JP2000185729A - Paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make start of peeling of a laminated body easy by infiltrating an inter-paper reinforcing agent consisting of an isocyanate or the like in a paper layer of a side end corner section of a top section forming sheet to be affixed to a bonding piece. SOLUTION: A corner section of the side end of a top section forming sheet 11a is made an inter-paper reinforcing section 7 by infiltrating an inter-paper reinforcing agent in paper layers which constitute a laminated body. By a blank sheet of this constitution, when a gable top type paper container is formed, by bending the inter-paper reinforcing section 7 which is infiltrated with the inter-paper reinforcing agent at the corner section of the side end of the top section forming sheet 11a, the paper layers at the bent section are not peeled between layers. For this reason, a shear force by the bending is applied to the bonded surfaces of the laminated body, and the laminated body is peeled on an interfacial surface wherein the bonding strength is weakest. Therefore, a start to separate the laminated body to an external surface layer and an internal surface layer, can be easily made. Thus, the disassembling of the gable top type paper container by peeling the bonded sections of the top section and the bottom section, is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid paper container manufactured by using a laminate constituted so that an outer layer mainly composed of paper and an inner layer mainly composed of plastic can be separated. The present invention relates to a liquid paper container having an excellent gas barrier property, which facilitates creation of a trigger for separating and separating the paper.

[0002]

2. Description of the Related Art Recently, recycling of packaging materials has become a topic of concern for environmental protection, and it has been used in packaging of milk or the like made of a polyethylene / paper / polyethylene laminate even in a gobel-top type paper container. Paper containers
Recycling activities are being carried out and resources are being reused for effective use. On the other hand, in the case of a goebel top type paper container used for packaging of alcohol, wine, coffee, etc., a paper container having excellent gas barrier properties is used for protection of contents, distribution means, and extension of distribution period. Necessary, polyethylene / paper / ethylene-acrylic acid copolymer / aluminum foil / adhesive / biaxially stretched polyethylene terephthalate /
A laminate made of polyethylene is generally used. Also, recently, a laminate having a configuration in which the layer composed of aluminum foil / adhesive / biaxially oriented polyethylene terephthalate in the above-described configuration is a biaxially oriented polyethylene terephthalate having an aluminum vapor-deposited layer has been used. However, in a paper container made of a laminate having the above-described structure, it is necessary to separate the outer layer mainly composed of paper and the inner layer mainly composed of plastic because the adhesive strength between the layers of the laminate is strong. It is extremely difficult, and it is difficult to reuse a used paper container. Further, since the paper container is extremely rigid, it is difficult to fold and discard the paper container.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure for separating a laminate for producing a liquid paper container into an outer layer mainly composed of paper and an inner layer mainly composed of plastic, By making it easy to make a trigger for peeling the laminate, the laminate can be easily separated into an outer surface layer and an inner surface layer.Used paper containers can be reused and have excellent gas barrier properties that can be easily disposed of. It is to provide a liquid paper container.

[0004]

Means for Solving the Problems A laminate constituted so as to be separable into an outer layer mainly composed of paper and an inner layer mainly composed of plastic, comprising a front plate, a rear plate, both side plates, an adhesive piece and In a gobel-top type liquid paper container having a top forming plate and a bottom forming plate, a configuration in which a paper layer at a side end corner of a top forming plate bonded to an adhesive piece is impregnated with an inter-sheet reinforcement such as isocyanate or the like. Since the liquid paper container is of the type described above, the laminate is easily peeled off at the space between the paper layers by bending the edge of the container in which the paper space reinforcing agent is impregnated and the paper space is strengthened. Therefore, the laminate can be easily separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic, triggered by the peeled portion. Therefore, the outer layer mainly composed of paper can be reused, and the inner layer mainly composed of plastic has a reduced bulk and can be easily disposed.

In the above liquid paper container, the upper end of the adhesive piece and the upper end of the top forming plate connected to the adhesive piece via a crease are penetrated through the paper layers of the laminate extending obliquely upward from the crease, respectively. By forming a half cut from the outer surface to be formed, the corner at the upper end of the Goebel top type container impregnated with the inter-sheet strengthening agent becomes easy to be bent, so that the trigger for peeling to separate the laminate is triggered. Easy to make.

