JP2021035754A - Laminate and packaging bag using the same - Google Patents

Abstract

To provide a laminate excellent in bag-making aptitude and dead holding ability, even using biomass polyethylene and also to provide a packaging bag using the same.SOLUTION: A laminate 10 includes a sealant layer 12 formed on a paper substrate layer 11. A basis weight P of the paper substrate layer 11 is 20 g/m2 to 99 g/m2. The sealant layer 12 includes a biomass polyethylene being a polymer of monomers containing biomass-derived ethylene, and has a biomass degree of 5% or more. The sealant layer 12 has a thickness S1 of 20 μm to 60 μm, and P, S1, and a density M1 of the sealant layer satisfies a relational expression 0.33<(S1×M1)/P<1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a laminate having a paper base material and a sealant layer, and a packaging bag using the same.

Conventionally, in paper containers such as paper cups and trays, a laminate having a paper base material layer / sealant layer structure is known, and the sealant layer is made of at least a part of a polyolefin resin such as polyethylene derived from biomass. It has been studied to reduce the use of fossil fuels as packaging materials by replacing them with biomass polyethylene, which is a polymer of monomers containing ethylene (see, for example, Patent Document 1).

JP-A-2017-196777

However, unlike a container such as a paper cup, in a so-called flexible packaging material which is composed of a paper base material layer having a low basis weight and a sealant layer and has flexibility, it is suitable for bag making due to poor filling of the seal portion. There are problems such as deterioration and insufficient dead hold.

An object of the present invention is to provide a laminate having excellent bag-making suitability and dead-holding property while using biomass polyethylene, and a packaging bag using the same, in order to solve the above problems.

The present invention solves the above problems by the following solutions. In addition, in order to facilitate understanding, the description will be given with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited thereto.

The first invention is a laminate (10) in which a sealant layer (12) is formed directly or via an anchor coat layer on a base material layer including at least a paper base material layer (11).
The paper substrate layer has a basis weight P of 20 g / m ² or more and 99 g / m ² or less.
The sealant layer contains biomass polyethylene, which is a polymer of a monomer containing ethylene derived from biomass, and has a biomass degree of 5% or more.
The sealant layer has a thickness _{S 1} is is at 20μm or 60μm or less,
A laminate in which the basis weight P of the paper base material layer, the thickness S _{1 of} the sealant layer, and the density M _{1 of the} sealant layer satisfy the following relational expression (I).
0.33 <(S ₁ x M ₁ ) / P <1 ... (I)

In the second invention, the adhesive resin layer or the adhesive layer (15) and the sealant layer (12A) are formed on the base material layer (11) including at least the paper base material layer, directly or via the anchor coat layer. It is a laminated body (10A) formed in order, and is
The paper substrate layer has a basis weight P of 20 g / m ² or more and 99 g / m ² or less.
The sealant layer and / or the adhesive resin layer contains biomass polyethylene, which is a polymer of a monomer containing ethylene derived from biomass, and the sealant layer and the adhesive resin layer have a biomass degree of 5% or more.
The total thickness _{S 4} of the thickness _{S 3} having a thickness of _{S 2} and the adhesive resin layer of the sealant layer is at 20μm or 60μm or less,
The basis weight P of the paper substrate layer, the thickness S ₂ of the sealant _layer, the density M ₂ of the sealant _layer, the adhesive resin thickness of the layer S _3, the density M ₃ of the adhesive resin _layer, but the following relationship It is a laminated body satisfying the formula (II).
0.33 <(S ₂ x M ₂ + S ₃ x M ₃ ) / P <1 ... (II)

The third invention is a pillow packaging bag (50) formed by using the laminate of the first invention or the second invention.

The fourth invention is a gusset packaging bag (70) formed by using the laminate of the first invention or the second invention.

The fifth invention is the packaging bag of the third invention or the fourth invention.
A packaging bag in which the contents contained in the packaging bag are powders or granules.

According to the present invention, it is possible to provide a laminate having excellent bag-making suitability and dead-holding property and a packaging bag using the same while using biomass polyethylene.

It is sectional drawing of the laminated body of 1st Embodiment (extrusion lamination structure). It is sectional drawing of the laminated body (polyethylene sand lamination structure) of 2nd Embodiment. It is a perspective view of the pillow packaging bag which is an example of the packaging bag using the laminated body of this invention. 3A is a plan view of FIG. 3 as seen from the back surface, FIG. 3B is a cross-sectional view taken along the line aa, and FIG. 3C is a cross-sectional view taken along the line bb. It is a perspective view of the gusset packaging bag which is an example of the packaging bag using the laminated body of this invention. 5A is a plan view of FIG. 5 seen from the back surface, FIG. 5B is a cross-sectional view taken along the line cc, and FIG. 5C is a cross-sectional view taken along the line dd.

The laminate according to the present invention will be described with reference to the drawings. Examples of cross-sectional views of the laminated body according to the present invention are shown in FIGS. 1 and 2.
<Laminated body of the first embodiment>
As shown in FIG. 1, the laminate 10 of the first embodiment, which is an example of the first invention of the present invention, has a base material layer including a paper base material layer 11 without an adhesive resin layer or an adhesive layer. The sealant layer 12 is directly formed on the surface. This embodiment has a laminated structure in which the sealant layer 12 is formed by a conventionally known extrusion coating method, and the sealant layer 12 is formed by melt extrusion on the paper base material layer 11.
Further, a pattern layer 13 and a surface layer 14 are sequentially formed on the surface of the paper base material layer 11 opposite to the sealant layer 12.
Hereinafter, each layer constituting the laminated body 10 will be described.

(Paper substrate layer)
The paper base material layer 11 is a base material layer that supports the sealant layer 12, and is flexible unlike the cup base paper for paper cups and the milk carton base paper for paper containers ^{having a basis weight of 100 g / m 2 or more.} It is a paper base material that constitutes a so-called flexible paper packaging. Specifically, the basis weight P of the paper base material is 20 g / m ² or more and 99 g / m ² or less, preferably 30 g / m ² or more and 80 g / m ² or less. When the basis weight P of the paper base material is 20 g / m ² or more and 99 g / m ² or less, the mechanical strength is strong, it has a predetermined dead hold property, and it has flexibility as a packaging bag. Examples of the paper base material layer include kraft paper, woodfree paper, coated paper, vapor-deposited paper, and paper having barrier properties (barrier paper).

<Barrier paper>
Here, for the paper to which the barrier property is imparted (barrier paper), for example, Shield Plus manufactured by Nippon Paper Industries Co., Ltd. can be applied. In the barrier paper, one or a plurality of barrier layers are formed on a paper base material such as the above-mentioned kraft paper, wood-free paper, and coated paper, and preferably, a water vapor barrier layer and a gas barrier layer are provided in this order. The water vapor barrier layer and the gas barrier layer are preferably formed by applying and drying an aqueous composition, respectively. A polymer binder, a pigment, a cross-linking agent, or the like may be added to the composition of each layer.

<< Polymer Binder >>
As the polymer used as the main component of the composition constituting the water vapor barrier layer and the gas barrier layer of the barrier paper, a resin capable of using water as a dispersion medium is suitable. The composition includes a polymer aqueous solution or an emulsion form. This polymer corresponds to a binder.

<< Water vapor barrier layer >>
As the resin contained in the water vapor barrier layer, various copolymers such as styrene / butadiene type, styrene / acrylic type, ethylene / vinyl acetate type, butadiene / methyl methacrylate type, vinyl acetate / butyl acrylate type, and maleic anhydride copolymer weight. It is possible to use a combination, an acrylic acid / methyl methacrylate-based copolymer, or the like alone or in combination of two or more.

The water vapor barrier layer preferably contains a pigment from the viewpoint of improving the water vapor barrier property and improving the adhesion between the water vapor barrier layer and the gas barrier layer. As the pigment contained in the water vapor barrier layer, an inorganic pigment or an organic pigment can be used. It is preferably an inorganic pigment. Examples of the inorganic pigment include kaolin, clay, calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, and satin white. A flat shape is suitable for the pigment.
Among these pigments, inorganic pigments such as kaolin having a flat shape can improve the barrier property of water vapor. In particular, kaolin having an average particle size of 5 μm or more and an aspect ratio of 10 or more is more preferable. By distributing the flat pigment parallel to the coating layer, the water vapor permeating into the water vapor barrier layer is blocked from moving in the thickness direction by the flat pigment, and moves around, so that the water vapor moves. The path through the water vapor barrier layer becomes longer, and the barrier property can be improved. When the aspect ratio of the pigment to be added is small, the number of times water vapor circulates in the coating layer is reduced and the distance traveled is shortened. As a result, the water vapor barrier property is lower than that of the flat and large particle size pigment. It ends up. In addition to kaolin, mica and montmorillonite can also be used as the flat pigment.

