JP2000326957A - Paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable simple separation and disjoint at parts where external surfaces at the top and bottom parts of a used paper container are stuck together and to reuse the external surface layer by a method wherein adhesive strength adjusting layers are formed at areas where external surfaces of top- forming plates and bottom-forming plates are heat sealed together. SOLUTION: For a blank for forming a gable-topped paper container, side plates 1-4 and an adhesion plate 5 are connected with one another through creases, and top-forming plates 11-14 and bottom-forming plates 21-24 are connected respectively to the upper end edges and the lower end edges of the side plates 1-4 respectively through the creases. While the creases 6a are formed in the vertical direction respectively at the centers of the side plate 2 and the side plate 4, the creases 6b and 6c are formed also in the vertical direction respectively at the centers of the top-forming plates 12, 14 and the bottom- forming plates 22, 24. Then, adhesive strength adjusting layers 7a, 7b and 8a-8e are formed at areas where the surfaces of the top-forming plates 12, 14 and the bottom forming plates 22-24 are stuck with one another, and the adhesive strength at these areas are weakened, facilitating separation at the time of disjointing a paper container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling and discarding resources by disassembling a used container to make it easier to fold and separating a laminate constituting a paper container into an outer layer and an inner layer. The present invention relates to a liquid paper container that is easy to perform.

[0002]

2. Description of the Related Art Conventionally, as a liquid paper container having excellent gas barrier properties used for packaging of alcohol, wine, coffee, etc., for example, a printing layer / polyethylene layer /
A Goebel top paper container is generally used which has a laminated structure in which a paper layer / adhesive resin layer / aluminum foil layer / adhesive layer / polyethylene terephthalate layer / polyethylene layer is laminated. The Gebel-top type paper container made of the above-mentioned laminate has a state in which the laminate has rigidity, and the outer surfaces of the top forming plate and the bottom forming plate are completely thermally bonded by the polyethylene layer on the surface of the laminate. Therefore, it is extremely difficult to disassemble the top and bottom portions of the used paper container, and it is difficult to reduce the bulk by folding the paper container and it is difficult to dispose of the paper container. As a liquid paper container that can be easily disposed after use, there is known a paper container described in JP-A-10-218169, in which the top and bottom of the container are easily disassembled and folded. . However, the liquid paper container of this configuration has a drawback that the used container is simply folded to reduce the bulk to make it easier to discard, and does not allow the used container to be reused.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to easily disassemble the top and bottom of a paper container made of a laminate having high rigidity, and to make the laminate a paper-based outer layer and a plastic. It is an object of the present invention to provide a liquid paper container which can be separated into an inner surface layer mainly composed of an inner surface layer, an outer surface layer can be reused, and the inner surface layer is easily discarded.

[0004]

Means for Solving the Problems A rectangular cylindrical body is formed by laminating a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, an intermediate base material layer and a thermoplastic resin layer in this order from the outer surface. A paper container having a side plate forming a portion, a top forming plate, and a bottom forming plate, wherein an adhesive strength adjusting layer is 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 doing so, the top and bottom outer surfaces of the used paper container are easily peeled off and disassembled,
The laminate can be separated from the disassembled top or bottom at the interface of the release layer and separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic, so that the outer layer can be reused and the inner layer is bulky. And it becomes easier to dispose.

[0005] In the above liquid paper container, the adhesive strength adjusting layer is formed on substantially the entire surface of the region where the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded, so that the top forming plate and the bottom forming plate are formed. The bonding portion between the outer surfaces of the plate can be easily peeled off, and the top and bottom of the paper container can be easily disassembled.

In the above-mentioned liquid paper container, since the portion where the adhesive strength adjusting layer is not formed and the portion where the adhesive strength adjusting layer is not formed overlaps and is strongly bonded is formed, the portion where the adhesive strength adjusting layer is not formed is strongly bonded, so that sufficient practical use is achieved. A paper container having strength can be obtained.

