JP2016193765A - Laminate for paper container for liquid, and paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gable-top type paper container for liquid storing alcoholic beverage which facilitates disassembly of a used empty container, and particularly, keeps strength and durability of the paper container for liquid, facilitates disassembly of a used empty container, and facilitates recycling.SOLUTION: There is provided a laminate which uses paper board as a substrate layer, and has surface layer having thermal fusion property/substrate layer/intermediate layer having gas barrier properties/sealant layer sequentially laminated, where the sealant layer is formed of a layer formed of a polyethylene resin, and a resin composition formed by blending a polyethylene resin, a polypropylene resin and a thermoplastic elastomer, and has a layer on which a sea-island structure is formed provided thereon, and a blending ratio of the thermoplastic elastomer is 10-50 wt.% based on the resin composition.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a liquid paper container used for liquid contents such as alcoholic beverages, fruit juice beverages, seasonings and kitchen detergents, and more particularly to a liquid paper container that facilitates dismantling of an empty container after use.

  Conventionally, liquid paper containers such as alcoholic beverages and fruit juice beverages are often used in a gable top shape with a gable roof at the top. As shown in FIG. 2, the liquid container includes a top seal portion A, a top portion B, a side wall portion C, and a bottom portion D. The top portion B has a gable roof shape and the side wall portion C has a quadrangular prism shape. Further, if necessary, an inclined plate at the top B of the front panel is provided with a plastic plug 40 protruding.

  Recently, separation and recycling of empty containers of liquid paper containers after use have been promoted due to environmental conservation problems. However, in consideration of long-term storage of the contents, the top seal portion cannot be opened in a liquid paper container using a gas barrier layer as an intermediate layer unlike a milk pack having a low gas barrier property. Since the seal of the top seal portion is strong, it has been difficult to open the top seal portion by hand and dismantle the container. It was also difficult to remove the plastic spout from the liquid paper container because the seal was strong.

  At present, in order to recycle the empty container of the liquid paper container, for example, squeeze from the stopper 40 of the empty container, cut to the lower part along the folding line, cut one side so that the roof part and the lower part are not separated, After washing, a method is generally used in which the periphery of the plug portion is cut into a triangular shape, the roof portion is flattened, and then dried and placed in a collection box.

  In order to improve such a problem, a liquid paper container that has been made as easy to dismantle as possible has been proposed.

  According to Patent Document 1, a part of the inner surface of the top seal plate connected to the upper part of the rectangular top plate and a part of the inner and outer surfaces of the folded top seal plate connected to the upper part of the folded isosceles triangular plate, Pull out the top seal part, which is coated with easy-peelable dies for container dismantling and heat-sealed with the top seal plate and the folded top seal plate, while peeling through the release layer, and open the top part Further, the square bottom plate at the bottom portion is cut open, opened in a square shape, and disassembled.

  However, it is easy to peel off by applying a release agent to a part of the seal part. For example, the release agent is applied to the contents of alcohol such as liquor by dropping the container or vibration during transportation. There was a problem that the part which was done peels.

  According to Patent Document 2, when a packaging material provided with an outermost layer and an innermost layer made of resin is formed into a predetermined shape and fused and sealed by a heated portion, a fusion force suppressing portion with a reduced fusion force is provided. There are proposals to make it easier to form and open.

  However, when heat-sealing into a sealed container, it is difficult to manage the fusing force because it partially reduces the fusing force of the resin itself in the seal portion. Decreasing the seal strength and facilitating peeling has a problem that the fusion force suppressing portion peels off due to dropping of the container during transportation or vibration.

JP 2008-87771 A JP 2007-168851 A

  An object of the present invention is to make it possible to easily disassemble used empty containers in a gable-top type liquid paper container containing alcohol and the like. In particular, the strength and durability of the liquid paper container is maintained, the used empty container is easily disassembled, and is easily recycled.

