Standing pouch and package

Abstract

To provide a standing pouch and a package having sufficient strength and hygiene even when the content of a recycled resin is made sufficiently high.SOLUTION: Disclosed is a standing pouch formed by heat-sealing a pair of body films and a bottom film having a mountain part. Each of the body films comprises an external layer base material and a sealant layer, and the bottom film comprises an external layer base material and a sealant layer. In each of the pair of body frames and the bottom film, the external layer base material and the sealant layer are made of a polyolefin resin film, each of the pair of body films and the bottom film contains a recycled resin, the content of the recycled resin in the standing pouch is 10 vol.% or more or 10 mass% or more, and the recycled resin is a chemical recycled resin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to stand-up pouches and packaging articles. [Background technology]

[0002] A packaged article formed by filling a content into a standing pouch can stand on its own. Therefore, such a packaged article can be stored in a box in a self-standing state, for example, and is easy to pack. Furthermore, such a packaged article can be easily arranged on a store shelf in an attractive manner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-206384 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors selected a laminate containing recycled resin as the laminate for forming the stand-up pouch. Recycled resins include post-consumer resins (hereinafter also referred to as "PCR") that may contain contaminants such as paper, ink, and food residue.

[0005] When PCR is a recycled resin containing contaminants, so-called material recycled resin, if a laminate with a high PCR content is used in a standing pouch, the inventors' studies have revealed that the following problems arise. That is, in such a standing pouch, impurities and foreign matter such as gels and aggregates may appear on the surface, and there is room for improvement in terms of hygiene. Furthermore, there is room for improvement in terms of strength in such standing pouches.

[0006] The present disclosure provides stand-up pouches and packaging articles that have sufficient strength and hygiene even when the recycled resin content is sufficiently high. [Means for solving the problem]

[0007] One aspect of the present disclosure provides a standing pouch formed by heat-sealing a pair of main body films and a bottom film having a mountain fold portion, wherein the pair of main body films each have an outer layer base material and a sealant layer, the bottom film has an outer layer base material and a sealant layer, the outer layer base material and the sealant layer in the pair of main body films and the bottom film are polyolefin resin films, the pair of main body films and the bottom film contain recycled resin, the content of recycled resin in the standing pouch is 10% by volume or more or 10% by mass or more, and the recycled resin is a chemical recycled resin.

[0008] In the above-mentioned stand-up pouch, the recycled resin is chemically recycled resin. Chemically recycled resin is produced by first breaking down discarded resin into low molecular weight molecules through a process that involves gasifying, converting it into oil, and then monomerizing it through refined naphtha, or by a process that involves depolymerizing it, depending on the material's characteristics. Therefore, chemically recycled resin is less likely to be contaminated with foreign matter such as impurities, gels, and aggregates than material recycled resin, which is made by cleaning and crushing resin products such as recovered used packaging materials, then heating and melting them to recycle them into raw materials. This improves hygiene. Furthermore, unlike material recycled resins, chemically recycled resins are not subject to heat treatments such as melting after the recycling process, making them less susceptible to thermal degradation, thereby reducing the generation of odors and foreign matter caused by thermal degradation. This reduces defects such as missing characters in the printing process due to foreign matter and adhesive problems (lamination lifting) in the lamination process. It also reduces the risk of a standing pouch filled with contents being torn apart by a foreign matter when dropped. As a result, the above-mentioned standing pouch has a pair of main film and bottom film containing recycled resin, and even if the recycled resin content is increased to 10% by volume or more or 10% by mass or more, it has sufficient hygiene and strength.

[0009] The higher the content (usage ratio) of recycled resin in the stand-up pouch, the more the environmental impact can be reduced. The content of recycled resin in the stand-up pouch is preferably 20% by mass or more, more preferably 25% by mass or more, even more preferably 30% by mass or more, and particularly preferably 40% by mass or more. Here, when it is not easy to calculate the mass ratio (mass%), the unit of the recycled resin content may be "volume %" so that it can be calculated using the film thickness ratio. In other words, the ratio of the film thickness of the layer using recycled resin to the total film thickness of the main body film and bottom film that make up the stand-up pouch can be used as the recycled resin content (volume %). The densities of polyethylene and polypropylene that make up the majority of the packaging material are 0.88 to 0.97 g / cm 3 The range of the recycled resin content specified in volume % generally satisfies the value specified in mass %. That is, the recycled resin content of the standing pouch is preferably 20% by volume or more, more preferably 25% by volume or more, even more preferably 30% by volume or more, and particularly preferably 40% by volume or more.

[0010] In the pair of main film and bottom film, the polyolefin resin film may be a polyethylene film. In this case, both the outer layer base material and the sealant layer contain polyethylene film, improving recyclability.

[0011] The pair of main film and bottom film may further include an intermediate substrate between the outer layer substrate and the sealant layer. In this case, the outer layer base material is reinforced by the intermediate base material, so that the strength of the pair of main body films and the bottom film can be further improved. The intermediate substrate is preferably made of a polyolefin resin, and the outer substrate layer and the sealant layer are preferably made of the same material.

[0012] In the standing pouch, the recycled resin may be a post-consumer recycled resin (PCR). PCR can be secured in large quantities on the market, which reduces the cost of the pair of main film and bottom film. The recycled resin may be a combination of PCR and post-industrial recycled resin (PIR).

[0013] In the pair of main body films and the bottom film, the sealant layer may be a non-recycled polyolefin resin film. The sealant layer is the layer that comes into contact with the contents when they are placed in the stand-up pouch. If the sealant layer is a non-recycled polyolefin resin film, it is possible to further reduce the possibility that impurities and foreign matter such as gels and aggregates will migrate to the contents as a result of heating during retort or boiling treatment of the stand-up pouch. It is preferable to use a biomass-derived polyolefin resin film as the sealant layer, since in this case petroleum is not used for the sealant layer, and therefore the amount of petroleum used can be reduced.

[0014] In the pair of main body films and the bottom film, the sealant layer may be composed of a plurality of layers, and the layer located farthest from the outer layer base material may be a non-recycled polyolefin resin film. The layer of the sealant layer located farthest from the outer layer substrate is the layer that comes into contact with the contents when the contents are placed in the stand-up pouch. If this layer is a non-recycled polyolefin resin film, the possibility of impurities and foreign matter such as gels and aggregates migrating to the contents upon heating during retort or boiling treatment of the stand-up pouch can be further reduced.

[0015] The pair of main body films and the bottom film may further include a gas barrier layer between the outer layer base material and the sealant layer. In this case, the gas barrier properties of the pair of main body films and the bottom film are further improved, so that when contents are placed in the stand-up pouch, deterioration of the contents due to gases such as oxygen can be effectively suppressed.

[0016] Another aspect of the present disclosure provides a packaging article comprising the stand-up pouch described above and contents contained within the stand-up pouch. As already mentioned, according to the above-mentioned packaging article, the chemically recycled resin contained in the pair of main film layers and the bottom film is less likely to be contaminated with foreign matter such as impurities, gels, and aggregates than materially recycled resin. Furthermore, unlike materially recycled resin, chemically recycled resin is not subject to heat treatments such as heat melting after the recycling process, and is therefore less susceptible to thermal degradation. Therefore, even if the recycled resin content in the pair of main film layers and the bottom film is sufficiently high, at 10% by volume or more or 10% by mass or more, the packaging article can be safely stored with its contents, such as food, contained therein. Furthermore, the packaging article has sufficient strength. [Effects of the Invention]

[0017] According to the present disclosure, stand-up pouches and packaging articles are provided that have sufficient strength and hygiene even when the recycled resin content is sufficiently high. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a front view of a packaging article according to one embodiment of the present disclosure. [Figure 2] FIG. 2 is an enlarged cross-sectional view of a portion of the package shown in FIG. [Figure 3] FIG. 3 is an enlarged cross-sectional view showing a part of a standing pouch used to manufacture the packaged article of FIG. [Figure 4] FIG. 4 is a front view of a packaged article according to a modified example. [Figure 5] FIG. 5 is a cross-sectional view showing an example of a laminate that can be used as the main film and the bottom film of a standing pouch according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is a cross-sectional view showing another example of a laminate that can be used as the main film and the bottom film of a standing pouch according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0019] Preferred embodiments of the present disclosure will be described in detail below. In the drawings, the same or corresponding parts are designated by the same reference numerals, and redundant explanations will be omitted.

[0020] [Standing pouches and packaging items] The stand-up pouch and packaging article according to the present embodiment will be described below. Fig. 1 is a front view of a packaging article according to one embodiment of the present disclosure. Fig. 2 is a cross-sectional view showing an enlarged portion of the packaging article shown in Fig. 1. Fig. 3 is a cross-sectional view showing an enlarged portion of a stand-up pouch used to manufacture the packaging article of Fig. 1.