From the viewpoint of improving the water vapor barrier property and adhesion to the gas barrier layer, the water vapor barrier layer containing kaolin having an average particle size of 5 μm or more and an aspect ratio of 10 or more further contains a pigment having an average particle size of 5 μm or less. Is preferable. A structure in which a pigment having an average particle size of 5 μm or less enters between kaolins having an average particle size of 5 μm or more and an aspect ratio of 10 or more existing in multiple layers, and water vapor is forced to move along a flat surface of kaolin. Will be blocked by these small pigment particles. That is, when the water vapor barrier layer contains pigments having different flatness and average particle size, pigments having a small particle size are formed in the voids formed between adjacent flat and large particle size pigments in the water vapor barrier layer. Since it is in the filled state, the water vapor passes around the pigment and can realize a higher water vapor barrier property as compared with the water vapor barrier layer in which the pigment having a small particle size is not mixed.
It is preferable that the mixing ratio of kaolin having an average particle size of 5 μm or more and an aspect ratio of 10 or more and a pigment having an average particle size of 5 μm or less is 50/50 to 99/1 in terms of dry weight. If the ratio of kaolin having an average particle size of 5 μm or more and an aspect ratio of 10 or more is less than the above range, the distance through which water vapor circulates in the coating layer becomes short, and sufficient water vapor barrier properties cannot be obtained, which is not preferable. .. On the other hand, if the amount exceeds the above range, the voids formed by the large particle size pigment in the coating layer cannot be sufficiently filled with the pigment having an average particle size of 5 μm or less, and the water vapor barrier property is not improved, which is not preferable. ..

Pigments with an average particle size of 5 μm or less include inorganic pigments such as kaolin, clay, calcium carbonate, calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, and satin white, and organic pigments. Pigments can be used alone or in combination of two or more. Among these pigments, calcium carbonate, particularly heavy calcium carbonate, is preferable.
When the pigment is contained in the water vapor barrier layer, the blending amount of the resin and the pigment is preferably in the range of 5 to 200 parts by weight of the resin (dry weight) with respect to 100 parts by weight of the pigment (dry weight). More preferably, the amount of the resin is 20 to 150 parts by weight. In addition to resins and pigments, various commonly used auxiliaries such as dispersants, thickeners, water retention agents, defoamers, water resistant agents, dyes, and fluorescent dyes can be used for the water vapor barrier layer. It is possible.

Since the cross-linking agent causes a cross-linking reaction with the binder contained in the water vapor barrier layer, the number of bonds (cross-linking points) in the water vapor barrier layer increases. That is, the water vapor barrier layer has a dense structure, and good water vapor barrier properties can be exhibited.
The cross-linking agent contained in the water vapor barrier layer is not particularly limited, and polyvalent metal salts (copper, zinc, silver, iron, potassium, sodium, etc.) are used according to the type of binder contained in the water vapor barrier layer. Compounds in which polyvalent metals such as zirconium, aluminum, calcium, barium, magnesium and titanium are combined with ionic substances such as carbonate ions, sulfate ions, nitrate ions, phosphate ions, silicate ions, nitrogen oxides and boron oxides) , Amine compounds, amide compounds, aldehyde compounds, hydroxy acids and the like can be appropriately selected and used.
The number of copies of the cross-linking agent can be blended without particular limitation as long as it is within the range of the paint concentration and the paint viscosity that can be applied. When a styrene-based water vapor barrier resin such as styrene / butadiene or styrene / acrylic, which exhibits an excellent effect on the water vapor barrier, is used, a polyvalent metal salt should be used from the viewpoint of exhibiting the cross-linking effect. Is preferable, and potassium alum is more preferable.
The amount of the cross-linking agent added is preferably 1 to 10 parts by weight, more preferably 3 to 5 parts by weight, based on 100 parts by weight of the binder resin used for the water vapor barrier layer. If it is less than 1 part by weight, a sufficient effect cannot be sold, and if it is more than 10 parts by weight, the viscosity of the coating liquid increases remarkably, which makes coating difficult.

<< Gas barrier layer >>
Water-soluble polymers used as binder resins for coating materials that form the gas barrier layer include fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, ethylene copolymer polyvinyl alcohol, polyvinylpyrrolidone, starch, methylcellulose, carboxymethylcellulose, and alginate. Sodium or the like can be used. Among these, polyvinyl alcohol and carboxymethyl cellulose are preferable, and polyvinyl alcohol is more preferable, from the viewpoint of gas barrier property. The gas barrier means a gas barrier property and includes an oxygen barrier property.

As the pigment used for the gas barrier layer, the same pigment as the pigment used for the water vapor barrier layer can be used, and an inorganic pigment (particularly kaolin) having an average particle size of 3 μm or more and an aspect ratio of 10 or more is used. It is more preferable to use an inorganic pigment (particularly kaolin) having an average particle size of 5 μm or more and an aspect ratio of 50 or more. When the gas barrier layer contains a pigment, gas such as oxygen passes around the pigment, so that it has better gas barrier properties, especially in a high humidity atmosphere, as compared with a gas barrier layer that does not contain a pigment. It is possible to realize a gas barrier property.
The blending ratio (dry weight) of the pigment and the water-soluble polymer contained in the gas barrier layer is preferably 1/100 to 1000/100 for the pigment / water-soluble polymer. If the ratio of the pigment is out of the above range, sufficient gas barrier properties may not be exhibited.

As the cross-linking agent, the same cross-linking agent as that used for the above-mentioned water vapor barrier layer can be used. Since the hydroxyl groups of the water-soluble polymer are bonded to each other in a crosslinked structure, the amount of hydroxyl groups whose bonds are loosened (or broken) is reduced when the humidity is high, and the water resistance of the entire layer is improved. It is possible to suppress the decrease in oxygen barrier property of.
The amount of the cross-linking agent added is preferably 1 to 10 parts by weight, more preferably 3 to 5 parts by weight, based on 100 parts by weight of the resin used for the gas barrier layer. If it is less than 1 part by weight, a sufficient effect cannot be obtained, and if it is more than 10 parts by weight, the viscosity of the composition increases remarkably, which makes coating difficult.

In addition to water-soluble polymers, pigments, and cross-linking agents, various commonly used auxiliaries such as dispersants, thickeners, water-retaining agents, defoamers, water-resistant agents, dyes, and fluorescent dyes are used for the gas barrier layer. can do.

(Base layer)
In the present invention, the base material layer includes a paper base material layer. The base material layer may be composed of a plurality of layers including a layer other than paper. For example, from the outermost layer side, a barrier film such as an aluminum foil, an aluminum vapor deposition film, or a transparent vapor deposition film is included as a barrier layer such as paper / second bonding layer / barrier layer (/ means lamination). Even if it has a multi-layer structure, it is the base material layer in the present invention. That is, the structure before extrusion coating of the sealant layer is the base material layer in the present invention. As the above-mentioned second bonding layer, polyethylene or the like can be exemplified, and biomass polyethylene described later may be contained. Further, not only the polysand lamination by the second bonding layer but also the lamination may be performed by the dry laminating method via an adhesive.
Further, from the viewpoint of improving the adhesion of the sealant layer 12 to the base material layer, the base material layer, the anchor coat layer, and the sealant layer are formed by providing the anchor coat layer on the surface of the base material layer on which the sealant layer is formed. It may be laminated in order. Here, as the material used for the anchor coat layer, for example, urethane-based resin, epoxy-based resin, polyolefin resin and the like can be used. It is desirable that the anchor coat layer has a thickness of, for example, 0.1 μm or more and 1.0 μm or less.
Further, when the sealant layer 12 is directly provided on the paper base material layer of the base material layer without providing the anchor coat layer, the surface of the paper base material layer on the side where the sealant layer is formed is subjected to corona treatment, and the paper base material is treated. The adhesion of the sealant layer 12 to the layer may be improved.

(Sealant layer)
The sealant layer 12 is the innermost layer when the packaging bag is formed by using the laminated body. The sealant layer 12 contains biomass polyethylene, which can reduce the amount of fossil fuel used and reduce the environmental load. Further, since the laminate according to the present invention is not inferior to the polyethylene sealant layer produced from the raw material obtained from the conventional fossil fuel in terms of physical properties such as mechanical properties, the laminate of the conventional polyolefin resin can be used. Can be substituted. In the present invention, the "biomass polyethylene" uses a raw material derived from biomass (plant-derived) as a raw material at least in part, and it is not necessary that all the raw materials are derived from biomass.

