JP2009083900A - Paper vessel for liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper vessel for liquid capable of being volume-reduced by easily peeling (disassembling) a bottom part after use and being easily reused as resources. <P>SOLUTION: The paper vessel P1 for liquid has the bottom part comprising a bottom wall part 24, overhanging parts 10 connected to both side wall parts and stretching out in the sidelong direction of both the side wall parts respectively and each having an approximately triangle shape in a plan view, a mated-gluing wall part 6 made by mate-gluing one mated wall part and another mated wall part between the tip ends of the overhanging parts, and the first protrusive pieces 8 protrusively mounted on both ends of both overhanging parts of another mated wall part in the direction perpendicular to the lengthwise direction of another mated wall part 7, the bottom part being made by folding the mated-gluing wall part so that another mated wall part contacts the bottom wall part, folding both overhanging parts on the bottom wall part side and fixing both the overhanging parts to the mated-gluing wall part wherein the paper vessel for liquid is separably composed of an outer surface portion of paper as a major component and an inner surface side portion of a plastic as a major component. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid paper container for storing contents such as liquids and viscous substances such as coffee, juice, sake, shochu, whiskey, wine, shampoo, rinse, dressing, ketchup, mayonnaise, or various cleaning liquids, More specifically, when the liquid paper container is discarded after use, it can be easily folded and reduced in volume, and it is easily separated into a part mainly made of paper and a part mainly made of plastic. The present invention relates to a liquid paper container that can be disposed of easily, can be easily discarded, and can easily lead to reuse of resources.

  Examples of liquid paper containers include 1) a Gobeltop paper container with an inclined roof on the top, 2) a brick paper container having a hexahedral shape, or a hexagonal column shape, a top surface, and a bottom surface obtained by modifying the brick paper container. A columnar paper container having a quadrangular shape and an octagonal body shape, and a wedge-shaped paper container having a rectangular bottom surface and a top portion with a horizontal line seal are known.

  In each of the liquid paper containers described above, the constituent members constituting the bottom are folded and fixed by thermocompression bonding. In particular, the tips of the constituent members that are exposed at the bottom are firmly fixed in a state where they are in close contact with the bottom of the paper container. Therefore, when the volume of such a container is folded and reduced in volume, it is necessary to pull up the tip of the structural member firmly fixed in close contact with the bottom with a finger and peel it off to disassemble it. (Dismantling) There is a risk of damaging nails, etc., and in order not to cause the above problem, it is necessary to use a knife such as a pinch or a cutter knife, but the work of disassembling with a knife is quite annoying Therefore, there has been a demand for a liquid paper container that can easily be peeled (disassembled) with a finger and can be reduced in volume.

  As one technique for meeting this demand, the bottom surface of the liquid paper container is made concave by lifting the respective sides of the liquid paper container that are in contact with a pair of opposing side surfaces to the inner surface side of the liquid paper container, thereby making the bottom surface concave. There is a technique for holding the seal flap in a state along the bottom without being fixed to the bottom (see, for example, Patent Document 1).

  As another technique, the bottom horizontal line seal of the liquid paper container is provided with two cuts, the bottom seal flap is bent so as to contact the bottom of the two cuts, and the bottom seal flap is sandwiched between the cuts. Thus, there is a technique for holding the bottom seal flap in a state along the bottom without being fixed to the bottom (see, for example, Patent Document 2).

  However, in the above two techniques, the bottom surface seal flap is held along the bottom by using the repulsive force of the paper by forming a concave surface, or the bottom surface seal flap is held by sandwiching the bottom surface seal flap in the notch. It is a technology that keeps the bottom seal flap in a state that does not stick to the bottom, and in the case where an external force is applied to the liquid paper container in the distribution process etc. When the holding state is released, the bottom seal flap at the bottom is opened at the time of sale, which may give the purchaser not only a poor appearance of the product but also an image of the product being altered.

  Another requirement for liquid paper containers is that they can be reduced in volume and can be easily separated into parts mainly made of paper and parts made mainly of plastic. There has been a demand for a liquid paper container that can be reused.

  In this technology, a release layer is provided between a paper-based part and a plastic-based part, and the paper-based part and plastic-based part can be easily separated by this release layer. Separable (see, for example, Patent Document 3). Furthermore, Patent Document 3 has a structure in which the top and the bottom are sealed by thermal bonding, but the adhesive strength adjustment layer is partially provided in a region where the outer surfaces are thermally bonded to each other at the top and the bottom. It is configured so that the top and bottom can be easily disassembled, and the disassembly of the top is still provided with the adhesive strength adjustment layer described above, which is generally called the perfect bottom. A considerable amount of force is still required, and a liquid paper container that can be easily disassembled at the bottom has been desired as in the case of the cited documents 1 and 2.

