Laminated body, manufacturing method thereof, packaging sheet made of laminated body, packaging bag, and packaging body

Abstract

To provide a heat-sealable paper-based air-permeable laminated body, the laminated body being low in environmental load and having superior packaging aptitude by realizing both flexibility and tensile elongation.SOLUTION: A laminated body includes a paper base material and an air-permeable thermoplastic resin layer, where the softness measured in compliance with JAPAN TAPPI No. 34 is 500 mN / 50 mm or less and the tensile breaking elongation measured in compliance with JIS P 8113:2006 is 3% or more.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a heat-sealable paper-based laminate. [Background technology]

[0002] Heat-sealable paper-based laminates are used in a variety of applications, for example, a thermoplastic layer on paperboard is used in the manufacture of paper cups.

[0003] Heat-sealable paper-based laminates are also used for packaging sanitary papers such as tissue paper and paper towels. For example, Patent Document 1 discloses a packaging bag for sanitary papers that is made of a laminate having an extrusion laminate layer of a thermoplastic resin on a paper base material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-102394 A Summary of the Invention [Problem to be solved by the invention]

[0005] Although paper-based laminates can reduce the environmental impact compared to laminates based on conventional petroleum-derived plastic films, it is preferable to further reduce the environmental impact.

[0006] In addition, in packaging applications, high flexibility may be preferable. In such cases, for example, the flexibility of the laminate can be increased by thinning the paper base material of the laminate, but on the other hand, the tensile elongation of the laminate decreases. When the tensile elongation decreases, the deformability against an external force decreases, and the laminate becomes more likely to break.

[0007] Furthermore, although a paper-based laminate having an extrusion laminate layer of a thermoplastic resin almost completely loses its air permeability, there are cases in which it is preferable for the package to have air permeability depending on the manner in which the package is used.

[0008] The present invention aims to provide a heat-sealable, paper-based, gas-permeable laminate that has a low environmental impact and is excellent in packaging suitability due to its compatibility between flexibility and tensile elongation. Another object of the present invention is to provide uses of the laminate. [Means for solving the problem]

[0009] The present invention relates to A paper substrate, and Air permeable thermoplastic resin layer A laminate comprising: The softness measured in accordance with JAPAN TAPPI No. 34 is 500mN / 50mm or less. The laminate has a tensile elongation at break of 3% or more as measured in accordance with JIS P 8113:2006.

[0010] The paper substrate is preferably crepe paper.

[0011] The paper base has a basis weight of 60 g / m 2 It is preferable that it is less than 1000 .mu.m.

[0012] The gas-permeable thermoplastic resin layer preferably contains an ionomer.

[0013] The amount of the gas-permeable thermoplastic resin layer is 1 g / m 2 ~8g / m 2 It is preferable that:

[0014] The laminate of the present invention preferably consists of only the paper base material and the gas-permeable thermoplastic resin layer.

[0015] The laminate of the present invention preferably has an air permeability of 200 seconds or less.

[0016] The present invention relates to a method for producing the laminate of the present invention, Coating at least one surface of the paper substrate with a dispersion of thermoplastic resin particles; and A step of drying the paper substrate after the coating to form the gas-permeable thermoplastic resin layer. The present invention also relates to a method of manufacture, comprising:

[0017] The dispersion preferably contains water.

[0018] The present invention also relates to a wrapping paper comprising the laminate of the present invention.

[0019] The present invention also relates to a packaging bag made of the packaging paper of the present invention.

[0020] The present invention relates to The packaged item, and The packaging bag of the present invention for accommodating the packaged item The present invention also relates to a package comprising:

[0021] The packaging bag is preferably heat sealed.

[0022] The packaged item is preferably sanitary paper. Effect of the Invention

[0023] The laminate of the present invention is heat-sealable due to the presence of the thermoplastic resin layer, and therefore can be suitably used for packaging applications requiring heat sealing.

[0024] The laminate of the present invention is paper-based and environmentally friendly, and can further reduce the environmental load compared to a laminate having an extrusion laminate layer of a thermoplastic resin on a paper substrate.

[0025] The laminate of the present invention has air permeability and can therefore be preferably used in cases where breathability is required.

[0026] The laminate of the present invention can achieve both flexibility and tensile elongation. Therefore, the laminate of the present invention can conform well to the shape of the packaged item, and has excellent deformability against external forces and is not easily torn. Therefore, the laminate of the present invention has excellent packaging suitability and can be suitably used as packaging paper.

