JP2010013161A - Liquid paper container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid paper container capable of being easily disposed of, and allowing the effective reuse of resources (particularly, paper layer) by permitting easy manual separation between an outer surface mainly composed of paper and an inner surface mainly composed of the other plastic film. <P>SOLUTION: The liquid paper container is composed of a laminate formed by laminating a thermoplastic resin layer, a paper layer, an adhesive resin layer, a peel-off layer, a gas barrier layer, and a thermoplastic resin layer sequentially from the outer surface. The peel-off layer is composed of a first peel-off layer positioned in the gas barrier layer-side, a third peel-off layer positioned in the adhesive resin layer side, and a second peel-off layer provided between the first peel-off layer and the third peel-off layer. The liquid paper container can be separated by the peel-off layer into the outer surface containing at least the thermoplastic resin layer, the paper layer, and the adhesive resin layer and the inner surface containing at least the gas barrier layer and the thermoplastic resin layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention makes it easy to dispose of a laminate constituting a paper container with a release layer so that it can be easily separated into an outer surface portion mainly made of paper and an inner surface portion mainly made of plastic, and the resources are recycled. The present invention relates to a liquid paper container that is easy to use.

  Recently, environmental protection has been screamed, and the reuse of packaging materials has become a hot topic. Recycling activities have been promoted for paper containers for milk packaging made of polyethylene / paper / polyethylene laminates, as well as for paper-belt type paper containers. Has been carried out and has been effectively used by reusing resources.

  However, the paper-belt type paper container used for packaging of alcohol, wine, coffee, etc. is a paper container with excellent gas barrier properties for reasons such as protection of contents, distribution means, and prolonged distribution period. A laminate in which a gas barrier layer is laminated on the content side of the paper layer, for example, a laminate comprising a polyethylene layer / paper layer / adhesive resin layer / aluminum foil / adhesive layer / polyethylene terephthalate layer / polyethylene layer Is commonly used.

  However, although the paper container comprising the laminate having the above-described structure can obtain a stable gas barrier property, the paper layer and the gas barrier layer are firmly bonded to each other, and the paper layer and the gas barrier layer can be easily bonded. In other words, the paper layer cannot be peeled off and cannot be reused as paper recycling.

  Therefore, as a solution to this type of problem, a water-soluble resin layer is provided between the paper layer and the gas barrier layer, and the water-soluble resin layer is dissolved to separate the main part of the paper and the other parts. Proposed a liquid paper container (see, for example, Patent Documents 1 and 2), and an alkali-soluble resin layer is provided between the paper layer and the gas barrier layer. There has been proposed a liquid paper container which is separated into a main part and other parts (see, for example, Patent Document 3).

The techniques of Patent Documents 1 to 3 are peeled off using a peeling means such as “water”, “warm water”, or “alkaline aqueous solution”. Although it is valuable as a technology to separate it into parts of the paper, it is easy to separate the main part of the paper and other parts without using “water”, “warm water”, or “alkaline aqueous solution” peeling means. The present invention has been completed by finding that a liquid paper container that can be easily separated and received by general consumers can be obtained.
Japanese Patent Laid-Open No. 10-218170 Japanese Patent Laid-Open No. 10-291279 Japanese Patent Laid-Open No. 10-071662

  The present invention provides a paper-based portion that is easily handled with fingers or the like, that is, an outer surface portion including at least a thermoplastic resin layer, a paper layer, and an adhesive resin layer, and other portions, that is, a gas barrier layer and a thermoplastic resin layer. It is possible to provide a liquid paper container that can be separated into an inner surface portion of a plastic main body that contains at least, and that can be easily disposed of and can effectively reuse resources (particularly, a paper layer). .

  In order to achieve the above object, the inventor of the present invention described in claim 1 includes a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, a gas barrier layer, and a thermoplastic resin layer in order from the outer surface. A liquid paper container comprising a laminated body, wherein the release layer is a first release layer located on the gas barrier layer side, a third release layer located on the adhesive resin layer side, and the first release layer. And an outer surface portion including at least the thermoplastic resin layer, the paper layer, and the adhesive resin layer in the release layer, and a third release layer provided between the layer and the second release layer. The gas barrier layer and the thermoplastic resin layer are configured to be separable into an inner surface portion that includes at least the gas barrier layer and the thermoplastic resin layer.