The sealant layer 12 may be one layer or two or more layers coextruded. In the case of one layer, it may be composed of biomass polyethylene alone or may be blended with polyethylene derived from fossil fuel. In the case of a coextrusion structure having two or more layers, the innermost layer does not necessarily have to have a layer of biomass polyethylene, and for example, a structure of biomass polyethylene / fossil fuel-derived polyethylene may be used from the base material layer side of the outermost layer. Examples of other resins derived from fossil fuels include LDPE (low density polyethylene), LLDPE (linear low density polyethylene), MDPE (medium density polyethylene), and HDPE (high density polyethylene), which are blended with biomass polyethylene. It may be used as a coextrusion layer as described above.

The thickness _{S 1} of the sealant layer 12 is 20μm or more 60μm or less. As described above, when the sealant layer 12 is composed of multiple layers, it means the total thickness thereof. When the thickness S ₁ is 20 μm or more and 60 μm or less, sufficient sealing strength is obtained, the sealing portion is sufficiently filled when the packaging bag is formed, and further, when laminated with paper, an appropriate dead hold property is obtained. Also has. Further, if it is 20 μm or more and 40 μm or less, it is also excellent in hand-cutting property (opening property) when laminated with paper.

(Biomass polyethylene)
The sealant layer 12 contains biomass polyethylene, which is a polymer of a monomer containing ethylene derived from biomass, and has a biomass degree of 5% or more. The sealant layer 12 may further contain a fossil fuel-derived polyolefin or the like.

The "biomass degree" (biomass-derived carbon concentration in biomass polyethylene) is a value obtained by measuring the content of biomass-derived carbon by radiocarbon (C14) measurement. Since carbon dioxide in the atmosphere contains C14 at a fixed ratio (105.5 pMC), the C14 content in plants that grow by taking in carbon dioxide in the atmosphere, such as corn, is also about 105.5 pMC. It is known. It is also known that fossil fuels contain almost no C14. Therefore, the proportion of biomass-derived carbon can be calculated by measuring the proportion of C14 contained in all carbon atoms in the sealant layer 12. In the present invention, when the content of C14 in the sealant layer 12 is PC14, the carbon content Pbio derived from biomass can be determined as follows.
Pbio (%) = PC14 / 105.5 × 100

Theoretically, if ethylene derived from all biomass is used as the raw material of the sealant layer 12, the biomass degree is 100%, and the biomass degree of the sealant layer 12 is 100%. Further, the carbon concentration derived from biomass in the sealant layer produced only from the raw material derived from fossil fuel is 0%, and the biomass degree of the sealant layer is 0%.

The degree of biomass in the sealant layer 12 is 5% or more, preferably 10% or more, more preferably 15% or more, still more preferably 20% or more.

The density of the sealant layer 12 is preferably 0.91 g / cm ³ or more 0.93 g / cm ³ or less, more preferably 0.911 g / cm ³ or more 0.928 g / cm ³ or less, more preferably 0.915 g / cm ³ or more and 0.925 g / cm ³ or less. The density is a value measured according to the method specified in the method A of JIS K7112-1980 after performing the annealing described in JIS K6760-1980. If the density is 0.91 g / cm ³ or more 0.93 g / cm ³ or less, it is possible to facilitate processing and molding.

Biomass polyethylene is a polymer of a monomer containing ethylene derived from biomass. Since ethylene derived from biomass is used as the monomer as a raw material, the polymerized polyethylene is derived from biomass. The raw material monomer for polyethylene does not have to contain 100% by mass of ethylene derived from biomass. The monomer which is a raw material of biomass polyethylene may further contain an ethylene monomer derived from fossil fuel and / or an α-olefin monomer derived from fossil fuel, or may further contain an α-olefin monomer derived from biomass. That is, the biomass polyethylene includes biomass LLDPE in addition to biomass LDPE. In addition, biomass MDPE and biomass HDPE are also included in the biomass polyethylene of the present invention. These may be used alone or in combination of two or more.

The above-mentioned α-olefin has no particular limitation on the number of carbon atoms, but usually one having 3 to 20 carbon atoms can be used, and it is preferable that the α-olefin is butylene, hexene, or octene. Butylene, hexene, or octene can be produced by polymerization of ethylene, which is a raw material derived from biomass. Further, by containing such an α-olefin, the polymerized biomass polyethylene has an alkyl group as a branched structure, so that it can be made more flexible than a simple linear one.

Biomass polyethylene is preferably 0.91 g / cm ³ or more 0.93 g / cm ³ or less, more preferably 0.912 g / cm ³ or more 0.928 g / cm ³ or less, more preferably 0.915 g / cm ³ or more 0 It has a density of .925 g / cm ^{3 or less.} The density of biomass polyethylene is a value measured according to the method specified in the method A of JIS K7112-1980 after performing the annealing described in JIS K6760-1980. When the density of the biomass polyethylene is 0.91 g / cm ³ or more, the rigidity of the sealant layer containing the biomass polyethylene can be increased, and it can be suitably used as the inner layer of the packaging bag. Further, when the density of the biomass polyethylene is 0.93 g / cm3 or less, the transparency and mechanical strength of the polyolefin resin layer containing the biomass polyethylene can be enhanced, and it can be suitably used as the inner layer of the packaging bag.

The melt flow rate (MFR) MFR of biomass polyethylene is 0.1 g / 10 minutes or more and 10 g / 10 minutes or less, preferably 0.2 g / 10 minutes or more and 9 g / 10 minutes or less, and more preferably 1 g / 10 minutes or more. 5 g / 10 minutes or less. The MFR is a value measured by the method A under the conditions of a temperature of 190 ° C. and a load of 21.18 N in the method specified in JIS K7210-1995. When the MFR is 0.1 g / 10 minutes or more, the extrusion load during the molding process can be reduced. Further, when the MFR is 10 g / 10 minutes or less, the mechanical strength of the polyolefin resin layer containing biomass polyethylene can be increased.

As the biomass polyethylene preferably used in the present invention, low-density polyethylene derived from biomass manufactured by Braskem (trade name: SBC818, density: 0.918 ^{g / cm 3} , MFR: 8.1 g / 10 minutes, biomass degree. 95%), low-density polyethylene derived from biomass manufactured by Braskem (trade name: SPB681, density: 0.922 g / cm ³ , MFR: 3.8 g / 10 minutes, biomass degree 95%) and the like.

Laminate 10 of the present embodiment, the basis weight P of paper substrate layer, and the thickness S ₁ of the sealant layer 12, when the density M ₁ of the sealant layer 12, satisfies the following relational expression (I) ..
0.33 <(S ₁ x M ₁ ) / P <1 ... (I)

(S ₁ × M ₁ ) / P means the ratio of the weight of the sealant layer 12 to the weight of the paper base material layer 11 per unit area. In conventional paper cups and paper containers as described in Patent Document 1, this ratio is as large as 1 or more, that is, the basis weight of paper is relatively large, so that it is flexible like a flexible packaging material. Has no sex. In the present invention, by satisfying the relational expression (I), it is possible to realize the laminated body 10 having flexibility excellent in bag making suitability and dead hold property while using biomass polyethylene.

(Pattern layer)
The pattern layer 13 is a printing layer on which a pattern is printed, which is provided on the surface of the base material layer (paper base material layer 11) opposite to the sealant layer 12. Here, the pattern is a recording object of various modes that can be recorded or printed on the base material layer (paper base material layer 11), and is not particularly limited, and is not particularly limited, and is a figure, a character, a pattern, a pattern, or a symbol. , Patterns, marks, etc. are widely included. In particular, when the laminate 10 is used for a packaging bag intended to contain food, information such as a diagram of the contents, a product name of the contents, an expiration date, a manufacturing date, and a manufacturing number can be used as a pattern. The characters shown are used. Since the pattern layer 13 is laminated on the base material layer (paper base material layer 11) according to the specifications of the product and the like, the pattern layer 13 may be omitted.

The ink constituting the pattern layer 13 includes a coloring pigment and a resin, but in the present invention, a resin constituting this ink, for example, nitrocellulose may be used as a biomass-derived resin. Such inks are commercially available, and Sias HR (manufactured by DIC Graphic Corporation), which is a gravure ink containing a biomass resin component, can be appropriately used. As a result, the amount of fossil fuel-derived resin used can be further reduced.