[0027] Furthermore, the packaging bag of the present invention can be prevented from tearing not only during production but also after production, and the volume of the package of the present invention can be easily reduced. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is a diagram showing one embodiment of a packaging body of the present invention. [Diagram 2] FIG. 2 is an enlarged cross-sectional view of a paper substrate of an example of a laminate of the present invention. [Diagram 3] FIG. 2 is an enlarged cross-sectional view of an example of the laminate of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] The laminate of the present invention is A paper substrate, and A thermoplastic resin layer having air permeability (hereinafter referred to as "air permeable thermoplastic resin layer") It is equipped with The softness measured in accordance with JAPAN TAPPI No. 34 is 500mN / 50mm or less. The tensile elongation at break measured in accordance with JIS P 8113:2006 is 3% or more.

[0030] [Paper base material] The laminate of the present invention includes a paper substrate. There may be a plurality of paper substrates, but in order to reduce the overall layer thickness, it is preferable that there is only one paper substrate.

[0031] The paper substrate is a substrate made of paper and has a sheet shape.

[0032] The basis weight of the paper base material (measurement method: JIS P 8124

[2011] ) is 60g / m2 Less than 55 g / m is preferable. 2 Less than 50 g / m is more preferable. 2 It is even more preferable that the thickness of the paper substrate is reduced by reducing the basis weight of the paper substrate. This can increase the flexibility of the paper substrate, and therefore the flexibility of the laminate of the present invention.

[0033] On the other hand, from the viewpoint of ease of manufacturing, the basis weight of the paper base material is set to 10 g / m 2 More than 20 g / m is preferable. 2 More preferably, 30 g / m 2 More preferably, the basis weight of the paper base material is 10 g / m 2 ~60g / m 2 Less than 20 g / m is preferable. 2 ~55g / m 2 Less than 30 g / m is more preferable. 2 ~50g / m 2 Even more preferred is less than.

[0034] The thickness of the paper substrate (measurement method: JIS P 8118

[2014] ) is preferably 200 μm or less, more preferably 180 μm or less, and even more preferably 160 μm or less. The thickness of the paper substrate is preferably 40 μm or more, more preferably 60 μm or more, and even more preferably 80 μm or more. Therefore, the thickness of the paper substrate is preferably 40 μm to 200 μm, more preferably 60 μm to 180 μm, and even more preferably 80 μm to 160 μm.

[0035] The raw material for the paper base material is not particularly limited, and examples thereof include wood pulp such as softwood pulp, hardwood pulp, etc. A small amount of non-cellulose fiber such as rayon fiber, polyethylene fiber, cotton fiber, etc. may be mixed with the wood pulp.

[0036] The type of paper substrate is not particularly limited, and various types of paper can be used, but crepe paper is preferred. Crepe paper has many wrinkles, and therefore has excellent stretchability even though it is thin. Therefore, when crepe paper is used as the paper substrate, it is easy to achieve both flexibility and tensile elongation of the laminate of the present invention.

[0037] The fiber material constituting the crepe paper is preferably wood pulp, and virgin wood pulp, recycled paper pulp, or a mixture thereof can be used. Examples of wood pulp that can be used include softwood pulp such as NBKP (softwood bleached kraft pulp) and NUKP (softwood unbleached pulp), hardwood pulp such as LBKP (hardwood bleached kraft pulp) and LUKP (hardwood unbleached pulp), and mixtures of softwood pulp and hardwood pulp.

[0038] Crepe paper can be produced by a conventional method, for example, by pressing a wet paper onto the surface of a heated cylindrical Yankee dryer, allowing it to dry for a certain period of time, and then peeling the paper from the Yankee dryer with a doctor blade to perform a creping process.

[0039] [Air-permeable thermoplastic resin layer] The laminate of the present invention includes a gas-permeable thermoplastic resin layer. There may be a plurality of gas-permeable thermoplastic resin layers, but in order to reduce the overall layer thickness, it is preferable that there is only one gas-permeable thermoplastic resin layer.

[0040] The gas-permeable thermoplastic resin layer has gas permeability and is capable of passing gas therethrough. The gas-permeable thermoplastic resin layer is preferably a porous layer capable of passing gas therethrough.

[0041] Due to the presence of the gas-permeable thermoplastic resin layer, the laminate of the present invention can be heat-sealed, and for example, a packaging bag can be easily produced by heat sealing.

