Laminate and packaging bag

Abstract

To provide a laminate and a packaging bag having excellent tearability and hardly breaking while realizing monomaterialization.SOLUTION: A laminate having a laminated structure including a base material layer formed of a polyolefin film, a first adhesive layer, and a sealant layer containing a polyolefin-based resin in this order, wherein a void is present between the base material layer and the sealant layer, a maximum length of the void in a thickness direction of the laminate is 40 μm or more, and the base material layer does not have a penetrating portion penetrating the base material layer in a thickness direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a laminate and a packaging bag. [Background technology]

[0002] Packaging bags for storing cosmetics, shampoo, conditioner, body soap, laundry detergent, etc. are known. Such packaging bags are provided with a spout for pouring out the contents. The laminate constituting such packaging bags is required to be easy to tear.

[0003] However, packaging bags made of film laminates made of different materials are not easy to separate and sort by material after being collected as waste. Therefore, in order to improve recyclability, research is being conducted into packaging materials made of a single material, so-called mono-material packaging materials.

[0004] Patent Document 1 discloses a pouch composed of a laminate including a substrate containing a polyethylene film, a sealant layer containing a polyethylene film, and a specific heat-generating layer, in which the half-cut line includes a specific through-hole that penetrates the substrate.

[0005] Patent Document 2 discloses a laminate having a sealant layer formed from a polyolefin resin and a base layer formed from a polyolefin resin, characterized in that a cut is formed by removing at least a portion of the base layer in the thickness direction by laser irradiation without penetrating the laminate in the thickness direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2022-112322 [Patent Document 2] Japanese Patent Publication No. 2023-045055 Summary of the Invention [Problem to be solved by the invention]

[0007] The inventors' investigations revealed that when the substrate includes a through-hole that penetrates the substrate, such as the pouch disclosed in Patent Document 1 or the laminate disclosed in Patent Document 2, there is a problem in that the through-hole becomes prone to tearing.

[0008] The present disclosure provides a laminate and a packaging bag that are made of a mono-material and have excellent tearability and are difficult to break. [Means for solving the problem]

[0009] In order to solve the above problems, the present disclosure provides the following laminate and packaging bag. [1] A substrate layer made of a polyolefin film; a first adhesive layer; a sealant layer containing a polyolefin resin; A laminate having a laminate structure comprising the following in this order: A gap is formed between the base layer and the sealant layer, The maximum length of the voids in the thickness direction of the laminate is 40 μm or more, A laminate in which the base material layer does not have a through-hole that penetrates through the base material layer in the thickness direction. [2] A substrate layer made of a polyolefin film; a first adhesive layer; an intermediate layer made of a polyolefin film; a second adhesive layer; and a sealant layer containing a polyolefin resin; A laminate having a laminate structure comprising the following in this order: A gap is formed between the base layer and the sealant layer, The maximum length of the voids in the thickness direction of the laminate is 40 μm or more, A laminate in which the intermediate layer does not have a through-hole that penetrates through the intermediate layer in the thickness direction. [3] The laminate according to [2], wherein the intermediate layer is an unstretched polyolefin film. [4] The laminate according to [2] or [3], wherein the substrate layer has a through-hole that penetrates the substrate layer in the thickness direction. [5] The laminate according to any one of [2] to [4], wherein the second adhesive layer is formed using at least one of a urethane adhesive and an epoxy adhesive. [6] The laminate according to any one of [2] to [5], wherein the first adhesive layer is formed using at least one of a urethane adhesive and an epoxy adhesive. [7] The laminate according to any one of [2] to [6], wherein the substrate layer is a stretched polyolefin film. [8] The laminate according to any one of [2] to [7], wherein the content of the polyethylene resin is 90 mass % or more based on the total mass of the laminate. [9] A packaging bag produced by stacking the laminate according to any one of [2] to [8] so that the sealant layers face each other and sealing the laminate.

[10] The packaging bag according to [9], wherein voids are located on the front and back surfaces of the packaging bag.

[11] The packaging bag according to

[10] , wherein when the packaging bag is viewed in a plane in the thickness direction, the distance between the gap on the front surface and the gap on the back surface is 0.5 mm or less.

[12] A storage section capable of storing a predetermined item; a seal formed around the housing; a pouring portion including a pouring outlet through which the contents can be poured out when the container is opened; Equipped with The packaging bag according to any one of [9] to

[11] , wherein the gap is provided so as to form a planned opening line that defines the opening of the spout.

[13] The spout includes a spout seal that defines a flow path of the spout; The packaging bag according to

[12] , wherein a gap is provided in the pouring seal portion. [Effects of the Invention]

[0010] According to the present disclosure, a laminate and a packaging bag are provided that are made of a mono-material, have excellent tearability, and are difficult to break. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view schematically showing a laminate according to one embodiment. [Figure 2] FIG. 2 is a cross-sectional view schematically showing a laminate according to another embodiment. [Figure 3] FIG. 3 is a schematic diagram showing a method for producing the laminate of FIG. [Figure 4] FIG. 4 is a front view schematically showing a standing pouch according to one embodiment. [Figure 5] FIG. 5 is a perspective view schematically showing a pair of laminates and a bottom tape that constitute the standing pouch shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view schematically showing the configuration of the standing pouch shown in FIG. [Figure 7] FIG. 7 is an enlarged plan view showing the vicinity of the spout portion S of the standing pouch shown in FIG. [Figure 8] FIG. 8 is an image of a cross section of the laminate obtained in Example 7. DETAILED DESCRIPTION OF THE INVENTION

[0012] [Laminate] First Embodiment A laminate according to a first embodiment of the present disclosure will now be described in detail. FIG. 1 is a cross-sectional view schematically illustrating a laminate according to this embodiment (hereinafter simply referred to as a laminate). The laminate 35 has a laminate structure including a base layer L1, a first adhesive layer L5a, an intermediate layer L2, a vapor deposition layer L4, a second adhesive layer L5b, and a sealant layer L3, in this order. The laminate 35 has a gap H1 between the intermediate layer L2 and the sealant layer L3. The maximum length T1 of the gap H1 in the thickness direction of the laminate 35 is 40 μm or more. The intermediate layer L2 does not have a through portion that penetrates through the thickness direction of the intermediate layer L2. The laminate 35 is a gas barrier laminate having gas barrier properties.

[0013] The laminate 35 has excellent tearability and is resistant to rupture while achieving mono-material construction. The inventors speculate that the reason for this effect is as follows. That is, the laminate 35 has excellent tearability because the voids H1, each having a maximum length T1 of 40 μm or more, act as tearing initiation points. Furthermore, the intermediate layer L2 does not have any through-holes that penetrate through the thickness of the intermediate layer L2. This allows the laminate 35 to have excellent tearability while also being resistant to rupture.

[0014] The maximum length T1 of the gap H1 in the thickness direction of the laminate 35 is preferably 40 μm or more, more preferably 60 μm or more, and even more preferably 80 μm or more, because this provides better tear resistance. The maximum length T1 of the gap H1 in the thickness direction of the laminate 35 is preferably 150 μm or less, more preferably 120 μm or less, and even more preferably 100 μm or less, from the viewpoints of the strength and barrier properties of the relevant portion (laser irradiated portion).

[0015] The maximum length W1 of the voids H1 in the direction parallel to the main surface of the laminate 35 is preferably 50 μm or more, more preferably 70 μm or more, and even more preferably 100 μm or more, because this provides better tear resistance. From the viewpoint of the breaking strength of the relevant portion, the maximum length W1 of the voids H1 in the direction parallel to the main surface of the laminate 35 is preferably 300 μm or less, more preferably 250 μm or less, and even more preferably 200 μm or less.

[0016] The laminate 35 has a gap H2 between the base layer L1 and the intermediate layer L2. The maximum length T2 of the gap H2 in the thickness direction of the laminate 35 is preferably 20 μm or more, more preferably 25 μm or more, and even more preferably 30 μm or more, in order to achieve better tear resistance. The maximum length T2 of the gap H2 in the thickness direction of the laminate 35 is preferably 40 μm or less, more preferably 35 μm or less, and even more preferably 30 μm or less, in terms of the strength and barrier properties of the relevant portion (laser irradiated portion).

[0017] The maximum length W2 of the voids H2 in the direction parallel to the main surface of the laminate 35 is preferably 50 μm or more, more preferably 70 μm or more, and even more preferably 100 μm or more, because this provides better tear resistance. From the viewpoint of the breaking strength of the relevant portion, the maximum length W2 of the voids H2 in the direction parallel to the main surface of the laminate 35 is preferably 300 μm or less, more preferably 250 μm or less, and even more preferably 200 μm or less.

[0018] The maximum lengths T1, T2, W1, and W2 may be values ​​measured by observing the cross section of the laminate 35 with a scanning electron microscope at a magnification of 500 times.

[0019] The voids H1 and H2 are preferably provided linearly along the MD of the laminate 35, as this provides better tearability.

[0020] The laminate 35 may have raised portions R1 resulting from the voids H1. The height of the raised portions R1 relative to the flat portion of the laminate 35 may be, for example, 10 to 300 μm, 10 to 200 μm, or 10 to 100 μm.