  According to a second aspect of the present invention, in the liquid paper container according to the first aspect, the release interface of the release layer is between the first release layer and the second release layer. It is.

  According to a third aspect of the present invention, in the liquid paper container according to the first aspect, the release interface of the release layer is between the second release layer and the third release layer. It is.

  According to a fourth aspect of the present invention, in the liquid paper container according to the second aspect, the first release layer is made of any one of polyamide, shellac, and butyral, and the third release layer is urethane, butyral, ethylene- The second release layer is made of any one of vinyl acetate copolymer, cellulose acetate, nitrocellulose, ethylene-vinyl acetate copolymer, vinyl acetal, acrylic, vinyl chloride-vinyl acetate copolymer, The first release layer, the second release layer, and the third release layer are formed of different resins, respectively.

  According to a fifth aspect of the present invention, in the liquid paper container according to the third aspect, the first release layer is made of any one of polyamide, shellac, butyral, and urethane, and the third release layer is ethylene-vinyl acetate. It is made of a copolymer, and the second release layer is made of any one of nitrocellulose, acrylic, urethane, butyral, polyamide, shellac, cellulose acetate, and polyester, and the first release layer, the second release layer, and the third release layer. Each of the release layers is formed of a different resin.

  The present invention according to claim 6 is the liquid paper container according to any one of claims 1 to 5, wherein the gas barrier layer is a laminate of an aluminum foil and a biaxially stretched plastic film, a metal or a metal oxide. It is the biaxially stretched plastic film which vapor-deposited this.

  According to a seventh aspect of the present invention, in the liquid paper container according to any one of the first to sixth aspects, the shape includes a front plate, a rear plate, both side plates, a top forming plate, and a bottom forming plate. It is a bevel top type, and an adhesive strength adjusting layer is partially formed in a region where the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded to each other. By configuring in this way, the thermal bonding part between the outer surfaces of the top part and the bottom part becomes easy to peel off, so that it can be easily folded and peeled easily between the layers of the laminate with the peeling layer, Separating into an outer surface portion, that is, an outer surface portion including at least a thermoplastic resin layer, a paper layer, and an adhesive resin layer, and another portion, that is, an inner surface portion including at least a gas barrier layer and a thermoplastic resin layer. Can do.

  Further, the present invention according to claim 8 is the liquid paper container according to claim 7, wherein each of the top side forming plate and the bottom side forming plate connected to the upper and lower sides of the both side surface plates and the both side surface plates has a vertical direction. It has a configuration in which a folding line is formed. By comprising in this way, it becomes easy to fold and fold a both-side surface board inside.

  A liquid paper container comprising a laminate in which a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, a gas barrier layer, and a thermoplastic resin layer are laminated in order from the outer surface, wherein the release layer is the gas barrier layer A first release layer located on the side, a third release layer located on the adhesive resin layer side, and a second release layer provided between the first release layer and the third release layer. The release layer is separated into a paper-based outer surface portion including at least the thermoplastic resin layer, the paper layer, and the adhesive resin layer, and an inner surface portion including at least the gas barrier layer and the thermoplastic resin layer. Since it is a liquid paper container that can be configured, the paper container is disassembled after use, the end or corner of the paper container is bent, loosened, and the outer surface part mainly composed of paper in the release layer; Other than the plastic inner surface It is possible to to separate, in which excellent effects that the recycling of waste or resources spent paper containers becomes easy.

  In addition, the release layer has a three-layer configuration including the first release layer, the second release layer, and the third release layer, and by specifying the resin that forms each layer, the release interface is changed between the first release layer and the second release layer. It can be determined as either the interface of the release layer or the interface of the second release layer and the third release layer, and the laminate strength of the release interface is among the interlayer laminate strengths of the laminate constituting the liquid paper container The weakest strength can be obtained, and an excellent effect is obtained in that it can be easily peeled at the determined peeling interface.