The present inventor pays attention to the flat bottom of the brick-type paper container, and by providing a grip allowance for pulling up and peeling the constituent member with a finger near the tip of the constituent member firmly fixed in the bottom portion, In particular, the bottom portion of the liquid paper container can be easily disassembled and can be reduced in volume, can be easily disposed of, and by applying the technique of Patent Document 3, The present invention has been achieved by finding that a portion mainly composed of plastic can be easily separated and resources can be easily reused.
JP 2002-154527 A JP 2002-225845 A JP 2000-085756 A

  Therefore, the present invention provides a liquid paper container that can be easily peeled (disassembled) after use with a finger, can be reduced in volume, can be easily discarded, and can be easily reused. Is to provide.

  In order to achieve the above object, the inventor of the present invention includes a bottom portion having a quadrangular shape, and the bottom portion is connected to each of the bottom wall portion and both side wall portions at opposite positions. A projecting portion having a substantially triangular shape in plan view and projecting to the sides of the both side wall portions, and both the projecting portions and the bottom wall portion between both end portions of the projecting portions. And the other joint wall part at both ends of the both projecting parts of the other joint wall part. The first projecting piece is formed to project in a direction perpendicular to the longitudinal direction of the first wall, and the other palm wall portion is formed on the both projecting portions and the bottom wall portion at the inner edge thereof. Folding the two overhangs so that they come into contact with each other, the two overhangs are folded over to the bottom wall side, and the two overhangs are joined to the palm. A liquid paper container having the bottom portion fixed by a wall part, the liquid paper container being 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 Is formed such that an outer surface side portion and an inner surface side portion of the release layer are separable from each other in the release layer.

  Further, the present invention according to claim 2 includes a bottom portion having a quadrangular shape, and the bottom portion is connected to each of the bottom wall portion and the opposite side wall portions at opposite positions, and the respective sides of the both side wall portions. One extending wall portion and the other extending wall formed of a protruding portion having a substantially triangular shape in plan view and extending between the distal ends of the protruding portion and the protruding wall portion and the bottom wall portion. A joint-pasting wall part that seals the bottom part with the joint part, and both projecting parts of the other joint-wall part projecting in the direction perpendicular to the longitudinal direction of the other joint-wall part. A first projecting portion and a second projecting portion having a projecting length shorter than the first projecting portion at positions opposite to the first projecting portion at both ends of the projecting portion of the one palm wall portion A second projecting piece comprising: the joint-pasting wall portion at the inner edge of the two projecting portions and the bottom wall portion at the other joint. A liquid paper container having the bottom portion formed by folding the wall portions so that they abut, folding the both overhang portions to the bottom wall portion side, and fixing the both overhang portions with the jointed wall portions. The liquid paper container is composed of 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. The outer surface side portion and the inner surface side portion are configured to be separable from the layer.

  The present invention according to claim 3 is the liquid paper container according to any one of claims 1 and 2, wherein the release layer comprises an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin, a butyral resin, 1 formed from cyclized rubber resin, urethane resin, cellulose resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer modified urethane resin, polyamide resin, shellac alone or in mixture It consists of two layers or two different layers.

  Moreover, the present invention according to claim 4 is the liquid paper container according to any one of claims 1 to 3, wherein the release layer is a full surface coat or a layer having 95 to 5% of the total area in an arbitrary pattern. It is characterized by being formed.

  According to a fifth aspect of the present invention, in the liquid paper container according to the first or second aspect, 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 sixth aspect of the present invention, there is provided the liquid paper container according to any one of the first to fifth aspects, wherein the top of the liquid paper container is a govel top type and the outer surfaces of the top and the bottom are adjacent to each other. The adhesive strength adjusting layer is partially formed in the region where the material is thermally bonded.

  In the present invention, since the first projecting piece is formed to protrude, the first projecting piece can be easily grasped with fingers, and the overhanging portion can be peeled off by pulling up the first projecting piece. The liquid paper container can be easily folded to reduce the volume and can be easily discarded. Further, by forming the second projecting piece composed of the first projecting part and the second projecting part having different projecting lengths, the second projecting part is interposed between the first projecting part and the bottom wall part, Since the first projecting portion is further lifted from the bottom wall portion due to the presence of the second projecting portion, the first projecting portion can be easily grasped with fingers. It is.

