JP2663277B2 - How to attach the spout when molding a paper container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper container which does not deteriorate the quality of the filling material, that is, a paper container having excellent quality retention characteristics. The present invention relates to a method for attaching the spouting tool when molding a paper container having a spouting tool made of another polyolefin resin.

[Conventional technology]

A pouring tool made of a polyolefin resin is inserted into an opening formed in the paper container from the inside of the paper container, and a flange portion of the pouring tool is fixed to the inner peripheral surface side of the paper container. Paper containers are widely used as liquid paper containers for filling beverages and the like.

The paper container is made of a laminated sheet for a paper container in which both front and back layers are composed of a polyolefin-based resin layer, and a flange portion of a spout is thermally bonded to an inner peripheral surface layer of the paper container. In general, a configuration having such a configuration is adopted.

[Problems to be solved by the invention]

By the way, in the conventional paper container, when forming a polyolefin resin layer when obtaining a laminated sheet which is a material for molding the paper container, or when forming a paper container using the laminated sheet, the polyolefin resin is heated. Decomposition produces volatile components such as aliphatic hydrocarbons, and the volatile components migrate into the fillings contained in the paper container, causing the fillings to have unpleasant taste and odor. Not only is the cause of the occurrence of, but also because the polyolefin-based resin layer as the inner peripheral surface layer of the paper container is easy to adsorb and permeate the flavor components in the orange juice and the like as the filling, It has the disadvantage that the flavor of the filling is easily damaged.

For this reason, as a paper container having excellent properties of retaining the flavor component, the inner peripheral surface layer of the paper container has a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher or an ethylene-containing layer.
A paper container composed of a vinyl alcohol-based copolymer resin layer has been studied.

Thus, for a paper container having the performance of retaining the flavor component, a linear saturated polyester resin or an ethylene-vinyl alcohol copolymer resin having thermal adhesion suitability between the paper container and the inner peripheral surface layer of the paper container. When an attempt was made to apply a pouring device made of an integrally molded article, the former pouring device using a linear saturated polyester resin had high rigidity of a linear saturated polyester resin as a raw material for molding, and cracks occurred in a thin portion, Furthermore, in the case of a dispensing tool having a pull ring, it has drawbacks such that it is impossible to form an opening by the pull ring, and the latter dispensing tool made of an ethylene-vinyl alcohol copolymer resin is molded. Ethylene as raw material
The crystallization speed of vinyl alcohol copolymer resin is fast,
This is accompanied by the same adverse effects as in the case of the pouring tool made of the linear saturated polyester resin.

In contrast, each of the first and second invention methods has excellent flavor characteristics, does not cause cracking in the thin portion of the pouring tool, and has a pull ring. In the case of a dispensing device, a polyolefin resin dispensing device having an action such as smooth formation of an opening by a pull ring is firmly attached to the inner peripheral surface layer of the paper container.
An object of the present invention is to provide a method for attaching the polyolefin-based resin pouring tool when a integrally fixed paper container is formed.

[Means for solving the problem]

The mounting method of the spouting tool according to the present invention, the opening of the cylindrical body obtained by forming a body pasting portion by a paper container blank plate formed by punching the paper container laminated sheet into a predetermined outer shape. Inserting a separate polyolefin resin pouring tool from the inside of the cylindrical body, welding the flange portion of the pouring tool to the inner peripheral surface of the cylindrical body, and fixing the pouring tool. The bottom of the container is formed with respect to the cylindrical body, and the top of the container is formed after the filling operation of the filling material, so that a paper container such as a gobel top type or a brick type as a final molded body is obtained. Things.

The method for mounting the spouting tool when the paper container of the first invention is formed is as follows: a surface layer made of a polyolefin resin, an intermediate layer containing a gas barrier layer and a paper layer in a laminated structure, and a glass transition temperature. It has a blank plate for a paper container with a laminated sheet for a paper container having a back layer made of a linear saturated polyester resin at 40 ° C. or higher, a surface layer made of a linear saturated polyester resin, and a back layer made of a polyolefin resin. An interposed member made of a laminated sheet and having an easy-to-break line formed at a position corresponding to the contour of the opening in the blank plate is used.

