JP2017159945A - Paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container for liquid which has performance as a paper container for liquid, can be easily disassembled after use, and is easily discarded.SOLUTION: A paper container for liquid which is a gable top type paper container for liquid that is formed of a laminate having a polyolefin resin layer, a paper layer, an intermediate layer and an adhesive resin layer in a thickness direction, and is formed of a cylindrical body portion in a state where a front plate, a rear plate and both side plates are connected, a top portion that is a top portion formation plate in a state of being connected to the front plate, the rear plate and both of the side plates and blocks an upper end of the body portion, and a bottom portion that blocks a lower end of the body portion with a bottom portion formation plate in a state of being connected to the front plate, the rear plate and both of the side plates, where the paper container has scratches from the polyolefin resin layer to the paper layer, the intermediate layer has a barrier layer and a base material layer, and the base material layer is a hand-tearable film.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gable-top type liquid paper container used for packaging liquid beverages such as sake, wine, shochu and other alcoholic beverages, coffee, milk beverages, juice, tea, etc., and particularly used liquid paper The present invention relates to a gobeltop liquid paper container that can be easily disassembled when the container is discarded.

  Conventionally, a gobeltop type liquid paper container has been widely used for packaging liquid beverages such as sake, wine, shochu and other alcoholic beverages, coffee, milk beverages, juice, tea and the like. Such a liquid paper container is made of a laminate, and has a configuration in which a barrier layer such as an aluminum foil layer, an aluminum vapor deposition layer, or an inorganic oxide vapor deposition layer is provided in order to prevent oxidative deterioration and taste deterioration of the contents. (For example, refer to Patent Document 1).

  In recent years, when empty containers after use have been disposed of due to increasing environmental problems, separation by type of containers and volume reduction of containers have been performed, and empty containers have been dismantled. In particular, in the case of a gobeltop type liquid paper container, a pouring spout for pouring out the liquid contents is usually fixed to the top forming plate at the top, and the pouring spout can be easily separated. could not. In order to separate the spout plug, first the top bonding part is opened, and then the top forming plate on the side to which the spout plug is fixed is cut with a scissors or the like to surround the spout plug. The separation operation of cutting off the cut-out outlet plug from the top forming plate has been performed.

  However, the separation operation is time-consuming and troublesome, and the top adhesive part of the gobeltop type liquid paper container is firmly heat-bonded by high temperature and high pressure to prevent leakage of the liquid contents. In some cases, it was difficult to manually open the bonded portion.

  Therefore, the end of the container body forming sheet on the outer surface side of the body side seal part overlapped with the pull tab formed of an easily peelable tape-like film is used to cut through the side plate of the body part, A liquid paper container that can be disassembled from the trigger is disclosed (see, for example, Patent Document 2). However, the liquid paper container disclosed in Patent Document 2 requires an extra easily peelable tape-like film, and the side seal portion of the body portion is stable because the easily peelable tape-like film is interposed. Sealing may not be possible.

JP 2006-321495 A Japanese Patent No. 3844310

  Accordingly, an object of the present invention has been made to solve the above-described problems, and a liquid paper container that has performance as a liquid paper container, can be easily disassembled after use, and is easy to dispose of. Is to provide.

  In order to achieve the above object, the present invention according to claim 1 is composed of a laminate including a polyolefin resin layer, a paper layer, an intermediate layer, and an adhesive resin layer in the thickness direction, A cylindrical body having a front plate, a rear plate, and both side plates connected to each other; a top portion that closes an upper end of the barrel with a top forming plate connected to the front plate, the rear plate, and both side plates; and A gobel top type liquid paper container comprising a bottom portion that closes a lower end of the body portion with a bottom forming plate connected to the front plate, the rear plate, and the both side plates, from the polyolefin resin layer to the paper layer A liquid paper container having a flaw across the intermediate layer, wherein the intermediate layer includes a barrier layer and a base material layer, and the base material layer is a hand-cut film.

  According to a second aspect of the present invention, in the liquid paper container according to the first aspect, the scratch extends across the front plate, the rear plate, and the both side plates, and extends around the entire circumference of the trunk portion. It is characterized by being provided in a shape.