  Further, the liquid paper container of the present invention comprises 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. Since the outer surface side portion and the inner surface side portion are separable from the release layer, the liquid paper container is disassembled after use, and the paper main part and the plastic main part from the end of the paper container. Since it can be separated and separated into parts, the resource of the used liquid paper container can be easily reused.

The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a layer configuration diagram schematically showing one embodiment of a laminate used in a liquid paper container according to the present invention, and FIG. 2 schematically shows another embodiment of a laminate used in a liquid paper container according to the present invention. FIG. 3 is a perspective view showing a first embodiment of a liquid paper container according to the present invention, FIG. 4 is a plan view showing a blank plate of the liquid paper container of FIG. 3, and FIG. 5 is a liquid paper of FIG. FIG. 6 is a plan view schematically illustrating the bottom of the liquid paper container of FIG. 3, and FIG. 7 is a diagram illustrating the volume-reduced state after disassembly of the liquid paper container of FIG. FIG. 8 is a view corresponding to FIG. 4 showing a second embodiment of the liquid paper container according to the present invention, FIG. 9 is a view corresponding to FIG. 5 of the liquid paper container of FIG. 8, and FIG. The figure which shows the state which begins to peel the outer surface side part which consists of a resin layer, a paper layer, and an adhesive resin layer from the edge part of a liquid paper container, 11 is a view showing a state where an outer surface side portion composed of a thermoplastic resin layer, a paper layer, and an adhesive resin layer is peeled over the entire length of the liquid paper container, and 1, 2, 3, and 4 in the figure are side wall plates. 5 is a glue piece, 1a, 2a, 3a and 4a are inclined roof forming plates, 1b, 2b, 3b and 4b are bottom forming plates, 6 is one palm wall portion, 7 is the other palm wall portion, and 8 is 1st protrusion, 9 is 2nd protrusion, 9 'is 1st protrusion part, 9 "is 2nd protrusion part, 10 and 30 are overhang | projection parts, 1s and 3s are the front-end | tip parts of overhang | projection part, 24 is bottom Wall part, 67 is a jointed wall part, P1 and P2 are liquid paper containers, P1 'and P2' are blank plates, L and L 'are laminates, L1 and L6 are polyethylene layers, L2 is a paper layer, and L3 is an adhesive A resin layer, L4, L4a, and L4b are release layers, L5 is a gas barrier layer, and α and β are adhesive strength adjusting layers.

  FIG. 1 is a layer configuration diagram showing an embodiment of a laminated body used in a liquid paper container according to the present invention. When the laminated body L is liquid paper containers P1 and P2 to be described later, a polyethylene layer L1 in order from the outer surface. Paper layer L2, adhesive resin layer L3, release layer L4, gas barrier layer L5 and polyethylene layer L6 (polyethylene layer L1 / paper layer L2 / adhesive resin layer L3 / release layer L4 / gas barrier layer L5 / polyethylene layer L6) The printed pattern is provided on the outer surface of the polyethylene layer L1. The release layer L4 is formed of the entire surface or a layer having an arbitrary pattern and having 95 to 5% of the entire area.

  FIG. 2 is a layer configuration diagram showing another embodiment of the laminated body used in the liquid paper container according to the present invention. When the laminated body L ′ is used as liquid paper containers P1 and P2 to be described later, polyethylene is sequentially formed from the outer surface. Layer L1, paper layer L2, adhesive resin layer L3, release layer L4b, release layer L4a, gas barrier layer L5, and polyethylene layer L6 (polyethylene layer L1 / paper layer L2 / adhesive resin layer L3 / release layer L4b / release layer L4a / Gas barrier layer L5 / polyethylene layer L6), and the printed pattern is provided on the outer surface of polyethylene layer L1. The release layer L4b and the release layer L4a are formed of the entire surface or a layer having an arbitrary pattern and having 95 to 5% of the entire area.