  The invention according to claim 1 of the present invention is a laminate in which a paperboard is used as a base material layer, and a surface layer having a heat-fusible property / a base material layer / an intermediate layer having a gas barrier property / a sealant layer are sequentially laminated. The sealant layer is composed of a layer made of a polyethylene resin and a resin composition in which a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer are blended, and a layer in which a sea-island structure is formed is provided. It is a laminated body for liquid paper containers characterized in that the blending ratio is 10 to 50% by weight with respect to the resin composition.

  The invention according to claim 2 of the present invention comprises a layer composed of a polyethylene resin of the sealant layer and a resin composition in which a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer are blended, and a layer in which a sea-island structure is formed. The laminate for a liquid paper container according to claim 1, wherein the laminate is laminated without using an adhesive.

  The invention according to claim 3 of the present invention is the liquid paper container according to claim 1 or 2, wherein the thermoplastic elastomer is an ethylene / α-olefin copolymer or a polybutene-1 resin. It is a laminated body.

  The invention according to claim 4 of the present invention comprises a laminate in which a paperboard is used as a base material layer, and a surface layer having a heat-fusible property / a base material layer / an intermediate layer having a gas barrier property / a sealant layer are sequentially laminated. In addition, in the liquid paper container with the sealant layer being an inner surface and a gable roof shape at the top, the sealant layer is a resin composition comprising a layer made of polyethylene resin, polyethylene resin, polypropylene resin, and thermoplastic elastomer And a layer having a sea-island structure is provided, and a blending ratio of the thermoplastic elastomer is 10 to 50% by weight with respect to the resin composition.

  The invention according to claim 5 of the present invention is a layer formed of a polyethylene resin of the sealant layer and a resin composition in which a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer are blended, and a layer in which a sea island structure is formed. The liquid paper container according to claim 4, wherein the liquid paper container is laminated without using an adhesive.

  The liquid paper container of the present invention is a gable top type liquid paper container in which a laminated board comprising a paperboard as a base material layer and comprising a surface layer having a heat-fusible property / a base material layer / an intermediate layer having a barrier property / a sealant layer is formed. It is. In particular, by forming a seal layer having an easy peel property on the liquid contact side of the paper container, the used empty container can be easily disassembled. In particular, it can be easily disassembled by hand without using a pinch or the like.

According to Claims 1 and 4 of the present invention, there is provided a laminate in which a paperboard is used as a base material layer, and a surface layer having a heat-fusible property / a base material layer / an intermediate layer having a gas barrier property / a sealant layer are sequentially laminated. In the liquid paper container in which the blank of the laminated body has the sealant layer as an inner surface and the top is folded and formed into a gable roof shape, the sealant layer includes at least a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer. It consists of a resin composition, The compounding ratio of the said thermoplastic elastomer is 10 to 50 weight% with respect to the said resin composition, It is characterized by the above-mentioned. By forming a resin layer composition in which at least a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer are blended in the sealant layer, an easy peel property is expressed and the used empty container is easily disassembled. .

  In particular, by blending a polyethylene resin and a polypropylene resin in the sealant layer, easy peel properties can be expressed. By using resins that are not compatible with each other, a sea-island structure is created and easy peel properties are expressed. Further, by further blending the thermoplastic elastomer, the cohesive force and easy peel property of the sealant layer, particularly the stability of cohesive failure can be improved. In particular, the blending ratio of the thermoplastic resin elastomer is preferably 10 to 50% by weight with respect to the resin composition. If it exceeds 50% by weight, the cohesive force becomes weak and the sealing strength tends to be lowered, which is not preferable. On the other hand, if it is less than 10% by weight, the sealing strength becomes high or a stringing phenomenon occurs at the time of peeling, so that stable easy peel properties cannot be obtained. The cohesive force varies depending on the blending ratio of the thermoplastic elastomer, and the stability of the easy peel property varies accordingly. Therefore, the blending ratio is preferably 10 to 40% by weight. If it is this range, it has seal strength and moderate easy peel property, and can be used practically.