The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a diagram schematically showing a layer structure of a laminate used in a liquid paper container according to the present invention, FIG. 2 is a plan view showing a surface state of a blank plate of a gobeltop paper container, and FIG. FIG. 4 is a partial perspective view showing a procedure for peeling and disassembling the adhesive portion of the outer surfaces of the bottom forming plate of the gobbel top type paper container, and FIG. 5 is a folded state of the gobber top type paper container. FIG. 6 is a perspective view showing a state in which an outer surface portion including at least a polyethylene layer, a paper layer, and an adhesive resin layer starts to be peeled off from an end portion of the gobeltop paper container, and FIG. FIG. 8 is a perspective view showing a state in which the outer surface portion including at least the adhesive resin layer is peeled over the entire length of the gobeltop paper container, and FIG. It is a perspective view which shows the method of making a hook, in the figure, 1 and 6 are polyethylene layers, 2 is a paper layer, 3 is an adhesive resin layer, 4 is a release layer, 4a is a first release layer, 4b is a second release layer 4c is a third release layer, 5 is a gas barrier layer, 7 and 8 are adhesion strength adjusting layers, 11, 12, 13, and 14 are side plates, 11a, 12a, 13a, and 14a are top forming plates, 11b, 12b, 13b and 14b are bottom forming plates, 15 is an adhesive plate, 16 and 17 are folding lines, 18 is a spout attachment hole, 19 is an edge bonding portion at the bottom, P is a gable top liquid paper container, and S is a laminate. Shown respectively.

  FIG. 1 is a diagram schematically showing a layer structure of a laminate used for a liquid paper container according to the present invention. A laminate S used for a liquid paper container P is composed of a polyethylene layer 1, a paper layer 2 and an adhesive resin in order from the outer surface. It is composed of a layer 3, a release layer 4, a gas barrier layer 5, and a polyethylene layer 6, and the release layer 4 is further positioned on the gas barrier layer 5 side and on the adhesive resin layer 3 side. The third release layer 4c, and the second release layer 4b provided between the first release layer 4a and the third release layer 4c, are all formed of a solid surface. The The printed pattern is usually provided on the outer surface of the polyethylene layer 1, but may be provided on the surface of the paper layer 2 on the polyethylene layer 1 side as necessary.

  The release layer 4 composed of three layers of the first release layer 4a, the second release layer 4b, and the third release layer 4c has a release interface between the first release layer 4a and the second release layer 4b. Or between the second release layer 4b and the third release layer 4c can be selected as appropriate, and the end face of the laminate S is bent or loosened with fingers or the like, The peeling interface is peeled between the first peeling layer 4a and the second peeling layer 4b, or between the second peeling layer 4b and the third peeling layer 4c, and the polyethylene layer 1 and the paper layer 2 are peeled off. Can be easily peeled and separated into a paper-based outer surface portion composed of the adhesive resin layer 3 and a plastic-based inner surface portion composed of the gas barrier layer 5 and the polyethylene layer 6.

  The release interface described above can be determined by appropriately selecting a resin that forms the first release layer 4a, the second release layer 4b, and the third release layer 4c. Initially, the case where it peels between the said 1st peeling layer 4a and the said 2nd peeling layer 4b is demonstrated. In this case, as the resin for forming the first release layer 4a, a biaxial layer in which a metal such as an aluminum foil surface or aluminum constituting the gas barrier layer 5 or a metal oxide such as aluminum oxide or silicon oxide is vapor-deposited is used. Polyamide, shellac, or butyral resin having good adhesion to the vapor-deposited surface of the stretched plastic film can be used, and the resin for forming the third release layer 4c is the adhesive resin. Any resin of urethane, butyral, and ethylene-vinyl acetate copolymer with good adhesion to the layer 3 (strong adhesive strength) can be used, and as the resin that forms the second release layer 4b, Adhesiveness with the third release layer 4c is better than the first release layer 4a (adhesive strength is strong), and the gas barrier layer 3 and the first release layer 4a Between the first release layer 4a and the second release layer 4b than the adhesive strength between the adhesive resin layer 3 and the third release layer 4c, or the adhesive strength between other interfaces and layers. A resin composed of weak adhesive strength is suitable, and any of cellulose acetate, nitrocellulose (nitrified cotton), ethylene-vinyl acetate copolymer, vinyl acetal, acrylic, vinyl chloride-vinyl acetate copolymer Resin can be used, and the first release layer 4a, the second release layer 4b, and the third release layer 4c are formed of different resins. The stability of the release interface (must be released from the same release interface) It is preferable from the meaning that