[0021] From the viewpoint of recyclability, the content of the polyolefin resin in the laminate 35 is preferably 90% by mass or more, based on the total mass of the laminate 35. From the viewpoint of achieving a higher degree of mono-materialization, the content of the polyolefin resin in the laminate 35 is more preferably 92% by mass or more, and even more preferably 95% by mass or more.

[0022] From the viewpoint of recyclability, the content of the polyethylene resin in the laminate 35 is preferably 90% by mass or more, based on the total mass of the laminate 35. From the viewpoint of achieving a higher degree of mono-materialization, the content of the polyethylene resin in the laminate 35 is more preferably 92% by mass or more, and even more preferably 95% by mass or more.

[0023] From the viewpoint of recyclability, the content of the polypropylene resin in the laminate 35 is preferably 90% by mass or more, based on the total mass of the laminate 35. From the viewpoint of achieving a higher degree of mono-materialization, the content of the polypropylene resin in the laminate 35 is more preferably 92% by mass or more, and even more preferably 95% by mass or more.

[0024] The substrate layer L1, the first adhesive layer L5a, the intermediate layer L2, the vapor deposition layer L4, the second adhesive layer L5b, and the sealant layer L3 will be described in detail below.

[0025] (Base material layer L1) The base layer L1 is made of a polyolefin film containing a polyolefin resin, and the polyolefin film may be unstretched, uniaxially stretched, or biaxially stretched.

[0026] In the present disclosure, an unstretched polyolefin film refers to a polyolefin film that is not stretched during film formation and has a structure in which spherical crystals (spherulites) of approximately 10 to 100 μm in size, composed of randomly folded polyolefin molecular chains, are connected by amorphous molecules.

[0027] In the present disclosure, the stretched polyolefin film refers to a polyolefin film that has been stretched during film formation. The stretching ratio may be, for example, 3 times or more, or 5 times or more, or 10 times or less, or 8 times or less.

[0028] The polyolefin film may be a polyethylene film containing a polyethylene-based resin, or a polypropylene film containing a polypropylene-based resin, and is preferably a polyethylene film from the viewpoint of recyclability.

[0029] Examples of polyethylene resins include acid-modified polyethylene obtained by graft-modifying polyethylene with an unsaturated carboxylic acid, an acid anhydride of an unsaturated carboxylic acid, an ester of an unsaturated carboxylic acid, or the like.

[0030] The density of polyethylene resin is 0.940 g / cm 3 It is preferable that the concentration is 0.945 g / cm or more. 3 More preferably, it is 0.950 g / cm or more. 3 It is more preferable that the density of the polyethylene resin is 0.940 g / cm or more. 3 When the density of the polyethylene resin is 0.940 g / cm or more, only the sealant layer L3 can be easily fused during heat sealing when forming the laminate into a bag, resulting in good suitability for bag formation. 3 When the density of the polyethylene resin is 0.940 g / cm or more, the printability is good when a printing layer is formed on the base layer L1. 3 If the density is 0.96 g / cm or more, the base layer L1 is easily prevented from being stretched and wrinkled during roll processing, and when a vapor-deposited layer L4 is provided on the base layer L1, the vapor-deposited layer L4 is easily prevented from being cracked. 3 It may be the following:

[0031] Examples of polypropylene resins include homopolypropylene, block polypropylene, and random polypropylene.

[0032] The density of polypropylene resin is, for example, 0.90 g / cm 3 More than 0.91g / cm 3 It may be the following:

[0033] The content of the polyolefin resin in the base layer L1 may be 50% by mass or more, 80% by mass or more, or even 100% by mass based on the total mass of the base layer L1. Using a polyolefin resin as the material for the base layer L1 is preferable from the viewpoint of recyclability. Furthermore, the higher the content of the polyolefin resin in the base layer L1, the more improved the recyclability.

[0034] The content of the polyethylene resin in the base layer L1 may be 50% by mass or more, 80% by mass or more, or 100% by mass based on the total mass of the base layer L1. Using a polyethylene resin as the material for the base layer L1 is preferable from the viewpoint of recyclability. Furthermore, the higher the content of the polyethylene resin in the base layer L1, the more improved the recyclability.

[0035] The content of the polypropylene resin in the base layer L1 may be 50% by mass or more, 80% by mass or more, or 100% by mass based on the total mass of the base layer L1. Using a polypropylene resin as the material for the base layer L1 is preferable from the viewpoint of recyclability. Furthermore, the higher the content of the polypropylene resin in the base layer L1, the more improved the recyclability.

[0036] The base layer L1 may be a multilayer structure comprising multiple films each containing polyolefins of different densities as the main component. The base layer L1 may be appropriately multilayered, taking into consideration the processability, rigidity, stiffness, heat resistance, and powder shedding during transport of the films constituting the base layer L1. Furthermore, the contents of slip agents, antistatic agents, etc. may be varied in each layer. The base layer L1 comprising multiple layers can be laminated into a film by extrusion molding, co-extrusion molding, sheet molding, co-extrusion blow molding, etc. The total thickness of the base layer L1 comprising multiple layers is preferably approximately 10 to 100 μm, more preferably 15 to 50 μm.

[0037] The base material layer L1 does not have any through-holes that penetrate the base material layer L1.

[0038] The molecular orientation ratio (MOR) of the base layer L1 may be 1.07 or less, 1.05 or less, or 1.04 or less. The lower the molecular orientation ratio, the more excellent the isotropy of the base layer L1. When the molecular orientation ratio is 1.07 or less, the adhesion (peel resistance) of the base layer L1 in the laminate tends to be good. The molecular orientation ratio can be measured using a molecular orientation meter.

[0039] The base layer L1 preferably has a thermal shrinkage rate of 3% or less, more preferably 2% or less, and even more preferably 1.5% or less in the machine direction (hereinafter also simply referred to as MD) and the transverse direction (hereinafter also simply referred to as TD) after heating for 15 minutes at 100° C. If the thermal shrinkage rate of the base layer L1 is within the above range, the base layer L1 is likely to be prevented from stretching and wrinkling during rolling, and when a vapor-deposited layer L4 is provided on the base layer L1, the vapor-deposited layer L4 is likely to be prevented from cracking.

[0040] Here, the heat shrinkage rate (%) is a value calculated by the following formula. Heat shrinkage rate (%) = {(length before heating - length after heating) / length before heating} x 100 The procedure for measuring the heat shrinkage rate is as follows. (1) The substrate layer L1 is cut into a 20 cm x 20 cm sample to be used as a measurement sample. (2) Draw a 10 cm line on the MD or TD of the measurement sample (the length before heating). (3) Heat the measurement sample at 100°C for 15 minutes. (4) The length of the written line in MD or TD is measured (length after heating). (5) Calculate the thermal shrinkage rate using the above formula.

[0041] The thickness of the base layer L1 is not particularly limited and can be set to 6 to 200 μm depending on the application, but may be 9 to 50 μm, 12 to 38 μm, or 20 to 40 μm from the viewpoint of obtaining excellent impact resistance and excellent bag-making properties.

[0042] In order to improve adhesion between the adjacent layers, the base layer L1 may be subjected to various pretreatments such as corona treatment, plasma treatment, low-temperature plasma treatment, flame treatment, chemical treatment, solvent treatment, and ozone treatment on the lamination surface, as long as the barrier performance is not impaired, or a coating layer such as an easy-adhesion layer may be provided.

[0043] The base layer L1 may contain additives such as a filler, an antiblocking agent, an antistatic agent, a plasticizer, a lubricant, an antioxidant, etc. These additives may be used alone or in combination of two or more.

[0044] (Adhesive layer L5a, L5b) By providing adhesive layers L5a and L5b, the adhesion between the base layer L1 and the intermediate layer L2 and between the intermediate layer L2 and the sealant layer L3 is increased, making delamination less likely, and the pressure resistance and impact resistance required for the packaging bag can be maintained.

[0045] The adhesive layers L5a and L5b preferably do not contain chlorine. The chlorine-free adhesive layers L5a and L5b can prevent the adhesive or recycled resin from becoming discolored or from generating odors during heat treatment. From an environmental perspective, it is preferable to use biomass materials for the adhesive layers L5a and L5b. Furthermore, biomass polyethylene can be used for the polyethylene. From an environmental perspective, it is preferable that the adhesive does not contain solvents.

[0046] The adhesive for forming the adhesive layers L5a and L5b can be selected depending on the bonding method, and is preferably a urethane adhesive or an epoxy adhesive from the viewpoint of resistance to contents.

[0047] (urethane adhesive) The urethane adhesive is a resin composition containing a polyol having two or more hydroxyl groups per molecule and an isocyanate compound having two or more isocyanate groups per molecule. Urethane bonds are generated by curing the urethane adhesive. The urethane adhesive is preferably a two-component curing type.

[0048] The urethane adhesive may have gas barrier properties. Methods for imparting gas barrier properties to a urethane adhesive include, for example, a method using a polyol having a skeleton with gas barrier properties, a method including a phosphoric acid-modified compound in the resin composition, and a method including a plate-like inorganic compound in the resin composition. These methods can be used alone or in combination of two or more.