Incidentally, the sealant layer, consist of coextruded multilayer films of two bilayer and said polyethylene resin resin composition. By forming the sealant layer by coextrusion, the sealant layer becomes a stable film. In particular, a resin layer composition containing a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer may be formed as a single layer, but it can be stably formed by coextrusion.

  In addition, it is preferable that the compounding ratio of the said polypropylene resin is 10 weight% with respect to the said resin composition. In a state where the film is formed as a sealant layer, the polyethylene resin and the polypropylene resin have a sea-island structure and develop an easy peel property at the time of peeling. In particular, when the mixing ratio is 10%, easy peel properties can be obtained stably.

  According to claim 3 of the present invention, the thermoplastic elastomer is an ethylene / α-olefin copolymer resin or a polybutene-1 resin. In particular, when the thermoplastic elastomer uses an ethylene / α-olefin copolymer resin or a polybutene-1 resin, it is possible to provide a stable seal strength and an easy peel property. In addition, stable film forming properties can be obtained.

  Moreover, it is preferable that the said intermediate | middle layer is a polyethylene terephthalate film which vapor-deposited silicon oxide or magnesium oxide. In order to recycle the paper container, a polyethylene terephthalate film deposited with silicon oxide or magnesium oxide is laminated on the intermediate layer. A paper container in which an intermediate layer in which an aluminum foil is bonded to a polyethylene terephthalate film is laminated is not suitable for recycling. In addition, there is a problem that foreign matter (metal) mixed in and attached to contents, paper containers, etc. cannot be detected by a metal detector. There is no problem if a polyethylene terephthalate film having silicon oxide or magnesium oxide deposited on the intermediate layer is used.

The liquid paper container of the present invention uses a paperboard as a base material layer, and forms a blank of a laminate composed of a surface layer having a heat-fusible property / a base material layer / an intermediate layer having a barrier property / a sealant layer. It is a liquid paper container. By adding an easy peel property to the sealant layer, the empty container after use is easily disassembled. In particular, while maintaining the strength and durability of the paper container, it is possible to easily open the top seal portion and remove the plug by hand.

It is explanatory drawing of the blank which shows an example of the state of the surface of a liquid paper container. It is explanatory drawing which shows an example of a liquid paper container (with a stopper). It is explanatory drawing which shows an example before opening of the top seal part of a liquid paper container. It is explanatory drawing which shows an example in the middle of opening of the top seal part of a liquid paper container. It is explanatory drawing which shows an example after opening of the top seal part of a liquid paper container. It is sectional drawing which shows an example of a laminated body. It is sectional drawing which shows an example of the state which carried out easy peel.

  Hereinafter, an embodiment of the present invention will be described in detail.

  FIG. 1 is an explanatory diagram of a blank showing an example of the state of the surface of a liquid paper container. In the blank 20, a back seal panel 110, a left side panel 120, a front panel 130, a right side panel 140, and a back panel 150 are connected via a fold line 160. A top seal plate E that forms a top seal portion A is provided on each of the top panel 130 and the back panel 150, and a folding plate is provided on each of the left panel 120 and the right panel 140, and above the folding plate. A top seal plate E is provided for each. In addition, bottom portions D that are molded and sealed are formed below the back seal panel 110, the left panel 120, the front panel 130, the right panel 140, and the back panel 150, respectively. Further, a plug opening 30 for attaching a plug is formed at the top B of the front panel.

  FIG. 2 is an explanatory view showing an example of a liquid paper container (with a stopper). The blank of FIG. 1 is molded into a gable top type liquid paper container. The outer surface of the back seal panel 110 of the blank 20 and the inner surface of the back panel 150 are heat-sealed to form a sleeve (not shown), this sleeve is attached to a liquid filling machine, and the bottom D is formed. Then, heat sealing and sealing are performed, the liquid content is filled, the top portion B is bent, and the top seal portion A is heat-sealing to prepare the liquid paper container 50. The liquid container 50 includes a top seal part A, a top part B, a side wall part C, and a bottom part D. The top portion B has a gable roof shape and the side wall portion C has a quadrangular prism shape. A plastic spigot 40 protrudes from the inclined plate at the top B, and a cap 41 is attached. This liquid paper container is tightly sealed to prevent leakage of contents or bag breakage.