[0021] Here, the cross section in Fig. 2 is a portion near the bottom of a cross section perpendicular to the width direction of the packaged article 100 shown in Fig. 1 and passing through the center of the width. The cross section in Fig. 3 corresponds to the portion of the cross section of the stand-up pouch 110 depicted in Fig. 2. Immediately after production, the stand-up pouch 110 has a folded, flat bottom, but in Fig. 3, the bottom is slightly expanded to make it easier to understand.

[0022] The packaged article 100 shown in FIGS. 1 and 2 includes a stand-up pouch 110, which is a package, and a content 120 contained therein.

[0023] As shown in FIGS. 2 and 3, the standing pouch 110 includes a pair of main body films 111A and 111B and a bottom film 112.

[0024] As described below, the main films 111A and 111B and the bottom film 112 are each a laminate including an outer layer base material and a sealant layer. The main films 111A and 111B and the bottom film 112 may be composed of the same laminate. This makes it easier to procure materials for the laminate, and procuring large amounts of the same material tends to reduce costs. The main films 111A and 111B and the bottom film 112 may be composed of different laminates.

[0025] In the standing pouch 110 before being filled with the content 120, the main body films 111A and 111B are arranged with their sealant layers facing each other, as shown in Fig. 3. The bottom film 112 is folded in half to form a mountain fold when viewed from the sealant layer side, and is sandwiched between the main body films 111A and 111B at one end thereof so that the mountain fold MF faces the other end of the main body films 111A and 111B.

[0026] The edges of the main body films 111A and 111B are heat-sealed to each other from the mountain fold MF of the bottom film 112 to the other ends of the main body films 111A and 111B, thereby forming heat-sealed portions HS1 shown in FIG.

[0027] The bottom film 112, excluding its central portion, is heat-sealed to the main body films 111A and 111B. Specifically, one of the two portions of the bottom film 112 defined by the mountain fold MF is heat-sealed to the main body film 111A at a position other than the central portion of the bottom film 112, forming the heat-sealed portion HS2A shown in FIGS. 1 to 3. The other of the two portions of the bottom film 112 defined by the mountain fold MF is heat-sealed to the main body film 111B at a position other than the central portion of the bottom film 112, forming the heat-sealed portion HS2B shown in FIGS. 2 and 3. The outer surfaces of these two portions of the bottom film 112 are bonded to each other at either side of the bottom of the standing pouch 110.

[0028] The heat-sealed portions HS1 and HS4 shown in Fig. 1 are portions heat-sealed by a side seal and a point seal, respectively, which will be described later. The heat-sealed portion HS2A shown in Figs. 1 to 3 and the heat-sealed portion HS2B shown in Figs. 2 and 3 are portions heat-sealed by a bottom seal, which will be described later.

[0029] In the packaged article 100 in which the content 120 is accommodated in the standing pouch 110, the main body films 111A and 111B are further heat-sealed at the other ends thereof, thereby forming the heat-sealed portions HS3 shown in FIG.

[0030] The standing pouch 110 is formed so that its upper corner can be used as a mouth after opening. An easy-to-open structure can be provided at the position of this corner. The easy-to-open structure is, for example, a notch.

[0031] The standing pouch 110 may be formed so that a portion other than the upper corners can be used as a mouth after opening. For example, the standing pouch 110 may be formed so that the upper center portion can be used as a mouth after opening. The standing pouch 110 may also include a mouth member and a lid at its upper portion. For example, as in the standing pouch 110 of the packaged article 100A shown in FIG. 4, a spout 113, which is a member for extracting the contents, may be interposed between the main films 111A and 111B at the upper position of the standing pouch 110, and a cap 114, which is a member for sealing the spout 113, may be welded to the main films 111A and 111B and fitted or screwed onto the mouth of the spout 113.

[0032] The contents 120 may be, for example, a liquid, a solid, or a mixture of a liquid and a solid, such as food, shampoo, conditioner, body wash, detergent, or medicine.

[0033] Although there is no limit to the volume of the contents 120, the technology described here is particularly useful when the volume of the contents 120 is large. From this perspective, the volume of the contents 120 is preferably within the range of 0.2 to 4.0 L. The volume of the contents 120 is more preferably 0.8 L or more. Furthermore, the volume of the contents 120 is more preferably 3.0 L or less.

[0034] (A) Recycled resin content In the standing pouch 110, the recycled resin content is 10% by volume or more or 10% by mass or more. In addition, when the laminate contains recycled resin and the outer layer substrate 11, intermediate substrate 12, sealant layer 13, and other layers described below are a mixture of recycled resin and non-recycled resin such as petroleum-derived resin or biomass-derived resin, the mass of the recycled resin in each of the outer layer substrate 11, intermediate substrate 12, sealant layer 13, and other layers is calculated according to the mass ratio, and the recycled resin content (mass %) in the standing pouch 110 is calculated.

[0035] In the present disclosure, the above-mentioned recycled resin is a chemical recycled resin and does not include material recycled resin. The chemically recycled resin may be post-consumer recycled resin (PCR), post-industrial recycled resin (PIR), or a mixture thereof, but is preferably PCR. PCR is available in large quantities on the market, so if the chemically recycled resin is PCR, the cost of the laminate 10 can be reduced.

[0036] (B) Polyolefin resin content The polyolefin resin content in the standing pouch 110 is preferably 80% by volume or more or 80% by mass or more, more preferably 85% by volume or more or 85% by mass or more, and particularly preferably 90% by volume or more or 90% by mass or more. When the content of polyolefin resin in the standing pouch 110 is 80% by volume or more or 80% by mass or more, the content of polyolefin resin in the entire standing pouch 110 becomes high, and the recyclability of the standing pouch 110 is further improved.

[0037] From the viewpoint of reducing the environmental load, the content of biomass-derived polyolefin resin in the standing pouch 110 is preferably 10% by volume or more or 10% by mass or more, and more preferably 20% by volume or more or 20% by mass or more. However, the content of biomass-derived polyolefin resin in the standing pouch 110 may be 0% by volume or 0% by mass.

[0038] In the laminate 10, the polyolefin resin films in the outer layer substrate 11, the intermediate substrate 12, and the sealant layer 13 may all be polyethylene films.

[0039] (C) Fisheye Fisheyes refer to foreign matter such as fish-eye-like specks (gelled matter) found in film, gels such as carbonized matter, and aggregates. If fisheyes with a diameter of 1 mm or more are present, they are likely to cause problems during processing (described below) and problems with the strength of the standing pouch. The number of fisheyes with a diameter of 0.5 mm or more but less than 1 mm is 100 / m 2 Less than 50 pieces / m 2 Less than 10 pieces / m 2 It would be better if it was below. In this case, defects such as missing characters in the printing process due to foreign matter and adhesive defects (lamination lifting) in the lamination process are suppressed. In addition, tearing of the pouch caused by foreign matter when the filled standing pouch is dropped is suppressed.

[0040] (D) Odor components In a total ion chromatogram obtained by performing mass analysis using purge-and-trap gas chromatography-mass spectrometry on the laminate constituting the standing pouch, when the ratio of the peak area of ​​nonanal as an indicator of odor components to the sum of the peak areas of all aliphatic hydrocarbon components is defined as R1 (%), and the ratio of the peak area of ​​decanal to the sum of the peak areas of all aliphatic hydrocarbon components is defined as R2 (%), R1 is preferably less than 1.5%, more preferably 1.0% or less, and particularly preferably 0.5% or less. Furthermore, R2 is preferably less than 0.35%, more preferably 0.25% or less, and particularly preferably 0.15% or less. It is preferable that R1 is less than 1.5% and R2 is less than 3.5%, in which case thermal degradation is suppressed throughout the laminate, further improving the quality of the laminate. Specifically, the mass analysis is carried out by cutting out a 1.0 gram sample from the laminate 10, placing this sample in a 20 mL vial together with a collector of odorous components, heating it at 60°C for 1 hour to adsorb the volatile components from the sample onto the collector, and then analyzing the volatile components in the collector using a purge-and-trap gas chromatograph mass analyzer.

[0041] <Laminate> An example of a laminate that can be used as the main body film and the bottom film of the standing pouch according to the above embodiment will be described below. Figures 5 and 6 are cross-sectional views showing an example of the laminate.