  According to a third aspect of the present invention, in the liquid paper container according to the first or second aspect, the both side plates of the body portion and the central portion of the top portion forming plate connected to the both side surface plates are provided. Each is provided with a body part fold line for folding the body part and a top part fold line for folding the top part.

  As described above, according to the present invention, it is possible to provide a liquid paper container that has performance as a liquid paper container, can be easily disassembled after use, and can be easily discarded.

It is a perspective view which shows one Embodiment of the liquid paper container which concerns on this invention. It is sectional drawing which shows the laminated body example of one Embodiment of the liquid paper container which concerns on this invention. It is a top view which shows the blank of one Embodiment of the liquid paper container which concerns on this invention. It is explanatory drawing which shows the effect | action of one Embodiment of the liquid paper container which concerns on this invention. It is explanatory drawing which shows the effect | action of one Embodiment of the liquid paper container which concerns on this invention.

The above-described present invention will be described in detail below with reference to the drawings.
1 is a perspective view showing an embodiment of a liquid paper container according to the present invention, FIG. 2 is a cross-sectional view showing an example of a laminated body of an embodiment of the liquid paper container according to the present invention, and FIG. 3 is a liquid paper according to the present invention. FIG. 4 and FIG. 5 are explanatory views showing the operation of an embodiment of a liquid paper container according to the present invention, in which A is a liquid paper container, and A ′ is a plan view showing a blank of an embodiment of the container. Empty liquid paper container, B is blank, C and C 'are laminates, D is scratches, 1 is a polyolefin resin layer, 2 is a paper layer, 3 is an adhesive layer, 4 is an intermediate layer, 4a is a substrate Layers 4b and 4c are barrier layers, 6 is an adhesive resin layer, 10 and 10 'are body parts, 10a is a body part fold line, 11 is a rear panel, 12, 14 are side panels, 13 is a front panel, and 15 is an adhesive. 20, 20 ′ is the top part, 20 a is the top fold line, 21, 22, 23, 24 are the top part forming plates, 25 is the spout plug mounting hole, 26 is The spout plugs, 27 and 27 'are top adhesive portions, 30 is a bottom portion, 31, 32, 33, and 34 are bottom portion forming plates, respectively.

  FIG. 1 is a perspective view showing an embodiment of a liquid paper container according to the present invention. As shown in FIG. 1, the liquid paper container A of the present invention has a cylindrical body portion 10 having four side surfaces, a gable roof top 20 that closes the upper end of the body portion 10, and a lower end of the body portion 10. And a bottom part 30 that is a Goebel top type liquid paper container. In FIG. 1, a front plate 13 and a side plate 12 that form the body 10, and a top forming plate 23 that is connected to the front plate 13 that forms the top 20 and a top forming plate 22 that is connected to the side plate 12 are visible. . A spout stopper 26 having a spout main body and a cap is attached to the inclined surface of the top forming plate 23. The top forming plate 22 is folded into a triangular inclined surface. Usually, the spout stopper 26 is provided.

  FIG. 2 is a cross-sectional view showing an example of a laminated body constituting the liquid paper container A according to the present invention. As shown in FIG. 2 (a), the laminated body C includes a polyolefin resin layer 1 and a paper layer 2 in the thickness direction. The intermediate layer 4 and the adhesive resin layer 6 are provided, and the intermediate layer 4 includes a base material layer 4a and a barrier layer 4b. Then, an adhesive layer 3 and an adhesive layer 5 are provided and laminated between the paper layer 2 and the intermediate layer 4 and between the intermediate layer 4 and the adhesive resin layer 6 as necessary. The barrier layer 4b is a layer having moisture resistance and gas barrier properties, and has a property of chemically protecting the content filled in the liquid paper container A by preventing oxidative deterioration, taste deterioration, etc. They are a metal vapor deposition layer, such as aluminum, provided on the base material layer 4a, or a vapor deposition layer in which an inorganic substance such as aluminum oxide or silicon oxide is vapor deposited. A stacked body C ′ shown in FIG. 2 (b) shows an example in which a metal foil such as aluminum is used as the barrier layer 4 c and has the same properties as the barrier layer 4 b. The barrier layer 4c is laminated with the base material layer 4a by a dry lamination method or an extrusion lamination method. The barrier layer 4b of the intermediate layer 4 of the laminate C is laminated on the paper layer 2 and adhesive layer 3 side, but the barrier layer 4b can also be laminated on the adhesive resin layer 6 and adhesive layer 5 side. The barrier layer 4c of the intermediate layer 4 of the laminate C ′ is preferably laminated on the paper layer 2 and the adhesive layer 3 side. Moreover, although not shown in figure, a printing layer can also be provided in the exposed surface of the polyolefin-type resin layer 1 on the opposite side to the paper layer 2 side.

