Laminates and packaging bags

Abstract

To provide a laminate and a packaging bag that offer not only recyclability but also sufficient tearability.SOLUTION: A laminate 10 comprises a sealant resin layer 11, a biaxially stretched polyethylene resin layer 12, and a stretched polypropylene resin layer 13 in the stated order. The sealant resin layer 11 is a polyethylene resin layer. The biaxially stretched polyethylene resin layer 12 is adjacent to the sealant resin layer 11.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a laminate and a packaging bag.

Background Art

[0002] As a conventional packaging bag, a standing pouch having self-standing property in which a two-folded bottom member is disposed between a pair of body members is used. Paragraph 0010 of Patent Document 1 describes using a laminate film having a sealant as the innermost layer and a stretched film as a base material.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The composite film used in the conventional packaging bag has a heat-sealing resin (sealant) layer such as polyethylene (PE) on the inner surface, and a base material such as polyethylene terephthalate (PET) or nylon (Ny) having higher heat resistance than the sealant is laminated on the outer surface. When heat-sealing the composite film, the sealant is melted and the inner surface of the composite film is joined. However, a packaging bag containing different resins has a problem that it is difficult to recycle as a plastic container packaging.

[0005] In recent years, in order to facilitate recycling, a mono-material container packaging using a single or the same kind of resin has been proposed. For example, using biaxially stretched polypropylene (BO-PP) as a base material is also described in Patent Document 1. However, the combination of BO-PP and PE is less likely to obtain interlayer adhesion than the combination of PET or Ny and PE. Therefore, it is difficult to impart tearability to the composite film.

[0006] This invention has been made in view of the above circumstances, and aims to provide a laminate and packaging bag that are recyclable and also sufficiently easy to tear by hand. [Means for solving the problem]

[0007] The present invention includes the following embodiments. A first aspect of the present invention is a laminate having a sealant resin layer, a biaxially oriented polyethylene resin layer, and an oriented polypropylene resin layer in this order, characterized in that the sealant resin layer is a polyethylene resin layer and the biaxially oriented polyethylene resin layer is adjacent to the sealant resin layer.

[0008] A second aspect of the present invention is a laminate of the first aspect, characterized in that the sealant resin layer is a C6LLDPE layer or a C8LLDPE layer.

[0009] A third aspect of the present invention is a packaging bag characterized in that at least one component is formed from a laminate of the first or second aspect. A fourth aspect of the present invention is a packaging bag according to the third aspect, characterized in that it is a standing pouch. A fifth aspect of the present invention is a packaging bag according to the third or fourth aspect, characterized in that it is used for sealing liquids. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide laminates and packaging bags that offer sufficient tearability in addition to recyclability. [Brief explanation of the drawing]

[0011] [Figure 1] This is a cross-sectional view illustrating an example of the laminate of the embodiment. [Figure 2] This is a plan view illustrating a standing pouch. [Modes for carrying out the invention]

[0012] The present invention will be described below based on preferred embodiments.

[0013] The laminate 10 of the embodiment shown in Figure 1 has a sealant resin layer 11, a biaxially oriented polyethylene resin layer 12, and an oriented polypropylene resin layer 13 in that order. In this laminate 10, the sealant resin layer 11 is a polyethylene resin layer, and the biaxially oriented polyethylene resin layer 12 is adjacent to the sealant resin layer 11.

[0014] When the sealant resin layer 11 is the innermost layer of the laminate 10, it can be used to join the laminate 10 by heat sealing. The sealant resin layer 11 is not particularly limited as long as it is a polyethylene-based resin layer with heat-sealing properties, but it is preferably a C6LLDPE layer or a C8LLDPE layer.

[0015] The C6LLDPE layer is a layer of linear low-density polyethylene (LLDPE) copolymerized with C6 monomers, and the C8LLDPE layer is a layer of linear low-density polyethylene (LLDPE) copolymerized with C8 monomers. Examples of C6 monomers include 1-hexene, and examples of C8 monomers include 1-octene.

[0016] LLDPE generally reduces the density of polyethylene by copolymerizing monomers with 4 to 8 carbon atoms (C4 to C8). C6 and C8 monomers have longer chains than C4 monomers, which tends to increase the strength of the polyethylene.