[0042] As shown in FIG. 5, the laminate 10 includes an outer layer base material 11 and a sealant layer 13. The laminate 10 may further include an intermediate substrate 12 between the outer layer substrate 11 and the sealant layer 13 . The outer layer base material 11 and the sealant layer 13 are made of a polyolefin resin film, and the recycled resin content in the laminate 10 may be 10% by volume or more or 10% by mass or more. Here, the recycled resin is a chemically recycled resin. The recycled resin content in the laminate 10 may be 20% by mass or more, 25% by mass or more, 30% by mass or more, or 40% by mass or more. The recycled resin content in the laminate 10 may be 20% by volume or more, 25% by volume or more, 30% by volume or more, or 40% by volume or more.

[0043] The laminate 10 may further include a printed layer 15 as shown in FIG. As shown in FIG. 6, the laminate 10 may further include a gas barrier layer 16 together with the printed layer 15, or may further include the gas barrier layer 16 instead of the printed layer 15.

[0044] (Outer layer base material) The outer layer base material 11 is made of a polyolefin resin film, and the polyolefin resin film contains a resin made of polyolefin resin.

[0045] Examples of polyolefin resins include polyethylene and polypropylene.

[0046] Polyethylene is a resin containing ethylene as a structural unit. Examples of polyethylene include ethylene homopolymers and copolymers of ethylene with other monomers. The proportion of ethylene in polyethylene is, for example, 80 mol % or more. Examples of other monomers include α-olefins, vinyl acetate, and acrylic esters. The α-olefin may be an olefin having a carbon number in the range of 3 to 20. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 3-methyl-1-butene, 4-methyl-1-pentene, and 6-methyl-1-heptene. Examples of polyethylene include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), very low-density polyethylene (VLDPE), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, etc. These may be used alone or in combination of two or more. The polyethylene preferably contains at least HDPE or MDPE to increase rigidity.

[0047] Polypropylene is a resin containing propylene as a structural unit, but may not contain ethylene as a structural unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[0048] The polyolefin resin may be a non-recycled polyolefin resin, a chemically recycled polyolefin resin, or a mixture thereof. The non-recycled polyolefin resin may be a petroleum-derived polyolefin resin obtained using petroleum-derived raw material monomers, a biomass-derived polyolefin resin obtained using biomass-derived raw material monomers, or a mixture thereof, but from the viewpoint of reducing the environmental load, a biomass-derived polyolefin resin is preferred. The chemically recycled polyolefin resin may be composed of a single chemically recycled polyolefin resin, or may be composed of a mixture of multiple types of chemically recycled polyolefin resins.

[0049] Furthermore, this outer layer base material 11 may have a single layer or a multi-layer structure. In the case of a multi-layer structure, the outer layer base material 11 is formed from a layer configuration of two or more layers, at least one of which contains chemically recycled polyolefin. Furthermore, the outer layer substrate 11 may be a layer formed by coextrusion of a layer made of ethylene-vinyl alcohol copolymer or a layer made of polyamide, optionally with an adhesive resin, and then stretching the resulting film. Examples include a three-type five-layer substrate consisting of chemically recycled polyolefin / adhesive resin / ethylene-vinyl alcohol copolymer / adhesive resin / chemically recycled polyolefin, a three-type three-layer substrate consisting of chemically recycled polyolefin / adhesive resin / ethylene-vinyl alcohol copolymer, and a multilayer substrate consisting of petroleum-derived (natural) polyolefin resin / chemically recycled polyolefin / petroleum-derived (natural) polyolefin resin, or petroleum-derived (natural) polyolefin resin / other polyolefin / chemically recycled polyolefin / other polyolefin / petroleum-derived (natural) polyolefin resin. Note that in a multilayer substrate, the specific gravities of materials of the same type may differ depending on their functions.

[0050] The outer layer base material 11 may further contain additives such as fillers, antistatic agents, plasticizers, lubricants, light-shielding pigments, and antioxidants, as needed. When the outer layer base material 11 contains a light-shielding pigment, the outer layer base material 11 can function as a light-shielding layer.

[0051] The melting point of the outer layer base material 11, when it is mainly composed of polyethylene, is preferably in the range of 100 to 140°C, and more preferably in the range of 120 to 140°C. When it is mainly composed of polypropylene, it is preferably in the range of 120 to 175°C. The melting point is measured by a method in accordance with JIS K7121-1987.

[0052] The outer layer base material 11 may be an unstretched film or a stretched film. The stretched film may be a uniaxially stretched film or a biaxially stretched film. The outer layer base material 11 may be composed of either a stretched film or an unstretched film. If the outer layer base material 11 is uniaxially stretched, the tearability and heat resistance of the laminate 10 can be improved. If the outer layer base material 11 is a biaxially stretched film, the mechanical strength and dimensional stability of the laminate 10 can be improved.

[0053] Whether a stretched film is uniaxially or biaxially stretched can be determined by in-plane measurement using wide-angle X-ray diffraction, as described in detail below. The X-ray diffraction pattern obtained by in-plane measurement contains information about the degree of orientation of molecular chains present in the film plane.

[0054] When a polymer film is uniaxially stretched, a higher-order structure called a shish kebab structure appears. The shish kebab structure consists of a shish structure, which is an extended chain crystal, and a kebab structure, which is a lamellar crystal. In a uniaxially stretched film, this higher-order structure is arranged with a high degree of order, and the X-ray diffraction pattern obtained by the above measurement of the uniaxially stretched film contains a sharp diffraction peak. In other words, when the above measurement is performed on a uniaxially stretched film, a clear diffraction peak appears. Note that a "clear diffraction peak" means a diffraction peak with a half-width of less than 10°.

[0055] In contrast, in the production of biaxially stretched film, the film is stretched in a specific direction, and then stretched in a direction perpendicular to the first direction. Therefore, although the above-mentioned high-order structure is generated by the first stretching, the high-order structure is destroyed by the second stretching. Therefore, when in-plane measurements are performed on biaxially stretched film, the diffraction peaks in the resulting X-ray diffraction pattern are broad. In other words, when in-plane measurements are performed on biaxially stretched film, clear diffraction peaks do not appear.

[0056] As described above, the X-ray diffraction patterns obtained by in-plane measurement differ between uniaxially stretched films and biaxially stretched films. Therefore, it is possible to determine whether a stretched film is uniaxially stretched or biaxially stretched based on the in-plane measurement.

[0057] When the outer layer base material 11 is a film, the film can be produced by known production methods such as a casting method or an inflation method. The outer layer base material 11 may be a polyethylene film with a multilayer structure obtained by co-extrusion of polyethylenes with different densities. A stretched film can be obtained, for example, by stretching a film obtained by forming polyethylene into a film by a T-die method or an inflation method.

[0058] The haze of the outer layer base material 11 is preferably 20% or less, and more preferably 10% or less. The haze is measured by a method in accordance with JIS K7136:2000.

[0059] When an adhesive layer is provided on the surface of the outer layer base material 11, various pretreatments such as corona treatment, plasma treatment, ozone treatment, and flame treatment may be performed on the surface on the adhesive layer side in order to enhance adhesion to the adhesive layer, or a coating layer such as an easy-adhesion layer may be provided.

[0060] The thickness of the outer layer base material 11 is not particularly limited and is, for example, 10 μm or more and 100 μm or less. From the perspective of reducing material usage to reduce environmental impact and from the perspective of obtaining excellent heat resistance, impact resistance, and gas barrier properties, the thickness of the outer layer base material 11 may be 15 μm or more, 20 μm or more, 25 μm or more, 30 μm or more, or 40 μm or more. The thickness of the outer layer base material 11 may also be 60 μm or less, or 50 μm or less.

[0061] The outer layer base material 11 may be colored, for example, white.

[0062] (sealant layer) The sealant layer 13 is made of a polyolefin resin film, and the polyolefin resin film contains a resin made of a polyolefin resin. As the polyolefin resin, the same resin as that used in the outer layer base material 11 can be used.

[0063] The sealant layer 13 preferably has a melting point lower than that of the outer layer base material 11. In this case, when the laminate 10 is heat-sealed, it is possible to heat-seal the sealant layer 13 while suppressing melting of the outer layer base material 11.

[0064] The sealant layer 13 may further contain additives such as a flame retardant, a slip agent, an antiblocking agent, an antioxidant, a light stabilizer, a tackifier, an antistatic agent, and a light-shielding pigment, as required.

[0065] The sealant layer 13 may be composed of a single layer or multiple layers. When the sealant layer 13 is composed of a single layer, the sealant layer 13 may be a recycled polyolefin resin film or a non-recycled polyolefin resin film. When the recycled polyolefin resin film contains a chemically recycled polyolefin resin, although the chemically recycled polyolefin resin is superior in terms of hygiene and strength, if there is psychological resistance to the recycled polyolefin resin film coming into contact with the contents, the sealant layer 13 is preferably a non-recycled polyolefin resin film. When contents are placed in a packaging container obtained using the laminate 10, the sealant layer 13 is the layer that comes into contact with the contents. When the sealant layer 13 is a non-recycled polyolefin resin film, the possibility of impurities and foreign matter such as gels and aggregates migrating to the contents upon heating during retort or boiling treatment of the packaging container can be further reduced. Therefore, the laminate 10 can be used safely to package contents such as food.