[0042] The gas-permeable thermoplastic resin layer does not need to be present on the entire surface of the paper base material, but may be present on at least a part (eg, an edge) of the surface of the paper base material, or may be present on the entire surface of the paper base material.

[0043] The gas-permeable thermoplastic resin layer contains at least one thermoplastic resin. A single type of thermoplastic resin may be used, or multiple types of resins may be used in combination.

[0044] The type of thermoplastic resin is not particularly limited, but from the viewpoint of flexibility, it is preferable that the thermoplastic resin is not a styrene copolymer such as a styrene-butadiene copolymer.

[0045] The thermoplastic resin is preferably in the form of particles, and more preferably water-dispersible. A water-dispersible thermoplastic resin is a thermoplastic resin that is insoluble in water but can be dispersed in water, such as in the form of an emulsion or suspension.

[0046] The type of thermoplastic resin is not particularly limited, and examples thereof include polyolefins (polyethylene, polypropylene, etc.), ethylene / vinyl acetate copolymers, polyvinyl chloride, polyvinylidene chloride, acrylic polymers, polyacrylonitrile, acrylonitrile / butadiene copolymers, ABS resins, polyurethane, polyvinylidene fluoride, fluororesins, polycarbonates, polyamides, polyacetals, polyphenylene oxides, polyesters (polyethylene terephthalate, polybutylene terephthalate, etc.), polyphenylene sulfide, polyimides, polysulfones, polyethersulfones, polyarylates, and olefin / unsaturated carboxylic acid copolymers.

[0047] In terms of strength after heat sealing, ethylene / vinyl acetate copolymer and olefin / unsaturated carboxylic acid copolymer are preferred.

[0048] Examples of the olefin / unsaturated carboxylic acid copolymer include ethylene / (meth)acrylic acid copolymer and ethylene / (meth)acrylic acid alkyl ester copolymer, and ethylene / (meth)acrylic acid copolymer is preferred. The ethylene / (meth)acrylic acid copolymer is preferably an ionomer. That is, the gas-permeable thermoplastic resin layer preferably contains an ionomer. Note that the ionomer is a general term for synthetic resins in which polymers are aggregated by utilizing the cohesive force of metal ions, and the polymer chains are ionically crosslinked by the metal ions. Examples of the ionomer include the Chemipearl S series manufactured by Mitsui Chemicals, Inc.

[0049] The gas-permeable thermoplastic resin layer is preferably not an extrusion laminate layer but a coating layer obtained by applying a dispersion of thermoplastic resin particles onto a paper substrate and drying it. From the viewpoint of further reducing the environmental load, the coating layer is preferably an aqueous coating layer obtained from an aqueous dispersion. The particle diameter of the thermoplastic resin particles can be, for example, 0.01 μm to 100 μm, preferably 0.1 μm to 10 μm.

[0050] The extrusion laminate layer is made of a thermoplastic resin film and is therefore almost completely lacking in air permeability, whereas the coating layer is made of an aggregate of thermoplastic resin microparticles and is a porous layer having numerous micropores originating from the gaps between the thermoplastic resin microparticles, and therefore is capable of possessing air permeability.

[0051] The amount (solid content) of the breathable thermoplastic resin layer is 1g / m 2 More than 2g / m is preferable. 2 More preferably, 3 g / m 2 More preferably, the amount of the gas-permeable thermoplastic resin layer is 8 g / m 2 Less than 7 g / m is preferable. 2 Less than 6 g / m is more preferable. 2 It is even more preferable that the amount of the gas-permeable thermoplastic resin layer is 1 g / m 2 ~8g / m 2 is preferred, and 2 g / m 2 ~7g / m 2 More preferably, 3 g / m2 ~6g / m 2 is even more preferred.

[0052] The gas-permeable thermoplastic resin layer may contain any additive, such as various organic or inorganic fillers, tackifiers, antioxidants, anti-fogging agents, various organic or inorganic pigments, flame retardants, crosslinking agents, ultraviolet protection agents, lubricants, and the like.

[0053] [Laminate] The laminate of the present invention has a softness of 500 mN / 50 mm or less as measured in accordance with JAPAN TAPPI No. 34. This allows the laminate of the present invention to have good flexibility. The softness of the laminate of the present invention as measured in accordance with JAPAN TAPPI No. 34 is preferably 400 mN / 50 mm or less, more preferably 300 mN / 50 mm or less, and even more preferably 200 mN / 50 mm or less.