[0017] The biaxially oriented polyethylene resin layer 12 is a layer of biaxially oriented polyethylene resin (BO-PE). The presence of the biaxially oriented polyethylene resin layer 12 adjacent to the sealant resin layer 11 provides sufficient strength and improves tearability.

[0018] Since both the sealant resin layer 11 and the biaxially stretched polyethylene-based resin layer 12 are polyethylene-based resin layers, the adhesion between the biaxially stretched polyethylene-based resin layer 12 and the sealant resin layer 11 is enhanced. When torn, the sealant resin layer 11 is likely to break following the breakage of the biaxially stretched polyethylene-based resin layer 12, and even when the stretched polypropylene-based resin layer 13 is used as the base material, the tearability of the laminate 10 can be improved.

[0019] The stretching direction, stretching ratio, etc. in the biaxially stretched polyethylene-based resin layer 12 are not particularly limited, but it may be stretched in the conveyance (MD) direction and the cross (TD) direction. The stretching ratio is preferably within the range of 2 to 10 times in both the MD direction and the TD direction. The stretching ratio in the MD direction and the stretching ratio in the TD direction may be equal to each other or different from each other.

[0020] The stretched polypropylene-based resin layer 13 is a layer of stretched polypropylene-based resin (OPP), and more specifically, a uniaxially stretched polypropylene-based resin layer or a biaxially stretched polypropylene-based resin layer can be mentioned.

[0021] The stretched polypropylene-based resin layer 13 may be the outermost layer among the resin layers included in the laminate 10. By arranging the stretched polypropylene-based resin layer 13 having a higher melting point than the sealant resin layer 11 and the biaxially stretched polyethylene-based resin layer 12 on the outside of the laminate 10, the productivity when heat-sealing the laminate 10 using the sealant resin layer 11 can be improved.

[0022] As described above, the combination of stretched PP and PE is difficult to obtain interlayer adhesion, but in the laminate 10 of the embodiment, the biaxially stretched polyethylene-based resin layer 12 is arranged between the stretched polypropylene-based resin layer 13 and the sealant resin layer 11 so as to be adjacent to the sealant resin layer 11. Thereby, the function of the biaxially stretched polyethylene-based resin layer 12 for improving the tearability by adhering to the sealant resin layer 11 and the function of the stretched polypropylene-based resin layer 13 for enhancing the heat resistance can be made compatible.

[0023] The resin film included in the illustrated laminate 10 consists of a sealant resin layer 11, a biaxially oriented polyethylene resin layer 12, and an oriented polypropylene resin layer 13, all of which are made solely of polyolefin resin. The illustrated laminate 10 has three layers of resin film, but the number of resin film layers included in the laminate 10 may be four or more.

[0024] For example, although not specifically shown in the figures, another resin layer may be laminated between the biaxially oriented polyethylene resin layer 12. The other resin layer is preferably a polyolefin resin, and more preferably a polyethylene resin layer or a polypropylene resin layer. If the film contained in the laminate 10 consists only of a polyolefin resin, the recyclability can be improved compared to when PET or Ny is used as the base material.

[0025] The total weight of the polyethylene resin layer in the laminate 10, or the proportion of polyethylene resin in the total resin components, is preferably 80% by weight or more, more preferably 90% by weight or more, and may be 100% by weight. The polyethylene resin layer may contain additives other than the resin components. Examples of the polyethylene resin layer include, but are not limited to, a sealant resin layer 11 and a biaxially oriented polyethylene resin layer 12.

[0026] Furthermore, when a C6LLDPE layer or a C8LLDPE layer is used in the sealant resin layer 11, the proportion of C6LLDPE and / or C8LLDPE in these layers is preferably 80% by weight or more, more preferably 90% by weight or more, and may be 100% by weight.

[0027] The total weight of the polypropylene resin layer in the laminate 10, or the proportion of polypropylene resin in the total resin components, is preferably 80% by weight or more, more preferably 90% by weight or more, and may be 100% by weight. The polypropylene resin layer may contain additives other than the resin components. Here, the polypropylene resin layer is an example of a stretched polypropylene resin layer 13, but is not limited thereto.