[0066] When the sealant layer 13 is composed of multiple layers, all of the layers may be recycled polyolefin resin films, or non-recycled polyolefin resin films, or some of the layers may be non-recycled polyolefin resin films and the rest may be recycled polyolefin resin films.

[0067] When at least some of the layers in the sealant layer 13 are made of a non-recycled polyolefin resin film, it is preferable that the layer located farthest from the outer layer base material 11 is a non-recycled polyolefin resin film.

[0068] The layer of the sealant layer 13 located farthest from the outer layer base material 11 is the layer that comes into contact with the contents when the contents are placed in a packaging container obtained using the laminate 10. If this layer is a non-recycled polyolefin resin film, the possibility of impurities and foreign matter such as gels and aggregates being transferred to the contents as a result of heating during retort or boiling treatment of the packaging container can be further reduced. For this reason, the laminate 10 can be used safely to package contents such as food.

[0069] When the plurality of layers is three layers, the plurality of layers may be composed of a first outer layer, a middle layer, and a second outer layer. Here, the first outer layer and the second outer layer may be made of a non-recycled polyolefin resin film, and the intermediate layer may be made of a recycled polyolefin resin film.

[0070] When the sealant layer 13 contains a light-shielding pigment, the sealant layer 13 can function as a light-shielding layer. For example, a white sealant containing a titanium oxide-based white pigment can be used as the sealant layer 13. Note that the sealant layer 13 is not limited to a white sealant, and may be composed of a sealant of another color by containing a pigment other than the white pigment. The sealant layer may be black, gray, sepia, etc. If the sealant layer is opaque, it may have a single opaque layer, two or more opaque layers, or a combination of transparent and opaque layers. The sealant layer can be colored white, gray, black, or the like by mixing a pigment or the like into the material resin constituting the sealant layer. For example, the sealant layer becomes white when titanium oxide is mixed into the material resin, becomes black when carbon black is mixed, and becomes gray when both titanium oxide and carbon black are mixed. The black, gray, or sepia color of the sealant layer improves the light-blocking properties. When the sealant layer has excellent light-blocking properties, the sealant layer contains, for example, carbon black.

[0071] The sealant layer may be a non-stretched polyolefin resin film, or may be a layer formed by melt-extrusion of polyolefin.

[0072] The thickness of the sealant layer 13 is not particularly limited and may be adjusted appropriately depending on the application of the laminate 10. The thickness of the sealant layer 13 may be, for example, 10 μm or more, 25 μm or more, 30 μm or more, 40 μm or more, or 50 μm or more. The thickness of the sealant layer 13 may also be 250 μm or less, 200 μm or less, 150 μm or less, or 100 μm or less.

[0073] (intermediate substrate) The intermediate base material 12 is a base material that reinforces the outer layer base material 11, and can further improve the strength of the laminate 10. The intermediate base material 12 is made of a polyolefin resin film, and the polyolefin resin film contains a resin made of a polyolefin resin. As the polyolefin resin, the same resin as that used in the outer layer base material 11 can be used.

[0074] The intermediate substrate 12 may be a single layer or a laminate of multiple layers. When the intermediate substrate 12 is composed of a single layer, the intermediate substrate 12 may be a recycled polyolefin resin film or a non-recycled polyolefin resin film. When the intermediate substrate 12 is composed of multiple layers, all of the layers may be recycled polyolefin resin films, or non-recycled polyolefin resin films, or some of the layers may be non-recycled polyolefin resin films and the remaining layers may be recycled polyolefin resin films. Note that materials other than those mentioned above can be used for the intermediate substrate 12 as long as the recycled resin content in the standing pouch is 10% by volume or more or 10% by mass or more. For example, polyethylene terephthalate resin can be used for the intermediate substrate 12, although the olefin resin ratio in the packaging material is reduced. Furthermore, if polyethylene terephthalate resin produced by chemical recycling is used as the material for the intermediate substrate 12, the recycled resin content can be increased. Furthermore, nylon resin film or the like can also be used as the intermediate substrate 12. Furthermore, nylon resin film produced by chemical recycling may be used as the nylon resin film.

[0075] When the plurality of layers is three layers, the plurality of layers may be composed of a first outer layer, a middle layer, and a second outer layer. Here, the first and second outer layers may be made of non-recycled polyolefin resin films, and the intermediate layer may be made of recycled polyolefin resin film. In this case, the possibility that impurities and foreign matter such as gels and aggregates will migrate from intermediate substrate 12 through sealant layer 13 to the contents as a result of heating during retort or boiling treatment of the packaging container can be further reduced. Therefore, laminate 10 can be used safely to package contents such as food.

[0076] The thickness of the intermediate substrate 12 is not particularly limited and is adjusted appropriately depending on the application of the laminate 10. The thickness of the intermediate substrate 12 may be, for example, 10 μm or more, 25 μm or more, 30 μm or more, 40 μm or more, or 50 μm or more. The thickness of the intermediate substrate 12 may also be 100 μm or less, 80 μm or less, 60 μm or less, or 50 μm or less.

[0077] (adhesive layer) Examples of the adhesive layer include an adhesive layer formed using an adhesive agent and an adhesive layer containing an adhesive resin (hereinafter also referred to as an "adhesive resin layer").

[0078] Examples of adhesives include known adhesives such as urethane adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and isocyanate adhesives.

[0079] The adhesive may or may not contain a biomass-derived component, but preferably contains a biomass-derived component from the viewpoint of reducing the environmental impact. Specific examples of biomass-derived components include the "DIC Dry BM Series" manufactured by DIC Corporation and the "ECOAD Series" manufactured by Toyo Ink Co., Ltd.

[0080] The adhesive is preferably a polyamine-based adhesive or a urethane-based adhesive having gas barrier properties. Specific examples of gas barrier adhesives include "Maxieve" manufactured by Mitsubishi Gas Chemical Company, Inc. and "Paslim" manufactured by DIC Corporation.

[0081] The adhesive may be an adhesive containing an organic solvent or an adhesive containing no organic solvent, but from the viewpoint of reducing the environmental load, an adhesive containing no organic solvent (solvent-free adhesive) is preferred.

[0082] The adhesive layer may be a cured product of a resin composition containing a polyester polyol and an isocyanate compound, or may be a cured product of a resin composition further containing a phosphoric acid-modified compound as needed. Among the resin compositions used for such adhesive layers, for example, a polyol as the base agent and an isocyanate compound as the curing agent, or a polyamine resin as the base agent and an epoxy compound as the curing agent, it is preferable that either or both of the base agent and the curing agent have not only a linear structure but also a curved structure, or contain units capable of forming such a structure. For example, by incorporating a compound having a substituent at the ortho- or meta-position of the aromatic ring into these structures, it is possible to form not only a linear crosslink but also a curved crosslinked structure in the cured coating. This curved crosslinked structure controls the molecular orientation, thereby contributing to oxygen barrier properties and water vapor barrier properties. The resin composition may also contain an inorganic compound, such as an inorganic layered compound, to further improve barrier properties. This can further improve the oxygen barrier properties and water vapor barrier properties of the laminate.

[0083] The adhesive layer can be formed by applying and drying the adhesive layer onto the intermediate layer or the sealant layer using a conventionally known method such as direct gravure roll coating, gravure roll coating, kiss coating, reverse roll coating, Fontaine method, or transfer roll coating.

[0084] The adhesive resin layer may be an extruded or non-extruded resin layer. The adhesive resin is a heat-sealable adhesive thermoplastic resin that can be melted by heat and fused to each other. For example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, methylpentene polymer, acid-modified polyolefin resins obtained by modifying polyolefin resins such as polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and the like can be used.

[0085] The thickness of the adhesive layer is not particularly limited and may be, for example, 0.1 μm or more. By making the thickness of the adhesive layer 1 μm or more, sufficient adhesive strength can be obtained. The thickness of the adhesive layer may be 2 μm or more. The thickness of the adhesive layer may be 50 μm or less, 5 μm or less, or 3 μm or less.