In the above liquid paper container, the adhesive strength adjusting layer is not formed in the inner area of the adhesive strength adjusting layer in an area of 5 to 35% of the area where the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded. With the configuration in which the portions are formed, the outer surfaces of the top forming plate and the bottom forming plate are strongly bonded to each other at the portion where the adhesive strength adjusting layer is not formed, so that sufficient practical strength can be obtained when a paper container is used.

In the above liquid paper container, a pair of side plates facing each other and a top forming plate and a bottom forming plate connected to the pair of side plates are formed with bent curves, respectively. After the top and bottom of the paper container are disassembled, the side plates and the top forming plate and the bottom forming plate connected to the both side plates are easily bent, so that the container can be easily folded.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view illustrating a blank plate according to an embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating the configuration of a laminate according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a procedure for disassembling the top of the embodiment. 4 is a view showing a procedure for disassembling the bottom portion of the embodiment, FIG. 5 is a perspective view showing a method for creating a trigger for peeling the laminate of the embodiment, and FIG. 6 is a diagram of separating the laminate of the embodiment into an outer layer and an inner layer. FIG. 7 is a bottom view of the embodiment, wherein 1, 2, 3, and 4 are side plates, 5 is an adhesive plate, 11, 12, 13, and 14 are top forming plates, and 15 is a top adhesive. Part, 2
1, 22, 23, 24 are bottom forming plates, 25 is a bottom edge bonding portion, 6a, 6
b and 6c are bent curves, 7a and 7b are adhesive strength adjustment layers, 8a, 8b, 8c,
8d and 8e are adhesive strength adjusting layers, 9a, 9b, 9c, 9d, 9e, 9f, 9
g and 9h are portions where no adhesive strength adjusting layer is formed, 41 is a thermoplastic resin layer, 42 is a paperboard layer, 43 is an adhesive resin layer, 44 is a release layer, 45 is an intermediate substrate layer, 46 is a thermoplastic resin layer, 10a , 10b, 10g, and 10h represent the high pressure parts, respectively.

A blank plate according to an embodiment of the present invention is a blank plate for a gobel-top type paper container as shown in FIG. 1, in which side plates 1, 2, 3, and 4 and an adhesive plate 5 are arranged via a crease. Each is connected, and the top forming plate 1 is attached to the upper edge of the side plates 1, 2, 3, and 4.
1,12,13,14 are connected via creases
Bottom forming plates 21, 22, 23, 24 are respectively connected to the lower edges of 1, 2, 3, 4 via fold lines, and the center portions of the side plates 2 and 4 are respectively bent along the vertical direction. 6a is formed, and a folding curve 6b and a folding curve 6c are formed in the center of the top forming plates 12, 14 and the bottom forming plates 22, 24, respectively, in the vertical direction.
Adhesion strength adjusting layers 7a and 7
b are formed, and adhesive strength adjusting layers 8a, 8b, 8c, 8d, 8e are formed in regions where the surfaces of the bottom forming plates 22, 23, 24 are thermally bonded. The printed pattern is formed except for an area that is thermally bonded to the polyethylene layer on the surface of the blank plate.

The adhesive strength adjusting layers 7a and 7b are provided on top forming plates 12 and 14, respectively.
The bonding strength adjusting layers 8a, 8b, 8c, 8d, and 8e cover almost the entire surface of the region where the surfaces of the bottom forming plates 22, 23, and 24 are thermally bonded. The adhesive strength adjusting layer 8a has an adhesive strength adjusting layer non-forming portion 9a, 9b in the inner area, and the adhesive strength adjusting layer 8b has an adhesive strength adjusting layer non-forming portion 9c in the inner area. The adhesive strength adjusting layer non-formed portions 9d and 9e are provided in the inner area of the adjusting layer 8c, the adhesive strength adjusting layer non-formed portions 9f are provided in the inner area of the adhesive strength adjusting layer 8d, and the adhesive strength adjusting layer 8e is provided in the inner area thereof. Adhesion strength adjustment layer non-formed part
9g and 9h are formed respectively. When the top and bottom portions of the paper container are formed by thermal bonding by forming the non-bonding strength adjusting layer forming portion, the polyethylene layers on the surface of the laminate in the non-bonding strength adjusting layer forming portion become hot. Since the bonding is performed, a strong bonding strength is obtained in the portion where the bonding strength adjustment layer is not formed.