[0049] The polyol having a skeleton with barrier properties preferably has a main skeleton of polyester or polyester polyurethane, the polyester containing a structure derived from an ortho-oriented aromatic dicarboxylic acid or an anhydride thereof. The polyester portion of the main skeleton may be obtained by polycondensation reaction of a polycarboxylic acid and a polyhydric alcohol.

[0050] Examples of polycarboxylic acids include aliphatic polycarboxylic acids and aromatic polycarboxylic acids, such as succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid.

[0051] Examples of aromatic polycarboxylic acids include orthophthalic acid, terephthalic acid, isophthalic acid, pyromellitic acid, trimellitic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, naphthalic acid, biphenyldicarboxylic acid, 1,2-bis(phenoxy)ethane-p,p'-dicarboxylic acid, and anhydrides of these dicarboxylic acids, as well as polybasic acids such as p-hydroxybenzoic acid and p-(2-hydroxyethoxy)benzoic acid. The polycarboxylic acids can be used alone or in combination of two or more.

[0052] The polycarboxylic acid is preferably an ortho-oriented aromatic dicarboxylic acid or an anhydride thereof. The content of the ortho-oriented aromatic dicarboxylic acid or anhydride thereof is preferably 70 to 100 mass% based on the total amount of the polycarboxylic acid components constituting the polyester.

[0053] Examples of the ortho-oriented aromatic dicarboxylic acid include orthophthalic acid, 1,2-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, and anhydrides of these dicarboxylic acids.

[0054] The polyhydric alcohols include aliphatic polyhydric alcohols and aromatic polyhydric phenols, such as ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, cyclohexanedimethanol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, methylpentanediol, dimethylbutanediol, butylethylpropanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, and tripropylene glycol.

[0055] Examples of aromatic polyhydric phenols include hydroquinone, resorcinol, catechol, naphthalenediol, biphenol, bisphenol A, bisphenol F, and tetramethylbiphenol, as well as ethylene oxide-extended products and hydrogenated alicyclic phenols thereof.

[0056] The isocyanate compound may be an aromatic compound having an aromatic ring or an aliphatic compound having no aromatic ring, a low molecular weight compound or a high molecular weight compound, and may be a diisocyanate compound having two isocyanate groups or a polyisocyanate compound having three or more isocyanate groups. The isocyanate compound may also be a blocked isocyanate compound obtained by addition reaction with an isocyanate blocking agent.

[0057] The isocyanate compound is preferably a polyisocyanate compound from the viewpoint of the adhesiveness of the adhesive layer 2. The isocyanate compound is preferably one having an aromatic ring, since it imparts oxygen barrier properties to the adhesive layer 2, and is particularly preferably an isocyanate compound containing a metaxylene skeleton.

[0058] Examples of the isocyanate compound include tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, metaxylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, and trimers of these isocyanate compounds. These isocyanate compounds may be adducts, biurets, or allophanates obtained by reacting an isocyanate compound with a low-molecular-weight active hydrogen compound such as ethylene glycol, propylene glycol, meta-xylylene alcohol, 1,3-bishydroxyethylbenzene, 1,4-bishydroxyethylbenzene, trimethylolpropane, glycerol, pentaerythritol, erythritol, sorbitol, ethylenediamine, monoethanolamine, diethanolamine, triethanolamine, or meta-xylylenediamine, or an alkylene oxide adduct thereof, or a high-molecular-weight active hydrogen compound such as various polyester resins, polyether polyols, or polyamides.

[0059] <Epoxy adhesive> The epoxy adhesive is a resin composition containing an epoxy resin and an epoxy resin curing agent.

[0060] The epoxy resin may have a saturated bond or an unsaturated bond and may be any of an aliphatic compound, an alicyclic compound, an aromatic compound, and a heterocyclic compound. In order to exhibit higher gas barrier properties, the epoxy resin is preferably an epoxy resin containing an aromatic ring or an alicyclic structure in the molecule.

[0061] Examples of epoxy resins include epoxy resins having a glycidylamino group derived from meta-xylylenediamine, epoxy resins having a glycidylamino group derived from 1,3-bis(aminomethyl)cyclohexane, epoxy resins having a glycidylamino group derived from diaminodiphenylmethane, epoxy resins having a glycidylamino group and / or a glycidyloxy group derived from para-aminophenol, epoxy resins having a glycidyloxy group derived from bisphenol A, epoxy resins having a glycidyloxy group derived from bisphenol F, epoxy resins having a glycidyloxy group derived from phenol novolac, and epoxy resins having a glycidyloxy group derived from resorcinol. One epoxy resin may be used alone, or two or more may be used in combination. From the viewpoint of gas barrier properties, epoxy resins having a glycidylamino group derived from meta-xylylenediamine and epoxy resins having a glycidyloxy group derived from bisphenol F are preferred, with epoxy resins having a glycidylamino group derived from meta-xylylenediamine being more preferred.

[0062] The epoxy resin curing agent may be a reaction product of metaxylylenediamine or paraxylylenediamine with an unsaturated carboxylic acid and / or its derivative represented by the following formula (1):

[0063] [ka] [In formula (1), R 1 represents an alkyl group having 1 to 8 carbon atoms, an aralkyl group having 1 to 8 carbon atoms, or an aryl group.]

[0064] The use of metaxylylenediamine or paraxylylenediamine as a precursor of an epoxy resin curing agent further improves gas barrier properties. From the viewpoint of gas barrier properties, metaxylylenediamine or paraxylylenediamine is preferred. One type of metaxylylenediamine or paraxylylenediamine may be used alone, or two or more types may be used in combination.

[0065] By using the unsaturated carboxylic acid represented by the formula (1) and / or its derivative as a precursor for the epoxy resin curing agent, good adhesive properties can be achieved. Examples of the unsaturated carboxylic acid represented by the formula (1) and / or its derivative include unsaturated carboxylic acids such as crotonic acid, 2-pentenoic acid, 2-hexenoic acid, 4-methyl-2-pentenoic acid, 2-heptenoic acid, 4-methyl-2-hexenoic acid, 5-methyl-2-hexenoic acid, 4,4-dimethyl-2-pentenoic acid, 4-phenyl-2-butenoic acid, cinnamic acid, o-methylcinnamic acid, m-methylcinnamic acid, p-methylcinnamic acid, 2-octenoic acid, 2-nonenoic acid, 2-decenoic acid, and 2-undecenoic acid, as well as derivatives thereof (e.g., esters, amides, acid anhydrides, acid chlorides, etc.), but are not limited thereto. The unsaturated carboxylic acid represented by the formula (1) and / or its derivative may be used alone or in combination of two or more.

[0066] The unsaturated carboxylic acid and / or its derivative represented by the above formula (1) further improves the gas barrier property and adhesive property, so that R 1 is preferably at least one selected from the group consisting of unsaturated carboxylic acids and derivatives thereof, where R is a hydrocarbon group having 1 to 3 carbon atoms or a phenyl group, more preferably at least one selected from the group consisting of crotonic acid and crotonic acid derivatives, and even more preferably at least one selected from the group consisting of crotonic acid and crotonic acid esters. As the crotonic acid ester, alkyl esters having 1 to 3 carbon atoms are more preferred, and methyl crotonate is even more preferred.

[0067] The adhesive layers L5a, L5b may be formed using a one-component curing or two-component curing adhesive (dry lamination method), may be formed using a solvent-free adhesive (non-solvent dry lamination method), or may be formed by extruding molten resin onto the surface of the layer to be adhered (extrusion lamination method).

[0068] The thickness of the adhesive layers L5a and L5b may be, for example, 0.1 to 10 μm, 0.1 to 5.0 μm, or 0.2 to 2.0 μm.

[0069] (middle layer L2) The intermediate layer (L2) is made of a polyolefin film containing a polyolefin resin. The polyolefin film may be unstretched, uniaxially stretched, or biaxially stretched. The stretching ratio may be, for example, 3 times or more, or 5 times or more, and 10 times or less, or 8 times or less.

[0070] The polyolefin film may be a polyethylene film containing a polyethylene-based resin, or a polypropylene film containing a polypropylene-based resin, and is preferably a polyethylene film from the viewpoint of recyclability.

[0071] The content of the polyolefin resin in the intermediate layer L2 may be 50% by mass or more, 80% by mass or more, or even 100% by mass based on the total mass of the intermediate layer L2. Using a polyolefin resin as the material for the intermediate layer L2 is preferable from the viewpoint of recyclability. Furthermore, the higher the content of the polyolefin resin in the intermediate layer L2, the more improved the recyclability.

[0072] The content of the polyethylene resin in the intermediate layer L2 may be 50% by mass or more, 80% by mass or more, or even 100% by mass based on the total mass of the intermediate layer L2. Using a polyethylene resin as the material for the intermediate layer L2 is preferable from the viewpoint of recyclability. Furthermore, the higher the content of the polyethylene resin in the intermediate layer L2, the more improved the recyclability.

[0073] The content of the polypropylene-based resin in the intermediate layer L2 may be 50% by mass or more, 80% by mass or more, or even 100% by mass based on the total mass of the intermediate layer L2. Using a polypropylene-based resin as the material for the intermediate layer L2 is preferable from the viewpoint of recyclability. Furthermore, the higher the content of the polypropylene-based resin in the intermediate layer L2, the more improved the recyclability.