[0086] (Printing layer) The printed layer 15 may be provided between layers in the laminate 10, or may be provided on the outside as shown in FIG. 6 . When the printed layer 15 is provided between layers, the printed layer 15 is provided, for example, on the surface opposite the sealant layer 13 (the outer surface). The printed layer 15 may also be provided on the surface of the outer layer base material 11 facing the sealant layer 13 (the inner surface). When the printed layer 15 is provided on the inner surface of the outer layer base material 11, the printed layer 15 is protected by the outer layer base material 11, preventing deterioration of the printed layer 15. When the printed layer 15 is provided on the outer surface of the outer layer base material 11 and becomes the outermost layer of the laminate 10 as shown in FIG. 6 , the printed layer 15 can be easily removed when recycling a package containing the laminate 10 after disposal. Furthermore, when the laminate 10 includes an intermediate base material 12, the printed layer 15 may be provided on the intermediate base material 12. Here, the printed layer 15 may be provided between the outer layer substrate 11 and the intermediate substrate 12 , or may be provided between the intermediate substrate 12 and the sealant layer 13 .

[0087] The print layer 15 is a layer that displays characters, pictures, etc., and can be formed using ink. As the ink, for example, inks obtained by adding various pigments, plasticizers, drying agents, stabilizers, etc. to a binder resin such as a urethane-based, acrylic-based, nitrocellulose-based, or rubber-based ink can be used.

[0088] The ink may be either a water-based ink or an oil-based ink, but is preferably a water-based ink. A water-based ink uses water or alcohol as a solvent, which can further reduce the environmental impact. In particular, when the adhesive is a solventless adhesive, using a water-based ink as the ink can significantly reduce the environmental impact. Furthermore, the ink may or may not be a biomass ink, but from the perspective of reducing the environmental impact, a biomass ink is preferred. Here, biomass ink refers to an ink containing components obtained from biological resources (biomass), such as cotton, pulp, rice bran, vegetable oil, and angiosperm seeds. The ink may be recycled ink, which is made by collecting and recycling used ink, or may be non-recycled ink, but recycled ink is preferred from the viewpoint of environmental impact.

[0089] Furthermore, an easily recyclable ink can also be used as the ink. By using an easily recyclable ink, it becomes possible to easily recycle the packaging including the laminate 10 after it has been discarded. Specifically, an example of an easily recyclable ink is "SunSpectro Solvawash" manufactured by DIC Corporation.

[0090] (gas barrier layer) As shown in Fig. 6, the laminate 10 may include a gas barrier layer 16 in addition to the printed layer 15. The gas barrier layer 16 may be provided on at least one surface of the outer layer substrate 11. Furthermore, when the laminate 10 includes an intermediate substrate 12, the gas barrier layer 16 may be provided on at least one surface of the intermediate substrate 12, as shown in Fig. 6. The gas barrier layer 16 is a layer that improves the gas barrier properties of the laminate 10. The gas barrier layer 16 has a barrier property against gases such as water vapor or oxygen.

[0091] The gas barrier layer 16 may be, for example, a vapor deposition layer such as a metal vapor deposition layer or an inorganic compound vapor deposition layer. Metals include aluminum and silicon. Inorganic oxides include aluminum oxide and silicon oxide (silica). When the gas barrier layer 16 is a vapor-deposited layer of a metal such as aluminum, the gas barrier layer 16 can function as a light-shielding layer and a glossy layer.

[0092] The thickness of the vapor-deposited layer is preferably 5 to 85 nm. When the thickness is 5 nm or more, sufficient gas barrier properties can be obtained. Furthermore, when the thickness is 85 nm or less, the occurrence of cracks due to deformation caused by internal stress in the thin film can be suppressed, and deterioration of gas barrier properties can be suppressed. From the same viewpoint as above, the thickness of the vapor-deposited layer made of metal or metal oxide is more preferably 10 to 80 nm. Even a very thin layer that does not affect the recyclability of the standing pouch has excellent light-blocking properties, gloss, and barrier properties.

[0093] The gas barrier layer 16 can be formed by, for example, vacuum film formation. Physical vapor deposition or chemical vapor deposition can be used for vacuum film formation. Examples of physical vapor deposition include vacuum deposition, sputtering, and ion plating. Examples of chemical vapor deposition include thermal CVD (Chemical Vapor Deposition), plasma CVD, and photo CVD.

[0094] In vacuum film formation, resistance heating vacuum deposition, EB (Electron Beam) heating vacuum deposition, induction heating vacuum deposition, sputtering, reactive sputtering, dual magnetron sputtering, and plasma enhanced chemical vapor deposition (PECVD) are particularly preferred. Vacuum deposition is preferred from the viewpoint of excellent productivity. As a heating means for vacuum deposition, it is preferred to use any one of electron beam heating, resistance heating, and induction heating.

[0095] The gas barrier layer 16 may further include an overcoat layer on the vapor deposition layer. The overcoat layer may be a coating layer obtained using a composition containing a water-soluble polymer and silicon alkoxide, or a coating layer made of a resin such as urethane.

[0096] The overcoat layer further improves the oxygen barrier property and water vapor barrier property of the laminate. The gas barrier layer 16 may comprise only a vapor deposition layer, or only an overcoat layer. The laminate may or may not have a gas barrier layer.

[0097] The overcoat layer can be formed, for example, by applying a coating liquid. The coating liquid may contain a resin such as polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, polyvinylidene chloride, polyacrylonitrile, or epoxy resin. The coating liquid may contain additives such as organic particles, inorganic particles, layered compounds, and curing agents.

[0098] The overcoat layer may be, for example, an organic-inorganic composite layer containing at least one selected from the group consisting of a metal alkoxide, a hydrolyzate of a metal alkoxide, a metal alkoxide, and a reaction product of a hydrolyzate of a metal alkoxide, and a water-soluble polymer. This organic-inorganic composite layer may further contain at least one selected from the group consisting of a silane coupling agent, a hydrolyzate of a silane coupling agent, a silane coupling agent, and a reaction product of a hydrolyzate of a silane coupling agent.

[0099] Examples of metal alkoxides and their hydrolysates include compounds represented by the general formula M(OR), such as tetraethoxysilane [Si(OC2H5)4] and triisopropoxyaluminum [Al(OC3H7)3]. n The metal alkoxides and hydrolysates thereof may be used singly or in combination of two or more.

[0100] The content of the metal alkoxide, its hydrolysate, and their reaction products in the coating liquid used to form the overcoat layer may be, for example, 40% by mass or more, 50% by mass or more, or 65% by mass or more, from the viewpoint of excellent oxygen barrier property. Furthermore, the total content of the metal alkoxide, its hydrolysate, and their reaction products in the coating liquid may be, for example, 70% by mass or less.

[0101] The water-soluble polymer contained in the overcoat layer is not particularly limited, and examples thereof include polyvinyl alcohol-based polymers, polysaccharides such as starch, methyl cellulose, and carboxymethyl cellulose, and hydroxyl group-containing polymers such as acrylic polyol-based polymers. From the viewpoint of further improving oxygen gas barrier properties, the water-soluble polymer preferably includes a polyvinyl alcohol-based water-soluble polymer. The number-average molecular weight of the water-soluble polymer may be, for example, 40,000 to 180,000.

[0102] The polyvinyl alcohol-based water-soluble polymer contained in the overcoat layer can be obtained, for example, by saponifying (including partial saponification) polyvinyl acetate. This water-soluble polymer may have several tens of percent or only a few percent of acetate groups remaining.

[0103] The content of the water-soluble polymer in the coating liquid used to form the overcoat layer may be, for example, 15% by mass or more, or 20% by mass or more, based on the total mass of the organic-inorganic composite layer, from the viewpoint of excellent oxygen barrier properties. Also, the content of the water-soluble polymer in the coating liquid may be, for example, 50% by mass or less, or 45% by mass or less, from the viewpoint of excellent oxygen barrier properties.

[0104] The silane coupling agent used in the overcoat layer may be a silane coupling agent having an organic functional group. Examples of such silane coupling agents include ethyltrimethoxysilane, vinyltrimethoxysilane, γ-chloropropylmethyldimethoxysilane, γ-chloropropyltrimethoxysilane, glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and γ-methacryloxypropylmethyldimethoxysilane. The silane coupling agents selected from these, their hydrolyzates, and their reaction products may be used alone or in combination of two or more.

[0105] It is preferable to use a silane coupling agent having an epoxy group as the organic functional group. Examples of silane coupling agents having an epoxy group include γ-glycidoxypropyltrimethoxysilane and β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane. The silane coupling agent having an epoxy group may have an organic functional group other than the epoxy group, such as a vinyl group, an amino group, a methacryl group, a ureyl group, or an isocyanate group. These may also be derivatized, multifunctionalized, or composited. One of the silane coupling agents selected from these, their hydrolyzates, and their reaction products may be used alone or in combination of two or more.