  In the case of the laminate L, the laminates L and L ′ are both “unraveled” or “folded” at the end faces of the laminates L and L ′, and the adhesive resin layer L3 and the release layer L4. And easily separated into an outer surface side portion composed of polyethylene layer L1 / paper layer L2 / adhesive resin layer L3 and an inner surface side portion composed of release layer L4 / gas barrier layer L5 / polyethylene layer L6. can do. The release layer L4 is peeled off while adhering to the gas barrier layer L5. Further, in the case of the laminate L ′, it is easily peeled off at the interface between the release layer L4b and the release layer L4a, or at the interface between the adhesive resin layer L3 and the release layer L4b, and the polyethylene layer L1 / paper layer L2. / Outer surface side portion composed of adhesive resin layer L3 / peeling layer L4b and inner surface side portion composed of peeling layer L4a / gas barrier layer L5 / polyethylene layer L6, or outer surface composed of polyethylene layer L1 / paper layer L2 / adhesive resin layer L3 It can be easily separated into a side portion and an inner surface side portion composed of release layer L4b / release layer L4a / gas barrier layer L5 / polyethylene layer L6.

  And as the resin which forms the said peeling layer L4 in case the said peeling layer L4 consists of one layer like the said laminated body L, metal foil surfaces, such as aluminum foil which comprises the gas barrier layer L5, or metals, such as aluminum Adhesiveness to the vapor-deposited surface of a biaxially stretched plastic film formed by vapor-depositing metal oxides such as silicon oxide, silicon oxide, and aluminum oxide is better than that of the vapor-deposited surface. Inferior resins are suitable, and examples thereof include acrylic resins, butyral resins, urethane resins, polyamide resins, and shellac. The release layer L4 is formed from a resin or a mixture of the above-described resins, and this ink is formed on the metal foil surface or metal oxide deposition surface constituting the gas barrier layer L5 by a known printing method such as gravure printing. Is done.

  In addition, as the resin in the case where the release layer is configured by two layers of the release layer L4b and the release layer L4a as in the laminate L ′, the release layer L4a includes an aluminum foil that constitutes the gas barrier layer L5. Acrylic resin, polyamide resin, shellac having good adhesion to a metal foil surface such as aluminum or a vapor-deposited surface of a biaxially stretched plastic film deposited with a metal such as aluminum or a metal oxide such as silicon oxide or aluminum oxide The release layer L4b formed on the surface of the release layer L4a has good adhesion to the adhesive resin layer L3 and can be peeled off at the interface with the release layer L4a. List vinyl-vinyl acetate copolymer resins, ethylene-vinyl acetate copolymer resins, ethylene-vinyl acetate copolymer-modified urethane resins, etc. It can be. The release layer L4b and the release layer L4a are vapor-deposited biaxially stretched plastic films on which a metal foil surface such as an aluminum foil constituting the gas barrier layer L5 or a metal oxide such as aluminum or a metal oxide such as silicon oxide or aluminum oxide is deposited. The surface is formed by a known printing method such as gravure printing. In addition, microcrystalline wax, silicone, or the like can be added to the release layers L4, L4a, and L4b in order to obtain a desired peel strength.

Examples of the polyethylene layer L1 include low density polyethylene, and the polyethylene layer L6 includes low density polyethylene, medium density polyethylene, linear low density polyethylene, and an ethylene-α olefin copolymer polymerized using a single site catalyst. Etc. Examples of the paper layer L2 include paperboard having a basis weight of 250 to 450 g / m ² . As the adhesive resin layer L3, low density polyethylene, ionomer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene- Examples thereof include ethyl acrylate copolymer (EEA) and ethylene-methyl methacrylate copolymer (EMMA). As the gas barrier layer L5, 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, biaxially stretched polyethylene terephthalate in which aluminum, silicon oxide, or aluminum oxide is vapor-deposited. A film or a biaxially stretched nylon film can be mentioned.