  FIG. 3 is an explanatory diagram illustrating an example of the liquid paper container before opening the top seal portion. It is explanatory drawing explaining the operation | work for disassembling a used empty container. It is a top view of a liquid paper container. The top seal plates E of the left panel 120, the front panel 130, the right panel 140, and the back panel 150 are sealed. In this plan view, top seal portions A of the front panel 130 and the back panel 150 are formed. A plug 40 is provided on the rectangular plate portion of the front panel 130, and a cap 41 is attached.

  FIG. 4 is an explanatory view showing an example of a halfway opening of the top seal portion of the liquid paper container. It is explanatory drawing which shows an example in the middle of opening of the top seal part A of the liquid paper container of this invention. First, the left top seal portion 120A that is folded and heat-sealed and the top seal portion 140A of the right panel are peeled in the opening direction shown in a and b.

FIG. 5 is an explanatory diagram showing an example after opening the top seal portion of the liquid paper container. For example, as shown in FIG. 4, the left half of the top seal portion 130A of the front panel 130 where the inner surfaces are heat-sealed, the right half of the top seal portion 120A of the left panel 120, and the inner surfaces are heat-fused. Grasp the right half of the top seal portion 140A of the right panel 140 and the left half of the top seal portion 150A of the back panel 150 with both hands, and pull outward to open in the opening direction shown in c and d. To do. Similarly, it is opened in the opening direction indicated by e and f. Since the easy peel property is added to the sealant layer, the seal portion can be easily opened by hand.

  FIG. 6 is a cross-sectional view illustrating an example of a laminated body. The laminated body 1 of the liquid paper container is, for example, a polyethylene layer 2 / base material layer 3 / polyethylene layer 4 / gas barrier layer 5 / adhesive layer 6 / sealant layer 7 in order from the surface. Since the sealant layer has easy peel properties, the container can be easily disassembled. The sealant layer 7 is formed from a resin composition in which a polyethylene resin 8, a polypropylene resin 9, and a thermoplastic elastomer 10 are blended.

  FIG. 7 is a cross-sectional view showing an example of an easy peeled state. The state where the sealant layer 7 is coherently broken is shown. The sealant layer 7 is formed from a resin composition in which a polyethylene resin 8, a propylene resin 9, and a thermoplastic elastomer 10 are blended. The polyethylene resin 8 has a strong sealing strength, the propylene resin 9 has an easy peel property, and the thermoplastic elastomer 10 has a function of exhibiting a stable easy peel property without causing stringing at the time of peeling.

  The liquid paper container of the present invention can be easily peeled off and dismantled from the top seal portion by hand without using stagnation or the like to disassemble a used empty container. The plug can also be removed from the seal. The scrapped paper container is flattened and used as recycling waste.

  The present invention will be described in more detail.

The laminate uses paperboard as a base material layer. For the base material layer, a basis weight of 200 to 500 g / m ² and a density of 0.6 to 1.1 g / cm ³ are used. A polyethylene resin can be extruded and laminated on the surface of the base material layer by an extruder. An appropriate printing layer (pattern ink layer) may be formed on the surface of the heat-meltable resin.

  As the intermediate layer having gas barrier properties, a polyethylene terephthalate film having an aluminum vapor deposition layer, a silicon oxide vapor deposition layer, and a magnesium oxide vapor deposition layer can be used. The intermediate layer can simultaneously improve the rigidity of the paper container. The thickness of the vapor deposition layer can be 5 to 100 nm, and the thickness of the polyethylene phthalate film can be 6 to 25 μm.