[0106] A silane coupling agent having an organic functional group, its hydrolyzate, or a reaction product thereof can further improve the oxygen barrier property of the overcoat layer and the adhesion to an adjacent layer through the interaction between the organic functional group and the hydroxyl group of the water-soluble polymer. In particular, when the silane coupling agent, its hydrolyzate, or a reaction product thereof has an epoxy group and the water-soluble polymer is polyvinyl alcohol (PVA), the interaction between the epoxy group and the hydroxyl group of the PVA can further improve the oxygen barrier property and the adhesion to an adjacent layer.

[0107] The total content of the silane coupling agent, its hydrolysate, and their reaction products in the coating liquid used to form the overcoat layer may be, for example, 1% by mass or more, or 2% by mass or more, based on the total mass of the organic-inorganic composite layer, from the viewpoint of excellent oxygen barrier property. Also, the total content of the silane coupling agent, its hydrolysate, and their reaction products in the coating liquid may be, for example, 15% by mass or less, or 12% by mass or less, from the viewpoint of excellent oxygen barrier property.

[0108] (Anchor coat layer) The laminate may further include an anchor coat layer on the surface of the outer substrate on which the vapor-deposited layer is formed, or on the surface of the intermediate substrate on which the vapor-deposited layer is formed.

[0109] The anchor coat layer can be formed using a known anchor coat agent. This can improve the adhesion between layers, for example, between an intermediate substrate and a metal vapor deposition layer or an inorganic compound vapor deposition layer. Examples of anchor coat agents include polyester-based polyurethane resins and polyether-based polyurethane resins. The anchor coat layer can also be a polyurethane-based cured coating obtained by reacting an isocyanate compound with various hydroxyl group-containing polymers such as polyester polyols, polyether polyols, and acrylic polyols. To improve the adhesion between the substrate and the vapor deposition layer, the anchor coat agent can be blended with the above-mentioned silane coupling agent. From the viewpoints of heat resistance and interlayer adhesive strength, the anchor coat agent is preferably a polyester-based polyurethane resin.

[0110] (protective layer) The protective layer is the outermost layer of the laminate, and covers the surface of the outer layer base material opposite to the sealant layer. The laminate does not necessarily have to have a protective layer.

[0111] The protective layer may contain a cured product of a thermosetting resin. The thermosetting resin is not particularly limited as long as it produces a cured product having heat resistance, and examples thereof include polyurethane resin, polyester resin, polyamide resin, polyamideimide resin, acrylic resin, epoxy resin, and water-soluble polymer. The cured product of the thermosetting resin may be used alone or in combination of two or more. The protective layer may contain an inorganic filler, for example, from the viewpoint of improving heat resistance.

[0112] In one embodiment, the protective layer preferably contains a water-soluble polymer, and more preferably is an organic-inorganic composite layer that further contains an organometallic compound.

[0113] Examples of water-soluble polymers include polyvinyl alcohols, polysaccharides such as starch, methyl cellulose, and carboxymethyl cellulose, and hydroxyl group-containing polymers such as acrylic polyols. The protective layer preferably contains, for example, a polyvinyl alcohol-based hydroxyl group-containing polymer that may be contained in the coating layer.

[0114] The protective layer preferably contains at least one organic metal compound selected from the group consisting of metal alkoxides, hydrolyzates of metal alkoxides, metal alkoxides, and reaction products of hydrolyzates of metal alkoxides. Examples of the metal alkoxides include those represented by the general formula M(OR), such as tetraethoxysilane [Si(OC2H5)4] and triisopropoxyaluminum [Al(OC3H7)3]. n Examples include those represented by the following formula:

[0115] It is preferable that the protective layer further contains, as an organometallic compound, at least one selected from the group consisting of a silane coupling agent, a hydrolysate of a silane coupling agent, and a reaction product of a silane coupling agent and a hydrolysate of a silane coupling agent.

[0116] The protective layer can be formed, for example, using a coating liquid for forming the coating layer. When the laminate has a coating layer, the protective layer may be a layer formed using the same coating liquid as the coating liquid used to form the coating layer. The protective layer is not limited to methods using a coating liquid, and can also be formed by co-extrusion of the polyethylene resin that constitutes the outer layer base material 11 with a thermoplastic resin that has a high melting point and is heat-resistant, such as a polyester resin, a polyamide resin, a polypropylene resin, or a polymethylpentene resin.

[0117] The protective layer reduces thermal damage to the surface of the laminate during heat sealing. By providing the laminate with a protective layer with excellent heat resistance as the outermost layer, it is possible to ensure heat sealing properties and productivity even when the base material is polyethylene resin, which has poor heat resistance. The protective layer not only prevents defects during bag manufacturing by imparting heat resistance to the outer layer base material, but is also expected to have the effect of preventing pinholes during transportation.

[0118] The thickness of the protective layer is preferably 0.3 to 3 μm. When the protective layer is 0.3 μm or more, it tends to have sufficient heat resistance. When the protective layer is 3 μm or less, it becomes easier to sufficiently dry the cured resin film during the manufacturing process of the main body film 111.

[0119] (Other layers) The laminate 10 may further include a layer containing a resin other than polyolefin resin (non-polyolefin resin) as long as the recycled resin content is 10% by volume or more or 10% by mass or more. Examples of non-polyolefin resins include polyamide resins such as nylon, and polyester resins such as polyethylene terephthalate (PET).

[0120] When the laminate 10 includes an outer layer substrate 11, an intermediate substrate 12, and a sealant layer 13, it is preferable that the outer layer substrate 11 and the sealant layer 13 are made of a non-recycled polyolefin resin film, and the intermediate substrate 12 includes a recycled polyolefin resin film. In this case, even if the intermediate substrate 12 contains impurities or foreign matter such as gels or aggregates, because the intermediate substrate 12 is sandwiched between the outer layer substrate 11 and the sealant layer 13, even if impurities or foreign matter such as gels or aggregates are present in the intermediate substrate 12, the impurities or foreign matter such as gels or aggregates are unlikely to appear outside the standing pouch 110. Furthermore, when the laminate 10 includes an outer layer base material 11 and a sealant layer 13, at least one of the outer layer base material 11 and the sealant layer 13 may be a recycled polyolefin resin film.

[0121] The embodiments of the present disclosure have been described above, and the outline of the present disclosure is as follows. [1] A standing pouch formed by heat-sealing a pair of main films and a bottom film having a mountain fold, The pair of main films each include an outer layer base material and a sealant layer, The bottom film comprises an outer layer substrate and a sealant layer, In the pair of main film and bottom film, the outer layer base material and the sealant layer are polyolefin resin films, The pair of main body films and the bottom film contain recycled resin, The content of recycled resin in the standing pouch is 10% by volume or more or 10% by mass or more, A standing pouch, wherein the recycled resin is a chemically recycled resin. [2] The standing pouch according to [1], wherein the content of recycled resin in the pair of main body films and the bottom film is 20% by volume or more or 20% by mass or more, respectively. [3] The standing pouch according to [1] or [2], wherein the pair of main body films and the bottom film further comprise an intermediate substrate between the outer layer substrate and the sealant layer. [4] The standing pouch according to any one of [1] to [3], wherein the recycled resin is a post-consumer recycled resin. [5] The standing pouch according to any one of [1] to [4], wherein the content of the polyolefin resin in the standing pouch is 80% by volume or more or 80% by mass or more, respectively. [6] The standing pouch according to any one of [1] to [5], wherein the outer layer base material and the sealant layer of the pair of main body films and the bottom film are made of the same material. [7] The standing pouch according to any one of [1] to [6], wherein the pair of main body films and the sealant layer of the bottom film are petroleum-derived or biomass-derived polyolefin resin films. [8] A standing pouch according to any one of [1] to [7], wherein the sealant layer of the pair of main film and bottom film is composed of multiple layers, and the layer located farthest from the outer layer substrate is a non-recycled polyolefin resin film. [9] The standing pouch according to any one of [1] to [8], wherein the pair of main body films and the bottom film further comprise a gas barrier layer between the outer layer base material and the sealant layer.

[10] A standing pouch according to any one of [1] to [9], Contents contained in the standing pouch; A packaging article comprising: [Example]

[0122] The present disclosure will be explained in more detail below with reference to examples, but the present disclosure is not limited to these examples.