  Next, the case where it peels between the said 2nd peeling layer 4b and the said 3rd peeling layer 4c is demonstrated. In this case, as the resin for forming the first release layer 4a, a biaxial layer in which a metal such as an aluminum foil surface or aluminum constituting the gas barrier layer 5 or a metal oxide such as aluminum oxide or silicon oxide is vapor-deposited is used. Any resin of polyamide, shellac, butyral, urethane with good adhesion to the vapor deposition surface of the stretched plastic film (strong adhesive strength) can be used, and as the resin forming the third release layer 4c, Any resin of urethane, butyral, or ethylene-vinyl acetate copolymer that has good adhesiveness with the adhesive resin layer 3 (strong adhesive strength) can be used, but the resin that forms the second release layer 4b and the third resin It is necessary to peel between the release layer 4c, and the adhesive strength between them is the adhesive strength between the first release layer 4a and the second release layer 4b or the previous The adhesive strength between the gas barrier layer 3 and the first release layer 4a, the adhesive strength between the adhesive resin layer 3 and the third release layer 4c, or the adhesive strength between other interfaces or layers must be configured to be weaker. In consideration of this, in order to broaden the choice of resin for forming the second release layer 4b, ethylene-vinyl acetate copolymer is the most preferable resin, and the second release layer 4b is formed. As the resin, any one of nitrocellulose (nitrified cotton), acrylic, urethane, butyral, polyamide, shellac, cellulose acetate, and polyester can be used, and the first release layer 4a, the second release layer 4b, and the first release layer can be used. 3 The separation layer 4c is formed of a different resin from the stability of the separation interface (meaning that it can be peeled from the same separation interface). Those Masui.

  Moreover, the formation method of the said peeling layer 4 (1st peeling layer 4a, 2nd peeling layer 4b, 3rd peeling layer 4c) is a metal, such as the aluminum foil surface which comprises the gas barrier layer 5, or aluminum, or aluminum oxide For example, the first release layer 4a, the second release layer 4b, and the third release layer 4c are overprinted in order on the deposition surface of the biaxially stretched plastic film on which a metal oxide such as silicon oxide is deposited (for example, by gravure printing) Each layer is printed once and printed three times). In addition, microcrystalline wax, silicone, or the like may be added to each of the first release layer 4a, the second release layer 4b, and the third release layer 4c in order to obtain a desired release strength (adhesion strength). is there.

As the polyethylene layer 1, low density polyethylene is used, and as the polyethylene layer 6, low density polyethylene, medium density polyethylene, linear low density polyethylene, ethylene-α olefin copolymer polymerized using a single site catalyst, and the like are used. Can be used. As the paper layer 2, a paperboard (thick paper) having a basis weight of 250 to 450 g / m ² is used. As the adhesive resin layer 3, low density polyethylene, ionomer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene-acrylic An ethyl acid copolymer (EEA), an ethylene-methyl methacrylate copolymer (EMMA), or the like is used. As the gas barrier layer 5, a laminate of an aluminum foil having a thickness of 6 to 9 μm and a biaxially stretched polyethylene terephthalate film or a biaxially stretched nylon film, a metal such as aluminum, or a metal oxide such as aluminum oxide or silicon oxide is used. A vapor-deposited biaxially stretched polyethylene terephthalate film or a biaxially stretched nylon film is used.

  The liquid paper container of the present invention is arbitrary, such as a gobel top type or a flat top type (brick type). Hereinafter, a description will be given of a gobel top type liquid paper container. As shown in FIG. 2, the blank plate for producing the gobeltop type container has side plates 11, 12, 13, 14 and an adhesive plate 15 connected to each other via a crease, and side plates 11, 12, Top and bottom forming plates 11a, 12a, 13a, and 14a and bottom forming plates 11b, 12b, 13b, and 14b are connected to the upper and lower edges of the plates 13 and 14 through creases, respectively. Fold line 16 in the longitudinal direction, and fold line 17 in the longitudinal direction is formed at the center of the top forming plates 12a and 14a and the bottom forming plates 12b and 14b, respectively, and the side plates 11, 12, 13, and 14 are formed at the top. The plates 11a, 12a, 13a, 14a or the bottom forming plates 11b, 12b, 13b, 14b are formed in a state excluding predetermined dimensions above and below the creases connecting the plates. Then, partial adhesion strength adjustment is performed for the region where the surfaces of the bottom forming plates 11b, 12b, 13b, 14b are thermally bonded and the region where the surfaces of the top forming plates 11a, 12a, 13a, 14a are thermally bonded. A layer 7 and an adhesive strength adjusting layer 8 are formed. The printed pattern layer is formed in a region excluding the region to be thermally bonded on the surface of the blank plate.