[0006] In the above liquid paper container, the laminated body is composed of 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, or a thermoplastic resin layer in order from the outer surface. By having a structure including a layer, a paper layer, a release layer, an adhesive resin layer, a gas barrier layer, and a thermoplastic resin layer, a thermoplastic resin layer, a paper layer, an adhesive resin layer or a thermoplastic resin layer and a paper are formed in a release layer. It can be separated into an outer layer composed of layers and a gas barrier layer and a thermoplastic resin layer or an inner layer composed of an adhesive resin layer, a gas barrier layer and a thermoplastic resin layer, so that the outer layer mainly composed of paper can be easily reused. Becomes

In the above-mentioned liquid paper container, the gas barrier layer is a laminate of aluminum foil and a plastic film or a metal or metal oxide-deposited plastic film, so that a gas suitable for packaging alcohol, wine, coffee, etc. A liquid paper container having excellent barrier properties can be obtained.

The above-mentioned liquid paper container is a gobel top type having a front plate, a rear plate, both side plates, a top forming plate and a bottom forming plate, and the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded. By forming the adhesive strength adjusting layer partially in the region to be heat-bonded, the heat-bonded portions between the outer surfaces of the top and bottom are easily peeled off, the top and bottom are disassembled, and the laminate is bonded from the edge. It is easy to separate the resin layer from the release layer to separate into an outer layer mainly composed of paper and an inner layer mainly composed of plastic.

In the above-described liquid paper container, the both side plates are formed by forming vertical folding curves at the center portions of the top forming plate and the bottom forming plate connected vertically above and below the both side plates. It is easy to fold inside and fold.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a blank plate for producing a liquid paper container according to the first embodiment of the present invention,
FIG. 2 is a plan view showing an upper half portion of a blank plate for producing a liquid paper container according to a second embodiment of the present invention, and FIG. 3 is a blank for producing a liquid paper container according to the second embodiment of the present invention. FIG. 4 is a plan view showing another shape of the plate, FIG. 4 is a plan view showing an upper half portion of a blank plate for producing a liquid paper container according to the third embodiment of the present invention, and FIGS. FIG. 7 is a cross-sectional view showing a configuration of a laminate used for a paper container. FIG. 7 is a partial perspective view showing a procedure of peeling and disassembling adhesive portions between outer surfaces of a bottom forming plate of a gobel top type container. FIG. 9 is a perspective view showing a folded state of the container, FIG. 9 is a perspective view showing a state in which the laminate is separated from an end of the container into an outer layer and an inner layer, and FIG. 10 is a state in which the outer layer is separated over the entire length of the container. 1 and 6 are polyethylene layers, 2 is a paper layer, and 3 is an adhesive resin. , The peeling layer 4, the gas barrier layer 5, 7 is the sheet interval reinforced portion, 8a, 8b, 8c are half cut, 9a,
9b is an adhesive strength adjusting layer, 11 is a rear plate, 12 is a front plate, 12, 14
Is a side plate, 11a, 12a, 13a, 14a are top forming plates, 11b, 12
b, 13b and 14b denote bottom forming plates, 15 denotes an adhesive piece, 16 and 17 denote fold curves, and 18 denotes a bottom edge bonded portion.