[0123] [Standing pouch production] Example 1 (Main film) The following materials were prepared: (material) Outer layer substrate: A biaxially oriented HDPE film (25 μm thick) with three layers in this order: a first outer layer (2 μm thick), an intermediate layer (21 μm thick), and a second outer layer (2 μm thick). The first and second outer layers are petroleum-derived. The intermediate layer contains 100% by volume of chemically recycled polyethylene using PCR. Intermediate substrate: an unstretched HDPE film (32 μm thick) having three layers in this order: a first outer layer (3 μm thick), a middle layer (26 μm thick), and a second outer layer (3 μm thick). All three layers are petroleum-derived. Sealant layer: an unstretched LLDPE film (100 μm thick) comprising three layers in this order: a first outer layer (25 μm thick), a middle layer (50 μm thick), and a second outer layer (25 μm thick), all of which are petroleum-derived.

[0124] A printed layer (1 μm thick) was formed on one surface of the outer layer substrate using water-based flexographic ink. A dry laminating adhesive (urethane adhesive) was applied to the surface of the printed layer to form a first adhesive layer 3 μm thick (dry film thickness), and the intermediate substrate was attached using the first adhesive layer. Next, a dry lamination adhesive (urethane adhesive) was applied to the surface of the intermediate substrate to form a second adhesive layer 3 μm thick (dry film thickness). A sealant layer was then attached to the second adhesive layer. This produced a laminate for the main film (outer layer substrate / printed layer / first adhesive layer / intermediate substrate / second adhesive layer / sealant layer). Two laminates for the main film were produced.

[0125] (Bottom film) The same outer layer substrate, intermediate substrate, and sealant layer as those for the main body film were prepared as the materials for the bottom film. Then, a laminate for the bottom film (outer layer substrate / printing layer / first adhesive layer / intermediate substrate / second adhesive layer / sealant layer) was produced in the same manner as for the main body film.

[0126] A mountain fold was formed in the bottom film. The pair of main films and the bottom film with the mountain fold were heat-sealed to obtain a standing pouch measuring 240 mm in height, 160 mm in width, and 40 mm in bottom fold.

[0127] <Example 2> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: A biaxially oriented OPP film (20 μm thick) with three layers in this order: a first outer layer (1 μm thick), an intermediate layer (18 μm thick), and a second outer layer (1 μm thick). The first and second outer layers are petroleum-derived. The intermediate layer contains 100% by volume of chemically recycled polypropylene using PCR. Intermediate substrate: a biaxially stretched OPP film (20 μm thick) having three layers in this order: a first outer layer (1 μm thick), an intermediate layer (18 μm thick), and a second outer layer (1 μm thick). All three layers are petroleum-derived. Sealant layer: an unstretched CPP film (60 μm thick) comprising three layers in this order: a first outer layer (15 μm thick), a middle layer (30 μm thick), and a second outer layer (15 μm thick), all of which are petroleum-derived.

[0128] Example 3 A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially oriented HDPE film (25 μm thick) having three layers in this order: a first outer layer (2 μm thick), a middle layer (21 μm thick), and a second outer layer (2 μm thick). All three layers are petroleum-derived. Intermediate substrate: Unstretched HDPE film (32 μm thick) with three layers in this order: a first outer layer (3 μm thick), an intermediate layer (26 μm thick), and a second outer layer (3 μm thick). The first and second outer layers are petroleum-derived. The intermediate layer contains 100% by volume of chemically recycled polyethylene using PCR. Sealant layer: an unstretched LLDPE film (100 μm thick) comprising three layers in this order: a first outer layer (25 μm thick), a middle layer (50 μm thick), and a second outer layer (25 μm thick), all of which are petroleum-derived.

[0129] Example 4 A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a petroleum-derived biaxially stretched OPP film (thickness 20 μm) having three layers in this order: a first outer layer (thickness 1 μm), an intermediate layer (thickness 18 μm), and a second outer layer (thickness 1 μm). All three layers are petroleum-derived. Intermediate substrate: A biaxially oriented OPP film (20 μm thick) with three layers in this order: a first outer layer (1 μm thick), an intermediate layer (18 μm thick), and a second outer layer (1 μm thick). The first and second outer layers are petroleum-derived. The intermediate layer contains 100% by volume of chemically recycled polypropylene using PCR. Sealant layer: a petroleum-derived unstretched CPP film (60 μm thick) having three layers in this order: a first outer layer (15 μm thick), a middle layer (30 μm thick), and a second outer layer (15 μm thick). All three layers are petroleum-derived.

[0130] <Example 5> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially oriented HDPE film (25 μm thick) having three layers in this order: a first outer layer (2 μm thick), a middle layer (21 μm thick), and a second outer layer (2 μm thick). All three layers are petroleum-derived. Intermediate substrate: an unstretched HDPE film (32 μm thick) having three layers in this order: a first outer layer (3 μm thick), a middle layer (26 μm thick), and a second outer layer (3 μm thick). All three layers are petroleum-derived. Sealant layer: An unstretched LLDPE film (100 μm thick) with three layers in this order: a first outer layer (25 μm thick), a middle layer (50 μm thick), and a second outer layer (25 μm thick). The first and second outer layers are petroleum-derived. The middle layer contains 100% by volume of chemically recycled polyethylene using PCR.

[0131] Example 6 A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially stretched OPP film (thickness 20 μm) having three layers in this order: a first outer layer (thickness 1 μm), an intermediate layer (thickness 18 μm), and a second outer layer (thickness 1 μm). All three layers are petroleum-derived. Intermediate substrate: a biaxially stretched OPP film (20 μm thick) having three layers in this order: a first outer layer (1 μm thick), an intermediate layer (18 μm thick), and a second outer layer (1 μm thick). All three layers are petroleum-derived. Sealant layer: An unstretched CPP film (60 μm thick) with three layers in this order: a first outer layer (15 μm thick), a middle layer (30 μm thick), and a second outer layer (15 μm thick). The first and second outer layers are petroleum-derived. The middle layer contains 100% by volume of chemically recycled polypropylene using PCR.

[0132] <Comparative Example 1> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: A biaxially oriented HDPE film (25 μm thick) with three layers in this order: a first outer layer (2 μm thick), an intermediate layer (21 μm thick), and a second outer layer (2 μm thick). The first and second outer layers are petroleum-derived. The intermediate layer contains 100% by volume of polyethylene recycled using PCR. Intermediate substrate: an unstretched HDPE film (32 μm thick) having three layers in this order: a first outer layer (3 μm thick), a middle layer (26 μm thick), and a second outer layer (3 μm thick). All three layers are petroleum-derived. Sealant layer: an unstretched LLDPE film (100 μm thick) comprising three layers in this order: a first outer layer (25 μm thick), a middle layer (50 μm thick), and a second outer layer (25 μm thick), all of which are petroleum-derived.

[0133] <Comparative Example 2> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: A biaxially oriented OPP film (20 μm thick) consisting of three layers in this order: a first outer layer (1 μm thick), an intermediate layer (18 μm thick), and a second outer layer (1 μm thick). The first and second outer layers are petroleum-derived. The intermediate layer contains 100% by volume of polypropylene recycled using PCR. Intermediate substrate: a biaxially stretched OPP film (20 μm thick) having three layers in this order: a first outer layer (1 μm thick), an intermediate layer (18 μm thick), and a second outer layer (1 μm thick). All three layers are petroleum-derived. Sealant layer: an unstretched CPP film (60 μm thick) comprising three layers in this order: a first outer layer (15 μm thick), a middle layer (30 μm thick), and a second outer layer (15 μm thick), all of which are petroleum-derived.

[0134] <Comparative Example 3> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially oriented HDPE film (25 μm thick) having three layers in this order: a first outer layer (2 μm thick), a middle layer (21 μm thick), and a second outer layer (2 μm thick). All three layers are petroleum-derived. Intermediate substrate: Unstretched HDPE film (32 μm thick) with three layers in this order: a first outer layer (3 μm thick), an intermediate layer (26 μm thick), and a second outer layer (3 μm thick). The first and second outer layers are petroleum-derived. The intermediate layer contains 100% by volume of polyethylene recycled using PCR. Sealant layer: an unstretched LLDPE film (100 μm thick) comprising three layers in this order: a first outer layer (25 μm thick), a middle layer (50 μm thick), and a second outer layer (25 μm thick), all of which are petroleum-derived.

[0135] <Comparative Example 4> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially stretched OPP film (thickness 20 μm) having three layers in this order: a first outer layer (thickness 1 μm), an intermediate layer (thickness 18 μm), and a second outer layer (thickness 1 μm). All three layers are petroleum-derived. Intermediate substrate: A biaxially oriented OPP film (20 μm thick) with three layers in this order: a first outer layer (1 μm thick), an intermediate layer (18 μm thick), and a second outer layer (1 μm thick). The first and second outer layers are petroleum-derived. The intermediate layer contains 100% by volume of polypropylene recycled using PCR. Sealant layer: an unstretched CPP film (60 μm thick) comprising three layers in this order: a first outer layer (15 μm thick), a middle layer (30 μm thick), and a second outer layer (15 μm thick), all of which are petroleum-derived.