(Surface layer)
The surface layer 14 is a layer provided on the pattern layer 13, and is a layer located on the outermost side of the container when the laminate 10 is used for the packaging bag. The surface layer 14 is formed of, for example, an overprint varnish (OP varnish), and can suppress disappearance of the pattern layer 13 due to rubbing or the like, or suppress falsification of the pattern.

The OP varnish of the surface layer 14 also contains a resin, but in the present invention, the resin constituting the OP varnish, for example, nitrocellulose may be used as a biomass-derived resin. Such inks are commercially available, and KS-10 (manufactured by DIC Graphics Corporation), which is an OP varnish containing a biomass resin component, can be appropriately used. As a result, the amount of fossil fuel-derived resin used can be further reduced.

The laminate of the first embodiment described above can be formed, for example, by the following layer structure.

1) Pattern layer / Paper base material layer / Sealant layer In this case, the paper base material layer is the base material layer, and the paper base material layer is kraft paper having a ^{basis weight of 20 g / m 2} or more and 99 g / m ^{2 or less.} .. The sealant layer is a layer containing biomass LDPE, and it is desirable that each is formed in the range of 20 μm or more and 60 μm or less.

2) Pattern layer / Paper base material layer / Anchor coat layer / Sealant layer In this case, the paper base material layer is the base material layer, and the paper base material layer has a basis weight of 20 g / m ² or more and 99 g / m ² or less. It is kraft paper. The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The sealant layer is a layer containing biomass LDPE, and it is desirable that each is formed in the range of 20 μm or more and 60 μm or less.

3) Picture layer / paper base material layer / second bonding layer / aluminum foil layer / anchor coat layer / sealant layer In this case, the base material layer is from the paper base material layer to the aluminum foil layer, and the paper base material layer and aluminum. The second bonding layer for bonding the foil layers is, for example, a polyethylene resin. The paper base material layer is kraft paper having a basis weight of 20 g / m ² or more and 99 g / m ^{2 or less.} The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The sealant layer is a layer containing biomass LDPE.
Here, it is desirable that the second bonding layer is formed in the range of 3 μm or more and 20 μm or less, the aluminum foil layer is formed in the range of 6 μm or more and 25 μm or less, and the sealant layer is formed in the range of 20 μm or more and 60 μm or less.

4) Picture layer / paper base material layer / second bonding layer / PET layer / anchor coat layer / sealant layer In this case, the paper base material layer to the PET layer is the base material layer, and the paper base material layer and the PET layer are used. The second bonding layer to be bonded is, for example, a polyethylene resin. The paper base material layer is kraft paper having a basis weight of 20 g / m ² or more and 99 g / m ^{2 or less.} The PET layer is a sheet-shaped polyethylene terephthalate resin base material. The paper substrate layer and the PET layer are joined by a dry lamination method. The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The sealant layer is a layer containing biomass LDPE.
Here, it is desirable that the second bonding layer is formed in the range of 3 μm or more and 20 μm or less, the PET layer is formed in the range of 5 μm or more and 25 μm or less, and the sealant layer is formed in the range of 20 μm or more and 60 μm or less.

5) Picture layer / paper base material layer / second bonding layer / vapor deposition film layer / anchor coat layer / sealant layer In this case, the base material layer is from the paper base material layer to the vapor deposition film layer, and the paper base material layer and vapor deposition The second bonding layer for bonding the film layer is EMAA (ethylene / methacrylic acid copolymer resin). The paper base material layer is kraft paper having a basis weight of 20 g / m ² or more and 99 g / m ^{2 or less.} The vapor-deposited film layer is a plastic film provided with an oxygen- and steam barrier layer such as a metal vapor-deposited film and an inorganic oxide (metal oxide) vapor-deposited film. Examples of the metal vapor deposition film include an aluminum vapor deposition film, and examples of the inorganic oxide (metal oxide) vapor deposition film include a silica vapor deposition film and an alumina vapor deposition film. Examples of the resin constituting the plastic film include polyethylene terephthalate (PET) and polyamide film (PA). The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The sealant layer is a layer containing biomass LDPE.
Here, it is desirable that the second bonding layer is formed in the range of 3 μm or more and 20 μm or less, the vapor-deposited film layer is formed in the range of 5 μm or more and 25 μm or less, and the sealant layer is formed in the range of 20 μm or more and 60 μm or less.

6) Picture layer / paper base material layer / second bonding layer / aluminum foil layer / third bonding layer / PET layer / anchor coat layer / sealant layer In this case, the base material layer is from the paper base material layer to the PET layer. .. For example, a urethane resin, an epoxy resin, or a polyolefin resin can be used as the third bonding layer for bonding the aluminum foil layer and the PET layer, and the aluminum foil layer and the PET layer are bonded to each other by a dry lamination method. Further, for the second bonding layer for bonding the paper base material layer and the aluminum foil layer, for example, a polyolefin resin, a urethane resin, or the like can be used. The paper base material layer is kraft paper having a basis weight of 20 g / m ² or more and 99 g / m ^{2 or less.} The PET layer is a sheet-shaped polyethylene terephthalate resin base material. The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The sealant layer is a layer containing biomass LDPE.
Here, the second bonding layer is in the range of 3 μm or more and 20 μm or less, the aluminum foil layer is in the range of 6 μm or more and 25 μm or less, the third bonding layer is in the range of 3 μm or more and 20 μm or less, and the PET layer is in the range of 5 μm or more. It is desirable that the sealant layer is formed in the range of 25 μm or less and in the range of 20 μm or more and 60 μm or less.

7) Picture layer / paper base material layer / anchor coat layer / sealant layer In this case, the paper base material layer is the base material layer. The paper base material layer is a paper (barrier paper) to which the above-mentioned barrier property is imparted, and for example, Shield Plus manufactured by Nippon Paper Industries, Ltd. is used. For example, the barrier paper may have a basis weight of 30 g / m ² or more and 99 g / m ² or less. The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The sealant layer is a layer containing biomass LDPE.
Here, it is desirable that the sealant layer is formed in the range of 20 μm or more and 60 μm or less.

Each of the above-mentioned examples of the laminates 3) to 7) has a barrier property by providing a layer having a barrier function such as an aluminum foil layer and a PET layer in addition to the paper base material layer in the base material layer. A laminated body can be realized.
In each of the above-mentioned laminated bodies 3) to 7), the second bonding layer may contain a biomass-derived resin. Further, in each example of the above-mentioned laminated body, a surface layer may be further formed on the surface of the pattern layer, if necessary. Further, in each example of the above-mentioned laminated body, the anchor coat layer may be omitted.

Next, the second laminated body according to the present invention will be described with reference to the drawings.
<Laminated body of the second embodiment>
As shown in FIG. 2, the laminate 10A of the second embodiment, which is an example of the second invention of the present invention, is a sealant layer on a base material layer including a paper base material layer 11 via a bonding layer 15. 12A is formed. This embodiment has a laminated structure in which the sealant layer 12A is formed by a conventionally known polyethylene sand lamination method, and the sealant layer 12A is separately formed as a sealant film.

The bonding layer 15 is an adhesive resin layer or an adhesive layer provided for bonding the base material layer and the sealant layer. For example, polyethylene, EMAA, or the like can be used as the adhesive resin layer. When polyethylene is used, it may contain biomass polyethylene. Further, as the adhesive layer, conventionally known ones can be used, and the adhesive layer is not particularly limited, but for example, a two-component curable adhesive composed of a main agent such as urethane or epoxy and a curing agent can be appropriately used. Can be used.

In the case of the adhesive resin layer, the bonding layer 15 is preferably formed so that the thickness is 5 μm or more and 30 μm or less, and more preferably 10 μm or more and 20 μm or less. If the thickness is less than 5 μm, the coating amount is insufficient and the thickness becomes too thin, and the base material layer and the sealant layer cannot be sufficiently bonded, which is not desirable. On the other hand, if the thickness is larger than 30 μm, the coating amount is too large and the thickness becomes too thick, which reduces the dead hold property and the hand-cutting property of the laminated body, which is not desirable.

In the case of the adhesive layer, the bonding layer 15 is preferably formed so that the dry thickness is 1 μm or more and 10 μm or less, and more preferably 2 μm or more and 5 μm or less. If the dry thickness is less than 1 μm, the coating amount is insufficient and the thickness becomes too thin, and the base material layer and the sealant layer cannot be sufficiently bonded, which is not desirable. Further, if the drying thickness is larger than 10 μm, there is a high possibility that drying will be poor, which is not desirable.