As shown in FIG. 1, a blank plate for manufacturing a gobel-top type liquid paper container according to the first embodiment of the present invention includes a rear plate 11, a side plate 12, a front plate 13, and a side plate 14.
And the adhesive strip 15 are connected to each other via a crease, and the rear plate 11
Top forming plates 11a, 12a, 13a, and 14a are connected to the upper edges of the side plates 12, the front plate 13, and the side plates 14 via creases, respectively, and the bottom forming plates 11b, 12b, 13b and 14b are connected to each other via a crease, and the corners at the side ends of the top forming plate 11a are formed into the inter-sheet reinforcing portion 7 by impregnating the inter-sheet reinforcing agent into the paper layer forming the laminate. ing. In addition, a fold curve 16 is formed in the center of the side plate 12 and the side plate 14 in the longitudinal direction, and a fold curve 17 is formed in the center of the top forming plates 12a, 14a and the bottom forming plates 12b, 14b, respectively. Side plates 11, 12, 1
3, 14 and the top forming plates 11a, 12a, 13a, 14a or the bottom forming plates 11b, 12b, 13b, 14b are formed in a state excluding a predetermined upper and lower dimension of a crease connecting the top forming plates 11a, 12b, 13b, 14b. 12a, 13a,
A partial adhesive strength adjusting layer 9a is provided in the area where the surfaces 14a are thermally bonded, and a partial adhesive strength adjusting layer is provided in the area where the surfaces of the bottom forming plates 11b, 12b, 13b and 14b are thermally bonded. 9b are respectively formed. The printed pattern layer is formed except for the area of the surface of the blank plate which is thermally bonded.

When the blank shown in FIG. 1 is used to form a gobel top type paper container, the gap between the corners at the side edges of the top forming plate 11a is impregnated with the gap between the papers. By folding, the paper layer in the bent portion does not peel between the layers, so that the shearing force due to bending is applied to the bonding surface of the laminate and the laminate peels off at the interface where the adhesive strength is the weakest. The trigger for separation for separating the outer layer into the outer layer and the inner layer can be easily formed.
In a region where the surfaces of the top forming plates 11a, 12a, 13a, and 14a are thermally bonded, a partial adhesive strength adjusting layer 9a is bonded, and the surfaces of the bottom forming plates 11b, 12b, 13b, and 14b are thermally bonded. Since the partial adhesive strength adjusting layer 9b is formed in each of the regions, the top and bottom adhesive portions of the Goebel top type paper container are easily peeled off and disassembled, and the top and bottom are disassembled. The paper container can be folded along the folding curves 16 and 17.

A blank plate for manufacturing a gobel-top type liquid paper container according to the second embodiment of the present invention is basically the same as the blank plate according to the first embodiment. The difference is that a half cut is provided in the laminated body in order to make it easy to bend the corner at the upper end when molded. As shown in FIG. 2, the upper half of the blank plate is bonded to the adhesive strip 15 and the upper end of the top forming plate 14a.
In this configuration, oblique half cuts 8a and half cuts 8b extending upward from the crease are formed with the crease formed between the crest and the top forming plate 14a. The half cuts 8a and 8b are formed so as to penetrate the paper layer from the outer surface of the laminate. In the case of the second embodiment, the corner portion is formed as the sheet gap reinforcing portion 7 and the half cut is performed.
Since 8a and 8b are formed and are easy to bend, there is an effect that the trigger for peeling can be formed very easily after the adhesive portion between the inner surfaces of the tops of the goebel top type paper container is peeled and disassembled.

Further, the gobel-top type liquid paper container according to the second embodiment of the present invention can be manufactured by using a blank plate shown in FIG. The blank plate shown in FIG.
Adhesive pieces 15, side plates 12, front plate 13, and side plates with protruding tops
14 and the rear panel 11 are connected via folds, respectively,
Top forming plates 12a, 13a, 14a, and 11a are connected to the upper edges of the front plate 12, the front plate 13, the side plates 14, and the rear plate 11 via folds, respectively, and the bottom forming plates 12b, 13b are formed at the lower edges. , 14b, 11b are connected to each other via a crease, and the top forming plate 11a
The corners at the side edges of are formed as inter-sheet reinforcing portions 7 by impregnating the inter-layer reinforcing agent into the paper layer constituting the laminate, and the adhesive strips
The oblique half-cut 8a and the half-cut 8b are formed on the upper end of the top 15 and the top forming plate 12a with the crease between the adhesive piece 15 and the top forming plate 12a sandwiched therebetween and extending upward from the crease. The liquid paper container manufactured by using the blank plate shown in FIG.
And half cuts 8a, 8b are formed and it is easy to bend, so after peeling off the adhesive part of the inner surface of the top of the govel top type paper container and dismantling,
There is an effect that the trigger for peeling can be formed very easily.