  Adhesive strength adjusting layers 7 and 8 are ethylene-vinyl acetate copolymer, chlorinated ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorinated polypropylene, cyclized rubber, polyamide resin, urethane resin, acrylic resin. It can be formed by printing using a resin ink made of a simple substance of cellulose resin, alkyd resin or a mixture thereof. The area for forming the adhesive strength adjusting layers 7 and 8 is an area of 20% or more of the area where the surfaces of the bottom forming plates 11b, 12b, 13b and 14b and the top forming plates 11a, 12a, 13a and 14a are thermally bonded to each other. It is good to do.

  After the side plate 11 and the adhesive plate 15 are thermally bonded to the blank plate shown in FIG. 2 and formed into a cylindrical shape, the bottom forming plates 11b, 12b, 13b, and 14b are bent and thermally bonded to form the bottom. Then, the top forming plates 11a, 12a, 13a, and 14a are bent and thermally bonded to form the top, thereby obtaining a Gobel top type paper container as shown in FIG. When discarding the paperbell type paper container, the top forming plates 12a and 14a provided with the adhesive strength adjusting layer 8 are peeled off from the surface where the surfaces are thermally bonded, and the bottom provided with the adhesive strength adjusting layer 7 is provided. After the portions where the surfaces of the forming plates 12b, 13b, and 14b are thermally bonded to each other are peeled off, and the top and bottom portions of the gobeltop paper container are disassembled, the side plates 12 and 14 are folded at the folding line 16 at the center in the width direction. 5 and by folding the top forming plates 12a, 14a and the bottom forming plates 12b, 14b inward at the folding line 17 at the center in the width direction, respectively, as shown in FIG. it can.

  As shown in FIG. 4, the procedure for dismantling the bottom part of the paper-belt type paper container by peeling the part where the surfaces of the bottom part forming plates 12b, 13b, 14b provided with the adhesive strength adjusting layer 7 are thermally bonded to each other is shown in FIG. From the state shown in FIG. 4 (a), the edge adhering portion 19 at the bottom is peeled off from the bottom forming plate 13b and raised to the state shown in FIG. 4 (b). Further, the portions where the surfaces of the bottom portion forming plates 12b and 14b (see FIG. 2) are thermally bonded are peeled to separate the edge thermal bonding portion 19 into the state shown in FIG. Next, the side plates 12 and 14 are folded inward at the folding line 16 in the central portion in the width direction to obtain the state shown in FIG. 4 (d), and the top forming plates 12a and 14a are folded in the central portion in the width direction. By folding inward along the curved line 17, the gobeltop paper container can be brought into the folded state shown in FIG.

  In the folded state of the gobeltop paper container shown in FIG. 5, the side plate bonded to the rear plate 11, the top forming plate 11 a, and the bonding plate 15 of the bottom forming plate 11 b, that is, the end of the laminate S is exposed. By bending or loosening the corners or corners of the corners, it can be peeled off at the desired peeling interface constituting the peeling layer 4 of the laminate S. Therefore, as shown in FIG. The outer surface portion including at least the polyethylene layer 1, the paper layer 2, and the adhesive resin layer 3 can be peeled off from the corners of the forming plate 11a and the bottom forming plate 11b, and as shown in FIG. It can be made to peel over the full length of the side edge part of the top part formation board 11a and the bottom part formation board 11b. Moreover, as shown in FIG. 8, after peeling off the adhesion part of the outer surfaces of the top thermal bonding part, the polyethylene layer is obtained by pulling the thermal bonding part of the inner surfaces and breaking and opening the inner bonding part from the bonding end part. 6 is formed by separating the outer surface portion including at least the paper layer 1, the paper layer 2, and the adhesive resin layer 3 from the other inner surface portion, and peeling the outer surface portion at the top from the other inner surface portion. As shown, the outer surface portion including at least the polyethylene layer 1, the paper layer 2, and the adhesive resin layer 3 can be peeled off from the other inner surface portions from the corners of the top forming plate 11a. The separated outer surface portion and inner surface portion (inner surface portion mainly composed of plastic including at least the gas barrier layer 5 and the polyethylene layer 6) can be treated separately, so that disposal or reuse becomes easy.

  Next, the present invention will be described in more detail with reference to the following examples.