Here, from the viewpoint of improving the adhesion of the bonding layer 15 to the base material layer including the paper base material layer 11, the base material layer is provided with an anchor coat layer on the surface on which the bonding layer of the base material layer is formed. , The anchor coat layer and the bonding layer may be laminated in this order. Here, as the material used for the anchor coat layer, for example, urethane-based resin, epoxy-based resin, polyolefin resin and the like can be used. It is desirable that the anchor coat layer has a thickness of, for example, 0.1 μm or more and 1.0 μm or less.
When the bonding layer 15 is directly provided on the paper substrate layer of the substrate layer without providing the anchor coat layer, the surface of the paper substrate layer on the side where the bonding layer 15 is formed is subjected to corona treatment to form a paper base. The adhesion of the bonding layer 15 to the material layer may be improved.
The pattern layer 13 and the surface layer 14 are sequentially formed on the surface of the paper base material layer 11 opposite to the sealant layer 12A. Here, since the paper base material layer 11, the pattern layer 13, and the surface layer 14 are the same as those in the first embodiment, the same reference numerals are given and the description thereof will be omitted.

Laminate 10A of the present embodiment, when the bonding layer 15 of the adhesive resin layer, the total thickness _{S 4} of the thickness _{S 3} having a thickness of _{S 2} and the adhesive resin layer 15 of the sealant layer 12A is, in 20μm or 60μm or less It is formed. That is, in the relational expression (II) in the polyethylene sand lamination method, the "sealant layer 12A + adhesive resin layer 15" is conveniently replaced with the sealant layer 12 of the relational expression (I).

In this case, the degree of biomass is also calculated in the "sealant layer 12A + adhesive resin layer 15". Therefore, the biomass polyethylene may be used in the adhesive resin layer 15, may be used in the sealant layer 12A, or may be contained in both the sealant layer 12A + the adhesive resin layer 15.

Further, the laminate 10A of the present embodiment, the basis weight P of paper substrate layer, and the thickness S ₂ of the sealant layer 12A, and the density M ₂ of the sealant layer 12, a thickness S ₃ of the adhesive resin layer 15 , when the density _{M 3} of the adhesive resin layer 15 satisfy the following relational expression (II).
0.33 <(S ₂ x M ₂ + S ₃ x M ₃ ) / P <1 ... (II)

By satisfying the above relational expression (II), it is possible to realize the laminated body 10A having excellent bag-making suitability and dead-holding property while using biomass polyethylene, similarly to the laminated body 10 of the first embodiment.
When the bonding layer 15 is an adhesive layer, the thickness S3 of the adhesive resin layer is calculated as S3 = 0 in the above-mentioned relational expression (II). That is, as in the case of the above-mentioned relational expression (I), 0.33 <(S ₂ × M ₂ ) / P <1 is satisfied as in the case of only the sealant layer.

The laminate of the second embodiment described above can be formed, for example, by the following layer structure.

1) Pattern layer / Paper base material layer / Bonding layer / Sealant layer In this case, the paper base material layer is the base material layer, and the paper base material layer is a kraft with ^{a basis weight of 20 g / m 2} or more and 99 g / m ^{2 or less.} It is paper. The bonding layer is LDPE. The sealant layer is a layer containing biomass LDPE or biomass LLDPE.
Here, it is desirable that the bonding layer is formed in the range of 10 μm or more and 20 μm or less, and the sealant layer is formed in the range of 30 μm or more and 40 μm or less.

2) Pattern layer / Paper base material layer / Anchor coat layer / Bonding layer / Sealant layer In this case, the paper base material layer is the base material layer, and the paper base material layer has a basis weight of 20 g / m ² or more and 99 g / m. ² or less kraft paper. The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The bonding layer is LDPE. The sealant layer is a layer containing biomass LDPE or biomass LLDPE.
Here, it is desirable that the bonding layer is formed in the range of 10 μm or more and 20 μm or less, and the sealant layer is formed in the range of 30 μm or more and 40 μm or less.

3) Picture layer / paper base material layer / second bonding layer / aluminum foil layer / anchor coat layer / bonding layer / sealant layer In this case, the base material layer is from the paper base material layer to the aluminum foil layer, and the paper base material. The second bonding layer for bonding the layer and the aluminum foil layer is, for example, a polyethylene resin. The paper base material layer is kraft paper having a basis weight of 20 g / m ² or more and 99 g / m ^{2 or less.} The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The bonding layer is LDPE. The sealant layer is a layer containing biomass LDPE or biomass LLDPE.
Here, the second bonding layer is in the range of 3 μm or more and 20 μm or less, the aluminum foil layer is in the range of 6 μm or more and 25 μm or less, the bonding layer is in the range of 10 μm or more and 20 μm or less, and the sealant layer is in the range of 30 μm or more and 40 μm or less. It is desirable that each is formed within the range of.

4) Pattern layer / Paper base material layer / Second bonding layer / PET layer / Anchor coat layer / Bonding layer / Sealant layer In this case, the base material layer is from the paper base material layer to the PET layer, and the paper base material layer and The second bonding layer for bonding the PET layer is, for example, a polyethylene resin. The paper base material layer is kraft paper having a basis weight of 20 g / m ² or more and 99 g / m ^{2 or less.} The PET layer is a sheet-shaped polyethylene terephthalate resin base material. The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The bonding layer is LDPE. The sealant layer is a layer containing biomass LDPE or biomass LLDPE.
Here, the second bonding layer is in the range of 3 μm or more and 20 μm or less, the PET layer is in the range of 5 μm or more and 25 μm or less, the bonding layer is in the range of 10 μm or more and 20 μm or less, and the sealant layer is in the range of 30 μm or more and 40 μm or less. It is desirable that each be formed in a range.

5) Picture layer / paper base material layer / second bonding layer / vapor deposition film layer / anchor coat layer / bonding layer / sealant layer In this case, the base material layer is from the paper base material layer to the vapor deposition film layer, and the paper base material. The second bonding layer for bonding the layer and the vapor-deposited film layer is EMAA (ethylene / methacrylic acid copolymer resin). The paper base material layer is kraft paper having a basis weight of 20 g / m ² or more and 99 g / m ^{2 or less.} The vapor-deposited film layer is a plastic film provided with an oxygen- and steam barrier layer such as a metal vapor-deposited film and an inorganic oxide (metal oxide) vapor-deposited film. Examples of the metal vapor deposition film include an aluminum vapor deposition film, and examples of the inorganic oxide (metal oxide) vapor deposition film include a silica vapor deposition film and an alumina vapor deposition film. Examples of the resin constituting the plastic film include polyethylene terephthalate (PET) and polyamide film (PA). The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The bonding layer is LDPE. The sealant layer is a layer containing biomass LDPE or biomass LLDPE.
Here, the second bonding layer is in the range of 5 μm or more and 20 μm or less, the vapor-deposited film layer is in the range of 5 μm or more and 25 μm or less, the bonding layer is in the range of 10 μm or more and 20 μm or less, and the sealant layer is 30 μm or more and 40 μm or less. It is desirable that each is formed within the range of.

6) Picture layer / paper base material layer / second bonding layer / aluminum foil layer / third bonding layer / PET layer / anchor coat layer / bonding layer / sealant layer In this case, the base material is from the paper base material layer to the PET layer. It is a layer. For the third bonding layer for bonding the aluminum foil layer and the PET layer, for example, a urethane resin, a dry laminate adhesive of an epoxy resin, or the like can be used, and the aluminum foil layer and the PET layer are attached to each other by a dry lamination method. Be joined. Further, for the second bonding layer for bonding the paper base material layer and the aluminum foil layer, for example, polyethylene resin can be used. The paper base material layer is kraft paper having a basis weight of 20 g / m ² or more and 99 g / m ^{2 or less.} The PET layer is a sheet-shaped polyethylene terephthalate resin base material. The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The bonding layer is LDPE. The sealant layer is a layer containing biomass LDPE or biomass LLDPE.
Here, the second bonding layer is in the range of 5 μm or more and 20 μm or less, the aluminum foil layer is in the range of 6 μm or more and 25 μm or less, the third bonding layer is in the range of 1 μm or more and 10 μm or less, and the PET layer is in the range of 5 μm or more. It is desirable that the bonding layer is formed in the range of 25 μm or less, the bonding layer is formed in the range of 10 μm or more and 20 μm or less, and the sealant layer is formed in the range of 30 μm or more and 40 μm or less.