[0074] Examples of polyethylene resins include acid-modified polyethylene obtained by graft-modifying polyethylene with an unsaturated carboxylic acid, an acid anhydride of an unsaturated carboxylic acid, an ester of an unsaturated carboxylic acid, or the like.

[0075] Examples of polyethylene constituting the intermediate layer L2 include high density polyethylene (HDPE), medium density polyethylene (MDPE), etc. Among these, HDPE and MDPE with a density of 0.925 g / cm are preferred from the viewpoint of heat resistance. 3 It is preferable to use a material having a density of 0.93 to 0.98 g / cm or more. 3 It is preferable to use high density polyethylene in the range of

[0076] Examples of polypropylene resins include homopolypropylene, block polypropylene, and random polypropylene.

[0077] The density of polypropylene resin is, for example, 0.90 g / cm 3 More than 0.91g / cm 3 It may be the following:

[0078] The intermediate layer L2 may contain components other than the polyolefin resin, such as the same components as those in the base layer L1.

[0079] The intermediate layer L2 does not have a through-hole that penetrates the intermediate layer L2 in the thickness direction.

[0080] The melting point of the intermediate layer L2 is preferably 120°C or higher, and more preferably 125°C or higher.

[0081] The thickness of the intermediate layer L2 is, for example, 5 to 800 μm, and may be 5 to 500 μm or 10 to 50 μm.

[0082] [Sealant layer L3] The sealant layer L3 contains a polyolefin resin. The content of the polyolefin resin in the sealant layer L3 may be 50% by mass or more, 80% by mass or more, or even 100% by mass based on the total mass of the sealant layer L3. Using a polyolefin resin as the material for the sealant layer L3 is preferable from the viewpoint of recyclability. Furthermore, the higher the content of the polyolefin resin in the sealant layer L3, the more improved the recyclability. Examples of polyolefin resins include polyethylene resins and polypropylene resins.

[0083] The thickness of the sealant layer L3 is, for example, 40 to 150 μm, and may be 20 to 250 μm. The melting point of the sealant layer L3 is preferably 125° C. or lower, more preferably 95 to 120° C. The sealant layer L3 has a density of 0.925 g / cm 3 Less than (more preferably 0.900 to 0.920 g / cm 3 It is preferable that the polyethylene resin be made of a polyethylene-based resin such as linear low-density polyethylene (LLDPE) or very low-density polyethylene (VLDPE). Specific examples include linear low-density polyethylene (LLDPE) and very low-density polyethylene (VLDPE). Blends of these polyethylenes may also be used.

[0084] The polyethylene resin constituting the sealant layer L3 is preferably C4-LLDPE because it has better tear resistance. C4-LLDPE is a type of LLDPE (linear low-density polyethylene) made from a copolymer of ethylene and 1-butene, and has a molecular structure in which a side chain with four carbon atoms derived from 1-butene is attached to the ethylene-derived LLDPE main chain. C4-LLDPE has shorter side chains and a lower melt flow rate (MFR) than C6-LLDPE and C8-LLDPE, and therefore has relatively low tensile impact strength, tensile strength, and tensile modulus. Therefore, when the polyethylene resin constituting the sealant layer L3 is C4-LLDPE, the laminate 35 has better MD tear resistance.

[0085] Biomass polyethylene, which uses biomass-derived ethylene as a raw material, may be used as part or all of the polyethylene resin contained in the sealant layer L3. Such a sealant film is disclosed, for example, in JP 2013-177531 A. The sealant layer L3 may contain mechanically recycled polyethylene, which is made from used polyethylene products or resin (so-called burrs) generated during the manufacturing process of polyethylene products.

[0086] (Vapor deposited layer L4) Examples of materials constituting the vapor-deposited layer L4 include inorganic oxides such as aluminum oxide, silicon oxide, magnesium oxide, and tin oxide. From the viewpoints of transparency and barrier properties, the inorganic oxide may be selected from the group consisting of aluminum oxide, silicon oxide, and magnesium oxide. Furthermore, from the viewpoint of excellent tensile stretchability during processing, the vapor-deposited layer L4 is preferably a layer containing silicon oxide. By using the vapor-deposited layer L4, high barrier properties can be obtained with a very thin layer that does not affect the recyclability of the laminate.

[0087] The O / Si ratio of the vapor-deposited layer L4 is preferably 1.7 or higher. When the O / Si ratio is 1.7 or higher, the content of metallic Si is suppressed, making it easier to achieve good transparency. Furthermore, the O / Si ratio is preferably 2.0 or lower. When the O / Si ratio is 2.0 or lower, the crystallinity of SiO is increased, preventing the vapor-deposited layer L4 from becoming too hard and improving tensile strength. This can prevent cracks from occurring in the vapor-deposited layer L4 when the adhesive layer L5b is laminated. Furthermore, even after forming into a packaging bag, the base layer L1 may shrink due to heat during the boiling treatment. However, when the O / Si ratio is 2.0 or lower, the vapor-deposited layer L4 can easily adapt to this shrinkage, making it easier to prevent a decrease in barrier properties. To fully achieve these effects, the O / Si ratio of the vapor-deposited layer L4 is preferably 1.75 or higher and 1.9 or lower, more preferably 1.8 or higher and 1.85 or lower.

[0088] The O / Si ratio of the deposited layer L4 can be determined by X-ray photoelectron spectroscopy (XPS). For example, an X-ray photoelectron spectrometer (manufactured by JEOL Ltd., product name: JPS-90MXV) can be used as the measurement device, with a non-monochromated MgKα (1253.6 eV) X-ray source and an X-ray output of 100 W (10 kV-10 mA). For quantitative analysis to determine the O / Si ratio, relative sensitivity factors of 2.28 for O1s and 0.9 for Si2p can be used.

[0089] The thickness of the vapor-deposited layer L4 is preferably 10 nm or more and 50 nm or less. A thickness of 10 nm or more can provide sufficient gas barrier properties. Furthermore, a thickness of 50 nm or less can prevent cracks from occurring due to deformation caused by internal stress in the thin film, thereby preventing a decrease in gas barrier properties. Furthermore, a thickness of 50 nm or less is also preferable from an economic standpoint, since it is easy to prevent increases in costs due to an increase in the amount of material used and an increase in the film formation time. From the same viewpoint as above, the thickness of the vapor-deposited layer L4 is more preferably 20 nm or more and 40 nm or less.

[0090] The deposition layer L4 can be formed by, for example, vacuum deposition. Vacuum deposition can be performed using physical vapor deposition or chemical vapor deposition. Examples of physical vapor deposition include, but are not limited to, vacuum deposition, sputtering, and ion plating. Examples of chemical vapor deposition include, but are not limited to, thermal CVD, plasma CVD, and photo-CVD.

[0091] In the vacuum film formation, resistance heating vacuum deposition, EB (Electron Beam) heating vacuum deposition, induction heating vacuum deposition, sputtering, reactive sputtering, dual magnetron sputtering, plasma enhanced chemical vapor deposition (PECVD), and the like are particularly preferably used. However, in terms of productivity, vacuum deposition is currently the most superior. As a heating means for vacuum deposition, it is preferable to use any of the electron beam heating method, resistance heating method, and induction heating method.

[0092] Second Embodiment The laminate according to the second embodiment will now be described. FIG. 2 is a schematic cross-sectional view showing the laminate according to this embodiment. Unless inconsistencies arise, the following description is the same as the laminate according to the first embodiment. As shown in FIG. 2, the laminate 55 has a laminate structure including a base layer L1, a vapor deposition layer L4, an adhesive layer L5a, and a sealant layer L3, in this order. The laminate 55 has a gap H1 between the base layer L1 and the sealant layer L3. The maximum length T1 of the gap H1 in the thickness direction of the laminate 55 is 40 μm or more. The base layer L1 does not have a through portion penetrating through the base layer L1 in the thickness direction. The laminate 55 does not include an intermediate layer.

[0093] The laminate 55 has excellent tearability and is resistant to breakage while achieving mono-material construction. The inventors speculate that the reason for this effect is as follows. That is, the laminate 55 has excellent tearability because the voids H1, which have a maximum length T1 of 40 μm, act as tearing points. Furthermore, the base material layer L1 does not have any through-holes that penetrate the base material layer L1 in the thickness direction. This makes the laminate 55 resistant to breakage while still having excellent tearability.

[0094] Although the laminates according to the first and second embodiments have been described in detail above, the laminates of the present disclosure are not limited to the above embodiments. For example, the laminate 35 has a void H2, but the laminate does not necessarily have the void H2. Furthermore, the laminate 35 does not have a through-hole in the base layer L1, but the base layer L1 may have a through-hole.

[0095] In addition, in the laminate 35, the vapor deposition layer is located between the intermediate layer L2 and the adhesive layer L5b, but may be located between the intermediate layer L2 and the adhesive layer L5a, or may be located between the base layer L1 and the adhesive layer L5a. Also, the laminate does not necessarily have to include a vapor deposition layer.

[0096] The laminate may further include other layers in addition to the substrate layer, intermediate layer, sealant layer, adhesive layer, and vapor deposition layer.