[0028] In the illustrated example, the biaxially oriented polyethylene resin layer 12 is joined adjacent to the sealant resin layer 11 via an adhesive layer 14 by dry lamination or the like. Although not specifically shown, the biaxially oriented polyethylene resin layer 12 may also be adjacent to the sealant resin layer 11 without the adhesive layer 14 by co-extrusion, heat lamination, or the like.

[0029] In the illustrated example, the stretched polypropylene resin layer 13 is joined adjacent to the biaxially oriented polyethylene resin layer 12 via an adhesive layer 15. Although not specifically shown, the stretched polypropylene resin layer 13 may also be adjacent to the biaxially oriented polyethylene resin layer 12 without an adhesive layer 15, or via other resin layers as described above.

[0030] The laminate 10 can be a resin film mainly composed of polyolefin resin (polypropylene resin or polyethylene resin), and various other designs are possible in addition to those described above.

[0031] The polyethylene resin may be a homopolymer of ethylene or a copolymer mainly composed of ethylene. Examples of monomers other than ethylene (comonomers) include one or more α-olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. If the polyethylene resin is copolymerized with a monomer having an ester group such as vinyl acetate, some of the ester groups may be saponified to form a copolymer containing vinyl alcohol.

[0032] The proportion of ethylene in the constituent monomers of the polyethylene resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. The ethylene or comonomer may be a compound derived from fossil resources such as petroleum, or a compound derived from biomass such as plants. The resin contained in the polyethylene resin layer may consist solely of polyethylene resin. At least a portion of the polyethylene resin may also contain recycled polyethylene resin.

[0033] The polypropylene resin may be a homopolymer of propylene (homoPP), or a random copolymer (randomPP) or block copolymer (blockPP) of propylene-ethylene copolymer, etc. Examples of monomers other than propylene (comonomers) include one or more of ethylene, α-olefins such as 1-butene, 1-hexene, and 1-octene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When comonomers are used in the polypropylene resin, there may be one or more comonomers.

[0034] The proportion of propylene in the constituent monomers of the polypropylene resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. The propylene or comonomer may be a compound derived from fossil resources such as petroleum, or a compound derived from biomass such as plants. The resin contained in the polypropylene resin layer may consist only of polypropylene resin. At least a portion of the polypropylene resin may also contain recycled polypropylene resin.

[0035] The additives that may be included in each of the above-mentioned resin layers are not particularly limited, but examples include antioxidants, lubricants, antiblocking 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 not compatible with the resin.

[0036] The sealant resin layer 11 is preferably formed from an unstretched polyethylene resin. Specific examples of materials for forming the sealant resin layer 11 include, for example, linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE). The material forming the sealant resin layer 11 may be a single polyethylene resin or a blend of two or more polyethylene resins. The thickness of the sealant resin layer 11 is not particularly limited, but for example, it may be about 60 to 180 μm.

[0037] Specific examples of materials for forming the biaxially oriented polyethylene resin layer 12 include, for example, linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE). The material forming the biaxially oriented polyethylene resin layer 12 may be a single type of polyethylene resin or a blend of two or more types of polyethylene resins. In terms of interlayer peel strength, linear low-density polyethylene (LLDPE), which is less prone to cohesive failure, is preferred.

[0038] The thickness of the biaxially oriented polyethylene resin layer 12 is not particularly limited, but for example, it is about 10 to 50 μm. The surface of the biaxially oriented polyethylene resin layer 12 facing the stretched polypropylene resin layer 13 may have metal deposition or metal oxide deposition. The surface of the biaxially oriented polyethylene resin layer 12 facing the sealant resin layer 11 may be laminated with the sealant resin layer 11 without metal deposition or metal oxide deposition.

[0039] The stretched polypropylene resin layer 13 may be the base material of the laminate 10. The material forming the stretched polypropylene resin layer 13 may be a single type of polypropylene resin or a blend of two or more types of polypropylene resins. When the stretched polypropylene resin layer 13 is used as the surface layer of the laminate 10, homo-PP, which has a high melting point, is preferred from the viewpoint of heat resistance in heat sealing. The thickness of the stretched polypropylene resin layer 13 is not particularly limited, but for example, it may be about 10 to 50 μm.