  The base material layer and the intermediate layer can be bonded together by sand poly processing via a heat-fusible resin. As the heat-fusible resin, low density polyethylene, medium density polyethylene, high density polyethylene, linear polyethylene, ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, ionomer, polypropylene, etc. can be used. . The thickness is preferably 10 to 60 μm. Moreover, in order to improve adhesive strength, you may perform a corona treatment, ozone treatment, anchor coat application | coating, etc. to the surface of a base material layer. Moreover, either side may be sufficient as the bonding surface of an intermediate | middle layer.

The sealant layer is formed by forming a resin composition containing a polyethylene resin, a propylene resin, and a thermoplastic elastomer with an extruder. The polyethylene resin may be a low-density polyethylene resin or a linear polyethylene resin. The linear polyethylene resin preferably has a density of 0.925 g / cm ³ or less and a melt index (JIS K 7210) of 4 or more.

Examples of thermoplastic elastomers include, for example, modified ethylene / α-olefin copolymers, polyolefin-based thermoplastic elastomers such as polybutene-1, polymethyl-1pentene, polyhexene 1 and polyoctene 1, styrene / isobrene copolymers, Polystyrene thermoplastic elastomers such as styrene / isobrene copolymers and hydrogenated products thereof, polyester thermoplastic elastomers, polyurethane thermoplastic elastomers, polyamide thermoplastic elastomers, chlorinated polymer thermoplastic elastomers, fluorine thermoplastic elastomers Etc. can be used. From the resin composition as the sealant layer, modified ethylene / α-olefin copolymer and polybutene-1 are preferable from the viewpoint of film forming property, seal strength, and easy peel property.

  The thickness of the sealant layer is preferably 30 to 100 μm. The sealant layer can be formed by an extrusion method using an extruder (T-die method) or an inflation method. The sealant layer can also be formed by single-layer or two-type two-layer coextrusion.

The intermediate layer and the sealant layer can be bonded together by, for example, a dry lamination method using a urethane two-component reactive adhesive. The adhesive is preferably applied in an amount of 0.5 to 5.0 g / cm ² . What is necessary is just to confirm and determine adhesive strength suitably. Moreover, it can bond together by a sand poly process through a polyethylene resin. The thickness of the polyethylene resin is preferably 15 μm or more.

  Hereinafter, specific examples of the present invention will be described.

On the surface of a paperboard having a basis weight of 350 g / m ² , 30 μm of polyethylene was extruded and bonded to form prototype 1. Next, a polyethylene terephthalate film deposited with aluminum oxide was used as an intermediate layer having gas barrier properties. The thickness of the aluminum oxide vapor deposition layer was 30 nm. The polyethylene terephthalate film used was 12μ. Next, in order to form a sealant layer, a polyethylene resin, a polypropylene resin and an ethylene / propylene copolymer resin are blended, and a blending ratio, polyethylene resin 60% by weight, polypropylene resin 10% by weight, ethylene / propylene copolymer resin 30 A resin composition having a weight% was prepared, and a two-layer / two-layer film was formed by a co-extrusion machine using the polyethylene resin and the resin composition. A laminated film having a total thickness of 60 μm and a polyethylene resin layer of 42 μm and a resin composition layer of 18 μm was formed. Next, the film surface of the aluminum oxide-deposited polyethylene terephthalate film and the polyethylene film surface of the laminated film were bonded together by a dry laminating method through a urethane two-component reactive adhesive to form prototype 2. Next, the back surface of the paperboard of the trial production 1 and the aluminum oxide vapor deposition surface of the trial production 2 were bonded together by sand poly processing through a polyethylene resin. A laminate having a sealant layer on the inner surface side (wetted side) was prepared.

  Next, in order to form a 900 ml liquid paper container using the laminate, a blank as shown in FIG. 1 is prepared, and then the outside of the back seal panel and the inside of the back panel are heat-sealed to form a sleeve. After assembly, the bottom was molded, the cap was attached, and the top seal plate was sealed, and a cap was attached to obtain a liquid paper container.