7) Picture layer / paper base material layer / anchor coat layer / bonding layer / sealant layer In this case, the paper base material layer is the base material layer. The paper base material layer is a paper (barrier paper) to which the above-mentioned barrier property is imparted, and for example, Shield Plus manufactured by Nippon Paper Industries, Ltd. is used. For example, the barrier paper may have a basis weight of 30 g / m ² or more and 99 g / m ² or less. The anchor coat layer is, for example, a urethane resin, an epoxy resin, or a polyolefin resin. The bonding layer is LDPE. The sealant layer is a layer containing biomass LDPE or biomass LLDPE.
Here, it is desirable that the bonding layer is formed in the range of 10 μm or more and 20 μm or less, and the sealant layer is formed in the range of 30 μm or more and 40 μm or less.

In each of the above-mentioned examples of the laminates 3) to 7), the barrier property is provided by providing the base material layer with a layer having a barrier function such as an aluminum foil layer and a PET layer as well as a paper base material layer. It is possible to realize a laminated body having.
In each of the above-mentioned laminated bodies 3) to 6), a biomass-derived resin may be used for the second bonding layer. Further, in each example of the above-mentioned laminated body, a surface layer may be further formed on the surface of the pattern layer, if necessary. Further, in each example of the above-mentioned laminated body, the anchor coat layer may be omitted.

Next, a packaging bag using the laminate of the present invention will be described with reference to the drawings.
The laminate 10 of the first embodiment and the laminate 10A of the second embodiment described above can be suitably used for a packaging bag for containing powder and the contents of granules, respectively. It is desirable that the capacity of the contents to be stored is 1 g or more and 200 g or less from the viewpoint of avoiding damage (tear) of the packaging bag when the packaging bag is dropped.

(Pillow packaging bag)
First, an example of a pillow packaging bag, which is an example of a packaging bag, will be described.
FIG. 3 is a perspective view of a pillow packaging bag, which is an example of a packaging bag using the laminate of the present invention.
FIG. 4 is a plan view (a) viewed from the back surface, (b) aa cross-sectional view, and (c) bb cross-sectional view in FIG.

The pillow packaging bag 50 is a pillow-type packaging bag formed by making a laminate 10 (10A) by heat sealing or the like.
As shown in FIGS. 3 and 4, the pillow packaging bag 50 has a seal portion 60 (a back seal portion 61 and an upper seal portion described later) for joining the inner surfaces (surfaces on the sealant layer 12 side) of the laminate 10 (10A). 62, a lower seal portion 63) is provided. The seal portion 60 is configured to form an accommodating portion 65 for accommodating the contents inside the pillow packaging bag 50 and seal the bag.

The pillow packaging bag 50 has a rectangular outer shape having an upper portion 52 on the upper side, a lower portion 53 on the lower side facing the upper portion 52, and a pair of side portions 54 extending from the upper portion 52 to the lower portion 53. Further, the pillow packaging bag 50 has a back surface portion 55 and a front surface portion 56 located on the opposite side thereof, and these are formed by folding back one laminated body 10 (10A).
Further, the pillow packaging bag 50 is provided with a gassho portion 51 formed by overlapping the left and right side edge edges of one laminated body 10 (10A) with each other on the back surface portion 55 side. The back surface portion 55 has a left side back surface portion 55A and a right side back surface portion 55B with the gassho portion 51 as a boundary.

The gassho portion 51 is formed so as to protrude from the back surface portion 55. In the present embodiment, as shown in FIGS. 3 and 4, the gassho portion 51 is tilted to the right side and is overlapped on the right back surface portion 55B located on the right side of the gassho portion 51. Not limited to this, the gassho portion 51 may be tilted to the left and overlapped on the left back surface portion 55A.

As shown in FIGS. 4 (b) and 4 (c), the gassho portion 51 has a left gassho portion 51A which is a side edge of one laminated body 10 (10A) and a right gassho portion 51B. The left side gassho portion 51A and the right side gassho portion 51B are joined by heat-sealing the inner surfaces (the surfaces on the sealant layer 12 side), and the back seal portion 61 is formed on the gassho portion 51.
As shown in FIGS. 3 and 4A, the back seal portion 61 is provided from the upper portion 52 to the lower portion 53 along the vertical direction of the pillow packaging bag 50. The extending direction of the back seal portion 61 is substantially orthogonal to the extending direction of the upper end edge and the lower end edge of the laminated body 10 (10A).

The upper portion 52 is provided with an upper seal portion 62 extending along the upper portion 52, and the lower portion 53 is provided with a lower seal portion 63 extending along the upper seal portion 62. The upper seal portion 62 and the lower seal portion 63 are formed by joining the inner surfaces (surfaces on the sealant layer 12 side) of the laminate 10 (10A) with each other by heat sealing.
Here, the pillow packaging bag 50 is an unsealed planned portion in which the upper seal portion 62 or the lower seal portion 63 is not heat-sealed before the contents are accommodated in the accommodating portion 65. In the present embodiment, for example, before the contents are stored, the upper portion 52 of the pillow packaging bag 50 is the planned seal portion, and after the contents are stored in the storage portion 65, the planned seal portion is heat-sealed. The upper seal portion 62 is formed, and the contents are sealed in the pillow packaging bag 50.

From the above, since the pillow packaging bag 50 described above uses the laminated body 10 (10A) having excellent dead-holding property and flexibility, the pillow packaging bag 50 can be easily made from the laminated body 10 (10A). In addition, when the pillow packaging bag 50 is opened and then the opened opening is bent and resealed, the bent state can be easily maintained.
Further, since the pillow wrapping bag 50 uses a paper base material constituting the soft paper wrapping, when it is used as a stick wrapping for wrapping sugar or the like, the upper or lower seal portion is manually separated and easily opened. be able to.
Further, since the pillow packaging bag 50 uses the laminate 10 (10A) containing biomass polyethylene, the amount of fossil fuel used can be reduced as compared with the conventional packaging bag, and the environmental load can be reduced. Can be done.

Further, the sealant layer 12 of the laminate 10 (10A) used in the pillow packaging bag 50 contains biomass polyethylene, but has mechanical properties as compared with the polyethylene sealant layer produced from a raw material obtained from fossil fuel. Since the pillow packaging bag 50 is not inferior in terms of physical properties such as the above, each sealed portion can be formed without a gap when the pillow packaging bag 50 is manufactured.
More specifically, as shown in FIG. 4C, in the lower portion 53 of the pillow packaging bag 50, the back seal portion 61 and the lower seal portion 63 overlap the gassho portion 51, the front surface portion 56, and the back surface portion 55. Like the portion, it is formed without a gap even between the folded laminated bodies 10 (10A). Similarly, in the upper portion 52 of the pillow packaging bag 50, the back seal portion 61 and the upper seal portion 62 are folded so as to be a portion where the gassho portion 51, the front surface portion 56, and the back surface portion 55 overlap. It is formed without a gap between (10A). As a result, the pillow packaging bag 50 formed of the laminated body 10 (10A) can sufficiently seal the accommodating portion 65.

(Gusset packaging bag)
Next, an example in which the above-mentioned laminate 10 of the first embodiment and the laminate 10A of the second embodiment are applied to a gusset packaging bag, which is another example of the packaging bag, will be described.
FIG. 5 is a perspective view of a gusset packaging bag, which is an example of a packaging bag using the laminate of the present invention.
6A and 6B are a plan view of FIG. 5A viewed from the back surface, a sectional view taken along the line cc, and a sectional view taken along the line dd.

The gusset packaging bag 70 is composed of a flexible rectangular laminated body 10 (10A). As shown in FIGS. 5 and 6, the gusset packaging bag 70 includes an accommodating portion 90 for accommodating the contents and a sealing portion 80 surrounding the accommodating portion 90.
The laminate 10 (10A) constituting the gusset packaging bag 70 includes a front surface portion 75 forming a front surface, a back surface portion 74 forming a back surface, a side surface portion 76 forming a gusset folding portion on the left and right sides, and a back surface portion 76. The portion 74 includes a gassho portion 71 that joins the side edge edges of one laminated body 10 (10A). That is, the gusset packaging bag 70 has a side gusset bag shape having a gusset folding portion on the side. From a different point of view, the gusset packaging bag 70 has a front surface formed by the front surface portion 75, a back surface formed by the back surface portion 74, and a side surface formed by the side gusset folding portion (side surface portion 76). ..

Here, the back surface portion 74 is provided with a gassho portion 71 in which the side edge edges of one laminated body 10 (10A) are overlapped as described above, and is more than the gassho portion 71 when viewed from the back surface side. The back surface portion on the left side is the back surface portion 74A on the left side, and the back surface portion on the right side is the back surface portion 74B on the right side.
The gassho portion 71 has a left gassho portion 71A connected to the left back surface portion 74A and a right gassho portion 71B connected to the right back surface portion 74B. It is formed by being done.
The side surface portion 76 has a left side surface portion 76A on the left side and a right side side surface portion 76B on the right side when viewed from the back surface side.