[0040] The proportion of the sealant resin layer 11 to the thickness of the laminate 10 is preferably 50% or more, and may be around 60%, 70%, 80%, 90%, 95%, or an intermediate value therein. The proportion of the total thickness of the polyolefin resin layers (sealant resin layer 11, biaxially oriented polyethylene resin layer 12, oriented polypropylene resin layer 13, etc.) to the thickness of the laminate 10 is preferably 50% or more, and may be around 60%, 70%, 80%, 90%, 95%, 99%, or an intermediate value therein.

[0041] The adhesive layers 14 and 15 may be formed from an adhesive or from an anchor coating agent. The material used to form the adhesive layers 14 and 15 is not particularly limited, but examples include urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, and organotitanium compounds such as titanium alkoxide. The thickness of the adhesive layers 14 and 15 using adhesives or anchor coating agents can be, for example, about 0.1 to 10 μm, about 1 to 6 μm, or about 3 to 4 μm.

[0042] The adhesive layers 14 and 15 may be formed from an extruded resin. The material of the extruded resin is not particularly limited, but examples include adhesive resins and polyolefin resins. When an extruded resin is used for the adhesive layer 14 between the sealant resin layer 11 and the biaxially oriented polyethylene resin layer 12, a polyethylene resin or a polyethylene-based adhesive resin is preferred. The thickness of the adhesive layers 14 and 15 using the extruded resin can be approximately 3 to 30 μm, 5 to 25 μm, or 7 to 20 μm.

[0043] The laminate 10 may have a printed layer (not shown). For example, a printed layer may be laminated on the inner or outer surface of the stretched polypropylene resin layer 13. A printed layer may be laminated on the outer surface of the biaxially oriented polyethylene resin layer 12. If another resin layer is laminated between the biaxially oriented polyethylene resin layer 12 and the stretched polypropylene resin layer 13, a printed layer may be laminated on the inner or outer surface of the other resin layer.

[0044] The printed layer can be formed by printing ink in a solid or patterned manner using printing methods such as gravure printing, letterpress printing, offset printing, screen printing, and inkjet printing. The thickness of the printed layer is not particularly limited, but is typically around 0.5 to 10 μm. The printed layer may be formed over the entire surface of the laminate or on a portion of the surface of the laminate. Two or more printed layers may be stacked on top of each other. The printed layer may be formed using solvent-based inks or without solvents using EB printing.

[0045] The ink used to form the printed layer may include a coloring agent such as a pigment or dye, and a binder. The binder is not particularly limited, but examples include polyamide, polyurethane, polyester, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, acrylic polymer, polybutadiene, and cyclocompound rubber. In electron beam printing, an acrylic or vinyl resin that can be cured by electron beam is used as at least part of the binder.

[0046] Solvent-based inks may contain solvents such as water, organic solvents, or vegetable oils. After printing with a solvent, the ink can be dried by the evaporation of the solvent or the curing of the ink. Heating or ultraviolet irradiation may be performed to accelerate the drying of the ink. If the ink is solvent-free, printing can be done without heating.

[0047] It is preferable to have a printing layer at the interface between the biaxially oriented polyethylene resin layer 12 and the stretched polypropylene resin layer 13. By forming a printing layer on the stretched resin film, it becomes easier to prevent misalignment in multi-color printing and to control the printing pitch. In addition, the printing layer can be protected by laminating other resin layers on top of the printing layer via an adhesive layer.

[0048] To impart barrier properties to the laminate 10 of the embodiment, a thin film of a metal such as aluminum, or an inorganic compound such as silica or alumina may be laminated. For example, a barrier layer made of the above-mentioned metal or inorganic compound may be formed on at least one side of the biaxially oriented polyethylene resin layer 12 and / or the stretched polypropylene resin layer 13 by vapor deposition, plating, or the like.

[0049] From the viewpoint of interlayer adhesion between the sealant resin layer 11 and the biaxially oriented polyethylene resin layer 12, it is preferable not to form a printed layer or barrier layer between them, but to form a printed layer or barrier layer between the other layers.