As shown in FIG. 2, the polyolefin resin layer 1 and the paper layer 2 are provided with scratches D.
The scratch D extends from the polyolefin resin layer 1 to the paper layer 2 and penetrates through the polyolefin resin layer 1 to reach the paper layer 2, and the depth of the scratch in the thickness direction is from the polyolefin resin layer 1 to the paper layer 2. It is preferable that it is provided so as to reach approximately 1/2 or more of the thickness. Further, although the paper layer 2 may be penetrated, in this case, the shape of the scratch D is preferably a perforation.

  Although it will be described later, the scratch D is provided to separate the top 20 and the body 10 of the empty liquid paper container A ′ (see FIG. 4) after use, and the body 10 and the top 20 are connected in FIG. Since it becomes easy to separate, it is a preferable mode to provide it in the form of a line at or near the ridgeline.

  Next, the laminates C and C ′ for producing the liquid paper container A of the present invention will be described. As the polyolefin-based resin layer 1 on the exposed surface, a heat-bondable resin such as low-density polyethylene or linear low-density polyethylene is used. These resins are laminated on the paper base material of the paper layer 2 by an extrusion lamination method.

As the paper base of the paper layer 2, a paperboard having a basis weight of 250 to 450 g / m ² is used.

  The adhesive layer 3 is a layer for adhering the paper layer 2 and the intermediate layer 4, and is a low density polyethylene, a linear low density polyethylene, an ethylene-α olefin copolymer, an ionomer, an ethylene-acrylic acid copolymer, an ethylene- A polyolefin resin such as a methacrylic acid copolymer, an ethylene-acrylic acid ester copolymer, and an ethylene-methacrylic acid ester copolymer is used, and the paper layer 2 and the intermediate layer 4 are laminated by an extrusion lamination method. The thickness is usually 10 to 50 μm.

The intermediate layer 4 includes a base material layer 4a and a barrier layer 4b or a barrier layer 4c, and a hand cut film is used for the base material layer 4a.
In the present invention, a film that can be torn by hand is referred to as a hand-cut film, and is defined as a stretched film having a propagation resistance value of 40 mN or more and 75 mN or less in the machine direction (MD) and the transverse direction (TD). In addition, propagation resistance value says the measured value by the tear strength test method of Japanese Industrial Standard (JISK7128).
Cellophane and polyester films are examples of hand-cut films. Since barrier properties can be imparted, hand-cut polyester films are particularly preferable, and specific examples include Tear Fine manufactured by Toyobo Co., Ltd. The barrier layer 4b is a vapor deposition layer provided on the base material layer 4a. The vapor deposition layer uses the base material layer 4a as a carrier to deposit a metal such as aluminum or an inorganic material such as aluminum oxide or silicon oxide on the base layer 4a. Is provided. The barrier layer 4c is a metal foil such as aluminum provided on the base material layer 4a, and the thickness of the metal foil is 6 μm to 12 μm. The metal foil as the base material layer 4a and the barrier layer 4c is laminated by a dry lamination method or an extrusion lamination method.

The adhesive layer 5 is for laminating the intermediate layer 4 and the adhesive resin layer 6 by the extrusion lamination method using the same resin as that of the adhesive layer 3, and the thickness is usually 10 to 50 μm. Further, as the adhesive layer 5, a dry lamination method using a two-component type adhesive for dry laminating comprising a main component such as polyester polyol-isocyanate, polyether polyol-isocyanate, urethane-isocyanate and a curing agent as an adhesive. Can also be laminated. In the case of the dry lamination method, the coating amount of the adhesive layer 5 is usually a solid content weight of 1 to 5 g / m ² .