[0097] (Other layers) The laminate may have an anchor coat layer between the base layer L1 and the sealant layer L3. The anchor coat layer may be a very thin layer that does not affect the recyclability of the laminate, and can be formed using an anchor coat agent. Examples of anchor coat agents include acrylic resins, epoxy resins, acrylic urethane resins, polyester polyurethane resins, polyether polyurethane resins, and polyvinyl alcohol resins. From the viewpoints of heat resistance and interlayer adhesive strength, acrylic urethane resins and polyester polyurethane resins are preferred as anchor coat agents.

[0098] The laminate may further include, for example, a printed layer. The printed layer may be provided between the substrate layer L1 and the adhesive layer L5a, between the adhesive layer L5a and the intermediate layer L2, between the intermediate layer L2 and the adhesive layer L5b, or between the adhesive layer L5b and the sealant layer L3. When a printed layer is provided, it is preferable to use a printing ink that does not contain chlorine, from the viewpoint of preventing the printed layer from discoloring or generating an odor when remelted. Furthermore, from the viewpoint of environmental consideration, it is preferable to use a biomass material as the compound contained in the printing ink. When the laminate includes a printed layer, the voids H1 become larger, which tends to further improve tearability.

[0099] [Method of manufacturing laminate] A method for producing a laminate according to an embodiment of the present disclosure will now be described in detail. The method for producing a laminate according to this embodiment includes the following steps (1a) and (1b). Step (1a): preparing a laminate having a laminate structure including a substrate layer L1, a first adhesive layer L5a, an intermediate layer L2, a vapor deposition layer L4, a second adhesive layer L5b, and a sealant layer L3 in this order. Step (1b): A step of irradiating the laminate with laser light to volatilize a portion of the laminate, thereby obtaining a laminate having a void between the base layer and the sealant layer.

[0100] <Process (1a)> 3(a) is a cross-sectional view showing an example of the laminate prepared in step (1a). The laminate 30 has a laminate structure including, in this order, a substrate layer L1, a first adhesive layer L5a, an intermediate layer L2, a vapor deposition layer L4, a second adhesive layer L5b, and a sealant layer L3. Each layer may be similar to the laminate 35 described above.

[0101] <Process (1b)> In step (1b), the laminate 30 is irradiated with laser light. The laser light volatilizes a portion of the second adhesive layer L5b, thereby forming a void H1. The laser light also volatilizes a portion of the first adhesive layer L5a, thereby forming a void H2. As a result, a laminate 35 is obtained as shown in FIG. 3(b).

[0102] The laser light irradiated onto the laminate 30 may specifically be a laser light emitted from a carbon dioxide gas laser or a YAG laser, and from the viewpoint of productivity, a laser light emitted from a carbon dioxide gas laser is preferred.

[0103] The wavelength of the irradiated laser light may be, for example, 9.2 to 10.8 μm.

[0104] The scanning speed of the irradiated laser light may be 100 to 1000 mm / sec.

[0105] The output of the irradiated laser light may be 20 to 80W.

[0106] Although the method for manufacturing a laminate according to one embodiment has been described in detail above, the method for manufacturing a laminate according to the present disclosure is not limited to the above embodiment. For example, the laminate prepared in step (1a) may be a laminate having a laminate structure including a base layer L1, a vapor deposition layer L4, a first adhesive layer L5a, and a sealant layer L3 in this order, or may be any other laminate capable of forming a laminate according to the present disclosure.

[0107] [Packaging bag] A packaging bag according to an embodiment of the present disclosure will be described in detail below. Here, a standing pouch (self-standing package) will be described as an example of the packaging bag. The standing pouch is used as a refill pouch for cosmetics, shampoo, conditioner, body soap, laundry detergent, etc. The packaging bag according to this embodiment includes the laminate 35 according to the above embodiment.

[0108] FIG. 4 is a front view schematically illustrating a stand-up pouch according to this embodiment. FIG. 5 is an exploded perspective view schematically illustrating a pair of laminates and a bottom tape constituting the stand-up pouch shown in FIG. 4. FIG. 6 is a cross-sectional view schematically illustrating the configuration of the stand-up pouch shown in FIG. 4. As shown in FIG. 4, a stand-up pouch 10 (packaging bag) includes a storage section 11 that stores (can be enclosed by) a predetermined content, a seal section 12 formed around the storage section 11, an injection section 13 having an injection port for injecting the content into the storage section 11, and a pouring section 20 from which the content can be poured when the pouch is opened. The seal section 12 includes a first seal section 12a provided on one side of the storage section 11 (the left side in the drawing), a second seal section 12b provided on the other side of the storage section 11 (the right side in the drawing), and a third seal section 12c provided on the bottom of the storage section 11. Furthermore, the injection section 13 is designed to be closed by heat sealing after the contents are placed in the storage section 11.

[0109] In such a standing pouch 10, as shown in Fig. 5, laminates 35A and 35B, which are obtained by cutting the laminate 35 into a predetermined shape, are arranged facing each other. The laminates 35A and 35B are heat-sealed at predetermined locations with their respective sealant layers L3 facing inward. The laminates 35A and 35B form the main body of the standing pouch 10. In the standing pouch 10, the laminates 35A and 35B are heat-sealed so that a bottom tape 40 is sandwiched between them on the bottom side.

[0110] The bottom tape 40 has one mountain fold 41. That is, when the standing pouch 10 is in a self-standing state, the bottom tape 40 is arranged in an inverted V shape (see FIGS. 5 and 6). As shown in FIG. 6, the third sealed portion 12c at the bottom of the standing pouch 10 is composed of a heat-sealed portion 14 and a heat-sealed portion 15. The heat-sealed portion 14 is a portion where the bottom portion 31a of the laminate 35A is heat-sealed to one bottom portion 41a of the bottom tape 40. The heat-sealed portion 15 is a portion where the bottom portion 31b of the laminate 35B is heat-sealed to the other bottom portion 41b of the bottom tape 40. As shown in FIG. 4, the laminates 35A, 35B and the bottom tape 40 are heat-sealed so that the bottom of the area for containing the contents is curved and the upper side is arc-shaped.

[0111] As described above, the sealed portion 12, which is the side portion of the standing pouch 10, has a first sealed portion 12a provided on the side of the pouring portion 20, and a second sealed portion 12b provided on the opposite side of the first sealed portion 12a in the horizontal direction (or MD). The width of each of the first sealed portion 12a and the second sealed portion 12b of the sealed portion 12 is, for example, 5 to 18 mm, or may be 7 to 15 mm. When the width of each sealed portion 12 is 5 mm or more, sufficient seal strength tends to be achieved, while when the width is 18 mm or less, it tends to be easier to ensure a sufficient internal volume of the standing pouch 10.

[0112] As shown in FIG. 4, the standing pouch 10 has fused portions 16 and 17 on both sides of the bottom (third seal portion 12c). In this embodiment, two fused portions 16 are formed vertically side by side on one side of the standing pouch 10, and two fused portions 17 are formed vertically side by side on the other side. The fused portions 16 and 17 join the laminates 35A and 35B. The fused portions 16 and 17 are locations where the sealant layers L3 of the laminates 35A and 35B are locally fused to each other through cutouts 44 and 45 provided in the bottom tape 40. As shown in FIG. 6, the cutouts 44 and 45 of the bottom tape 40 are located in the region between the mountain fold 41 and the bottom edges 42 and 43, and on the sides of the bottom tape 40. Providing fused portions 16, 17 on both sides of the bottom further improves the self-supporting ability and drop resistance of standing pouch 10. Note that, although the example shown here shows two pairs of notches 44 and 45 provided on one side of bottom tape 40 to form two fused portions 16, 17, it is also possible to provide a pair of notches on one side of bottom tape 40 to form one fused portion 16 or 17, for example.

[0113] From the viewpoint of recyclability, the content of polyolefin resin in the standing pouch 10 is preferably 90% by mass or more. From the viewpoint of achieving a higher degree of mono-materialization, the content of polyolefin resin in the standing pouch 10 is more preferably 92% by mass or more, and even more preferably 95% by mass or more.

[0114] From the viewpoint of recyclability, the content of polyethylene-based resin in the standing pouch 10 is preferably 90% by mass or more. From the viewpoint of achieving a higher degree of mono-materialization, the content of polyethylene-based resin in the standing pouch 10 is more preferably 92% by mass or more, and even more preferably 95% by mass or more.

[0115] From the viewpoint of recyclability, the content of polypropylene-based resin in the standing pouch 10 is preferably 90% by mass or more. From the viewpoint of achieving a higher degree of mono-materialization, the content of polypropylene-based resin in the standing pouch 10 is more preferably 92% by mass or more, and even more preferably 95% by mass or more.

[0116] Next, the pouring portion 20 of the standing pouch 10 will be described in detail with reference to Figures 4 and 7. Figure 7 is an enlarged plan view showing the vicinity S of the pouring portion of the standing pouch shown in Figure 4. As shown in Figures 4 and 7, the pouring portion 20 includes a pouring outlet 21, a grip tab 22, a first pouring seal portion 23, a second pouring seal portion 24, a connecting seal portion 25, an intended opening line 26, and a notch 27. The pouring portion 20 is provided adjacent to the seal portion 13a of the filling portion 13.