[0050] For monomaterial containers and packaging made of polyolefin resin, it is preferable that the total weight of the polyolefin resin is 80% or more by weight of the total weight of the laminate 10, and the total weight of materials other than polyolefin resin is 20% or less by weight, and more preferably that the total weight of the polyolefin resin is 90% or more by weight, and the total weight of materials other than polyolefin resin is 10% or less by weight. This makes it possible to realize a monomaterial material of polyolefin resin even if adhesives, printing inks, etc. are used in the laminate 10.

[0051] The laminate 10 can be used to manufacture packaging bags. The packaging bag only needs to have at least one component made from the laminate 10. The use of the packaging bag is not particularly limited, and can be for disposable use, refilling, storage, or storing goods, but it is particularly suitable for use in refilling a main container used when consuming the contents, either once or multiple times. In this case, the main container can be made durable for long-term use, and the packaging of the refill container can be simplified. In addition, recycling becomes easier when disposing of the refill container after the contents have been used up.

[0052] The laminate 10 may have a portion for opening or cutting the packaging bag. The portion for opening or cutting may have a structure processed in the thickness direction of the film, such as a perforation, notch, or half-cut groove, or it may have a shape that suggests opening or cutting within the surface of the film, such as a thinly protruding spout, or it may be an indication such as an arrow, line, or dot printed on it. Cutting the packaging bag is not limited to cutting the opening portion, but may also be used to cut between or around packaging bags in areas where two or more packaging bags are formed in a continuous manner, or in areas where tags or display portions are continuous around the packaging bag.

[0053] Specific examples of packaging bags are not limited to three-sided sealed bags, four-sided sealed bags, pillow bags, flat bags, gusset bags, and standing pouches. Figure 2 shows an example of a packaging bag 100. The packaging bag 100 is a standing pouch formed from a pair of body members 101 and a bottom member 102 that is folded in half along a fold line 103.

[0054] The packaging bag 100 has two body members 101, one at the front and one at the back. The planar shapes of the front and back body members 101 may be the same. The bottom member 102 is folded in along a fold line 103 so that its outer surfaces face each other. Above the fold line 103, body seal portions 104 are formed on the left and right sides, and the inner surfaces of the front and back body members 101 are joined together.

[0055] The bottom member 102 is sandwiched between the front and rear body members 101 with the fold line 103 facing upwards. Below the fold line 103, a bottom seal portion 105 is formed where the inner surface of the bottom member 102 is joined to the inner surface of the body member 101. The bottom seal portion 105 joins the area of ​​the bottom member 102 demarcated by the fold line 103 to the body member 101 on the same side in the front-to-back direction. By spreading the bottom member 102 relative to the fold line 103, the packaging bag 100 can be made to stand on its own.

[0056] If the packaging bag 100 has a body member 101 and a bottom member 102, the laminate 10 of the embodiment may be used for either the body member 101 or the bottom member 102, or for both. From the viewpoint of improving tearability, it is preferable to use the laminate 10 for the body member 101. It is also suitable for packaging bags 100 used to enclose liquids.

[0057] The dimensions of packaging bag 100 are not particularly limited, but for example, when used as a refillable container, the height in the vertical direction is approximately 100-500 mm, the width in the horizontal direction is approximately 70-300 mm, and the filling volume is approximately 100 cm. 3 ~5000cm 3 The degree can be mentioned. The state of the contents can be fluids such as liquids, powders, or granules, or solids such as articles. The type of contents is not particularly limited, but can be detergents, chemicals, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, fuels, etc.

[0058] The packaging bag 100 may have a filling opening, a spout, etc. For example, the top of the packaging bag 100 may be open between the front and rear body members 101, allowing it to be used for filling or dispensing contents. After filling with contents, the body members 101 may be joined together to seal the packaging bag 100. When opening the packaging bag 100, the area where the body members 101 were joined can be easily torn. Although not specifically shown, the spout may be formed as a thin projection at the top or corner of the packaging bag 100. The spout may be made of film or be of the spout type. When a spout is installed diagonally at a corner, biaxial stretching is advantageous in terms of drop strength, etc.

[0059] The method for recycling the laminate 10 or packaging bag 100 of the embodiment after use is not particularly limited, but can be appropriately selected depending on the condition at the time of collection, etc. Since the laminate 10 of the embodiment can have a high proportion of polyolefin resin, both chemical recycling and mechanical recycling are possible. By recycling the laminate 10 or packaging bag 100 of the embodiment, it is also possible to regenerate similar products such as the laminate 10 or packaging bag 100. The recycled material may be used in products such as paints, molded products, and hydrocarbon oils.