[0054] In terms of handleability, the softness of the laminate of the present invention measured in accordance with JAPAN TAPPI No. 34 is preferably 50 mN / 50 mm or more, more preferably 100 mN / 50 mm or more, and even more preferably 150 mN / 50 mm or more.

[0055] The laminate of the present invention has a tensile breaking elongation of 3% or more as measured in accordance with JIS P 8113:2006. This allows the laminate of the present invention to have good tensile elongation. The tensile breaking elongation of the laminate of the present invention as measured in accordance with JIS P 8113:2006 is preferably 4% or more, more preferably 5% or more. Even more preferably 6% or more, even more preferably 7% or more, even more preferably 8% or more, and even more preferably 9% or more.

[0056] In terms of suppressing sagging, the tensile elongation at break of the laminate of the present invention measured in accordance with JIS P 8113:2006 is preferably 50% or less, more preferably 40% or less, even more preferably 30% or less, and even more preferably 20% or less.

[0057] The laminate of the present invention may have the above-mentioned softness and tensile elongation at break in either or both of the MD and CD directions, but it is preferred that at least the MD direction of the laminate of the present invention has the above-mentioned softness and tensile elongation at break.

[0058] The laminate of the present invention can have air permeability. The air permeability (measurement method: JIS P 8117

[2009] ) of the laminate of the present invention is preferably 200 seconds or less, more preferably 100 seconds or less, even more preferably 50 seconds or less, and even more preferably 20 seconds or less. The smaller the air permeability, the better the gas permeability.

[0059] The laminate of the present invention can be preferably used in applications requiring breathability. For example, in food packaging applications, when food in a package is heated, gases such as water vapor may be generated from the food, but since the laminate of the present invention has air permeability, the package made of the laminate of the present invention can dissipate the gas to the outside. This reduces the possibility of the packaging bag bursting, for example, even if water vapor is rapidly generated during heating in a microwave oven.

[0060] The laminate of the present invention can have layers other than the paper substrate and the gas-permeable thermoplastic resin layer, for example, an optional intermediate layer such as an adhesive layer between the paper substrate and the gas-permeable thermoplastic resin layer. However, in order to suppress the overall layer thickness, it is preferable that no other layer is interposed between the paper substrate and the gas-permeable thermoplastic resin layer. In other words, it is preferable that the paper substrate and the gas-permeable thermoplastic resin layer are in direct contact with each other.

[0061] In addition, an optional layer such as a protective layer may be provided on the surface of the paper substrate opposite to the surface on which the gas-permeable thermoplastic resin layer is present. However, in order to maintain gas permeability, it is preferable that the laminate of the present invention does not have an extrusion coating layer. In order to suppress the overall thickness and not impair the deformability of the paper substrate, it is preferable that the laminate of the present invention has only the paper substrate and the gas-permeable thermoplastic resin layer.

[0062] [Manufacturing method] The laminate of the present invention Coating at least one surface of a paper substrate with a dispersion of thermoplastic resin particles; and A step of drying the paper substrate after the coating to form a gas-permeable thermoplastic resin layer. The composition can be produced by a method comprising the steps of:

[0063] The type of dispersion medium for the dispersion liquid of the thermoplastic resin particles is not particularly limited, but may be water or an organic solvent such as ethanol, isopropyl alcohol, methyl ethyl ketone, toluene, etc. From the viewpoint of reducing the environmental load, water or a hydrophilic organic solvent such as ethanol or isopropyl alcohol is preferred, and water is more preferred.

[0064] The amount of thermoplastic resin particles in the dispersion is not particularly limited, but is preferably 3% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more. On the other hand, in terms of coatability, it is preferably 80% by mass or less, more preferably 70% by mass or less, and even more preferably 60% by mass or less. Therefore, the amount of thermoplastic resin in the dispersion is preferably 3% by mass to 80% by mass, more preferably 5% by mass to 70% by mass, and even more preferably 10% by mass to 60% by mass.

[0065] The step of applying the dispersion onto the paper substrate can be carried out using known equipment. Examples of such known coating equipment include a blade coater, a bar coater, an air knife coater, a slit die coater, a gravure coater, a microgravure coater, a roll coater, a size press, a gate roll coater, and a shim sizer. The dispersion may also be applied to the entire surface or part of the paper substrate by gravure printing, offset printing, flexographic printing, or the like.