A blank plate for manufacturing a gobel-top type liquid paper container according to a third embodiment of the present invention has an upper half portion as shown in FIG. 3, and a top portion of the blank plate according to the second embodiment is formed. A half cut 8c is further provided at a position facing the half cut 8b at the upper end of the plate 14a. In the case of the third embodiment, the corner where the top adhesive plate 15 and the top forming plate 11a are bonded to the top of the govel top type paper container manufactured using the blank plate shown in FIG. Since the corners at the ends are the inter-sheet reinforcing portions 7 and the half cuts 8a, 8b, 8c are provided, the folding is easy, and the laminated body can be formed without disassembling the top of the gobel top type paper container. A trigger can be made to separate the outer layer and the inner layer by peeling. Also in the third embodiment, after disassembling the top part of the goebel top type paper container, corners can be bent to form a trigger for peeling, similarly to the second embodiment.

The laminate used to manufacture the liquid paper container of the present invention can have the structure shown in FIG. 5 or FIG. The structure shown in FIG. 5 includes, in order from the outer surface, a polyethylene layer 1, a paper layer 2, an adhesive resin layer 3, a release layer 4, a plastic film layer 5, a gas barrier layer 6, and a polyethylene layer 7.
6 is a configuration in which the polyethylene layer 1, the paper layer 2, the release layer 4, the adhesive resin layer 3, the plastic film layer 5, the gas barrier layer 6, and the polyethylene layer 7 are sequentially arranged from the outer surface. Are laminated, and as the gas barrier layer 6, a laminate of an aluminum foil and a plastic film or a metal or metal oxide vapor-deposited plastic film is used. In either configuration, the laminate can be separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic at the interface of the release layer 4. The configuration of the laminate is not limited to the above configuration, and may be any configuration as long as it can be separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic.

The polyethylene layer 1 is made of low-density polyethylene, and the polyethylene layer 6 is made of low-density polyethylene, medium-low-density polyethylene, linear low-density polyethylene, or ethylene-polymerized using a single-site catalyst.
α-olefin copolymer or the like is used. As the paper layer 2, a paperboard 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 acid Ethyl copolymer (EEA) and ethylene-methyl methacrylate copolymer (EMMA) can be used, but it is most preferable to use low-density polyethylene in terms of cost and workability. As the gas barrier layer 5, a laminate of an aluminum foil and a plastic film or an aluminum-deposited plastic film is used. As the plastic film, a biaxially oriented polyethylene terephthalate, a biaxially oriented nylon, a biaxially oriented polypropylene or the like is used.
An axially stretched film is used.

The following resins can be used as the release layer 4. When the release layer is formed on the gas barrier layer surface as in the configuration shown in FIG. 5, it will be formed on the aluminum foil surface, metal or metal oxide vapor deposition layer surface, or plastic film surface constituting the gas barrier layer. Resins that can be used when the release layer is formed on the aluminum surface or the vapor deposition layer surface include shellac, polyamide resin, ethylene-vinyl acetate copolymer, acrylic resin, cellulose, and the like, and the release layer is formed on the plastic film surface. Examples of resins that can be used in this case include polyester resins, ethylene-vinyl acetate copolymers, and acrylic resins. When the release layer is formed on the paper layer surface as in the configuration shown in FIG. 6, a resin such as polyvinyl alcohol, polyvinyl pyrrolidone, butyral, and shellac can be used. By using the above resin as the release layer 4, the adhesive strength at the interface of the release layer is 10 to 100.
g / 15 mm width, which can provide practically no problem strength when used as a liquid paper container such as a goebel top type, and a laminate mainly composed of paper at the interface of the release layer. The outer layer and the inner layer mainly composed of plastic can be separated by separation.

The adhesive strength adjusting layers 9a and 9b are made of ethylene-vinyl acetate copolymer, chlorinated ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorinated polypropylene, cyclized rubber, polyamide resin, urethane-based resin. It can be formed by printing using a resin ink consisting of a resin, an acrylic resin, a cellulose resin, an alkyd resin alone or a mixture thereof. The area where the adhesive strength adjusting layers 9a and 9b are formed is the bottom forming plates 11b, 12b, 13b,
It is preferable that the surface area of the surface 14b and the surface of the top forming plates 11a, 12a, 13a, 14a be at least 20% of the area to be thermally bonded.