[0060] Although the present invention has been described above based on preferred embodiments, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. Modifications include the addition, substitution, omission, and other changes to the components.

[0061] The laminate 10 of the embodiment is a laminated film mainly composed of polyolefin resin and is not limited to packaging laminates such as pouches, bags, containers, and packaging films, but can be used for various applications. If the laminate 10 is a flexible laminated film, a flexible packaging bag 100 can be formed. The packaging bag 100 may be formed from the laminate 10 alone, or it may be combined with auxiliary components such as labels, tags, straws, and outer boxes. From a recycling standpoint, it is preferable that the auxiliary components can be separated from the packaging bag 100. [Examples]

[0062] The present invention will be described in more detail below as examples, but it is not limited to these examples.

[0063] <Fabrication of laminates> In Example 1, a laminate was prepared by laminating a film with a layer structure of OPP 20 μm / BO-PE 25 μm / LLDPE 80 μm. Comparative Example 1 involved laminating a film with a layer configuration of Ny 15 μm / VM-PET 12 μm / LLDPE 120 μm to create a laminate. Comparative Example 2 involved laminating a film with a layer configuration of OPP 20 μm / VM-OPP 18 μm / LLDPE 100 μm to create a laminate. Comparative Example 3 involved laminating a film with a layer configuration of MDO-PE 25 μm / BO-PE 25 μm / LLDPE 80 μm to create a laminate.

[0064] In the above layer configuration, OPP represents stretched polypropylene, PE represents polyethylene, LLDPE represents linear low-density polyethylene, Ny represents nylon, PET represents polyethylene terephthalate, MDO- represents uniaxially oriented, BO- represents biaxially oriented, and VM- represents aluminum vapor deposition.

[0065] <Evaluation of recyclability> The recyclability of the laminate was evaluated as good (○) if the laminate contained only PP or PE films, and poor (×) if it contained films other than PP or PE.

[0066] <Evaluation of the ability to end a relationship quickly> The ease of tearing the laminate by hand was evaluated by making a half-cut line with a laser on a refill pouch using the laminate as the main body component, and then tearing the opening by hand. If it could be opened (○), it was evaluated as not being able to be opened (×).

[0067] <Productivity Evaluation> The productivity of the laminate was evaluated as good (○) if the melting point of the outermost layer was higher than that of the sealant resin layer, and poor (×) if the melting points of the sealant resin layer and the outermost layer were the same.

[0068] <Evaluation Results> The evaluation results for Example 1 were: Recyclability: ○, Ease of tearing by hand: ○, Productivity: ○. The evaluation results for Comparative Example 1 were: Recyclability: ×, Ease of handling: ○, Productivity: ○. The evaluation results for Comparative Example 2 were: Recyclability: ○, Ease of handling: ×, Productivity: ○. The evaluation results for Comparative Example 3 were: Recyclability: ○, Ease of handling: ○, Productivity: ×. [Explanation of Symbols]

[0069] 10...Laminate, 11...Sealant resin layer, 12...Biaxially oriented polyethylene resin layer, 13...Oriented polypropylene resin layer, 14,15...Adhesive layer, 100...Packaging bag, 101...Body member, 102...Bottom member, 103...Fold line, 104...Body seal part, 105...Bottom seal part.

Claims

1. A laminate comprising a sealant resin layer, a biaxially oriented polyethylene resin layer, and an oriented polypropylene resin layer in this order, wherein the sealant resin layer is an unoriented polyethylene resin layer, the biaxially oriented polyethylene resin layer is adjacent to the sealant resin layer, and the oriented polypropylene resin layer is bonded adjacent to the biaxially oriented polyethylene resin layer via an adhesive layer.

2. The laminate according to claim 1, characterized in that the sealant resin layer is a C6LLDPE layer or a C8LLDPE layer.

3. A packaging bag characterized in that at least one component is formed from the laminate described in claim 1 or 2.

4. The packaging bag according to claim 3, characterized in that it is a standing pouch.

5. The packaging bag according to claim 3, characterized in that it is used for sealing liquids.

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