[0066] The drying process of the paper substrate after coating can also be carried out using known equipment. Examples of such known drying equipment include hot air dryers and infrared dryers. The drying temperature and drying time can be appropriately set taking into consideration the type of thermoplastic resin, the type of dispersion medium of the dispersion liquid, the amount of thermoplastic resin particles in the dispersion liquid, etc.

[0067] [Application] The laminate of the present invention can be used for various purposes. The laminate of the present invention can be suitably used for packaging purposes.

[0068] The present invention relates to A packaging paper made of the above laminate. A packaging bag made of the above packaging paper. and A package including an item to be packaged and the above-mentioned packaging bag for containing the item to be packaged. Also relates to.

[0069] The laminate of the present invention has a gas-permeable thermoplastic resin layer and is heat-sealable, and therefore can be used as a packaging paper, and packaging bags can be easily produced by heat sealing.

[0070] The laminate of the present invention can have air permeability, and therefore can be preferably used in cases where breathability is required.

[0071] The laminate of the present invention has good flexibility and good tensile elongation. Therefore, a packaging paper made of the laminate of the present invention can conform well to the shape of the packaged item, and has excellent deformability against external forces and is not easily torn. Therefore, the laminate of the present invention has excellent packaging suitability.

[0072] The packaging bag of the present invention is easy to manufacture and can be prevented from breaking not only during but also after manufacture. In addition, since the packaging bag of the present invention has excellent conformability to the shape of the packaged item, the volume of the package made of the packaging bag can be easily reduced, and transportation, etc. can be efficiently performed.

[0073] The packaging body of the present invention uses a packaging bag made of a paper-based laminate, and therefore can address environmental issues such as environmental pollution caused by plastic remaining in the environment at the time of disposal more effectively than when packaging bags made of plastic film are used.

[0074] In particular, the paper base material constituting the packaging bag is originally an organic material derived from plants and is a carbon-neutral renewable resource, which reduces the burden on the environment. Therefore, the packaging body of the present invention is environmentally friendly.

[0075] When crepe paper is used as the paper base material, the number of contact points between the packaging bag made of the laminate of the present invention and the packaged item is reduced, so that the packaged item is prevented from getting caught on the packaging bag. This makes it easy to package packaged items such as sanitary paper, which are likely to be adversely affected by getting caught on the packaging bag.

[0076] An example of the packaging bag and packaging body of the present invention will be described below.

[0077] The packaging bag of the present invention is made of the laminate of the present invention. The shape of the packaging bag is not particularly limited, and it can be, for example, a non-box shape or a box shape.

[0078] The method for producing the package of the present invention is not particularly limited, and for example, the planar laminate described above can be deformed into a bag-like shape having a storage section, the packaged item is placed in the storage section, and then the opening of the storage section (having a gas-permeable thermoplastic resin layer) is sealed by heat sealing to produce the package.

[0079] The heat sealing temperature depends on the type of thermoplastic resin contained in the gas-permeable thermoplastic resin layer, but is preferably 80°C to 350°C, more preferably 100°C to 300°C, and even more preferably 150°C to 250°C.

[0080] The heat sealing time also depends on the type of thermoplastic resin contained in the gas-permeable thermoplastic resin layer, but is preferably 5 seconds or less, more preferably 3 seconds or less, and even more preferably 1 second or less.

[0081] The packaged item contained in the packaging of the present invention is not particularly limited, and various items such as food can be packaged, but sanitary paper can also be packaged.

[0082] Sanitary paper is paper used for the purpose of improving hygienic conditions, and examples include disposable papers such as tissue paper (also known as face wipes, cosmetic paper, etc.), tissue paper, paper towels (kitchen paper, etc.), toilet paper, and watting (cotton paper) (see, for example, Paper and Pulp Technology Handbook, 5th edition, p. 459, published January 30, 1992, edited and published by the Paper and Pulp Technology Association). Sanitary paper is also called sanitary paper (JIS P0001:1998).

[0083] As the sanitary paper, paper towels such as kitchen paper are preferred. Kitchen paper (including cooking paper) is mainly used in the kitchen for draining water and oil from meat, fish, vegetables, etc., as a cutting board cover, wiping off dishes, wiping off oil from frying pans, maintaining gas ranges and ventilation fans, wiping off dirt from dining tables, etc.