  The adhesive resin layer 6 is a heat-adhesive resin, and a film using a resin such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene is used. In particular, it is preferable to use a film imparted with easy tearing property or linear cutting property using a cyclic polyolefin resin or the like. The thickness of the adhesive resin layer 6 is usually 20 to 100 μm, and is appropriately determined in consideration of conditions such as a method of laminating the adhesive layer 5 and contents.

FIG. 3 is a plan view seen from the outside showing a blank B of one embodiment of the liquid paper container A according to the present invention. As shown in FIG. 3, in the blank B, the rear plate 11, the side plate 12, the front plate 13, the side plate 14, and the adhesive plate 15 for forming the cylindrical body 10 are vertically folded (in FIG. 3, the vertical direction). ), Top forming plates 21, 22, 23, and 24 are connected to the respective upper end edges via horizontal folding rules (left and right in FIG. 3), and the bottom 30 is connected to each lower end edge. The bottom forming plates 31, 32, 33, and 34 for forming are connected via horizontal folding rules, and a body fold line 10 a is formed at the center of the side plate 12 and the side plate 14, respectively. It consists of a straight line extending in the vertical direction from the top to the bottom, and a diagonal line in which the straight line is separated in two directions obliquely downward in the lower part. Specifically, one oblique line of the body folding line 10 a formed on the side plate 12 is directed to the corner on the bottom forming plate 31 side at the upper end of the bottom forming plate 32, and the other oblique line forms the bottom portion at the upper end of the bottom forming plate 32. It extends toward the corner on the plate 33 side. One oblique line of the body folding line 10a formed on the side plate 14 is directed to the corner on the bottom forming plate 33 side at the upper end of the bottom forming plate 34, and the other oblique line is a corner on the adhesive plate 15 side on the upper end of the bottom forming plate 34. It extends toward. A top fold line 20a extending in the vertical direction is formed at the center of the top forming plates 22 and 24, respectively. Note that the top fold line 20a and the body fold line 10a are formed in a state where they are not in contact with the folds connecting the side plate 12 and the top forming plate 22 and the side plate 14 and the top forming plate 24 with a slight gap therebetween. . By doing so, deformation of the liquid paper container A can be prevented, which is preferable.
For the same reason, the oblique line below the body part folding line 10a is also formed in a state of being slightly spaced without contacting the crease. The body fold line 10a and the top fold line 20a are preferably provided, and the folding operation of the empty liquid paper container A ′ after use becomes easy.

  Further, as shown in FIG. 3, the spout plug attaching hole 25 is provided in the top forming plate 23. The spout stopper mounting hole 25 is for attaching a spout stopper 26 (see FIG. 1) made of, for example, a plastic by injection molding when a gable top type liquid paper container is manufactured. The spout stopper 26 is attached if necessary.

  The liquid paper container A of the present invention is produced by punching a blank B shown in FIG. 3 with a punching die having a ruled line and a cutting edge using a laminate C, C ′ or the like. Further, when the scratch D is also punched out, it is formed by half cutting with a mold having a predetermined half cutting blade. The half-cut blade can be formed simultaneously with the punching by providing the punching die. When the punching die and the half-cut die are separately used, it is preferable to perform in the inline process because the registration accuracy of the punching position and the half-cutting position is improved. The crease, the body fold line 10a and the top fold line 20a are simultaneously formed by stamping when punching. In FIG. 3, the crease is indicated by a one-dot chain line, and the body fold line 10 a and the top fold line 20 a are indicated by broken lines.