In the method of disassembling the goebel top type paper container, the portions of the top forming plates 12a and 14a provided with the adhesive strength adjusting layer 9a are thermally bonded to each other, and the adhesive strength adjusting layer 9b is provided. The surface of the bottom forming plates 12b, 13b, 14b is peeled off from the heat-bonded part, and the top and bottom of the Goebel top type container are disassembled, and then both side plates 12, 14 are bent at the center in the width direction. By folding inward at 16 and folding the top forming plates 12a, 14a and the bottom forming plates 12b, 14b inward at the folding curve 17 at the center in the width direction, respectively, as shown in FIG. Can be.

Bottom forming plate 12 provided with adhesive strength adjustment 9b
The procedure of disassembling the bottom of the Goebel top type container by peeling off the parts where the surfaces of b, 13b, and 14b are thermally bonded, as shown in FIG. 7, starts from the state shown in FIG. The edge bonding portion 18 is peeled off from the bottom forming plate 13b and raised, as shown in FIG.
State. Further, the portions of the bottom forming plates 12b and 14b where the surfaces are thermally bonded are peeled off from each other to separate the edge bonding portions 18, and the state shown in FIG. 7C is obtained. Next, the side plates 12,1
4 is bent inward at the fold curve 16 at the center in the width direction, and the top forming plates 12a and 14a are bent at the fold curve 17 at the center in the width direction.
By folding inward at, the goebel top type container can be brought into the folded state shown in FIG.

In the folded state of the paper container shown in FIG. 8, the paper gap reinforcement impregnated with the paper gap reinforcement at the corners adhered to the adhesive piece 15 of the top forming plate 11a connected to the upper end of the rear plate 11. Part 7
By folding the layer, as shown in FIG. 9, it is possible to make a trigger for separating the laminate at the interface of the release layer 4 and separating the laminate into the outer layer and the inner layer. Next, as shown in FIG. 10, the top forming plate 11a, the rear face plate 11, and the bottom forming plate 11a.
b, the laminate is peeled at the interface of the peeling layer 4 over the entire length of the side end portion, whereby an outer surface layer composed of the polyethylene layer 1, the paper layer 2, and the adhesive resin layer 3, the plastic film layer 5, and the gas barrier layer 6 And an inner layer composed of a polyethylene layer 7.

As another method of dismantling the goebel top type paper container, in the state of the goebel top type paper container, the paper space reinforcing agent is impregnated to form the paper space reinforcing portion 7 and the half cuts 8a, 8b, 8c are formed. By bending the corners of the top portions that have been made easier to bend, it is possible to make a trigger for separating the laminate at the interface of the release layer 4 at the bent corners and separating the laminate into the outer layer and the inner layer. By holding the peeled trigger portion and proceeding with the peeling, the laminate is made up of the polyethylene layer 1, the paper layer 2 and the adhesive resin layer 3.
And a plastic film layer 5, a gas barrier layer 6 and an polyethylene layer 7.

[0024]

EXAMPLE 1 A 12 μ biaxially stretched polyethylene terephthalate film and a 7 μ aluminum foil were laminated by dry lamination using a urethane adhesive, and a 60 μ polyethylene film was used on the aluminum foil surface using a urethane adhesive. Then, lamination was performed by dry lamination, and a release layer was formed to a thickness of 1 μm on the surface of the biaxially stretched polyethylene terephthalate film using an ink having the following composition to prepare a laminated film. [Composition of ink forming release layer (parts by weight)] Ethylene-vinyl acetate copolymer Evaflex 220 (Mitsui DuPont Polychemical) 10 Toluene (solvent) 90 Next, 30 μ polyethylene is applied to one surface of 400 g of paperboard. Laminated by extrusion, the other side of the paperboard and the release layer side of the laminated film prepared above were laminated by extrusion lamination of polyethylene having a thickness of 25 μm, polyethylene 30μ / paperboard 400g / polyethylene 25μ /
Release layer / biaxially oriented polyethylene terephthalate 12μ /
A laminate composed of urethane-based adhesive / aluminum foil 7 μ / urethane-based adhesive / polyethylene film 60 μ was prepared.