[0084] Sanitary paper is porous and has the ability to absorb liquids, such as water and oil. Therefore, sanitary paper has water-absorbent and oil-absorbent properties, and is suitable for use in the kitchen, for example.

[0085] The fiber material constituting the sanitary paper is not particularly limited, and examples thereof include natural fibers such as cotton, wood pulp, and wool, regenerated fibers such as rayon, and synthetic fibers made from synthetic polymers such as vinylon, nylon, polyester, polyethylene, polypropylene, and acrylic. These fibers may be used alone or in a mixed composite. As the fiber material constituting the sanitary paper, wood pulp is preferable, and virgin wood pulp, recycled paper pulp, or a mixture of these can be used. As the wood pulp, for example, softwood pulp such as NBKP (softwood bleached kraft pulp) and NUKP (softwood unbleached pulp) and hardwood pulp such as LBKP (hardwood bleached kraft pulp) and LUKP (hardwood unbleached pulp) can be used alone or in a suitable ratio. For example, the ratio of softwood pulp:hardwood pulp can be 1 (25%):3 (75%) to 1 (50%):1 (50%).

[0086] The basis weight of sanitary paper is not particularly limited, but the basis weight (measurement method: JIS P 8124

[2011] ) is 10 g / m 2 ~100g / m 2 is preferred, and 30 g / m 2 ~50g / m 2 In addition, the thickness of the sanitary paper is not particularly limited, but the thickness (measurement method: JIS P 8118

[2014] ) is preferably 50 μm to 300 μm, and more preferably 80 μm to 200 μm.

[0087] The sanitary paper preferably has irregularities on one or both surfaces. The irregularities may be present on a part of the surface of the sanitary paper, or may be present on the entire surface.

[0088] The unevenness is preferably imparted by embossing. The height of the unevenness (the vertical height from the bottom of the recess to the top of the protrusion) is not particularly limited, but may be, for example, 0.1 mm to 5 mm, or 1 mm to 3 mm.

[0089] The form of the sanitary paper is not particularly limited, and may be in the form of a roll of long sanitary paper wound up, but the sanitary paper is preferably in a non-roll form, more preferably in the form of a laminate of multiple flat sanitary papers, and even more preferably the flat sanitary paper is folded and stored in a packaging bag. The sanitary paper may be in the form of one sheet (so-called 1-ply) folded in half for use, or a set of two sheets (so-called 2-ply) or three sheets (so-called 3-ply) or more laminated structures folded in half for use in the same way as one sheet.

[0090] It is preferable that the sanitary paper is contained in the packaging bag in a pop-up manner, whereby after the sanitary paper is removed from the packaging bag, a part of the next sanitary paper is outside the packaging bag, making it easy to remove the next sanitary paper.

[0091] Preferably, the sanitary paper is not a garment such as a diaper, adult incontinence pants, or infant training pants.

[0092] [Example of packaging] Fig. 1 shows an embodiment of the package of the present invention, and Fig. 1(A) and Fig. 1(B) show the front side and the back side, respectively, of the embodiment of the package of the present invention. Fig. 1(C) is a cross-sectional view taken along line AA in Fig. 1(A).

[0093] In Fig. 1, 1 denotes a package, 2 denotes a packaging bag for the package, and 3 denotes a plurality of flat sanitary papers contained in a storage section within the packaging bag 2. In the example of Fig. 1, the sanitary paper 3 is in the form of a laminate.

[0094] A plurality of air holes 4 are formed in the packaging bag 2, and the air inside the packaging bag 2 can be quickly discharged to the outside. By quickly discharging the air inside the packaging bag 2 to the outside through the air holes 4, the volume of the packaging bag 2 can be quickly reduced, making it easier to pack and transport the packaging bag 2, for example.

[0095] In the embodiment shown in Figure 1, a perforation 2-1 is formed on a part of the surface of the packaging bag 2, which can form an outlet for removing the sanitary paper 3. When removing the sanitary paper 3, the perforation 2-1 is broken to form an outlet, and the sanitary paper 3 can be removed to the outside from the outlet.

[0096] In the embodiment shown in Figure 1, the sanitary paper 3 is stacked and stored in the packaging bag 2 in a so-called pop-up style, so that when one sheet of sanitary paper 3 is removed from the outlet, part of the next sheet of sanitary paper 3 can protrude from the outlet, making it easy to remove the sanitary paper 3.