[0117] Spout 21 is a portion for pouring the contents from opening 21a when spout portion 20 is opened along planned opening line 26, and includes flow path 21b from storage portion 11. Spout 21 has a portion including flow path 21b defined by first pouring seal portion 23 and second pouring seal portion 24 that extend in a direction slightly oblique to the vertical direction.

[0118] The grip tab 22 is a gripping portion for pulling the spouting portion 20 when opening the spouting portion 20 to transfer the contents stored in the storage portion 11. The grip tab 22 is sealed on three sides excluding the spout 21 side. By pulling the grip tab 22 in the direction of arrow A along the intended opening line 26, the opening 21a of the spout 21 opens and the spouting portion 20 is opened. The grip tab 22 has a protruding portion 22a that protrudes toward the outside of the standing pouch 10, and the grip tab 22 is designed to be pulled from the outside toward the inside. The sealed portion of the grip tab 22 is connected to a first spout seal portion 23 and a second spout seal portion 24.

[0119] The first pouring seal portion 23 is a seal portion provided on the outer edge side of the standing pouch 10 and extending in the vertical direction, with its upper end connected to the gripping tab 22 and its lower end connected to the first seal portion 12a via a connecting seal portion 25. The second pouring seal portion 24 is a seal portion provided more inward than the first pouring seal portion 23 and extending in the vertical direction, with its upper end connected to the gripping tab 22 and its lower end connected to the seal portion 13a of the injection portion 13 via a curved portion. Similar to the first seal portion 12a and the second seal portion 12b, the first pouring seal portion 23 and the second pouring seal portion 24 are portions where the sealant layers L3 of the laminates 35A and 35B are sealed together. The widths of the first pouring seal portion 23 and the second pouring seal portion 24 in the machine direction may be, for example, 3 mm or more (or 4 mm or more).

[0120] As described above, the first pouring seal portion 23 is connected to the first seal portion 12a via the connecting seal portion 25. In this case, the angle α formed between the outer edge of the first pouring seal portion 23 and the outer edge of the connecting seal portion 25 is, for example, not less than 90 degrees and not more than 180 degrees, forming an obtuse angle.

[0121] The second pouring seal portion 24 is formed short so that the distance D2 from the base 24a connected to the seal portion 13a to the tip 24b connected to the grip tab 22 is, for example, 5 mm or more and 10 mm or less. As an example, the length D2 of the second pouring seal portion 24 may be shorter than half the length D1 of the first pouring seal portion 23. Furthermore, the second pouring seal portion 24 is formed adjacent to the seal portion 13a of the injection portion 13, and the shortest separation distance (the distance between the outer edges of the second pouring seal portion 24 and the seal portion 13a) at the point where they face each other may be, for example, 5 mm or less.

[0122] The opening line 26 is a line for tearing and cutting the pouring portion 20 when opening the pouring portion 20 to transfer the contents contained in the containing portion 11 to another container, etc. The opening line 26 is formed by a gap in the laminates 35A, 35B. The opening line 26 may be a solid line or a dashed line.

[0123] The gaps that form the intended opening line 26 are provided on both the front surface (laminate 35A) and back surface (laminate 35B) of the standing pouch 10. When the standing pouch 10 is viewed in a plane in the thickness direction, the gaps on the front surface (laminate 35A) of the standing pouch 10 are provided at positions that are substantially the same as or substantially parallel to the gaps on the back surface (laminate 35B) of the standing pouch 10. When viewed in a plane, the distance (deviation) between the gaps on the front surface (laminate 35A) of the standing pouch 10 and the corresponding gaps on the back surface (laminate 35B) of the standing pouch 10 may be 0.5 mm or less, 0.4 mm or less, 0.3 mm or less, 0.2 mm or less, or 0.1 mm or less. The distance (deviation) between the gap on the surface (laminated body 35A) of the standing pouch 10 and the corresponding gap on the back surface (laminated body 35B) of the standing pouch 10 may be the distance between the center of gravity of the gap on the surface and the center of gravity of the gap on the back surface when viewed in a plane.

[0124] The opening line 26 extends from the end of the first pouring seal portion 23 opposite the pouring outlet 21. The opening line 26 extends from the end of the second pouring seal portion 24 opposite the pouring outlet 21. In other words, the gap that constitutes the opening line 26 is also provided in the first pouring seal portion 23 and the second pouring seal portion 24. This makes the standing pouch 10 even more excellent in tearability.

[0125] The notch 27 is provided at one end of the intended opening line 26, and is the portion that serves as the starting point for opening the spouting portion 20, and is a portion that guides the user when opening the spouting portion 20. The notch 27 may have the shape of a cut, a notch, a depression, or the like. In the example shown in the figure, the notch 27 is provided immediately below the grip tab 22 on the outside of the spouting portion 20, but the notch 27 may be provided in another location as long as it can be guided to the intended opening line 26.

[0126] In the standing pouch 10, a notch 27 is provided at one end of the intended opening line 26 of the pouring portion 20. This makes it possible to guide the opening operation of the pouring portion 20, thereby improving opening performance.

[0127] In the standing pouch 10, the linear length from the base 24a to the tip 24b of the second pouring seal portion 24 of the pouring portion 20 may be 5 mm or more and 10 mm or less. When the direct length D2 of the pouring portion 20 is 5 mm or more, the refilling operation can be performed stably when the pouring portion 20 is opened and the pouring portion 20 of the standing pouch 10 is inserted into a refilling container, and the flow path 21b of the pouring portion 20 does not narrow, so the refilling operation can be performed quickly.

[0128] In standing pouch 10, the angle α formed by the outer edge along spout 21 and the outer edge of connecting seal portion 25 connecting spout 21 to first seal portion 12a is an obtuse angle. According to this embodiment, when spout 20 is opened and spout 20 of standing pouch 10 is inserted into a refill container, spout 20 can be easily fitted into the container (bottle, etc.), making the refilling operation easier.

[0129] In the standing pouch 10, the MD strength of the laminate 35 may be 200 mN / 15 mm or less. In this case, the laminate 35 is made of a softer material, which makes it easier to squeeze out the contents from the standing pouch 10 formed using the laminate 35.

[0130] In the standing pouch 10, the width in the machine direction of the first pouring seal portion 23 and the second pouring seal portion 24 of the pouring portion 20 is 3 mm or more. In this case, the rigidity of the pouring outlet 21 of the pouring portion 20 is increased, and when the pouring portion 20 of the standing pouch 10 is inserted into a refill container, pouring can be performed stably. This makes the refilling operation easier.

[0131] In the standing pouch 10, the first pouring seal portion 23 is provided on the outer edge side of the standing pouch 10, and the second pouring seal portion 24 is provided more inward than the first pouring seal portion 23, and the length D2 of the second pouring seal portion 24 is shorter than half the length D1 of the first pouring seal portion 23. The shortest separation distance D3 between the second pouring seal portion 24 and the seal portion 13a of the injection portion 13 is within 5 mm. In this case, even when a relatively soft material such as polyethylene resin is used, the rigidity of the pouring portion 20 can be ensured, making it possible to more reliably perform the refilling operation using the pouring portion 20.

[0132] In the standing pouch 10, the spout 20 has a grip tab 22 that can be gripped by a user of the standing pouch 10. The grip tab 22 protrudes toward the outside of the standing pouch 10. This makes it easier to open the spout 20.

[0133] The capacity of the standing pouch 10 may be, for example, 80 to 800 ml.

[0134] Although a packaging bag according to one embodiment has been described in detail above, the packaging bag of the present disclosure is not limited to the above embodiment. For example, in the above embodiment, a stand-up pouch was exemplified as an application of the laminate 35, but the laminate 35 may be used to manufacture other packaging bags. For example, a bag shape may be formed by folding one laminate 35 in half so that the sealant layers L3 face each other and then sealing three sides. Alternatively, a bag shape may be formed by stacking two laminates 35 so that the sealant layers L3 face each other and then heat-sealing all four sides. The packaging bag can contain contents such as food, medicine, etc. The packaging bag can be subjected to a heat sterilization treatment such as boiling. Furthermore, the laminate 35 may be replaced with a laminate 55, or another laminate according to the present disclosure.

[0135] [Manufacturing method of packaging bags] A method for manufacturing a packaging bag according to an embodiment of the present disclosure will be described in detail below. Here, a method for manufacturing a standing pouch will be described as an example of a method for manufacturing a packaging bag.

[0136] The method for manufacturing a standing pouch according to this embodiment includes the following steps (2a), (2b), (2c), (2d), (2e), (2f), (2g), and (2h) in this order. (2a) A step of preparing a first laminate constituting a main body of a standing pouch (2b) A step of preparing a second laminate constituting the bottom of a standing pouch (2c) A step of placing a second laminate between a pair of first laminates (2d) A step of forming a third seal portion that bonds the pair of main body portions and the bottom tape. (2e) locally heating an area including the boundaries between the first and second seal portions and the third seal portion; (2f) A step of forming a first seal portion and a second seal portion that bond the pair of main body portions together. (2g) A process of irradiating the first laminate with laser light to volatilize a portion of the laminate, thereby generating a void and forming a planned opening line. (2h) A step of obtaining a standing pouch by cutting the first and second laminates along a direction perpendicular to the flow direction.