In the first step of the first invention method, a laminated sheet for a paper container is punched into a blank plate having a predetermined outer shape having a substantially rectangular shape, and an opening for inserting a pouring tool through the blank plate is formed. The purpose of the present invention is to obtain a blank plate for a paper container having an opening through which a pouring tool is inserted.

In the subsequent second step, for the linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more, which is the back layer of the blank plate for the paper container obtained in the first step,
A linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more as a surface layer of the interposition member so as to close an opening formed in the blank plate, and a back surface layer of the laminated sheet for a paper container. And at the portion along the periphery of the opening in the blank plate, by the welding ability between the back layer of the blank plate and the surface layer of the interposition member, The member is bonded and fixed to the back surface layer of the blank plate.

Further, in the third step, the portion of the interposition member fixed to the blank plate, which is surrounded by the easy-break line, is removed by using the easy-break line formed on the interposition member. A blank plate in which an interposition member having a shape substantially coinciding with a flange portion of a polyolefin-based resin pouring tool used in a subsequent process is obtained only in a portion along a peripheral portion of an opening in the blank plate. It is.

In the fourth step, a pair of opposite sides of the blank plate for the paper container obtained in the third step, that is, the blank plate in which the interposition member is fixed only to a portion along the periphery of the opening. By bonding the parts, a cylindrical body whose inner peripheral surface layer is constituted by the back surface layer of the laminated sheet for a paper container is obtained.

In a fifth step of the final step, a polyolefin-based resin pouring tool having a flange portion is inserted into the opening from inside the cylindrical body obtained in the fourth step, and a flange portion of the pouring tool is inserted. Is welded and fixed to the interposed member of the cylindrical body to obtain a cylindrical body to which the pouring tool is welded and fixed.

Further, the method for attaching the spouting tool when the paper container of the second invention is formed includes a step of forming a surface layer made of a polyolefin resin, an intermediate layer containing a gas barrier layer and a paper layer in a laminated structure, A blank sheet for a paper container with a laminated sheet for a paper container having a back layer with a vinyl alcohol copolymer resin, a surface layer with an ethylene-vinyl alcohol copolymer resin, and a back layer with a polyolefin resin. An interposed member made of a laminated sheet provided and having an easy-to-break line formed at a position corresponding to the contour of the opening in the blank plate.

In the first step of the second invention method, the laminated sheet for a paper container is punched into a blank plate having a predetermined outer shape in a substantially rectangular shape, and an opening for inserting a pouring tool through the blank plate is formed. The purpose of the present invention is to obtain a blank plate for a paper container having an opening through which a pouring tool is inserted.

In the subsequent second step, the interposed member is formed on the blank plate with respect to the ethylene-vinyl alcohol-based copolymer resin layer, which is the back surface layer of the paper container blank plate obtained in the first step. The opening is closed, and the ethylene-vinyl alcohol-based copolymer resin layer, which is the surface layer of the interposed member, is brought into contact with the back layer of the paper container laminated sheet, and Bonding the interposition member to the back surface layer of the blank plate by a welding ability between the back surface layer of the blank plate and the surface layer of the interposition member at a portion along the periphery of the opening in the blank plate. , To be fixed.

Further, in the third step, the portion of the interposition member fixed to the blank plate, which is surrounded by the easy-break line, is removed by using the easy-break line formed on the interposition member. A blank plate in which an interposition member having a shape substantially coinciding with a flange portion of a polyolefin-based resin pouring tool used in a subsequent process is obtained only in a portion along a peripheral portion of an opening in the blank plate. It is.

In the fourth step, a pair of opposite sides of the blank plate for the paper container obtained in the third step, that is, the blank plate in which the interposition member is fixed only to a portion along the periphery of the opening. By bonding the parts, a cylindrical body whose inner peripheral surface layer is constituted by the back surface layer of the laminated sheet for a paper container is obtained.

In a fifth step of the final step, a polyolefin-based resin pouring tool having a flange portion is inserted into the opening from inside the cylindrical body obtained in the fourth step, and a flange portion of the pouring tool is inserted. Is welded and fixed to the interposed member of the cylindrical body to obtain a cylindrical body to which the pouring tool is welded and fixed.