When the bottom of the paper container is formed by thermal bonding, as shown in FIG. 7, a high-pressure portion for pressing a portion of the press pad corresponding to the portion where the adhesive strength adjusting layer is not formed, with the height being increased by about 0.5 mm. By setting to 10a, 10b, 10g, 10h, the area of the area where the adhesive strength adjustment layer is not formed can be strongly pressurized, so that the adhesive strength of the polyethylene layer on the surface in the area where the adhesive strength adjustment layer is not formed can be increased. Thus, it is possible to prevent the adhesive portion between the outer surfaces of the bottom portion forming plate from peeling off. In FIG. 7, the high-pressure portion 10a is on the non-adhesion strength adjusting layer forming portion 9a,
The high pressure part 10g is applied to the adhesive strength adjustment layer non-formed part 9g and the high pressure part 10h.
Are respectively corresponding to the adhesive strength adjusting layer non-forming portions 9h.

In the first embodiment, one of the surfaces of the top forming plates 12, 14 is thermally bonded to one of the surfaces, and the other of the bottom forming plates 22, 23, 24 is thermally bonded to one of the surfaces. Has an adhesive strength adjustment layer formed on the surface,
An adhesive strength adjusting layer may be formed on both surfaces of the top forming plates 12, 14 and the bottom forming plates 22, 23, 24 to which the surfaces thereof are thermally bonded. By forming the adhesive strength adjusting layers on both surfaces, the top forming plates 12, 14 and the bottom forming plates 22, 23,
The heat bonding strength of the 24 surfaces can be further reduced. By forming an adhesive strength adjusting layer on both surfaces of the top forming plates 12, 14 and the bottom forming plates 22, 23, 24 where only the surface where the thermal bonding strength is particularly weakened is to be particularly weakened. Is also good. In the case where the adhesive strength adjusting layers are formed on both surfaces, it is necessary to form them so that the portions where the adhesive strength adjusting layers are not formed are located at opposing positions.

The adhesive strength adjusting layer is made of 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 composed of a simple substance of a cellulose resin, an alkyd resin or a mixture thereof, but it is most preferable to use an ink composed of an acrylic resin.

The laminate used in the embodiment of the present invention is:
As shown in FIG. 2, a polyethylene layer 41 which is a thermoplastic resin layer, a paperboard layer 42, an adhesive resin layer 43, a release layer 44, and an intermediate base material layer.
45 and a polyethylene layer 46 as a thermoplastic resin layer. With this configuration, the release layer 44
The laminate is peeled off at the interface of the outer layer mainly composed of paper consisting of the polyethylene layer 41, the paperboard layer 42 and the adhesive resin layer 43, and the plastic film mainly composed of the intermediate base layer 45 and the polyethylene layer 46. It can be separated into inner layers.

The resin that can be used as the release layer 44 includes
Depending on the intermediate base layer 45, for example, an aluminum-deposited plastic film, a plastic film laminated with aluminum foil is used as the intermediate base layer 45, and the polyethylene layer 41 / paperboard layer 42 / adhesive resin layer 43 / release layer 44 / Aluminum vapor deposition layer / plastic film layer / polyethylene layer 46 or polyethylene layer 41 / paperboard layer 42 / adhesive resin layer 43 / release layer 44 / aluminum foil layer /
In the case of a configuration consisting of a plastic film layer / polyethylene layer 46, by forming the release layer 44 with shellac, polyamide resin, polyester resin, acrylic resin, butyral resin, vinyl chloride-vinyl acetate copolymer resin, The laminate can be peeled between the adhesive resin layer 43 and the release layer 44, and by forming the release layer 44 with an ethylene-vinyl acetate copolymer, the laminate can be separated from the release layer 44 and the aluminum vapor-deposited layer or aluminum foil. It can be peeled off at the interface with the layer.