[0137] <(2a) Process> In this step, a first laminate that constitutes a pair of main body portions is prepared. The first laminate may be a wound raw web. The first laminate may be, for example, laminate 30, a laminate having a laminate structure including a base layer L1, a vapor deposition layer L4, a first adhesive layer L5a, and a sealant layer L3 in this order, or any other laminate that can constitute a laminate according to the present disclosure.

[0138] <(2b) Process> In this process, a second laminate that constitutes the bottom seal portion is prepared. The second laminate may be a wound raw material. In this process, a laminate including a base layer and a sealant layer is prepared. Next, the laminate is mountain-folded so that the sealant layer is positioned on the outside. A portion of the mountain-folded laminate is then removed by punching or the like to form a notch. In this way, the second laminate is prepared.

[0139] <(2c) Process> In this step, a second laminate is placed between a pair of first laminates. The pair of first laminates may be obtained, for example, by cutting one first laminate in half. The first and second laminates are transported so that the sealant layers of the pair of first laminates face each other and the sealant layer of the second laminate faces the sealant layer of the first laminate.

[0140] <(2d) Process> In this step, a third seal is formed to bond the pair of main body portions and the bottom tape. A portion of the pair of first laminates and a portion of the second laminate are sandwiched between a pair of members and bonded by applying heat and pressure. This forms the third seal. In this step, the temperature to which the first and second laminates are heated may be, for example, 120 to 140°C. The time for which the first and second laminates are heated may be, for example, 300 to 500 milliseconds.

[0141] <(2e) Process> In this process, the region including the boundary is sandwiched between a pair of members and heated and pressurized, thereby locally heating the region. In this process, the region including the boundary is sandwiched between a pair of members and heated and pressurized. After heating and pressurizing the region, the operation of separating the first laminate and the members (hereinafter also referred to as point sealing) may be performed once or two or more times.

[0142] The point sealing pressure may be 0.2 to 0.6 MPa, the temperature may be 155 to 180° C., and the point sealing time may be 300 to 500 milliseconds.

[0143] <(2f) Process> In this process, a first seal portion and a second seal portion are formed to bond the pair of main body portions together. A portion of the pair of first laminates and a portion of the pair of second laminates are sandwiched between a pair of members and bonded by applying heat and pressure. This forms the first seal portion and the second seal portion. In this process, the temperature to which the first and second laminates are heated may be, for example, 130 to 160°C. The time for which the first and second laminates are heated may be, for example, 300 to 500 milliseconds. Examples of materials for the pair of members include rubber and metal. The materials of one member and the other member may be the same or different.

[0144] <(2g) process> In this process, the first laminate is irradiated with laser light to volatilize a portion of the laminate, thereby generating a void and providing a planned opening line. The laser light may be irradiated from the base layer side of both of the pair of first laminates, or from the base layer side of one of the pair of first laminates. By performing process (2g) after process (2f), voids can also be formed in the first pour-out seal portion and the second pour-out seal portion. As a result, the resulting standing pouch has even better tearability. The irradiated laser light, wavelength, scan speed, and output may be the same as those in process (1b) of the laminate manufacturing method according to the above embodiment.

[0145] <(2h) process> In this step, the first and second laminates are cut in a direction perpendicular to the flow direction to obtain standing pouches.

[0146] Although the method for manufacturing a stand-up pouch according to one embodiment has been described above in detail, the method for manufacturing a stand-up pouch according to the present disclosure is not limited to the above embodiment. The order of the steps may be reversed. Furthermore, the method for manufacturing a stand-up pouch according to the present disclosure may include steps other than those described above. Such steps include, for example, a step of embossing the first laminate. [Example]

[0147] The present disclosure will be described in more detail below with reference to examples, but the present disclosure is not limited to the following examples.

[0148] <Preparation of laminate and standing pouch> Example 1 The following materials were prepared for the base layer, adhesive layer, and sealant layer. Base layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "HS31", thickness: 30 μm, density: 0.94 g / cm 3 ) Adhesive layer: Urethane adhesive (DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0149] A silicon oxide (silica) vapor-deposited layer (thickness: 30 to 50 nm) was formed by vacuum deposition on one main surface of the base layer. The surface of the base layer on which the vapor-deposited layer was formed was bonded to the sealant layer via an adhesive layer (thickness: 1 to 2 μm). This produced a laminate.

[0150] Three of the obtained laminates were prepared and used as the main body and base material, respectively, to produce standing pouches with the configuration shown in Figure 4 (see Figure 5). The pouch sizes were as follows: A bag making machine was used to produce the standing pouches. ·Top and bottom: 230mm ·Width: 150mm Folding width: 40mm

[0151] In the pouring portion 20 of the standing pouch 10, a planned opening line 26 was formed along the MD. The planned opening line was formed by irradiating a carbon dioxide laser beam from the outside of the standing pouch 10. The irradiation conditions for the laser beam were as follows: The laser beam was irradiated onto the standing pouch after vertical sealing and vertical cooling, and side sealing and side cooling were performed.

[0152] Laser marker: Keyence ML-Z9510 (30W) Laser light output: Value shown in Table 1 (unit: W) Scan speed: Values ​​shown in Table 1 Laser wavelength: 10.6 μm

[0153] Example 2 The following materials were prepared for the base layer, first adhesive layer, intermediate layer, second adhesive layer, and sealant layer. Base layer: Stretched polyethylene film (thickness: 25 μm, density: 0.925 to 0.945 g / cm 3 , melting point: 120-131°C) First adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Intermediate layer: Unstretched polyethylene film (thickness: 32 μm, density: 0.95 g / cm 3 , melting point: 131℃) Second adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0154] A through hole was formed in the substrate layer by a carbon dioxide laser, and a silicon oxide vapor deposition layer was formed on one main surface of the intermediate layer by vacuum deposition.

[0155] The base layer and the surface of the intermediate layer on which the vapor deposition layer was not provided were bonded together via a first adhesive layer (thickness: 1 to 2 μm). Next, the vapor deposition layer and the sealant layer were bonded together via a second adhesive layer (thickness: 1 to 2 μm) to obtain a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0156] Example 3 The following materials were prepared for the base layer, first adhesive layer, intermediate layer, second adhesive layer, and sealant layer. Base layer: Unstretched polyethylene film (thickness: 30 μm, density: 0.94 g / cm 3 , melting point: 130.2℃) First adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Intermediate layer: Unstretched polyethylene film (thickness: 32 μm, density: 0.95 g / cm 3 , melting point: 131℃) Second adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0157] A silicon oxide vapor deposition layer was formed on one main surface of the intermediate layer by vacuum deposition.

[0158] The base layer and the surface of the intermediate layer on which the vapor deposition layer was not provided were bonded together via a first adhesive layer (thickness: 1 to 2 μm). Next, the vapor deposition layer and the sealant layer were bonded together via a second adhesive layer (thickness: 1 to 2 μm) to obtain a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0159] Example 4 The following materials were prepared for the base layer, adhesive layer, and sealant layer. Base layer: Stretched polyethylene film (thickness: 25 μm, density: 0.925 to 0.945 g / cm 3 , melting point: 120-131°C) Adhesive layer: Urethane adhesive (DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0160] A silicon oxide vapor-deposited layer (thickness: 30 to 50 nm) was formed by vacuum deposition on one main surface of the base layer. The surface of the base layer on which the vapor-deposited layer was formed was bonded to the sealant layer via an adhesive layer (thickness: 1 to 2 μm). This resulted in a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0161] Example 5 The following materials were prepared for the base layer, first adhesive layer, intermediate layer, second adhesive layer, and sealant layer. Base layer: Stretched polyethylene film (thickness: 25 μm, density: 0.925 to 0.945 g / cm 3 , melting point: 120-131°C) First adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Middle layer: Stretched polyethylene film (thickness: 25 μm, density: 0.925 to 0.945 g / cm 3 , melting point: 120-131°C) Second adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0162] A through hole was formed in the substrate layer by a carbon dioxide laser, and a silicon oxide vapor deposition layer was formed on one main surface of the intermediate layer by vacuum deposition.