  Next, the present invention will be described by taking, as an example, a gobel top type liquid paper container having a top portion having an inclined roof as a liquid paper container. FIG. 3 is a perspective view showing the first embodiment of the liquid paper container according to the present invention, FIG. 4 is a plan view showing a blank plate of the liquid paper container of FIG. Side wall plate 1, side wall plate 2, side wall plate 3 and side wall plate 4 are connected to each other via a crease, and inclined roof portion forming plate 1 a and bottom portion forming plate 1 b are provided on the upper and lower ends of side plate 1. 2 is an inclined roof portion forming plate 2a and a bottom portion forming plate 2b, an upper and lower end of the side plate 3 is an inclined roof portion forming plate 3a and a bottom portion forming plate 3b, and an upper and lower end of the side plate 4 is an inclined roof. The portion forming plate 4a and the bottom forming plate 4b are connected to each other through a crease, and a crease is formed at a predetermined position of the inclined roof portion forming plates 1a, 3a and the bottom forming plates 1b, 3b, and the bottom forming plate 1b. , 3b, the blank plate P1 ′ having the first protrusions 8 and 8 formed at the predetermined positions is attached to the paste. The piece 5 is bonded to the back surface of the side plate 4 to form a cylindrical body, and then the bottom is formed into a flat bottom in the same manner as a so-called Brick type paper container, and then the contents from the top Is a liquid paper container in which a top portion is molded into a sloped roof, a predetermined portion is thermally bonded and sealed, and the top portion in which contents are stored is provided with a sloped roof portion. And the area | region (area | region shown with the halftone dot) where the surfaces of the said bottom part formation board 1b, 2b, 3b, 4b are heat-bonded, and the area | region where the surfaces of the said inclined roof part formation board 1a, 3a are heat-bonded ( A partial adhesive strength adjusting layer α and an adhesive strength adjusting layer β are formed in the areas indicated by halftone dots. Further, a printed pattern layer (not shown) is formed in a region excluding the region (region indicated by symbols α and β) to be thermally bonded on the surface of the blank plate P1 ′. Note that one of the palm wall portions (location indicated by (//) mark), which will be described later, is denoted by reference numeral 6, and the other palm wall portion (location marked by (\)) is denoted by reference numeral 7 in FIG. The one projecting piece 8, 8 is formed on the other joint wall 7 side of the boundary between one joint wall 6 and the other joint wall 7.

  The adhesive strength adjusting layers α and β are ethylene-vinyl acetate copolymer, chlorinated ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorinated polypropylene, cyclic rubber, polyamide resin, urethane resin, acrylic resin. It can be formed by printing using a resin ink composed of a simple substance of cellulose-based resin or alkyd resin or a mixture thereof. The area for forming the adhesive strength adjusting layers α, β is 20% or more of the region where the surfaces of the bottom forming plates 1b, 2b, 3b, 4b and the inclined roof forming plates 1a, 3a are thermally bonded to each other. The area is appropriate. The formation area of the adhesive strength adjusting layers α and β may be a dot area ratio of 20% or more, or may simply be 20% or more as an area. In this case, it is formed in an appropriate pattern. What should I do? The adhesive strength adjusting layers α and β are not necessarily provided, but are preferably provided, and either one may be provided.

  FIG. 5 is a diagram for explaining the bottom structure of the liquid paper container shown in FIG. 3. The bottom of the liquid paper container P1 has a quadrangular shape, and the bottom part includes a bottom wall part 24 formed by bottom part forming plates 2b and 4b. In a plan view substantially triangular shape formed by bottom portion forming plates 1b and 3b that are connected to the opposite side wall portions 1 and 3 at opposite positions and project to the sides of the opposite side wall portions 1 and 3, respectively. The overhanging portions 10 and 30 and one joint wall portion 6 composed of the overhanging portions 10 and 30 and the bottom wall portion 24 between both end portions 1 s and 3 s of the overhanging portions 10 and 30. A joint-pasting wall 67 that seals the bottom by sealing the other joint-wall 7 with the other-hand joint wall 7, and the other joint-wall part of the other joint-wall 7 is provided at both ends of the both projecting portions 10, 30 of the other joint-wall 7. It is composed of first projecting pieces 8 and 8 which are formed to project in a direction perpendicular to the longitudinal direction, The two overhanging portions 10, 30 and the bottom wall portion 24 are folded so that the other palm wall portion 7 is in contact with the both overhanging portions 10, 30 and the bottom wall portion 24 side. The both overhanging portions 10 and 30 are fixed by the joint-pasting wall portion 67 to form a bottom portion as shown in FIG. In FIG. 5, halftone dots indicating the region of the adhesive strength adjusting layer α are omitted.

  Next, a method for disassembling the liquid paper container P1 having the bottom structure as described above will be described. The first projecting pieces 8 and 8 are formed so as to protrude from the other palm wall portion 7 and float by the thickness of the one palm wall portion 6, so The projecting pieces 8 and 8 can be easily grasped, and the first projecting pieces 8 and 8 can be easily peeled from the bottom wall portion 24 by grasping and lifting the first projecting pieces 8 and 8 with the fingers, so that the state shown in FIG. Although not shown, the sloped roof portion is subsequently peeled off and folded so that the state shown in FIG. 7 can be obtained, and the bulky liquid paper container P1 can be reduced to a non-bulk state when discarded. Can be easily disposed of. Note that the order of dismantling is such that the inclined roof portion may be disassembled first. It should be noted that the areas where the surfaces of the bottom forming plates 1b, 2b, 3b, 4b are thermally bonded together (the areas indicated by the halftone dots α in FIG. 4) and the surfaces of the inclined roof forming plates 1a, 3a are thermally bonded together. By forming the adhesive strength adjusting layer in a region to be formed (region indicated by a halftone dot β in FIG. 4), the bottom portion and the inclined roof portion can be disassembled more easily as shown in FIG. it can.