  Next, in order to form a sealant layer, the blending ratio of polyethylene resin, polypropylene resin, and ethylene / propylene copolymer resin is 40% by weight of polyethylene resin, 10% by weight of polypropylene resin, and 50% by weight of ethylene / propylene copolymer resin. A resin composition was prepared, and a two-kind two-layer coextrusion laminated film was formed using the polyethylene resin and the resin composition. Other than that was carried out in the same manner as in Example 1.

  Next, in order to form a sealant layer, the blending ratio of polyethylene resin, polypropylene resin, and ethylene / propylene copolymer resin is 80% by weight of polyethylene resin, 10% by weight of polypropylene resin, and 10% by weight of ethylene / propylene copolymer resin. A resin composition was prepared, and a two-kind two-layer coextrusion laminated film was formed using the polyethylene resin and the resin composition. Other than that was carried out in the same manner as in Example 1.

  Next, in order to form a sealant layer, a polyethylene resin, a polypropylene resin, and an ethylene / butene copolymer resin are blended, and a blending ratio, polyethylene resin 60% by weight, polypropylene resin 10% by weight, ethylene / butene copolymer resin 30. The same procedure as in Example 1 was performed except that a resin composition having a weight% was prepared and a laminated film having a total thickness of 60 μm was formed with a thickness of the polyethylene resin layer of the sealant layer of 42 μm and a thickness of the resin composition layer of 18 μm. .

  Next, in order to form a sealant layer, a resin composition comprising a blending ratio of polyethylene resin, polypropylene resin, and butene 1 resin, 60% by weight of polyethylene resin, 10% by weight of polypropylene resin, and 30% by weight of 1 resin of butene is prepared. This was carried out in the same manner as in Example 1 except that a laminated film having a total thickness of 60 μm and a thickness of 42 μm and a resin composition layer of 18 μm was formed.

  Next, a laminated film having a total thickness of 30 μm was formed, with the thickness of the polyethylene resin layer of the sealant layer being 15 μm and the thickness of the resin composition layer being 15 μm. Next, it carried out similarly to Example 1 except having bonded together the film surface of the said aluminum oxide vapor deposition polyethylene terephthalate film, and the polyethylene film surface of the said laminated | multilayer film by the sand poly process through 30 micrometers of polyethylene resin.

<Comparative Example 1>
Next, in order to form a sealant layer, the blending ratio of polyethylene resin, polypropylene resin and ethylene / propylene copolymer resin is 30% by weight of polyethylene resin, 10% by weight of polypropylene resin, and 60% by weight of ethylene / propylene copolymer resin. A resin composition was prepared, and a two-kind two-layer coextrusion laminated film was formed using the polyethylene resin and the resin composition. Other than that was carried out in the same manner as in Example 1.

<Comparative example 2>
Next, in order to form a sealant layer, the blending ratio of polyethylene resin, polypropylene resin and ethylene / propylene copolymer resin is 85% by weight of polyethylene resin, 10% by weight of polypropylene resin, and 5% by weight of ethylene / propylene copolymer resin. A resin composition was prepared, and a two-kind two-layer coextrusion laminated film was formed using the polyethylene resin and the resin composition. Other than that was carried out in the same manner as in Example 1.

<Comparative Example 3>
The sealant layer was formed in the same manner as in Example 1 except that a polyethylene resin layer of 60 μm was formed.

  The prepared liquid paper container was evaluated by the following method.

<Opening strength>
The top seal portion of the paper container is opened to the left and right as shown in FIG. 4, and the opposing top seal portion is inserted and fixed into the upper and lower fixing portions of the tensile tester, and the pulling speed is 300 mm / min.
Opening strength was measured in the test range / unit 0 to 100 {N}. If the opening strength is 30 N, it can be opened manually.

<Confirmation of peeling surface>
The peeled surface after the evaluation of the opening strength was confirmed, and ○ was used for cohesive peeling of the sealant layer, and × was used for paper removal.

<Sensory evaluation>
The top seal portion of the paper container was opened to the left and right as shown in FIG. 4, the opposed top seal pieces were gripped by hand, pulled outward, opened, and whether or not it was easy to open was evaluated by sensory evaluation. A circle indicates that 20 adult men can easily open the package.