[0163] The base layer and the surface of the intermediate layer on which the vapor deposition layer was not provided were bonded together via a first adhesive layer (thickness: 1 to 2 μm). Next, the vapor deposition layer and the sealant layer were bonded together via a second adhesive layer (thickness: 1 to 2 μm) to obtain a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0164] Example 6 The following materials were prepared for the base layer, adhesive layer, and sealant layer. Base layer: Unstretched polyethylene film (thickness: 32 μm) with a silicon oxide vapor deposition layer (thickness: 30 to 50 nm) Adhesive layer: Epoxy adhesive (manufactured by Mitsubishi Gas Chemical Company, product name "Maxive") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0165] The surface of the base layer on which the vapor deposition layer was formed was bonded to the sealant layer via an adhesive layer (thickness: 1 to 2 μm). A laminate was thus obtained. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0166] Example 7 The following materials were prepared for the base layer, first adhesive layer, intermediate layer, second adhesive layer, and sealant layer. Base layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "HS31", thickness 30 μm, density 0.94 g / cm 3 ) First adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Intermediate layer: Unstretched polyethylene film (manufactured by Toppan Printing Co., Ltd., product name "GL-PE", thickness 32 μm) with a silicon oxide vapor deposition layer (thickness: 30 to 50 nm) Second adhesive layer: Epoxy adhesive (manufactured by Mitsubishi Gas Chemical Company, Inc., product name "Maxive") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0167] The base layer and the surface of the intermediate layer on which the vapor deposition layer was not provided were bonded together via a first adhesive layer (thickness: 1 to 2 μm). Next, the vapor deposition layer and the sealant layer were bonded together via a second adhesive layer (thickness: 1 to 2 μm) to obtain a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0168] Example 8 The following materials were prepared for the base layer, first adhesive layer, intermediate layer, second adhesive layer, and sealant layer. Base layer: Biaxially oriented polyethylene film (manufactured by JK Materials, thickness: 25 μm, density: 0.925 to 0.945 g / cm 3 , melting point: 120-131°C) First adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Intermediate layer: Unstretched polyethylene film (manufactured by Toppan Printing Co., Ltd., product name "GL-PE", thickness 32 μm) with a silicon oxide vapor deposition layer (thickness: 30 to 50 nm) Second adhesive layer: Epoxy adhesive (manufactured by Mitsubishi Gas Chemical Company, Inc., product name "Maxive") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0169] The base layer and the surface of the intermediate layer on which the vapor deposition layer was not provided were bonded together via a first adhesive layer (thickness: 1 to 2 μm). Next, the vapor deposition layer and the sealant layer were bonded together via a second adhesive layer (thickness: 1 to 2 μm) to obtain a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0170] (Comparative Example 1) The following materials were prepared for the base layer, adhesive layer, and sealant layer. Base layer: Unstretched polyethylene film (thickness: 30 μm, density: 0.94 g / cm 3 , melting point: 130.2℃) Adhesive layer: Urethane adhesive (DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0171] A silicon oxide vapor-deposited layer (thickness: 30 to 50 nm) was formed by vacuum deposition on one main surface of the base layer. The surface of the base layer on which the vapor-deposited layer was formed was bonded to the sealant layer via an adhesive layer (thickness: 1 to 2 μm). This resulted in a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0172] (Comparative Example 2) The following materials were prepared for the base layer, adhesive layer, and sealant layer. Base layer: Unstretched polyethylene film (thickness: 30 μm, density: 0.94 g / cm 3 , melting point: 130.2℃) Adhesive layer: Urethane adhesive (DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0173] A silicon oxide vapor-deposited layer (thickness: 30 to 50 nm) was formed by vacuum deposition on one main surface of the base layer. The surface of the base layer on which the vapor-deposited layer was formed was bonded to the sealant layer via an adhesive layer (thickness: 1 to 2 μm). This resulted in a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0174] (Comparative Example 3) The following materials were prepared for the base layer, adhesive layer, and sealant layer. Base layer: Unstretched polyethylene film (thickness: 30 μm, density: 0.94 g / cm 3 , melting point: 130.2℃) Adhesive layer: Urethane adhesive (DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "LX500", thickness: 100 μm, density: 0.909 g / cm 3 , melting point: 98℃)

[0175] A silicon oxide vapor-deposited layer (thickness: 0 to 50 nm) was formed by vacuum deposition on one main surface of the base layer. The surface of the base layer on which the vapor-deposited layer was formed was bonded to the sealant layer via an adhesive layer (thickness: 1 to 2 μm). This gave a laminate.

[0176] A standing pouch 10 was obtained using the laminate in the same manner as in Example 1. In the resulting standing pouch 10, the base material layer was not torn to form a void, and a through-hole penetrating through the base material layer was formed.

[0177] Comparative Example 4 The following materials were prepared for the base layer, first adhesive layer, intermediate layer, second adhesive layer, and sealant layer. Base layer: Stretched polyethylene film (thickness: 25 μm, density: 0.925 to 0.945 g / cm 3 , melting point: 120-131°C) First adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Middle layer: Stretched polyethylene film (thickness: 25 μm, density: 0.925 to 0.945 g / cm 3 , melting point: 120-131°C) Second adhesive layer: urethane adhesive (manufactured by DIC Corporation, product name "LX500") Sealant layer: Unstretched polyethylene film (manufactured by Tamapoly Co., Ltd., product name "SE620A", thickness: 100 μm, density: 0.916 g / cm 3 , melting point: 114℃)

[0178] A through hole was formed in the base layer using a carbon dioxide laser. A through hole was formed in the intermediate layer using a carbon dioxide laser. A silicon oxide vapor deposition layer was formed on one main surface of the intermediate layer by vacuum deposition.

[0179] The base layer and the surface of the intermediate layer on which the vapor deposition layer was not provided were bonded together via a first adhesive layer (thickness: 1 to 2 μm). Next, the vapor deposition layer and the sealant layer were bonded together via a second adhesive layer (thickness: 1 to 2 μm) to obtain a laminate. Using the laminate, a standing pouch 10 was obtained in the same manner as in Example 1.

[0180] <Cross-section observation of laminate> The cross sections of the laminates produced in each example and comparative example were observed (observation magnification: 500x). Figure 8 is an image of the cut surface of the laminate obtained in Example 7. It was confirmed that a void H1 was formed between the base layer and the sealant layer in the laminates of Examples 1, 4, and 6 and Comparative Examples 1 and 2. The maximum length T1 of the void H1 in the thickness direction of the laminate and the maximum length W1 in the direction parallel to the main surface of the laminate are shown in Table 1.

[0181] In the laminates of Examples 2, 3, 5, 7, and 8 and Comparative Example 4, it was confirmed that a gap H1 was formed between the intermediate layer and the sealant layer, and a gap H2 was formed between the base material layer and the intermediate layer. The maximum length T1 of the gap H1 in the thickness direction of the laminate and the maximum length W1 in the direction parallel to the main surface of the laminate are shown in Table 1. The maximum length T2 of the gap H2 in the thickness direction of the laminate and the maximum length W2 in the direction parallel to the main surface of the laminate are shown in Table 1.

[0182] <Tear strength> The tear strength of the standing pouches of each Example and Comparative Example was measured by the trouser tearing method in accordance with JIS K7128-1. The results are shown in Table 1.

[0183] The laminates of Examples 1, 4, and 6 do not have an intermediate layer. The laminates of Examples 1, 4, and 6 are less likely to break because the base layer does not have a through-hole. The laminates of Examples 2, 3, 5, 7, and 8 have an intermediate layer. The laminates of Examples 2, 3, 5, 7, and 8 are less likely to break because the intermediate layer does not have a through-hole.

[0184] [Table 1] [Explanation of symbols]

[0185] 10...standing pouch (packaging bag), 11...storage section, 12...sealing section, 20...pouring section, 21...pouring outlet, 21a...opening, 21b...flow path, 23, 24...pouring seal section, 26...opening line, 35, 55...laminated body, H1, H2...gap, L1...base material layer, L2...intermediate layer, L3...sealant layer, L5a, L5b...adhesive layer.

Claims

1. a base layer made of a polyolefin film; a first adhesive layer; a sealant layer containing a polyolefin resin; A laminate having a laminate structure comprising the following in this order: a gap is formed between the base layer and the sealant layer; The maximum length of the void in the thickness direction of the laminate is 40 μm or more, A laminate in which the base material layer does not have a through-hole that penetrates the base material layer in the thickness direction.

2. a base layer made of a polyolefin film; a first adhesive layer; an intermediate layer made of a polyolefin film; a second adhesive layer; and a sealant layer containing a polyolefin resin; A laminate having a laminate structure comprising the following in this order: a gap is formed between the base layer and the sealant layer; The maximum length of the void in the thickness direction of the laminate is 40 μm or more, A laminate wherein the intermediate layer does not have a through-hole that penetrates through the intermediate layer in the thickness direction.

3. The laminate according to claim 2 , wherein the intermediate layer is an unstretched polyolefin film.

4. The laminate according to claim 2 , wherein the base material layer has a through-hole penetrating through the base material layer in a thickness direction.

5. The laminate according to claim 2 , wherein the second adhesive layer is formed using at least one of a urethane adhesive and an epoxy adhesive.

6. 3. The laminate according to claim 1, wherein the first adhesive layer is formed using at least one of a urethane adhesive and an epoxy adhesive.

7. The laminate according to claim 1 or 2, wherein the substrate layer is a stretched polyolefin film.

8. The laminate according to claim 1 or 2, wherein the content of the polyethylene resin is 90% by mass or more based on the total mass of the laminate.

9. A packaging bag produced by stacking the laminates according to claim 1 or 2 so that the sealant layers face each other and sealing them.

10. The packaging bag according to claim 9 , wherein the gaps are located on the front and back surfaces of the packaging bag.

11. The packaging bag according to claim 10, wherein when the packaging bag is viewed in a plan view in the thickness direction, the distance between the gap on the front surface and the gap on the back surface is 0.5 mm or less.

12. a storage section capable of storing a predetermined item; a seal formed around the housing; a pouring portion including a pouring outlet through which the contents can be poured out when the container is opened; Equipped with The packaging bag according to claim 9, wherein the gap is provided so as to form a planned opening line that defines the opening of the spout.

13. the spout portion includes a spout seal portion that defines a flow path of the spout; The packaging bag according to claim 12 , wherein the gap is provided in the pouring seal portion.

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