With the above-mentioned structure of the laminate, the adhesive strength between the adhesive resin layer 43 and the release layer 44 or the adhesive strength between the release layer 44 and the aluminum foil layer or the aluminum vapor deposition layer constituting the intermediate base material layer 45 can be reduced. Since the width can be set to 10 to 100 g / 15 mm, even when a liquid paper container such as a goebel top type is used, practically no problematic strength is obtained, and the laminate is peeled off at the interface of the peeling layer 44. Can be separated into an outer layer and an inner layer.

In order to disassemble the top and bottom of the gobel-top type liquid paper container manufactured by using the blank plate shown in FIG. 1, first, the top adhesive portion 15 on the top of the container shown in FIG. And open, as shown in FIG.
The side plate 4 and the side plate 2 are each bent inward at the fold line 6a, and the top forming plate 14 and the top forming plate 12 are each bent inward at the fold line 6b. Then, FIG.
The bottom edge bonding portion 25 of the container bottom portion shown in (a) is peeled off from the bottom surface and raised, and the state shown in FIG.
As shown in (c), the outer side adhesive portion of the bottom edge adhesive portion 25 is peeled off and opened, and the side plate 4 and the side plate 2 are bent inward at the fold line 6a, respectively, and the bottom forming plate is formed. 24 and the top forming plate 12 are each folded inward at the fold line 6c to be in a folded state. After disassembling and folding the top and bottom portions of the paper container, as shown in FIG. 5, the top bonding plate 15 from which the top bonding portion 15 has been peeled off is grasped and pulled diagonally outward to obtain the top bonding portion 15. In this case, the inner surfaces of the top forming plates 11, 12, 13, 14 can be peeled off to form openings.

The top forming plates 11, 12, 1 at the top bonding portion 15
By peeling the adhesion between the inner surfaces of the top and bottom forming plates 11, 12, 13, and 14, the laminate is peeled at the interface of the peeling layer 44 at the upper edge or the lower edge of the bonded portion between the inner surfaces of the top forming plates 11, 12, 13, and 14. come.
By grasping the peeled portion and peeling the outer layer of the laminate as shown in FIG. 6, the laminate can be separated into an outer layer and an inner layer. The outer layer mainly composed of paper consisting of the separated polyethylene layer 41, the paperboard layer 42 and the adhesive resin layer 43 can be reused, and the inner layer mainly composed of a plastic film composed of the intermediate base layer 45 and the polyethylene layer 46 can be used. It becomes smaller in volume and easier to discard. The release layer 44 is peeled off in a state of being attached to the inner surface layer or in a state of being attached to the outer surface layer, depending on the type of resin used.

The adhesive resin layer 43 in the laminate of the embodiment is made of low-density polyethylene, ionomer, ethylene-
Acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl methacrylate copolymer Although a polymer (EMMA) can be used, it is preferable to use low-density polyethylene in view of cost and workability.

The polyethylene layer 41 is made of low-density polyethylene, and the polyethylene layer 46 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 paperboard layer 42, a paper having a basis weight of 250 to 450 g / m ² is used. As the intermediate base layer 45, a plastic film or a plastic film having an aluminum foil, an aluminum vapor deposition layer, and a metal oxide vapor deposition layer is used. As the plastic film, a biaxially stretched film such as biaxially stretched polyethylene terephthalate, biaxially stretched nylon, or biaxially stretched polypropylene, which is excellent in vapor deposition workability and heat resistance, is used.

