process of the attachments such as the nozzle 10, the packaging film 23 may be formed with a shaped portion such as a concave and convex portion. Before forming the shaped portion, the portion of the packaging film 23 to be the shaped portion may be preheated. Furthermore, the packaging film 23e may be stretched during transportation to stretch the preheated portion.

[0068] The molded portion can be deformed by pressure forming, vacuum forming, plug forming, etc. so that the inner surface of the packaging film 23 becomes a concave portion and the outer surface of the packaging film 23 becomes a convex portion. In the case of the nozzle 10, it is preferable to form the molded portion at least at the location where the base 12 is provided. In the case of the pouring spout opening member 42, it is preferable to form the molded portion along the shape of the pouring spout opening member 42 so as to include the entirety.

[0069] The sealing process of the attachments such as the nozzle 10 may include a temporary fixing process such as point sealing and a fixing process to the packaging film 23. In the temporary fixing process, by heating only a part of the location where the attachments such as the nozzle 10 are provided, it is possible to suppress positional deviation relative to the packaging film 23. By heating the periphery of the attachments such as the nozzle 10 in the state of being temporarily fixed to the packaging film 23, it is possible to more reliably fix them to the packaging film 23.

[0070] According to the embodiment, the heat-resistant coating 30 is provided to ensure the heat resistance of the packaging film 23. Thus, even if the portion where the attachments such as the nozzle 10 are sealed is heated in multiple steps such as preheating, forming, temporary fixing, and fixing, shrinkage of the packaging film 23 can be suppressed.

[0071] Regarding the heat-resistant coating 30 , when forming projections and depressions on the packaging film 23 or attaching the nozzle 10 and other accessories, it is preferable to appropriately stretch the packaging film 23 and to suppress excessive stretching.

[0072] The polyethylene resin used in the nozzle 10 and other accessories and / or the packaging bag 20 may be a homopolymer of ethylene or a copolymer mainly composed of ethylene. As monomers (comonomers) other than ethylene, one or more of α-olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, vinyl acetate, vinyl chloride, acrylic acid, and other vinyl monomers may be cited. In the case of copolymerizing the polyethylene resin with a monomer having an ester group such as vinyl acetate, a part of the ester group may be saponified to form a copolymer containing vinyl alcohol.

[0073] The proportion of ethylene in the structural monomer of the polyethylene resin used for the attachments such as the nozzle 10 and / or the packaging bag 20 is preferably 50% by weight or more, for example, 80 to 100% by weight. Ethylene or comonomers may be compounds derived from fossil resources such as petroleum, or compounds derived from biomass such as plants. The resin used for the attachments such as the nozzle 10 may be only polyethylene resin, and the resin contained in the polyethylene resin layer of the packaging film 23 may be only polyethylene resin. At least a portion of the polyethylene resin may include recycled polyethylene resin.

[0074] The polyolefin resin (polypropylene resin or polyethylene resin) used in the nozzle 10 and other accessories and / or the packaging bag 20 may contain other resins and / or additives within an appropriate range. The additives are not particularly limited, and examples thereof include antioxidants, lubricants, anti-blocking agents, flame retardants, ultraviolet absorbers, light stabilizers, antistatic agents, colorants, crosslinking agents, etc. The additives may be components that are compatible with the resin or components that are incompatible with the resin.

[0075] When the packaging bag 20 is a container package made of a single material of polyethylene resin, the total amount of polyethylene resin is preferably 80% by weight or more, and the total amount of materials other than polyethylene resin is preferably 20% by weight or less, and the total amount of polyethylene resin is more preferably 90% by weight or more, and the total amount of materials other than polyethylene resin is preferably 10% by weight or less, relative to the total weight of the packaging film 23. Thus, even if the packaging film 23 uses other resins, additives, adhesives, etc., a packaging bag 20 made of a single material can be realized.

[0076] In the case of using the packaging container 31, 32, 40 having the nozzle 10 and other accessories and the packaging bag 20 as a container packaging made of a single material, it is preferred that the total weight of the polyethylene resin is 80% by weight or more and the total weight of materials other than the polyethylene resin is 20% by weight or less, and it is further preferred that the total weight of the polyethylene resin is 90% by weight or more and the total weight of materials other than the polyethylene resin is 10% by weight or less, with respect to the total weight of the packaging container 31, 32, 40 obtained by adding the nozzle 10 and other accessories and the packaging bag 20. Thus, even if the nozzle 10 and other accessories are not separated from the packaging bag 20, the packaging container 31, 32, 40 made of a single material can be realized.

[0077] Although the present invention has been described above based on preferred embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention. Modifications include addition, replacement, omission, and other changes of constituent elements.

[0078] Industrial Application Possibility According to the packaging container of the present invention, it is possible to suppress shrinkage of the packaging bag when the nozzle or the pouring opening member is sealed to the packaging bag. Therefore, the present invention is industrially applicable.

Claims

1. A packaging container, characterized in that: have: a packaging bag formed of a packaging film having a sealant at an innermost layer; and a nozzle or pouring opening member, which is sealed to the packaging bag, The packaging bag has a heat-resistant coating including at least a region overlapping with the nozzle or the pouring spout opening member via the sealant, and the heat-resistant coating is formed locally with respect to the area of ​​the packaging film.

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

3. The packaging container according to claim 1, characterized in that: The base material of the packaging film, the sealant, and the nozzle or the pouring opening member are all formed of a polyethylene-based resin.

4. The packaging container according to claim 1, characterized in that: The heat-resistant coating layer is formed of a curable resin.

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

6. The packaging container according to any one of claims 1 to 5, characterized in that: The packaging bag is a stand-up bag.

7. The packaging container according to any one of claims 1 to 5, characterized in that: The packaging bag is used for sealing liquid.

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