A printed pattern is formed on the 30 μm polyethylene surface of the obtained laminate, and an adhesive strength adjusting layer is formed on a predetermined area by printing, and then punched out to form a gable-top type container having the shape shown in FIG. After making the blank board, apply a cotton cloth soaked with a paper-to-paper reinforcing agent to the corners of the top forming board that is attached to the adhesive piece when attaching the blank board to the blank board in a state where the blank boards are stacked After impregnating the paper layer with the paper interval reinforcing agent by applying
It was left for 1 hour in an atmosphere of 0 ° C. and 80% RH to cure the inter-sheet strengthening agent composed of isocyanate. [Composition of the paper-to-paper reinforcing agent (parts by weight)] Isocyanate (Coronate L) 5 Ethyl acetate (solvent) 95 After attaching the blank plate prepared as described above in a cylinder, the bottom and top are thermally bonded to each other to make a gauber top paper. A container was made. By peeling off the adhesive part between the surfaces at the top and bottom of the obtained göbel top type paper container and disassembling it, folding the container, and bending the end portion which has been impregnated with the inter-paper reinforcing agent and which has been made the inter-paper reinforcing portion, At the bent corners, the laminate can be peeled off and separated, and the laminate can be separated from the trigger by polyethylene / paperboard /
An outer layer mainly composed of paper made of polyethylene and an inner layer mainly composed of plastic composed of biaxially stretched polyethylene terephthalate / urethane-based adhesive / aluminum foil / urethane-based adhesive / polyethylene film can be separated and separated. Was.

[0026]

According to the present invention, there is provided a laminate which can be separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic, and has a front plate, a rear plate, both side plates, an adhesive piece, a top forming plate, A liquid liquid container of a goebel top type having a bottom forming plate, wherein a paper layer at a side end corner of a top forming plate bonded to an adhesive piece is impregnated with an inter-sheet reinforcing agent made of isocyanate or the like. Since it is a paper container, the laminate is easily peeled off at the release layer surface by trying to bend the edge of the container whose paper gap is reinforced by impregnation with the paper gap reinforcing agent. Thus, the laminate can be easily separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic. Therefore, the outer layer mainly composed of paper can be reused, and the inner layer mainly composed of plastic becomes less bulky and is discarded. In the above-mentioned liquid paper container, the upper end of the adhesive piece and the upper end of the top forming plate connected to the adhesive piece via the crease are formed from the outer surface penetrating the paper layer of the laminate extending obliquely upward from the crease. By forming the half-cut, the corner of the upper end of the gobel-top type container impregnated with the inter-sheet reinforcing agent is easily bent, so that it is easy to make a trigger for peeling for separating the laminate. . In the above-described liquid paper container, the laminate is formed of 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, or a thermoplastic resin layer and paper in order from the outer surface. By having a configuration consisting of a layer, a release layer, an adhesive resin layer, a gas barrier layer, and a thermoplastic resin layer,
An outer layer composed of a thermoplastic resin layer and a paper layer and an adhesive resin layer or a thermoplastic resin layer and a paper layer in a release layer, a gas barrier layer and a thermoplastic resin layer or an adhesive resin layer, a gas barrier layer, and a thermoplastic resin layer. Since it can be separated into the inner layer made of, it is easy to reuse the outer layer mainly composed of paper. In the above liquid paper container, by forming the gas barrier layer from a laminate of aluminum foil and a plastic film or a metal or metal oxide vapor-deposited plastic film, the gas barrier layer suitable for packaging alcohol, wine, coffee, etc. An excellent liquid paper container can be obtained.
The liquid paper container has a shape of a goebel top including a front plate, a rear plate, both side plates, a top forming plate, and a bottom forming plate, and a region where the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded to each other. By forming the adhesive strength adjusting layer partially on the outer surface, the heat bonding portion between the outer surfaces of the top and the bottom is easily peeled off, the top and the bottom are disassembled, and the laminate is bonded to the adhesive resin layer from the edge. By peeling between the release layers, it becomes easy to separate into an outer layer mainly composed of paper and an inner layer mainly composed of plastic. In the above-mentioned liquid paper container, the both side plates are folded inward by forming a vertical folding curve at the center of the top forming plate and the bottom forming plate connected vertically above and below the both side plates. It becomes easy to fold.