[0097] Fig. 2 is an enlarged cross-sectional view of a paper base material of an example of a laminate that forms the packaging bag 2 of Fig. 1. In the example shown in Fig. 2, crepe paper is used as the paper base material 5.

[0098] As shown in Fig. 2, the paper base material 5 made of crepe paper has many wrinkles and has excellent stretchability. Therefore, the packaging bag 2 made of the paper base material 5 made of crepe paper has excellent stretchability, is highly deformable against external forces, and can maintain good tensile elongation even though it is thin, so the packaging bag 2 is not easily torn.

[0099] Fig. 3 is an enlarged cross-sectional view of an example of a laminate forming the packaging bag 2 of Fig. 1. As shown in Fig. 3, the paper base material 5 has one gas-permeable thermoplastic resin layer 6 over the entire surface of one of its surfaces. Therefore, in the example shown in Fig. 3, the packaging bag 2 can be manufactured more easily by heat-sealing the gas-permeable thermoplastic resin layer 6 at any desired location. Note that the gas-permeable thermoplastic resin layer is not in the form of a film but is porous, and in the example shown in Fig. 3, the layer thickness of the gas-permeable thermoplastic resin layer 6 is sufficiently thin so that the stretchability of the paper base material 5 can be maintained.

[0100] The gas-permeable thermoplastic resin layer 6 shown in Fig. 3 is different from an extrusion laminate layer in the form of a thermoplastic resin film, in that it is in the form of an aggregate or deposition layer of many thermoplastic resin particles, and has many fine holes, which allows it to have gas permeability. Note that in Fig. 3, for the sake of convenience, the thermoplastic resin particles are shown as spherical, but in reality, the shape of the thermoplastic resin particles is not limited to a spherical shape, and can have any particle shape.

[0101] The total thickness of the paper base material 5 and the gas-permeable thermoplastic resin layer 6 (measurement method: JIS P 8118

[2014] ) is preferably 41 μm to 200 μm, more preferably 61 μm to 180 μm, and even more preferably 81 μm to 160 μm.

[0102] The total basis weight of the paper base material 5 and the breathable thermoplastic resin layer 6 is 55 g / m 2 ~65g / m 2 is preferred, and 50 g / m 2 ~60g / m 2 More preferably, 45 g / m 2 ~55g / m 2 is even more preferred.

[0103] In the example shown in Fig. 3, the air-permeable thermoplastic resin layer 6 faces the sanitary paper 3 shown in Fig. 1(C). The surface of the air-permeable thermoplastic resin layer 6 is smoother than the surface of the paper base material 5, which prevents the sanitary paper 3 from getting caught in the packaging bag 2. Therefore, even in the example shown in Fig. 3, the sanitary paper 3 is prevented from getting caught in the packaging bag 2, making it easy to wrap the sanitary paper 3 inside the packaging bag 2.

[0104] 1, the outer surface of the packaging bag 2 is formed by a paper base material 5. Therefore, it is easy to recognize from the outside that the packaging bag 2 is made of paper. [Industrial Applicability]

[0105] The laminate of the present invention can be suitably used for packaging purposes as a packaging paper with reduced environmental impact.

[0106] Furthermore, since the laminate of the present invention has air permeability, it can be suitably used even in cases where breathability is required.

[0107] The laminate of the present invention can achieve both good flexibility and good tensile elongation, so that in packaging applications, for example, it can conform well to the shape of the packaged item and maintains its deformability against external forces, making it less likely to break. Thus, the laminate of the present invention has excellent packaging suitability.

[0108] The packaging bag and package of the present invention can be prevented from breaking not only during production but also after production, and the package of the present invention can also be reduced in volume. Therefore, the package of the present invention can be transported efficiently.

[0109] Furthermore, a packaging bag made of the laminate of the present invention can prevent sanitary paper, which is prone to fraying, from getting caught on the packaging bag, making the packaging body of the present invention suitable for packaging sanitary paper. EXAMPLES

[0110] [Example 1] A dry strength agent (DS4424 manufactured by Seiko PMC) and a wet strength agent (WS4030 manufactured by Seiko PMC) were added to a slurry containing wood pulp (freeness 410cc) made by mixing NUKP (softwood unbleached kraft pulp) and LUKP (hardwood unbleached kraft pulp) in a weight ratio of 40:60, at a concentration of 0.2% by weight relative to the wood pulp, and the mixture was spun on a cylinder Yankee papermaking machine to a thickness of 100 μm and a basis weight of 45 g / m. 2 The company produced crepe paper of The crepe paper was used as a substrate, and a dispersion of thermoplastic resin particles (Mitsui Chemicals' Chemipearl S100) was applied at 5 g / m2 using a flexographic printer. 2 A laminate was produced comprising a breathable thermoplastic resin layer by coating.