[0136] <Comparative Example 5> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially oriented HDPE film (25 μm thick) having three layers in this order: a first outer layer (2 μm thick), a middle layer (21 μm thick), and a second outer layer (2 μm thick). All three layers are petroleum-derived. Intermediate substrate: an unstretched HDPE film (32 μm thick) having three layers in this order: a first outer layer (3 μm thick), a middle layer (26 μm thick), and a second outer layer (3 μm thick). All three layers are petroleum-derived. Sealant layer: An unstretched LLDPE film (100 μm thick) with three layers in this order: a first outer layer (25 μm thick), a middle layer (50 μm thick), and a second outer layer (25 μm thick). The first and second outer layers are petroleum-derived. The middle layer contains 100% by volume of polyethylene recycled using PCR.

[0137] <Comparative Example 6> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially stretched OPP film (thickness 20 μm) having three layers in this order: a first outer layer (thickness 1 μm), an intermediate layer (thickness 18 μm), and a second outer layer (thickness 1 μm). All three layers are petroleum-derived. Intermediate substrate: biaxially stretched OPP film (thickness 20 μm) having three layers in this order: a first outer layer (thickness 1 μm), an intermediate layer (thickness 18 μm), and a second outer layer (thickness 1 μm). All three layers are petroleum-derived. Sealant layer: Unstretched CPP film (60 μm thick) with three layers in this order: a first outer layer (15 μm thick), a middle layer (30 μm thick), and a second outer layer (15 μm thick). The first and second outer layers are petroleum-derived. The middle layer contains 100% by volume of polypropylene recycled using PCR.

[0138] <Reference example 1> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially oriented HDPE film (25 μm thick) having three layers in this order: a first outer layer (2 μm thick), a middle layer (21 μm thick), and a second outer layer (2 μm thick). All three layers are petroleum-derived. Intermediate substrate: an unstretched HDPE film (32 μm thick) having three layers in this order: a first outer layer (3 μm thick), a middle layer (26 μm thick), and a second outer layer (3 μm thick). All three layers are petroleum-derived. Sealant layer: an unstretched LLDPE film (100 μm thick) comprising three layers in this order: a first outer layer (25 μm thick), a middle layer (50 μm thick), and a second outer layer (25 μm thick), all of which are petroleum-derived.

[0139] <Reference example 2> A standing pouch was obtained in the same manner as in Example 1, except that the following materials were used as the materials for the main body film and the bottom film. (material) Outer layer substrate: a biaxially stretched OPP film (thickness 20 μm) having three layers in this order: a first outer layer (thickness 1 μm), an intermediate layer (thickness 18 μm), and a second outer layer (thickness 1 μm). All three layers are petroleum-derived. Intermediate substrate: a biaxially stretched OPP film (20 μm thick) having three layers in this order: a first outer layer (1 μm thick), an intermediate layer (18 μm thick), and a second outer layer (1 μm thick). All three layers are petroleum-derived. Sealant layer: an unstretched CPP film (60 μm thick) comprising three layers in this order: a first outer layer (15 μm thick), a middle layer (30 μm thick), and a second outer layer (15 μm thick), all of which are petroleum-derived.

[0140] <Evaluation> The laminates and standing pouches of the Examples and Comparative Examples prepared as described above were evaluated as follows: Evaluation 1 (fisheyes), Evaluation 2 (odor), Evaluation 3 (strength), and Evaluation 4 (processability). Evaluations 1 and 2 are evaluations related to hygiene.

[0141] (1) Rating 1 (Fisheye) A sample measuring 1m x 1m was cut from the laminate and placed on a black table. Protrusions (protruding foreign matter) with a diameter of 0.5mm or more but less than 1mm were counted visually as fisheye 1 (N1), and protrusions (protruding foreign matter) with a diameter of 1mm or more were counted visually as fisheye 2 (N2), and the evaluation was carried out based on the following evaluation criteria. The results are shown in Table 1. (Evaluation criteria) A N1 is 10 or less and N2 is 0 B: N1 is 11 to 99 and N2 is 0 C: 100 or more N1 or 1 or more N2

[0142] (2) Rating 2 (Odor) The laminate was analyzed using purge-and-trap gas chromatography-mass spectrometry. Specifically, a 1.0 gram sample was cut from the packaging laminate, placed in a 20 mL vial with an odor component collector, and heated at 60°C for 1 hour to adsorb the volatile components from the sample onto the collector. The volatile components in the collector were then analyzed using a purge-and-trap gas chromatography-mass spectrometry system, and a total ion chromatogram was obtained. Next, in the total ion chromatogram obtained as described above, the ratio R1 of the peak area of ​​nonanal to the sum of the peak area values ​​of all aliphatic hydrocarbon components, and the ratio R2 of the peak area of ​​decanal to the sum of the peak area values ​​of all aliphatic hydrocarbon components, were calculated as indicators of odor components. The results were evaluated based on the following criteria: (Evaluation criteria) A R1 is less than 1.5% and R2 is less than 0.35% B: R1 is less than 1.5% and R2 is 0.35% or more, or R1 is 1.5% or more and R2 is less than 0.35% C···R1 is 1.5% or more and R2 is 0.35% or more

[0143] (3) Evaluation 3 (Drop test) The strength of the standing pouches was evaluated. Specifically, 800 ml of 5°C cold water was sealed in the standing pouch to obtain a package. The obtained package was allowed to drop freely from a height of 120 cm 10 times, and the presence or absence of breakage of the bag was confirmed. In each example and comparative example, 30 samples were used. The number of breakages was evaluated according to the following criteria. The results are shown in Table 1. (Evaluation criteria) A: None of the 30 bags were broken. B: One to three bags out of 30 bags were broken. C. More than 4 out of 30 bags were broken.

[0144] (4) Rating 4 (Processability) A sample of the same design, measuring 1m x 1m, was cut out from the main film packaging laminate, placed on a light table, and visually inspected using a magnifying glass for ink loss and adhesive lifting. The results are shown in Table 1. Ink bleeds with a narrower diameter of 0.4 mm or more were considered to be ink bleeds, and adhesive lamination lifting was considered to be appearance defects. The number of such defects was counted and evaluated based on the following evaluation criteria. (Evaluation criteria) A...10 or less B...11~30 pieces C...31 or more

[0145] Table 1 shows the recycled resin content and polyolefin resin content in the standing pouch.

[0146] [Table 1] [Explanation of symbols]

[0147] 11...outer layer substrate, 12...intermediate substrate, 13...sealant layer, 16...gas barrier layer, 10...laminated body, 100...packaged article, 110...standing pouch, 120...contents.

Claims

1. A standing pouch formed by heat-sealing a pair of main films and a bottom film having a mountain fold, The pair of main films each include an outer layer base material and a sealant layer, the bottom film comprises an outer layer substrate and a sealant layer; In the pair of main film and bottom film, the outer layer base material and the sealant layer are polyolefin resin films, The main body film and the bottom film contain recycled resin, The content of recycled resin in the standing pouch is 10% by volume or more or 10% by mass or more, The standing pouch, wherein the recycled resin is a chemical recycled resin.

2. 2. The standing pouch according to claim 1, wherein the content of recycled resin in the pair of main films and the bottom film is 20% by volume or more or 20% by mass or more, respectively.

3. The stand-up pouch according to claim 1 , wherein the pair of main film and bottom film further comprises an intermediate substrate between the outer layer substrate and the sealant layer.

4. 2. The stand-up pouch according to claim 1, wherein the recycled resin is a post-consumer recycled resin.

5. 2. The standing pouch according to claim 1, wherein the content of the polyolefin resin in the standing pouch is 80% by volume or more or 80% by mass or more, respectively.

6. 2. The standing pouch according to claim 1, wherein the outer layer base material and the sealant layer of the pair of main films and the bottom film are made of the same material.

7. 2. The standing pouch according to claim 1, wherein the sealant layers of the pair of main films and the bottom film are petroleum-derived or biomass-derived polyolefin resin films.

8. 2. The standing pouch according to claim 1, wherein the sealant layer of the pair of main film and bottom film is composed of multiple layers, and the layer furthest from the outer layer substrate is a non-recycled polyolefin resin film.

9. The standing pouch according to claim 1 , wherein the pair of main film and bottom film further comprises a gas barrier layer between the outer layer substrate and the sealant layer.

10. The standing pouch according to any one of claims 1 to 9, Contents contained in the standing pouch; A packaging article comprising:

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