  The laminated body C, C ′ of the blank B constituting the liquid paper container A of the present invention is provided with a scratch D in a straight line parallel to the horizontal folding ruled line (left and right direction in FIG. 3). Since the scratch D is formed across the rear plate 11, the side plate 12, the front plate 13, the side plate 14, and the adhesive plate 15 and across the blank B, assembling the body of the liquid paper container A as shown in FIG. It is provided so as to make a round over the entire circumference of the portion 10. The position where the scratch D is formed is a position where the body 10 and the top 20 are connected, that is, the rear plate 11 and the top forming plate 21, the side plate 12 and the top forming plate 22, the front plate 13 and the top forming plate 23, and the side plate. 14 and the top forming plate 24 are connected to the horizontal folding rule (hereinafter referred to as a top forming horizontal folding rule) and the position of the top forming horizontal folding ruler formed on the adhesive plate 15 connected thereto, or the top forming plate. It can be provided in a range within 50 mm downward from the position of the horizontal folding ruler. A more preferable position is in a range 35 mm below from a position 15 mm or more away from the top forming horizontal folding ruler. Moreover, it is preferable that the damage | wound D is made into the straight line in which a damage | wound continues, or a square-shaped perforation shape. The C-shaped perforations are formed side by side along the top forming horizontal folding rule and can be provided in about 1 to 3 rows. FIG. 3 shows an example of forming the scratches D by enlarging the part in the circle, (A) shows an example of a straight line, and (B) shows an example in which two rows of C-shaped perforations are provided. The scratch D can be provided by performing a half-cut process so as to extend from the polyolefin resin layer 1 laminated on the paper layer 2 to the paper layer 2.

  The blank B shown in FIG. 3 is formed into a cylindrical shape by thermally bonding the rear plate 11 and the adhesive plate 15, and then the rear plate 11, the side plate 12, the front plate 13, and the side plate 14 are bent by vertical folding rules. The bottom portion 30 is formed by bending the bottom forming plates 31, 32, 33, and 34 with a crease and thermally bonding them, thereby forming one opening of the square tubular body portion 10. Close the lower end. After filling the contents from the upper end, the top forming plates 21, 22, 23, and 24 are bent with creases to form the top portion 20, and extended to the upper ends of the top forming plates 21, 22, 23, 24 and the adhesive plate 15. The top adhesive portion 27 (see FIG. 1) is formed by thermally adhering the top adhesive portion 27 ′, and the upper end of the body portion 10 is closed to produce a gobber-top type liquid paper container A. The top forming plates 22 and 24 are formed with creases obliquely. This is because the top forming plate 22 is folded by the creases and the triangular portion adjacent to the top forming plate 21 is formed on the top forming plate 21. The triangular portions adjacent to the plate 23 are superposed on the inner surface of the top forming plate 23 to form a triangular inclined roof. The top forming plate 24 is similarly formed with a triangular inclined roof.

  In the top bonding portion 27, the inner surface is hard to open by hand because the adhesive resin layers 6 face each other and are thermally bonded to be strongly bonded. Further, the top bonding portion 27 ′ extended to the top forming plates 21, 23 is provided so as to extend outwardly and become longer than the top bonding portion 27 ′ extended to the top forming plates 22, 24. The upper end of the bonding portion 27 is configured such that the inner surfaces of the top bonding portions 27 ′ extended to the top forming plates 21 and 23 are directly heat bonded. The spout stopper 26 is attached to the spout stopper mounting hole 25 by thermal bonding, for example, by an ultrasonic sealing method or the like before the contents are filled.

  4 and 5 are explanatory views showing the operation of one embodiment of the liquid paper container according to the present invention. The disassembling procedure of the liquid paper container A of the present invention will be described with reference to FIGS. In the liquid paper container A (see FIG. 1), first, the top folding line 20a and the body folding line 10a of the top forming plate 22 shown in FIG. 4 (a) are folded inward, and the top forming line 24 is similarly folded. The body fold line 10a is folded inward.

  Next, as shown in FIG. 5B, the top forming plate 22 and the top forming plate 24, and the side plate 12 and the side plate 14 are folded inward at the top folding line 20a and the trunk folding line 10a, respectively. To do. Although not shown, the bottom portion can be folded by pressing the thumb in the vicinity of the oblique line below the body folding line 10a and pushing it inward.