[0022]

According to the present invention, a laminated body in which a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, an intermediate base material layer, and a thermoplastic resin layer are laminated in this order from the outer surface forms a square tubular body. A paper container having a side plate, a top forming plate, and a bottom forming plate,
By using an adhesive strength adjustment layer formed in the area where the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded, the portion where the outer surfaces of the top and bottom of the used paper container are bonded can be simplified. The outer layer is reused because it can be separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic by separating the laminated body from the disassembled top or bottom at the interface of the release layer and separating it. And the inner layer becomes less bulky and easier to discard. In addition, an adhesive strength adjusting layer non-formed portion is formed in an inner region of the adhesive strength adjusting layer, and the area of the adhesive strength adjusting layer non-formed portion is set to 5 to 35 of the area to which the outer surfaces of the top forming plate and the bottom forming plate are bonded. %, The outer surfaces of the top forming plate and the bottom forming plate strongly adhere to each other in the portion where the adhesive strength adjusting layer is not formed, so that sufficient practical strength can be obtained even in the case of a paper container such as a gobel top type. Furthermore, when the bottom is formed by thermal bonding, the portion where the adhesive strength adjustment layer is not formed overlaps and the part to be bonded is strongly pressed, so that the portion where the adhesive strength adjustment layer is not formed is more strongly bonded. Strength is obtained. In the above-described liquid paper container, the top forming plate and the bottom forming plate connected to the both side plates and the both side plates are formed with bent curves, respectively. In addition, since the top forming plate and the bottom forming plate connected to the side plates are easily bent, the container can be easily folded.

[Brief description of the drawings]

FIG. 1 is a plan view showing a blank plate according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a laminate according to the embodiment of the present invention.

FIGS. 3A and 3B are views showing a procedure for disassembling a top part of the embodiment.

FIGS. 4A, 4B, and 4C are views showing a procedure for disassembling the bottom of the embodiment.

FIG. 5 is a perspective view showing a method for creating a trigger for peeling the laminate of the embodiment.

FIG. 6 is a perspective view showing a state in which an outer layer of the laminate of the embodiment is peeled off.

FIG. 7 is a bottom view of the embodiment.

[Explanation of symbols]

1, 2, 3, 4 Side plate 5 Adhesive plate 11, 12, 13, 14 Top forming plate 15 Top bonding portion 21, 22, 23, 24 Bottom forming plate 25 Bottom edge bonding portion 6a, 6b, 6c Folding curve 7a , 7b Adhesive strength adjusting layer 8a, 8b, 8c, 8d, 8e Adhesive strength adjusting layer 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h Adhesive strength adjusting layer non-formed part 41 Thermoplastic resin layer 42 Paperboard layer 43 Adhesive resin layer 44 Release layer 45 Intermediate base material layer 46 Thermoplastic resin layer 10a, 10b, 10g, 10h High pressure part

Claims (6)

[Claims] 1. A laminated body in which a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, an intermediate base material layer, and a thermoplastic resin layer are laminated in order from the outer surface to form a square tubular body. A paper container having a side plate, a top forming plate, and a bottom forming plate,
A liquid paper container, wherein an adhesive strength adjusting layer is formed in a region where the outer surfaces of the top forming plate are thermally bonded and a region where the outer surfaces of the bottom forming plate are thermally bonded. 2. The liquid according to claim 1, wherein the adhesive strength adjusting layer is formed on substantially the entire surface of the region where the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded. Paper container. 3. The liquid paper container according to claim 1, wherein a portion in which an adhesive strength adjusting layer is not formed is formed in an inner region of the adhesive strength adjusting layer. 4. The liquid paper container according to claim 3, wherein the portion where the adhesive strength adjusting layer non-formed portion overlaps and adheres is formed by pressure bonding. 5. The area of the portion where the adhesive strength adjusting layer is not formed is 5 to 35% of the area of the region where the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded to each other. 3. The liquid paper container according to 3. 6. A configuration in which a pair of opposed side plates of the side plate and a top forming plate and a bottom forming plate connected to the pair of side plates are formed with bent curves, respectively. Item 6. A liquid paper container according to any one of Items 1 to 5.