  A low-density polyethylene film (hereinafter referred to as 60 μm thick) with a urethane adhesive on the other surface of a 12 μm-thick biaxially stretched polyethylene terephthalate film (hereinafter referred to as PET) having an aluminum deposited layer on one surface. A laminated film having a laminated structure (referred to as LDPE) was produced. Next, resin inks A, B, and C having composition 1 shown in Table 1 are used on the aluminum vapor deposition layer surface of the laminated film, and the first release layer is formed with resin ink A using a gravure plate having a depth of 30 μm. The intermediate release body in which the second release layer was formed with resin ink B and the third release layer with resin ink C was solid-printed in this order to form a release layer having a three-layer structure.

Separately, an LDPE having a thickness of 30 μm was laminated on one side of a 400 g / m ² paperboard by extrusion coating, and the other side of the paperboard and the release layer surface of the intermediate laminate were combined with an ethylene-methacrylic acid copolymer (hereinafter referred to as “the PEPE”). EMAA) is laminated by extrusion lamination at a thickness of 25 μm, whereby LDPE 30 μm / paperboard 400 g / m ² / EMAA 25 μm / third release layer (resin ink C) / second release layer (resin ink B) / second The final laminate 1 consisting of 1 release layer (resin ink A) / aluminum vapor deposition layer / PET 12 μm / urethane adhesive / LDPE 60 μm was prepared.

  A final laminate 2 was prepared in the same manner as in Example 1 except that the resin inks A, B, and C having the composition 2 were used instead of the resin inks A, B, and C having the composition 1 shown in Table 1.

  A final laminate 3 was produced in the same manner as in Example 1 except that the resin inks A, B, and C having the composition 3 were used instead of the resin inks A, B, and C having the composition 1 shown in Table 1.

  A final laminate 4 was prepared in the same manner as in Example 1 except that the resin inks A, B, and C having the composition 4 were used instead of the resin inks A, B, and C having the composition 1 shown in Table 1.

The release layers of the final laminates 1 and 2 thus obtained were integrated with the laminates in both layers and had an adhesive force as a gobeltop paper container. Further, by bending or loosening the ends or corners of the final laminates 1 and 2 with fingers, at the interface between the first release layer and the second release layer, LDPE 30 μm / paperboard 400 g / m ² / EMAA 25 μm It was possible to easily separate into an outer surface portion made of aluminum and an inner surface portion made of aluminum vapor deposition layer / PET 12 μm / urethane adhesive / LDPE 60 μm.

A blank board for a paperbelt-type paper container is formed by punching after forming a printed pattern on the 30 μm-thick LDPE surface of the final laminates 1 and 2 produced above and printing an adhesive strength adjusting layer in a predetermined region. The blank plate was attached to a cylinder, and the top part and the bottom part were formed by thermal bonding to produce a gobber top type paper container. The first peelable layer and the first peelable layer are separated from each other by peeling the adhesive portions between the outer surfaces of the top and bottom portions of the gobeltop paper container so that the paper container is folded and folding the end of the corner of the folded paper container. 2 It peels at the interface with the release layer and can be easily separated into an outer surface portion made of LDPE 30 μm / paperboard 400 g / m ² / EMAA 25 μm and an inner surface portion made of aluminum vapor deposition layer / PET 12 μm / urethane adhesive / LDPE 60 μm. did it.

Moreover, the peeling layers of the obtained final laminates 3 and 4 were integrated with the laminates in any of the layers, and had an adhesive force as a gobeltop paper container. Further, by bending or loosening the ends or corners of the final laminates 3 and 4 with fingers, LDPE 30 μm / paperboard 400 g / m ² / EMAA 25 μm at the interface between the second release layer and the third release layer. It was possible to easily separate into an outer surface portion made of aluminum and an inner surface portion made of aluminum vapor deposition layer / PET 12 μm / urethane adhesive / LDPE 60 μm.

A blank board for a gobeltop paper container is formed by punching after a printed pattern is formed on the 30 μm-thick LDPE surface of the final laminates 3 and 4 produced above and an adhesive strength adjusting layer is formed in a predetermined region by printing. The blank plate was attached to a cylinder, and the top part and the bottom part were formed by thermal bonding to produce a gobber top type paper container. By peeling the adhesive portions between the outer surfaces of the top and bottom portions of the gobeltop type paper container to make the paper container folded, and folding the end of the corner of the folded paper container, 3 Peel off at the interface with the release layer and easily separate into an outer surface portion consisting of LDPE 30 μm / paperboard 400 g / m ² / EMAA 25 μm and an inner surface portion consisting of aluminum vapor deposition layer / PET 12 μm / urethane adhesive / LDPE 60 μm. did it.