  FIG. 5 (b) shows a case where the body part 10 ′ disassembled with one hand and the top part 20 ′ dismantled with the other hand are gripped, and a straight wound D formed over the entire circumference of the body part 10 is used as a rotation axis. As shown in FIG. 5 (c), the forward rotation and the reverse rotation are alternately repeated, so that the top 20 'and the body 10' can be separated at the straight scratches D as shown in FIG. Thereafter, the periphery of the spout plug 26 at the top portion 20 ′ is cut off to separate the spout plug 26. The liquid paper container that has been difficult to disassemble up to now can be easily cut by hand by the top 20 'according to the present invention, so that the empty liquid paper container A' after use can be easily disassembled and the collection outlet 26 can be separated and collected easily. It became.

Next, the present invention will be described in more detail with reference to examples.
[Example 1]

A film obtained by applying aluminum vapor deposition to a biaxially stretched hand-cut polyester film (Toyobo Co., Ltd., Tiafine TF110) having a thickness of 12 μm as the intermediate layer 4 using paperboard 382 g / m ² as the paper layer 2. VMTOX)), one side of the paper layer 2 and the aluminum vapor deposition surface of VMTOX are melt-extruded with a T-die extruder using an ethylene-methacrylic acid copolymer resin as an adhesive layer 3, and provided with a thickness of 20 μm. Sandramination was performed, and a low-density polyethylene resin was melt-extruded on the other surface of the paper layer 2 by a T-die extruder to laminate a polyolefin resin layer 1 having a thickness of 25 μm. An anchor coat was applied to both sides of the paper layer 2 during lamination.

  A linear low-density polyethylene resin unstretched film having a thickness of 40 μm is used as the adhesive resin layer 6, a low-density polyethylene resin is used as the adhesive layer 5, melt-extruded by a T-die extruder, and provided with a thickness of 20 μm. The surface opposite to the aluminum deposition surface and the adhesive resin layer 6 were subjected to sand lamination. A laminate C was prepared by applying a corona treatment to the surface opposite to the aluminum vapor deposition surface of VMTOX, and applying a corona treatment to the exposed surface of the polyolefin-based resin layer 1 at the time of lamination to improve printability.

  Thereafter, a pattern, characters, etc. are printed on the corona-treated surface of the polyolefin resin layer 1 of the laminate C by a printing machine, and a punching die provided with a predetermined cutting edge, ruled line, body fold line 10a, and top fold line 20a. The blank shown in FIG. 3 was produced by punching. Scratch D was punched at the same time as a half cut across the polyolefin resin layer 1 to the paper layer 2 with a half cut blade. The positions of the scratches D provided in a straight line are such that the rear plate 11 and the top forming plate 21, the side plate 12 and the top forming plate 22, the front plate 13 and the top forming plate 23, and the side plate 14 and the top forming plate 24 are connected. The rear plate 11, the side plate 12, the front plate 13, the side plate 14, and the adhesive plate 15 are provided on the body 10 side 20 mm below the horizontal crease for forming the top portion.

  Thereafter, a vertical folding rule (up and down direction in FIG. 3) from the upper end to the lower end of the blank B applied between the side plate 12 and the front plate 13 using the box making machine and between the side plate 14 and the adhesive plate 15. The applied blank B was folded with vertical creases extending from the upper end to the lower end, and the outer surface of the adhesive plate 15 and the inner surface of the rear plate 11 were wound and thermally bonded with a frame to form a folded sleeve. The adhesive plate 15 was skived and hemmed so that the end surface of the blank B was not touched with the contents.

  Then, the box-shaped sleeve-shaped liquid paper container was raised, and the spout stopper 26 was attached and assembled to the spout stopper mounting hole 25 to produce the liquid paper container A shown in FIG.

[Example 2]
The same procedure as in Example 1 was conducted except that a biaxially stretched hand-cut polyester film having a thickness of 12 μm (Tearfine TF110, manufactured by Toyobo Co., Ltd.) was used as the intermediate layer 4.