<Drop test>
The liquid paper containers created in Examples 1 to 6 and Comparative Examples 1 to 3 were filled with 900 ml of cold water and dropped from the height of 80 cm toward the concrete surface five times to confirm the presence or absence of broken bags. . A circle indicates that the bag was not broken.

  Table 1 shows the evaluation results of Examples and Comparative Examples.

評価結果から、シーラント層を形成する樹脂組成物に対して、熱可塑性エラストマーの配合比率が１０〜５０重量％であれば、実用的なシール強度が確保でき、また安定したイージーピール性が発現できる。使用済み空容器を、鋏みを使用せずに手で容易に解体できる。イージーピールが可能である。また紙容器の強度や耐久性にも十分実用性があることが判った。

From the evaluation results, when the blending ratio of the thermoplastic elastomer is 10 to 50% by weight with respect to the resin composition forming the sealant layer, practical seal strength can be secured and stable easy peel property can be expressed. . Used empty containers can be easily dismantled by hand without using itch. Easy peel is possible. It was also found that the strength and durability of the paper container are sufficiently practical.

  The liquid paper container of the present invention can easily disassemble a used empty container. It can be easily disassembled by hand without using itching. The dismantled paper container becomes flat and can be separated for recycling to contribute to the promotion of recycling. It can be used in liquid paper containers for storing liquid contents such as sake, wine, shochu, plum wine and other alcoholic beverages, fruit juice drinks, sauces and other seasonings, and kitchen detergent.

1: Laminate 2: Surface layer (polyethylene layer)
3: Base material layer (paperboard)
4: Polyethylene layer 5: Intermediate layer (gas barrier layer)
6: Adhesive layer 7: Sealant layer 8: Polyethylene layer 9: Polypropylene layer 10: Thermoplastic elastomer 20: Blank of liquid paper container (surface)
30: Plug opening 40: Plug 41: Cap 50: Liquid paper container (with plug)
110: Back seal panel 120: Left panel 130: Front panel 140: Right panel 150: Back panel 160: Bending line A: Top seal B: Top C: Side wall D: Bottom E: Top seal plate a: Opening direction b : Opening direction c: opening direction d: opening direction

Claims (5)

  A laminate in which a paperboard is used as a base layer and a surface layer having a heat-bonding property / a base layer / an intermediate layer having a gas barrier property / a sealant layer is sequentially laminated, and the sealant layer is a layer made of a polyethylene resin , A resin composition comprising a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer, a layer having a sea-island structure is provided, and the blending ratio of the thermoplastic elastomer is relative to the resin composition A laminate for a liquid paper container, characterized by being 10 to 50% by weight.   The sealant layer is composed of a polyethylene resin layer and a resin composition in which a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer are blended, and a layer in which a sea-island structure is formed is laminated without using an adhesive. The laminate for a liquid paper container according to claim 1.   The laminate for a liquid paper container according to claim 1 or 2, wherein the thermoplastic elastomer is an ethylene / α-olefin copolymer or a polybutene-1 resin.   It consists of a laminate in which a paperboard is used as a base layer, and a surface layer having a heat-fusible property / a base layer / an intermediate layer having a gas barrier property / a sealant layer, and the sealant layer is an inner surface, In the gable roof type liquid paper container, the sealant layer is formed of a layer made of polyethylene resin and a resin composition in which polyethylene resin, polypropylene resin, and thermoplastic elastomer are blended, and a layer in which a sea island structure is formed is formed. A liquid paper container provided, wherein a blending ratio of the thermoplastic elastomer is 10 to 50% by weight with respect to the resin composition.   The sealant layer is composed of a polyethylene resin layer and a resin composition in which a polyethylene resin, a polypropylene resin, and a thermoplastic elastomer are blended, and a layer in which a sea-island structure is formed is laminated without using an adhesive. The liquid paper container according to claim 4.

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