It is a figure which shows the layer structure of the laminated body used for the liquid paper container concerning this invention schematically. It is a top view which shows the state of the surface of the blank board of a gobeltop type paper container. It is a perspective view which shows one Example of a gobeltop type | mold paper container. It is a fragmentary perspective view which shows the procedure which peels and decomposes | disassembles the adhesion part of the outer surfaces of the bottom part formation board of a gobeltop type paper container. It is a perspective view which shows the state which the govel top type paper container folded. It is a perspective view which shows the state which begins to peel the outer surface part containing at least a polyethylene layer, a paper layer, and an adhesive resin layer from the edge part of a gobeltop-type paper container. It is a perspective view which shows the state which peeled the outer surface part which contains at least a polyethylene layer, a paper layer, and an adhesive resin layer over the full length of a gobeltop-type paper container. It is a perspective view which shows the method of making the opportunity which peels the outer surface part and inner surface part of a gobeltop type paper container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,6 Polyethylene layer 2 Paper layer 3 Adhesive resin layer 4 Peeling layer 4a 1st peeling layer 4b 2nd peeling layer 4c 3rd peeling layer 5 Gas barrier layer 7, 8 Adhesive strength adjustment layer 11, 12, 13, 14 Side plate 11a, 12a, 13a, 14a Top forming plate 11b, 12b, 13b, 14b Bottom forming plate 15 Adhesive plate 16, 17 Folding curve 18 Outlet attachment hole 19 Edge adhering portion P Gebel top type liquid paper container S Laminate

Claims (8)

A liquid paper container comprising a laminate in which a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, a gas barrier layer, and a thermoplastic resin layer are laminated in order from the outer surface, wherein the release layer is the gas barrier layer From three layers of a first release layer located on the side, a third release layer located on the adhesive resin layer side, and a second release layer provided between the first release layer and the third release layer The separation layer is separable into an outer surface portion including at least the thermoplastic resin layer, the paper layer, and the adhesive resin layer, and an inner surface portion including at least the gas barrier layer and the thermoplastic resin layer. A liquid paper container characterized by comprising. The liquid paper container according to claim 1, wherein a release interface of the release layer is between the first release layer and the second release layer. The liquid paper container according to claim 1, wherein a release interface of the release layer is between the second release layer and the third release layer. The first release layer is made of any one of polyamide, shellac, and butyral, the third release layer is made of any of urethane, butyral, and ethylene-vinyl acetate copolymer, and the second release layer is made of cellulose acetate, nitro It consists of any of cellulose, ethylene-vinyl acetate copolymer, vinyl acetal, acrylic, vinyl chloride-vinyl acetate copolymer, and the first release layer, the second release layer, and the third release layer are different. 3. The liquid paper container according to claim 2, wherein the liquid paper container is made of resin. The first release layer is made of polyamide, shellac, butyral, or urethane, the third release layer is made of an ethylene-vinyl acetate copolymer, and the second release layer is nitrocellulose, acrylic, urethane, butyral, The said 1st peeling layer, the said 2nd peeling layer, and the said 3rd peeling layer are formed from different resin, respectively, which consists of polyamide, shellac, cellulose acetate, or polyester. Liquid paper container. 6. The liquid according to claim 1, wherein the gas barrier layer is a laminate of an aluminum foil and a biaxially stretched plastic film, or a biaxially stretched plastic film on which a metal or a metal oxide is deposited. Paper container. The shape of the liquid paper container according to any one of claims 1 to 6 is a Gobel top type comprising a front plate, a rear plate, both side plates, a top forming plate, and a bottom forming plate, and the top forming plate and the top plate A liquid paper container, wherein an adhesive strength adjusting layer is partially formed in a region where outer surfaces of bottom forming plates are thermally bonded to each other. 8. The liquid paper container according to claim 7, wherein vertical folding lines are respectively formed in the center portions of the top portion forming plate and the bottom portion forming plate connected to the upper and lower sides of the both side surface plates and the both side surface plates. Liquid paper container.

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