In the laminated sheet for a paper container used in the method for attaching a spout according to the first invention, a back layer of the laminated sheet;
That is, since the linear saturated polyester resin layer serving as the inner peripheral surface layer in the obtained paper container exhibits excellent fragrance retention performance at a temperature lower than the glass transition temperature, the filling content in the paper container is reduced. In relation to the fact that it is usually placed in an atmosphere of less than 40 ° C., the back layer is made of a linear saturated polyester resin having a glass transition temperature of 40 ° C. or higher so as to have excellent fragrance retention performance. Things.

Further, the linear saturated polyester resin layer, for example,
When formed from a resin having a low crystallinity such as a crystallinity of 10% or less, the above-described paper container can be heated even when subjected to hot filling of a filling such as orange juice in the obtained paper container. The heat-bonding property of the linear saturated polyester resin layer does not decrease, and excellent bonding strength can be obtained even in the heat-bonding of the sealed portion formed after the filling operation of the filling material by the heat filling. .

The linear saturated polyester resin having a glass transition temperature of 40 ° C. or more constituting the back layer is, for example, ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-
A co-condensation polymer comprising an alcohol component such as cyclohexane dimethanol and a dicarboxylic acid component such as an aliphatic dicarboxylic acid such as adipic acid or sebacic acid, or an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid or diphenyldicarboxylic acid; Specifically, a co-condensation polymer of a combination of ethylene glycol with terephthalic acid, ethylene glycol with isophthalic acid with terephthalic acid, 1,4-cyclohexanedimethanol with ethylene glycol with terephthalic acid, propylene glycol with isophthalic acid with terephthalic acid, etc. It can be formed by utilizing.

In addition, the aliphatic dicarboxylic acid component in the acid component is 10% by weight.
In the case of the above-mentioned co-condensation polymer, a saturated polyester resin layer made of the co-condensation polymer is not preferable because its fragrance retention performance tends to decrease.

Further, the linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more has poor stability when the thickness of the layer is less than 3 μm, and hardens when the thickness exceeds 60 μm. It is preferable that the resin layer has a thickness in the range of 3 to 60 μm because the container forming characteristics of the laminated sheet are deteriorated.

The polyolefin-based resin layer constituting the surface layer of the laminated sheet for a paper container serves as an outer peripheral surface layer of the obtained paper container, and imparts water resistance from the outside to the paper container. And exhibits excellent heat welding properties between the layer and the saturated polyester resin layer.

This polyolefin-based resin layer includes, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene,
It is formed to a thickness of about 3 to 150 μ with an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-methyl acrylate copolymer, an ethylene-α-olefin copolymer, and a polypropylene. Is what it is.

Also, an intermediate sheet composed of a paper composite base material layer formed by laminating, for example, an aluminum foil, a paper layer, an olefin-based resin layer, a polyester stretched film layer, etc., between the front surface layer and the back surface layer in the laminated sheet for paper containers. The layer is used, and in particular, by having a stretched resin film layer interposed between the paper layer and the low-crystalline linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher as the back layer, excellent properties in bending can be obtained. It can be used as a laminated sheet for paper containers.

In order to close the opening for attaching the spouting tool formed at a predetermined position of the blank plate by the laminated sheet for the paper container having the above-mentioned laminated configuration, it is usually formed at the portion configured at the top of the container. In order to close the opening that is, the interposition member welded to the back layer of the blank plate,
As described above, it is composed of a laminated sheet having a surface layer made of a linear saturated polyester resin layer and a back layer made of a polyolefin-based resin layer, and a back layer of the blank plate and a surface layer of an interposition member. In this case, the interposition member is adhered to the peripheral portion of the opening by the welding ability between them.

The surface layer of the interposed member is made of the same saturated polyester resin as the back layer of the laminated sheet for a paper container, and the back layer is made of the same polyolefin resin as the material for forming the pourer. It is preferable, but not limited to.