[0111] [Comparative Example 1] Base material: 40g / m 2 A laminate having a gas-permeable thermoplastic resin layer was produced in the same manner as in Example 1, except that one-sided glossy kraft paper was used.

[0112] [Comparative Example 2] Base material: 70g / m 2 A laminate having a gas-permeable thermoplastic resin layer was produced in the same manner as in Example 1, except that Clupak paper of the above formula was used.

[0113] The laminates of Example 1, Comparative Example 1, and Comparative Example 2 were evaluated by the evaluation methods described below. The results are shown in Table 1.

[0114] [Evaluation method] (Softness) Measurements were performed according to the method specified in JAPAN TAPPI No. 34. (Tensile elongation at break) Measurement was performed according to the method specified in JIS P 8113:2006. (Following ability) A horizontal pillow packaging machine (Fujikikai α wrapper 6) was used to fill and package the paper towels. Products that could be used without wrinkles during packaging were rated as ◯, and products that wrinkled during packaging were rated as ×. (tear) A horizontal pillow packaging machine (Fujikikai α wrapper 6) was used to fill and package the paper towels. Packaging that did not tear during packaging and could be used was rated as ◯, while packaging that broke during packaging was rated as ×.

[0115] [Table 1]

[0116] The laminate of Example 1, which has a softness of 500 mN / 50 mm or less as measured in accordance with JAPAN TAPPI No. 34 and a tensile elongation at break of 3% or more as measured in accordance with JIS P 8113:2006, has good conformability to the packaged items, is not torn during packaging, and has good packaging suitability.

[0117] On the other hand, the laminate of Comparative Example 1, which had a softness of more than 500 mN / 50 mm measured in accordance with JAPAN TAPPI No. 34 and a tensile breaking elongation of less than 3% measured in accordance with JIS P 8113: 2006, broke during packaging. Also, the laminate of Comparative Example 2, which had a tensile breaking elongation of 3% or more measured in accordance with JIS P 8113: 2006 but a softness of more than 500 mN / 50 mm measured in accordance with JAPAN TAPPI No. 34, had poor conformability to the packaged items. [Explanation of symbols]

[0118] 1 package 2 packaging bag 3. Sanitary Paper 4 Air Vents 5 Paper base material 6 Air-permeable thermoplastic resin layer

Claims

1. A paper substrate, and Air permeable thermoplastic resin layer A laminate comprising: The softness measured in accordance with JAPAN TAPPI No. 34 is 500 mN / 50 mm or less; A laminate having a tensile elongation at break of 3% or more as measured in accordance with JIS P 8113:2006.

2. The laminate of claim 1 , wherein the paper substrate is a crepe paper.

3. The paper base material has a basis weight of 60 g / m ２ The laminate of claim 1 , wherein the thickness is less than 1 mm.

4. The laminate of claim 1 , wherein the breathable thermoplastic layer comprises an ionomer.

5. The amount of the gas-permeable thermoplastic resin layer is 1 g / m ２ ~8g / m ２ The laminate according to claim 1 ,

6. 2. The laminate according to claim 1, which consists essentially of the paper base material and the gas-permeable thermoplastic resin layer.

7. 2. The laminate according to claim 1, which has an air permeability of 200 seconds or less.

8. A method for producing the laminate according to claim 1, comprising the steps of: Coating at least one surface of the paper substrate with a dispersion of thermoplastic resin particles; and A step of drying the paper substrate after the coating to form the gas-permeable thermoplastic resin layer. A manufacturing method comprising:

9. The method of claim 8 , wherein the dispersion comprises water.

10. A wrapping paper comprising the laminate according to claim 1.

11. A packaging bag made of the packaging paper according to claim 10.

12. The packaged item, and The packaging bag according to claim 11, which contains the packaged item. A packaging body comprising:

13. The package of claim 12, wherein the packaging bag is heat sealed.

14. The package according to claim 12, wherein the packaged item is sanitary paper.

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