  FIG. 8 is a view corresponding to FIG. 4 showing a second embodiment of the liquid paper container according to the present invention, FIG. 9 is a view corresponding to FIG. 5 of the liquid paper container of FIG. Instead of the first projecting pieces 8 and 8 provided on the liquid paper container P1 of the embodiment, the first projecting part 9 'having a long projecting length is used as the second projecting piece 9 and 9 having a substantially L shape, and the other projecting palm. The second projecting portion 9 ″ having a short projecting length is provided so as to be located on the one palm wall portion 6 so as to be located on the wall portion 7, and other than this, the liquid paper container of the first embodiment The same as P1 By forming the bottom as in the first embodiment, the first protrusion 9 ′ having the long protrusion length of the second protrusions 9 and 9 is exposed at the bottom, and the protrusion length is short. The second protrusion 9 ″ is interposed between the first protrusion 9 ′ having a long protrusion length and the bottom wall 24, and the second protrusions 9 and 9 The protruding portion 9 'can be assumed that more easily grasp with a finger, it can be a liquid packaging cartons P2 more easily disassembled than the liquid paper container of the first embodiment. In addition, although the 2nd protrusions 9 and 9 provided what provided 1st protrusion part 9 'and 2nd protrusion part 9' 'via the crease, 1st protrusion part 9' and 2nd protrusion part 9 were shown. "" Is not necessarily provided with a crease, but may be formed independently from the respective palm wall portions 6 and 7, but in consideration of the ease of the process of making a liquid paper container, As in the second embodiment, it is desirable that the first projecting portion 9 ′ and the second projecting portion 9 ″ are configured via a crease. Further, the first projecting pieces 8, 8 and the second projecting portion are used. The shape of the pieces 9 and 9 is not limited to the shape shown in the embodiment, but may be any shape as long as it can be grasped with fingers, in the second embodiment in FIG. An example in which the adjustment layers α and β are not provided is shown.

  Further, in the state of the volume-reduced liquid paper container shown in FIG. 7, for example, the side end portion where the bottom portion forming plate 4b, the side wall plate 4, and the inclined roof portion forming plate 4a are bonded to the glue margin piece 5 That is, the corners of the portions where the end portions of the laminates L and L ′ constituting the liquid paper container are exposed are bent, or peeled off by the release layer L4 of the laminate L by loosening or the like. As shown in FIG. 10, the outer surface side portion composed of the polyethylene layer L1, the paper layer L2, and the adhesive resin layer L3 is peeled off from the corner ends of the bottom portion forming plate 4b and the inclined roof portion forming plate 4a. As shown in FIG. 11, by peeling over the entire length of the side end portions of the bottom portion forming plate 4b, the side wall plate 4 and the inclined roof portion forming plate 4a, the peeling is further continued. , Mainly paper layer Can completely separate the inner surface portion of the plastic main body consisting of a surface-side portion and the gas barrier layer L5 and the polyethylene layer L6 Prefecture, disposal or recycling is made easy because it treated separately.

  Further, in the description so far, the top has been described as a gobeltop type liquid paper container having an inclined roof portion, but the liquid paper container of the present invention is not limited to this, and has been described in the background section. A brick-shaped paper container having a hexahedral shape, a hexagonal column shape obtained by deforming a brick-shaped paper container, a columnar paper container having a quadrilateral shape on the top and bottom, and an octagonal body on the top, and a rectangular shape on the bottom and having a top It may be a wedge-shaped paper container or the like that has been subjected to horizontal line sealing.