The laminated sheet as the interposition member is formed to have a thickness of about 5 to 150 μm, the surface layer of the sheet is formed to be about 3 to 60 μm, and the back layer is formed to be about 2 to 90 μm. The mounting member may have a two-layer structure of the surface layer and the back layer, and between the surface layer and the back layer, for example,
It has a biaxially oriented polyethylene terephthalate film, a biaxially oriented nylon film, a biaxially oriented polypropylene film, an aluminum foil, a composite layer of a combination of two or more of these, and a core layer composed of an adhesive polyolefin resin layer and the like. It may have a multilayer configuration of three or more layers.

Incidentally, for forming the adhesive polyolefin resin layer, for example, poly-α-olefins such as polyethylene, ethylene-α-olefin copolymer, polypropylene, polybutene and polyisobutylene, and polydiolefins such as polybutadiene and polyisoprene or these are used. A polyethylene-based polymer consisting of a copolymer or the like,
For example, carbonyl based on carboxylic acid, carboxylate, carboxylic anhydride, carboxylic ester, carboxylic amide or imide, aldehyde, ketone, etc. Alone or a cyano (-C≡N) group: a hydroxy group: an ether group: oxirane One or more of the ethylenically unsaturated monomers having a combination with, for example, A. Ethylenically unsaturated carboxylic acids: acrylic acid, methacrylic acid, maleic acid, fumaric acid,
Crotonic acid, itaconic acid, citraconic acid, 5-norbornene-2,3-dicarboxylic acid, etc. B. ethylenically unsaturated carboxylic anhydride: maleic anhydride, citraconic anhydride, 5-norbornene-2,3-dicarboxylic anhydride , Tetrahydrophthalic anhydride, etc. C. Ethylenically unsaturated esters: ethyl acrylate, methyl methacrylate, 2-ethylhexyl acrylate, mono or diethyl maleate,
Vinyl acetate, vinyl propionate, propyl γ-hydroxymethacrylate, ethyl β-hydroxyacrylate,
Glycidyl acrylate, glycidyl methacrylate,
β-N-ethylaminoethyl acrylate, etc. D. Ethylene unsaturated amide or imide: acrylamide, methacrylamide, maleimide, etc. E. Ethylene unsaturated aldehyde or ketone: Acrolein, methacrolein, vinyl methyl ketone, vinyl butyl ketone, etc. It is a copolymer with an ethylenically unsaturated monomer, and among them, a copolymer with an ethylenically unsaturated carboxylic acid or an ethylenically unsaturated carboxylic anhydride is particularly preferably used.

In the laminated sheet for a paper container used in the method for attaching a spout according to the second invention, a back layer of the laminated sheet;
That is, the ethylene-vinyl alcohol-based copolymer resin to be the inner peripheral surface layer in the obtained paper container is not practical if the ethylene content is less than 40 mol% because the temperature required for heat sealing becomes high, and Ethylene content is 60
If the content exceeds mol%, the tendency of the flavor component to be adsorbed in the filling increases, so that the ethylene content is 40 to 60 mol%.
It is preferable to use the ethylene-vinyl alcohol copolymer resin of the above.

When the thickness of the resin layer of the ethylene-vinyl alcohol-based copolymer is less than 5 μm, the stability of the resin layer is reduced, and when the thickness exceeds 40 μm, the impact resistance is reduced. Therefore, it is preferable that the resin layer exists in a range of 5 to 40 μm.

As the surface layer and the intermediate layer in the laminated sheet for a paper container, the same configuration as the surface layer and the intermediate layer of the laminated sheet for a paper container used in the method of the first invention described above is used.

Further, as described above, the interposition member used in the second invention method is a laminate sheet having a surface layer made of an ethylene-vinyl alcohol copolymer resin layer and a back layer made of a polyolefin resin layer. The surface layer is made of the same ethylene-vinyl alcohol copolymer resin as the inner peripheral surface layer of the paper container, and the back layer is made of the same polyolefin resin as the material for molding the pouring tool. It is preferable that each is configured,
It is not necessarily so limited.

The laminated sheet as the interposition member has a thickness of 7 to 150.
μ, and the surface layer in the laminated sheet is 5 to 5 μm.
The back layer is formed to about 60 μm and the back layer is formed to about 2 to 90 μ, and the interposition member may have a two-layer structure of the front surface or the like and the back layer. Between
For example, a biaxially oriented polyethylene terephthalate film, a biaxially oriented nylon film, a biaxially oriented polypropylene film, an aluminum foil, a composite layer formed by a combination of two or more of these, and a core layer composed of an adhesive polyolefin resin layer, etc. And a multi-layered structure having three or more layers.