Example 3
The intermediate layer is VMTOX of Example 1, and an unstretched film of a linear low density polyethylene resin having a thickness of 60 μm is used as the adhesive resin layer 6, respectively. First, the aluminum vapor deposition surface of VMTOX and the adhesive resin layer 6 are urethane-based. The same procedure as in Example 1 was conducted except that a two-component curable dry laminate adhesive was used for lamination by a dry lamination method.

Example 4
A 12-μm thick biaxially stretched hand-cut polyester film (Tearfine TF110, manufactured by Toyobo Co., Ltd.) is used as the intermediate layer 4, and a 60 μm-thick straight chain is used as the adhesive resin layer 6. Non-stretched films of low-density polyethylene resin, respectively, except that the silicon oxide vapor-deposited surface of the intermediate layer 4 and the adhesive resin layer 6 were first laminated by a dry lamination method using a urethane-based two-component curable dry laminate adhesive Was the same as in Example 1.

Example 5
A 12 μm thick biaxially stretched hand-cut polyester film (Tearfine TF110, manufactured by Toyobo Co., Ltd.) is used as the base layer 4a as the intermediate layer 4, and a 7 μm thick aluminum foil is used as the barrier layer 4c. Lamination was performed by a dry lamination method using a two-component curable dry laminate adhesive. Further, a non-stretched film of a linear low density polyethylene resin having a thickness of 60 μm is used as the adhesive resin layer 6 on the opposite side of the base material layer 4a on which the barrier layer 4c is laminated, and a urethane-based two-component curable dry laminate adhesive. Was laminated by a dry lamination method. Otherwise, the same procedure as in Example 1 was performed. The aluminum foil of the barrier layer 4c was on the adhesive layer 3 side.

[Comparative Example 1]
The same procedure as in Example 1 was performed except that a biaxially stretched polyester film (Toyobo Co., Ltd., ester film E5200) having a thickness of 12 μm and having no hand cutting property was used for the base material layer 4a of the intermediate layer 4.

[Comparative Example 2]
The same procedure as in Example 1 was performed except that the polyolefin resin layer 1 and the paper layer 2 were not provided with the scratch D.

  For the liquid paper containers of Examples 1 to 5 and Comparative Examples 1 and 2 prepared above, the disassembling property was evaluated by the above-described disassembly method, and the reciprocating bending operation was repeated several times for the liquid paper containers of Examples 1 to 5. It was possible to separate the top part and the body part. In the liquid paper containers of Comparative Examples 1 and 2, separation was not possible even when the folding operation was repeated 20 times.

A, A ′ Liquid paper container B Blank C, C ′ Laminate D Scratch 1 Polyolefin resin layer 2 Paper layer 3, 5 Adhesive layer 4 Intermediate layer 4a Base material layer 4b, 4c Barrier layer 6 Adhesive resin layer 10, 10 'Body part 10a Body part folding line 11 Rear plate 12, 14 Side plate 13 Front panel 15 Adhesive plate 20, 20' Top part 20a Top part folding line 21, 22, 23, 24 Top forming plate 25 Outlet plug mounting hole 26 Outlet plug 27 27 'Top adhesive part 30 Bottom part 31, 32, 33, 34 Bottom forming plate

Claims (3)

A cylindrical body portion composed of a laminate including a polyolefin-based resin layer, a paper layer, an intermediate layer, and an adhesive resin layer in a thickness direction, and a front plate, a rear plate, and both side plates connected to each other; and the front plate The top plate closing the upper end of the barrel with a top forming plate connected to the rear plate and the side plates, and the bottom forming plate connected to the front plate, the rear plate and the side plates. A gobel top type liquid paper container consisting of a bottom part closing the lower end,
Having scratches across the paper layer from the polyolefin resin layer,
The intermediate layer includes a barrier layer and a base material layer, and the base material layer is a hand-cut film. 2. The liquid paper container according to claim 1, wherein the scratch is provided in a linear shape extending over the entire circumference of the trunk portion across the front plate, the rear plate, and the both side plates. A body fold line for folding the body portion and a top fold line for folding the top portion are provided at the center portions of the side surface plates of the body portion and the top portion forming plate connected to the both side surface plates, respectively. The liquid paper container according to claim 1 or 2, characterized by the above.

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