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

A 7 μm thick aluminum foil, a 12 μm thick biaxially stretched polyethylene terephthalate film and a 60 μm thick polyethylene film were laminated using a urethane-based adhesive, and then the resin ink A having the following composition was formed on the aluminum foil surface. , B was used to print an intermediate laminate 1 in which a release layer was formed by solid printing in the order of resin ink A and resin ink B on a gravure plate having a plate depth of 30 μm.
[Composition of resin ink A (parts by weight)]
Shellac [Nippon Shellac Industry: Rack Glaze 20E (trade name)] 20
・ Solvent [Ethanol] 80
[Composition of resin ink B (parts by weight)]
Nitrocellulose [Daicel Chemical Industries: SS1 / 4 (trade name)] 25
Solvent [ethyl acetate: toluene = 2: 3] 75

On the other hand, polyethylene having a thickness of 30 μm is laminated on one surface of 400 g / m ² cardboard (paperboard) by extrusion coating, and the intermediate laminate produced above is laminated on the other surface of the cardboard. Polyethylene (30 μm) / cardboard (400 g / m ² ) / polyethylene 25 μm / peeling layer B (polyethylene (30 μm) / polyethylene 25 μm thick) is laminated with the release layer surface positioned on the other surface side. A laminate was made of resin ink B) / release layer A (resin ink A) / aluminum foil (7 μm) / urethane adhesive / biaxially stretched polyethylene terephthalate (12 μm) / urethane adhesive / polyethylene 60 μm. The release layer of the obtained laminate had an adhesive force when it was integrated with the laminate to form a gobble top type liquid paper container. Moreover, when the edge part of the laminated body was bent, it was made to peel in the interface of the peeling layer A and the peeling layer B, and the laminated body was easily isolate | separated into the outer surface side part and the inner surface side part. After forming a printed pattern layer on the 30 μm-thick polyethylene surface of the laminate and forming an adhesive strength adjusting layer in a predetermined region by printing, after punching into the blank plate shown in FIG. 4 and cylinder-pasting the blank plate 3, 5, and 6, the top part (inclined roof part) and the bottom part were molded, and a predetermined portion was thermally bonded to prepare a gobeltop type liquid paper container. The top part (inclined roof part) and the heat bonding part of the outer surfaces of the bottom part of the gobeltop type liquid paper container obtained as described above can be easily peeled off and easily folded and reduced as shown in FIG. The laminated body constituting the liquid paper container is made of polyethylene (30 μm) / cardboard (400 g / m ² ) / by peeling the folded liquid paper container in the manner described with reference to FIGS. Easy on the outer side of the paper layer mainly composed of 25 μm of polyethylene and the inner side of the plastic mainly composed of aluminum foil (7 μm) / urethane adhesive / biaxially stretched polyethylene terephthalate (12 μm) / urethane adhesive / polyethylene 60 μm Could be separated. In this embodiment, the release layer A is integrated with the inner surface portion mainly composed of plastic, and the release layer B is integrated with the outer surface portion mainly composed of cardboard, and is peeled off at the interface between the release layer A and the release layer B. is there.

A laminate and a liquid paper container were produced in the same manner as in Example 1 except that the composition of the resin ink B was changed to the following composition. However, as in Example 1, the volume reduction of the liquid paper container intended by the present invention was made. In addition, the liquid paper container could be easily separated into the outer surface side portion and the inner surface side portion.
[Composition of resin ink B (parts by weight)]
・ Ethylene-vinyl acetate copolymer
[Mitsui Deyupon Polychemicals: Everflex 220 (trade name)] 10
・ Solvent [Toluene] 90

A laminate and a liquid paper container were prepared in the same manner as in Example 1 except that the composition of the resin ink A and the resin ink B was changed to the following composition. As in Example 1, the liquid paper container intended by the present invention was used. And the liquid paper container could be easily separated into an outer surface portion and an inner surface portion.
[Composition of resin ink A (parts by weight)]
Polyamide [Henkel Hakusui: Versamide 940 (trade name)] 30
Solvent [isopropyl alcohol: toluene = 1: 1] 70
[Composition of resin ink B (parts by weight)]
・ Ethylene-vinyl acetate copolymer
[Mitsui Deyupon Polychemicals: Everflex 220 (trade name)] 10
・ Solvent [Toluene] 90

It is a layer block diagram which shows one Example of the laminated body used for the liquid paper container concerning this invention schematically. It is a layer block diagram which shows other examples of the laminated body used for the liquid paper container concerning this invention schematically. It is a perspective view which shows 1st Embodiment of the liquid paper container concerning this invention. It is a top view which shows the blank board of the liquid paper container of FIG. It is a figure explaining the bottom part structure of the liquid paper container of FIG. FIG. 4 is a plan view schematically showing the bottom of the liquid paper container of FIG. 3. FIG. 4 is a plan view schematically showing a volume-reduced state of the liquid paper container of FIG. 3 after disassembly. It is a figure corresponding to FIG. 4 which shows 2nd Embodiment of the liquid paper container concerning this invention. It is a figure corresponding to FIG. 5 of the liquid paper container of FIG. It is a figure which shows the state which begins to peel from the edge part of a liquid paper container the outer surface side part which consists of a thermoplastic resin layer, a paper layer, and an adhesive resin layer. It is a figure which shows the state which peeled the outer surface side part which consists of a thermoplastic resin layer, a paper layer, and an adhesive resin layer over the full length of a liquid paper container.