[Brief description of the drawings]

FIG. 1 is a plan view showing a blank plate for producing a liquid paper container according to a first embodiment of the present invention.

FIG. 2 is a plan view showing an upper half of a blank plate for producing a liquid paper container according to a second embodiment of the present invention.

FIG. 3 is a plan view showing another shape of a blank plate for producing a liquid paper container according to a second embodiment of the present invention.

FIG. 4 is a plan view showing an upper half of a blank plate for producing a liquid paper container according to a third embodiment of the present invention.

FIG.

FIG. 6 is a sectional view showing a configuration of a laminate used for the liquid paper container of the present invention.

FIG. 7 is a partial perspective view showing a procedure for peeling and disassembling an adhesive portion between outer surfaces of a bottom forming plate of the goebel top type container.

FIG. 8 is a perspective view showing a folded state of the gobel top type container.

FIG. 9 is a perspective view showing a state in which the laminate is separated from an end portion of the container into an outer surface layer and an inner surface layer.

FIG. 10 is a perspective view showing a state in which the outer surface layer is peeled over the entire length of the container.

[Explanation of symbols]

1, 6 Polyethylene layer 11 Rear panel 2 Paper layer 13 Front panel 3 Adhesive resin layer 12, 14 Side panel 4 Release layer 11a, 12a, 13a, 1
4a Top forming plate 5 Gas barrier layer 11b, 12b, 13b, 1
4b Bottom forming plate 7 Reinforced section between sheets 15 Adhesive pieces 8a, 8b, 8c Half cut 16, 17 Fold curve 9a, 9b Adhesive strength adjustment layer 18 Bottom edge adhesive section

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E060 AA03 AA05 AB04 BC01 BC04 BC08 CE08 DA20 DA30 EA03 4F100 AA17D AB01D AB10D AB33D AK01B AK01D AK01E AK04 AK42 AK51G AK68 AR00C AR00D BA05 BA07 BA10BBAA DBA BAB CB EJ82A GB16 HB00 JB16B JB16E JD02D JL00 JL14 JL14C JL16

Claims (8)

[Claims] 1. A laminated body which can be separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic, comprising a front plate, a rear plate, both side plates, an adhesive piece, a top forming plate, In a govel top type liquid paper container having a bottom forming plate, a paper layer at a side end corner of the top forming plate bonded to the adhesive piece is impregnated with an inter-sheet reinforcing agent. And liquid paper container. 2. The liquid paper container according to claim 1, wherein the inter-sheet reinforcing agent is an isocyanate. 3. An upper end of the adhesive piece and an upper end of the top forming plate connected to the adhesive piece through a crease from an outer surface penetrating a paper layer extending obliquely upward from the crease. The liquid paper container according to claim 1, wherein the liquid paper container has a configuration in which a half cut is formed. 4. The laminate comprises, in order from the outer surface, a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, a gas barrier layer, and a thermoplastic resin layer, and is separated into an outer layer and an inner layer by the release layer. The liquid paper container according to any one of claims 1 to 3, wherein the liquid paper container is configured to be capable of being used. 5. The laminate comprises a thermoplastic resin layer, a paper layer, a release layer, an adhesive resin layer, a gas barrier layer, and a thermoplastic resin layer in order from the outer surface, and is separated into an outer surface layer and an inner surface layer by the release layer. The liquid paper container according to any one of claims 1 to 3, wherein the liquid paper container is configured to be capable of being used. 6. The liquid paper container according to claim 4, wherein the gas barrier layer is a laminate of an aluminum foil and a plastic film, or a metal or metal oxide-deposited plastic film. 7. The adhesive strength adjusting layer according to claim 1, wherein 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. The liquid paper container according to the above. 8. A vertical bent curve is formed at a central portion of each of the side plate and the top forming plate and the bottom forming plate connected vertically above and below the both side plates. The liquid paper container according to the above.