The gusset folding portion is provided on the side portion of the gusset packaging bag 70. When the contents are stored in the accommodating portion 90, the gusset folding portion is sufficiently widened as shown in FIG. Therefore, the volume of the accommodating portion 90 can be increased as compared with the case of a flat pouch having no gusset folding portion on the side portion. On the other hand, when the contents are not stored in the accommodating portion 90, the side surface portions 76 (76A, 76B) forming the gusset folding portion are folded back portions 77 (77A) toward the gassho portion 71 side as shown in FIG. , 77B). As a result, the overall thickness of the gusset packaging bag 70 is reduced.

Further, the gusset packaging bag 70 is formed of one rectangular laminated body 10 (10A) before bag making. More specifically, in order from one side edge of one laminated body 10 (10A), the left side gassho portion 71A, the left side back surface portion 74A, the left side side surface portion 76A, the front surface portion 75, the right side side surface portion 76B, and the right back surface portion. The part 74B and the right side gassho part 71B are connected to each other.
The left side gassho portion 71A and the right side gassho portion 71B are overlapped with each other so that the sealant layer 12 is located on the inner side of the container, and the laminated body 10 (10A) is heat-sealed to form the left side gassho portion 71A and the right side gassho portion 71A. A back seal portion 81 is formed to join the gassho portion 71B. As a result, the rectangular laminated body 10 (10A) is formed in a tubular shape in which opposite side edge edges are joined.
The inside of the laminated body 10 (10A) formed in a tubular shape is the accommodating portion 90.

In the lower portion 73 of the gusset packaging bag 70, the laminated body (front surface portion 75, left side surface portion 76A, back surface portion 74, right side side surface portion 76B) formed in a tubular shape is left and right as shown in FIG. 6 (c). The side surface portions 76A and 76B are joined by heat-sealing the lower part of each film in a state of being folded in half by the folded portion 77 toward the gassho portion 71 side between the front surface portion 75 and the back surface portion 74. Here, the front surface side of the side surface portion 76 folded in half by the folded portion 77 is joined to the front surface portion 75, and the back surface side is joined to the back surface portion 74. As a result, a lower seal portion 83 is formed on the lower 73 of the gusset packaging bag 70.

Similarly, in the upper portion 72 of the gusset packaging bag 70, the laminated body (front surface portion 75, left side surface portion 76A, back surface portion 74, right side side surface portion 76B) formed in a tubular shape is formed on the left and right side surface portions 76A. The 76B is joined by heat-sealing the upper part of each film in a state where the 76B is folded in half by the folded portion 77 toward the gassho portion 71 side between the front surface portion 75 and the back surface portion 74. Here, the front surface side of the side surface portion 76 folded in half by the folded portion 77 is joined to the front surface portion 75, and the back surface side is joined to the back surface portion 74. As a result, an upper seal portion 82 is formed on the upper portion 72 of the gusset packaging bag 70.

In the gusset packaging bag 70, before the contents are stored, the upper seal portion 82 or the lower seal portion 83 is a planned seal portion in an unsealed state, and the contents are stored from the planned seal portion. The contents can be sealed by accommodating in 90 and heat-sealing (joining) the planned sealing portion.

From the above, since the above-mentioned gusset packaging bag 70 uses the laminated body 10 (10A) having excellent dead-holding property and flexibility, the gusset packaging bag 70 can be easily manufactured from the laminated body 10 (10A). It can be bagged, and when the opened opening is bent and resealed after opening the gusset packaging bag 70, the bent state can be easily maintained.
Further, since the gusset packaging bag 70 uses the paper base material layer constituting the soft paper packaging, the upper or lower seal portion can be separated by hand and easily opened.
Further, since the laminate 10 (10A) forming the gusset packaging bag 70 contains biomass polyethylene, the amount of fossil fuel used can be reduced as compared with the conventional packaging bag, and the environmental load can be reduced. Can be done.

Further, the sealant layer 12 of the laminate 10 (10A) used in the gusset packaging bag 70 contains biomass polyethylene, but has mechanical properties as compared with the polyethylene sealant layer produced from a raw material obtained from fossil fuel. Since there is no inferiority in terms of physical properties such as, when the gusset packaging bag 70 is made, each sealing portion can be formed without a gap.
More specifically, as shown in FIG. 6C, in the lower portion 73 of the gusset packaging bag 70, the back seal portion 81 and the lower seal portion 83 overlap the side surface portion 76, the front surface portion 75, and the back surface portion 74. It is formed without a gap even between the folded laminated bodies 10 (10A), such as a portion or a portion where the gassho portion 71, the front surface portion 75, and the back surface portion 74 overlap. Similarly, in the upper portion 72 of the gusset packaging bag 70, the back seal portion 81 and the upper seal portion 82 are the portions where the side surface portion 76, the front surface portion 75, and the back surface portion 74 overlap, and the gassho portion 71, the front surface portion 75, and the back surface portion. Like the portion where the 74 overlaps, it is formed without a gap even between the folded laminated bodies 10 (10A). As a result, the gusset packaging bag 70 formed of the laminated body 10 (10A) can sufficiently seal the accommodating portion 90.

Hereinafter, the present invention will be described in more detail based on Examples.
[Example 1]
(Extrusion lamination configuration corresponding to the first embodiment)
As a paper base material, ^{dry thickness using kraft paper 60 g / m 2} (forest certified Nagoya bleached dragon Daio Paper Co., Ltd.) and Sias HR (manufactured by DIC Graphics Co., Ltd.), which is a front printing gravure ink for paper containing a biomass resin component. The pattern was printed at a thickness of 1 μm, and then KS-10 (manufactured by DIC Graphics Corporation) was applied as an OP (overprint) varnish on the pattern printing to a dry thickness of 1 μm. Next, on the surface opposite to the printed surface of the paper substrate, SBS818 (manufactured by Braskem, density 0.918 g / m ² , MFR = 8.1), which is a biomass low-density polyethylene (LDPE), was applied as a sealant layer at a resin temperature of 335. Extrusion coating was performed at ° C., a line speed of 100 m / min, and a thickness of 30 μm to produce a laminate having the following constitution. The biomass degree of the sealant layer was 95%, and _{the value of (S 1} × M ₁ ) / P in the formula (I) was 0.46.
<Layer structure of Example 1>
OP varnish / ink / paper base material (60 g / m ² ) / biomass LDPE (30 μm)

[Example 2]
(Extrusion lamination configuration corresponding to the first embodiment)
In Example 1, the sealant layer had the same structure as that of Example 1 except that the thickness of the biomass LDPE was 50 μm, and a laminate having the following structure was produced. The biomass degree of the sealant layer was 95%, and _{the value of (S 1} × M ₁ ) / P in the formula (I) was 0.77.
<Layer structure of Example 2>
OP varnish / ink / paper base material (60 g / m ² ) / biomass LDPE (50 μm)

[Example 3]
(Extrusion lamination configuration corresponding to the first embodiment)
In Example 1, the sealant layer has a biomass LDPE thickness of 30 μm and a petroleum-derived linear low-density polyethylene (LLDPE) kernel KC577T (manufactured by Japan Polyethylene, density 0.910 g / m ² , MFR = 15). A laminate having the following configuration was produced with the same configuration as that of Example 1 except that 15 μm of the above was co-extruded at a resin temperature of 335 ° C. and a line speed of 100 m / min. The biomass degree of the total sealant layer 45 μm was 63%, and _{the value of (S 1} × M ₁ ) / P in the formula (I) was 0.69.
<Layer structure of Example 3>
OP varnish / ink / paper substrate (60 g / m ² ) / biomass LDPE (30 μm) / LLDPE (15 μm)

[Example 4]
(Extrusion lamination configuration corresponding to the first embodiment)
In Example 1, the sealant layer was made of biomass LDPE and Novatec LC520 (manufactured by Japan Polyethylene Corporation, density 0.923 g / m ² , MFR = 3.6), which is a low-density polyethylene (LDPE) derived from petroleum, at a ratio of 1: 1. A laminate having the same structure as that of Example 1 was produced except that the mixture was blended at a ratio and extruded to a thickness of 50 μm at a resin temperature of 335 ° C. and a line speed of 100 m / min. The biomass degree of the sealant layer was 47.5%, and _{the value of (S 1} × M ₁ ) / P in the formula (I) was 0.77.
<Layer structure of Example 4>
OP varnish / ink / paper base material (60 g / m ² ) / biomass LDPE + LDPE (50 μm)