Explanation of symbols

1, 2, 3, 4 Side wall plate 5 Adhesive strip 1a, 2a, 3a, 4a Inclined roof forming plate 1b, 2b, 3b, 4b Bottom forming plate 6 One joint wall portion 7 The other joint wall portion 8 First protrusion Piece 9 Second protruding piece 9 'First protruding portion 9 "Second protruding portion 10, 30 Overhang portion 1s, 3s End portion of overhang portion 24 Bottom wall portion 67 Jointed wall portion P1, P2 Liquid paper container P1' , P2 ′ Blank plate L, L ′ Laminate L1, L6 Polyethylene layer L2 Paper layer L3 Adhesive resin layer L4, L4a, L4b Release layer L5 Gas barrier layer α, β Adhesive strength adjustment layer

Claims (6)

A bottom portion having a quadrangular shape, the bottom portion being connected to each of the bottom wall portion and the opposite side wall portions at opposite positions, and projecting to the sides of the opposite side wall portions in a substantially triangular shape in plan view. The bottom part is sealed by gluing and sticking one joint wall part composed of the projecting part and the two projecting parts and the bottom wall part between the two projecting parts and the bottom wall part. It is composed of a joint-pasting wall portion, and a first projecting piece that is formed to project in a direction perpendicular to the longitudinal direction of the other joint-wall portion at the both ends of the both overhang portions of the other joint-wall portion, Folding the joint-pasting wall part at the inner edge thereof so that the other joint-wall part comes into contact with the two projecting parts and the bottom wall part, and folding the both projecting parts on the bottom wall part side, A liquid paper container having the bottom portion formed by fixing the both overhang portions with the joint-pasting wall portion, It consists of 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 surface, and an outer surface side portion and an inner surface from the release layer in the release layer A liquid paper container characterized in that the side portion is separable. A bottom portion having a quadrangular shape, the bottom portion being connected to each of the bottom wall portion and the opposite side wall portions at opposite positions, and projecting to the sides of the opposite side wall portions in a substantially triangular shape in plan view. The bottom part is sealed by gluing and sticking one joint wall part composed of the projecting part and the two projecting parts and the bottom wall part between the two projecting parts and the bottom wall part. A first projecting portion formed on both ends of the joint-pasting wall portion and the two projecting portions of the other joint-wall wall portion and projecting in a direction perpendicular to the longitudinal direction of the other joint-wall portion and the one joint-wall And a second projecting piece formed of a second projecting portion that is at both ends of the projecting portion of the portion and that is opposed to the first projecting portion and has a projecting length shorter than the first projecting portion. Folding the jointed wall part so that the other jointed wall part comes into contact with the two overhanging parts and the bottom wall part at the inner edge thereof And a liquid paper container having the bottom portion formed by folding the both overhang portions on the bottom wall portion side, and fixing the both overhang portions with the joint-pasting wall portion. It consists of 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, and an outer surface side portion and an inner surface side portion from the release layer in the release layer And a liquid paper container characterized by being configured to be separable. The release layer is an acrylic resin, vinyl chloride-vinyl acetate copolymer resin, butyral resin, cyclized rubber resin, urethane resin, cellulose resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl acetate. The liquid paper container according to any one of claims 1 and 2, wherein the liquid paper container is composed of one layer or two different layers formed of a copolymer-modified urethane resin, a polyamide resin, or shellac alone or in a mixture. The liquid paper container according to any one of claims 1 to 3, wherein the release layer is formed of a whole surface coat or a layer having 95 to 5% of the total area in an arbitrary pattern. 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 liquid paper container according to any one of claims 1 to 5, wherein the top of the liquid paper container is a govel top type and is partially bonded to a region where the outer surfaces of the top and bottom are thermally bonded to each other. A liquid paper container in which a strength adjusting layer is formed.

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