[Example 5]
(Extrusion lamination configuration corresponding to the first embodiment)
In Example 1, a laminate having the following configuration was produced with the same configuration as that of Example 1 except that the basis weight of the paper base material was 99 g / m ^{2 and the thickness of the biomass LDPE was 36 μm.} The biomass degree of the sealant layer was 95%, and _{the value of (S 1} × M ₁ ) / P in the formula (I) was 0.33.
<Layer structure of Example 5>
OP varnish / ink / paper base material (99 g / m ² ) / biomass LDPE (36 μm)

[Example 6]
(Extrusion lamination configuration corresponding to the first embodiment)
In Example 1, a laminate having the following configuration was produced with the same configuration as that of Example 1 except that the basis weight of the paper base material was 36 g / m ^{2 and the thickness of the biomass LDPE was 37 μm.} The biomass degree of the sealant layer was 95%, and _{the value of (S 1} × M ₁ ) / P in the formula (I) was 0.94.
<Layer structure of Example 6>
OP varnish / ink / paper base material (36 g / m ² ) / biomass LDPE (37 μm)

[Example 7]
(Polyethylene sand lamination configuration corresponding to the second embodiment)
As a paper base material, ^{dry thickness using kraft paper 60 g / m 2} (forest certified Nagoya bleached dragon Daio Paper Co., Ltd.) and Sias HR (manufactured by DIC Graphics Co., Ltd.), which is a front printing gravure ink for paper containing a biomass resin component. The pattern was printed at 1 μm, and then KS-10 (manufactured by DIC Graphics) was applied as OP varnish on the pattern printing to a dry thickness of 1 μm. Next, a biomass low-density polyethylene (LDPE) having a biomass degree of 95% was formed into a film having a thickness of 40 μm by an inflation method (manufactured by Dai Nippon Printing Co., Ltd.). The paper after applying OP varnish and the above-mentioned biomass LDPE 40 μm film are ^{passed through 15 μm of SBS818 (Braskem, density 0.918 g / m 2} , MFR = 8.1), which is a molten biomass low-density polyethylene (LDPE). The adhesive resin layer was formed by polyethylene sand lamination at a resin temperature of 335 ° C. and a line speed of 100 m / min to produce a laminate having the following constitution. The degree of biomass of the adhesive resin layer (15 μm) + sealant layer (40 μm) in all 55 μm is 95%, and _{the value of (S 2} × M ₂ + S ₃ × M ₃ ) / P in the relational expression (II) is 0.84. Met.
<Layer structure of Example 7>
OP varnish / ink / paper base material (60 g / m ² ) / biomass LDPE (15 μm) / biomass LDPE film (40 μm)

[Example 8]
(Extrusion lamination configuration corresponding to the first embodiment)
In Example 1, a laminate having the following configuration was produced with the same configuration as that of Example 1 except that the paper base material was barrier paper 66 g / m ^{2 (Shield Plus, manufactured by Nippon Paper Industries, Ltd.).} The biomass degree of the sealant layer was 95%, and _{the value of (S 1} × M ₁ ) / P in the formula (I) was 0.42.
<Layer structure of Example 8>
OP varnish / ink / paper base material (66 g / m ² ) / biomass LDPE (30 μm)

[Comparative Example 1]
In Example 1, the sealant layer had the same structure as that of Example 1 except that the thickness of the biomass LDPE was 18 μm, and a laminate having the following structure was produced. The biomass degree of the sealant layer was 95%, and _{the value of (S 1} × M ₁ ) / P in the formula (I) was 0.28.
<Layer structure of Comparative Example 1>
OP varnish / ink / paper base material (60 g / m ² ) / biomass LDPE (18 μm)

[Comparative Example 2]
In Example 7, a laminate having the following configuration was produced with the same configuration as that of Example 7 except that the biomass LDPE film was set to 60 μm. The degree of biomass of the adhesive resin layer (15 μm) + sealant layer (60 μm) in all 75 μm is 95%, and _{the value of (S 2} × M ₂ + S ₃ × M ₃ ) / P in the relational expression (II) is 1.15. Met.

Table 1 summarizes the laminates of the above Examples and Comparative Examples.

[Evaluation of bag making suitability]
Pillow packaging bag (width 40 mm x flow 100 mm, back seal 10 mm, top and bottom seal 10 mm) and side gusset bag (width 60 mm x flow 200 mm, side fold 10 mm, using the laminates produced in Examples and Comparative Examples, A back seal of 10 mm and an upper and lower seal of 10 m were produced.
After production, the filling of the seal portion was confirmed by the trade name "Ageless (registered trademark) seal check", and the case where there was no leakage of the check liquid was evaluated as ◯, and the case where there was leakage was evaluated as x.

[Confirmation of dead hold]
The laminated bodies of Examples and Comparative Examples were folded in half so that the sealant layer was on the outside and the base material layer was on the inside, the creases were squeezed by hand, and then the folded state was left at room temperature for 30 seconds. It was confirmed visually. The case where the bent state was maintained was evaluated as 〇, and the case where the state was about to return to the original state was evaluated as ×. The evaluation results are summarized in Table 2.

As shown in Table 2, in the examples, both the bag making suitability and the dead hold property were good. On the other hand, in Comparative Example 1, _{the value of (S 1} × M ₁ ) / P was smaller than the range of the present invention, and the sealing portion was not sufficiently filled at the position where the laminated bodies overlap. For example, in the case of a pillow packaging bag, as shown in FIG. 4C, the sealing portion is not sufficiently filled at the portion where the gassho portion 51 (51A, 51B), the front surface portion 56, and the back surface portion 55 overlap. Further, in the case of a gusset packaging bag, as shown in FIG. 6 (c), a portion where the gassho portion 71 (71A, 71B), the front surface portion 75, and the back surface portion 74 overlap, or a side portion 76 folded in two. The sealing portion is not sufficiently filled at the portion where the front surface portion 75 and the back surface portion 74 are folded.
Further, in Comparative Example 2, _{it can be understood that the value of (S 2} × M ₂ + S ₃ × M ₃ ) / P is larger than the range of the present invention and is inferior in deadhold property.

10, 10A Laminated body 11 Paper base material layer 12, 12A Sealant layer 13 Pattern layer 14 Surface layer 50 Pillow packaging bag 51 Gassho part 52 Upper part 53 Lower part 54 Side part 55 Back side part 56 Surface part 61 Back seal part 62 Upper seal part 63 Lower seal part 70 Gusset packaging bag 71 Gassho part 72 Upper part 73 Lower part 74 Back part 75 Front part 76 Side part 81 Back seal part 82 Upper seal part 83 Lower seal part

Claims (5)

A laminate in which a sealant layer is formed directly or via an anchor coat layer on a base material layer including at least a paper base material layer.
The paper substrate layer has a basis weight P of 20 g / m ² or more and 99 g / m ² or less.
The sealant layer contains biomass polyethylene, which is a polymer of a monomer containing ethylene derived from biomass, and has a biomass degree of 5% or more.
The sealant layer has a thickness _{S 1} is is at 20μm or 60μm or less,
A laminate in which the basis weight P of the paper base material layer, the thickness S _{1 of} the sealant layer, and the density M _{1 of the} sealant layer satisfy the following relational expression (I).
0.33 <(S ₁ x M ₁ ) / P <1 ... (I) A laminate in which an adhesive resin layer or an adhesive layer and a sealant layer are sequentially formed on a base material layer including at least a paper base material layer, either directly or via an anchor coat layer.
The paper substrate layer has a basis weight P of 20 g / m ² or more and 99 g / m ² or less.
The sealant layer and / or the adhesive resin layer contains biomass polyethylene, which is a polymer of a monomer containing ethylene derived from biomass, and the sealant layer and the adhesive resin layer have a biomass degree of 5% or more.
The total thickness _{S 4} of the thickness _{S 3} having a thickness of _{S 2} and the adhesive resin layer of the sealant layer is at 20μm or 60μm or less,
The basis weight P of the paper substrate layer, the thickness S ₂ of the sealant _layer, the density M ₂ of the sealant _layer, the adhesive resin thickness of the layer S _3, the density M ₃ of the adhesive resin _layer, but the following relationship A laminate that satisfies formula (II).
0.33 <(S ₂ x M ₂ + S ₃ x M ₃ ) / P <1 ... (II) A pillow packaging bag formed by using the laminate according to claim 1 or 2. A gusset packaging bag formed by using the laminate according to claim 1 or 2. In the packaging bag of claim 3 or claim 4,
A packaging bag in which the contents contained in the packaging bag are powders or granules.

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