In each of the first and second invention methods, the interposed member having the above-described configuration has a shape similar to the contour shape of the opening formed in the blank plate for the paper container,
It has a shape having an extended portion of about 3 to 30 mm with respect to the contour shape of the opening, and an easy-break line is formed at a portion corresponding to the contour of the opening. In the extension portion of the interposition member, a flange portion of a separate pouring tool is welded and fixed.

Therefore, in each of the first and second invention methods, the spouting tool attached to the opening of the paper container blank plate has a flange portion, and is formed in a cylindrical shape formed by the paper container blank plate. It is inserted from the inner peripheral surface layer side of the body, and is welded to the flange portion on the back surface layer of the interposition member.

The spout having the flange portion is made of an integrally molded article made of a polyolefin resin, and includes, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, and ethylene-acryl. An acid copolymer, an ethylene-methyl acrylate copolymer, an ethylene-α-olefin copolymer, and a resin molded product of polypropylene or the like are used.

〔Example〕

Hereinafter, a specific configuration of a method for attaching a spouting tool when forming the paper container of the present invention will be described based on examples.

Example 1 Production of Laminated Sheet for Paper Container In FIG. ^2, an acid-resistant paper having a basis weight of 340 g / m ² / an ionomer resin having a thickness of 15 μm “Himilan 1652: manufactured by Mitsui Dupont Polychemical Co., Ltd.” The thickness of the intermediate layer 21 made of a four-layer paper composite base material composed of an aluminum foil / a 12 μm-thick biaxially stretched polyethylene terephthalate film layer is set on the acid-resistant paper surface of the intermediate layer 21 made of the composite base material.
A surface layer 22 of a 30 μm polyolefin resin “Mirason 16p: manufactured by Mitsui Petrochemical Industry Co., Ltd.” is formed, and a 15 μm thick line is formed on the biaxially stretched polyethylene terephthalate film layer surface of the paper composite base material 21. Layered saturated polyester resin "Eastman Kodak Company: PET G 6763, glass transition temperature: 81 ° C" layer / thickness 30μ linear saturated polyester resin "Toyobo Co., Ltd .: Byron GM-990" layer / thickness 15μ
By laminating a back layer 23 of a three-layer co-extruded film comprising a layer of linear saturated polyester resin “PET G 6763”, a laminated sheet for a paper container used in the first invention denoted by reference numeral 20 Example products were obtained.

Manufacture of the interposed member In FIG. 3, the linear saturated polyester resin “PET G 6763” having a thickness of 10 μ / the linear saturated polyester resin “Vylon GM-990” having a thickness of 20 μ / the linear saturated polyester having a thickness of 10 μ A surface layer a made of a three-layer co-pressed film made of a resin “PET G 6763” layer and a core layer c made of a biaxially stretched polyethylene terephthalate film having a thickness of 12 μ are laminated by a dry lamination method. On the layer c surface,
By extruding and coating the back layer b with a 20μ thick polyolefin resin “Miroson 16p”,
After obtaining the laminated sheet for the interposition member, the laminated sheet,
Punching into a 35mm diameter disc and 24mm diameter
And the step of forming the concentric easy-break line d on the laminated sheet were performed at the same time, thereby obtaining an example of the interposed member used in the first invention indicated by the reference numeral e and used in the first invention.

FIG. 3 shows a bottomed cylindrical body composed of a peripheral wall portion A, a bottom wall portion B, and a flange portion C extending outward from the bottom wall portion B. A pouring tool F composed of an integrally formed body D and a detachable cap E for closing the opening end portion of the bottomed cylindrical body D made of the integrally formed body is connected to a polyolefin resin "Sumikasen G701: Sumitomo Chemical Co., Ltd." )).

In addition, the bottomed cylindrical body D has a thin annular groove G for easy breakage in a bottom wall B thereof along a peripheral edge of the bottom wall B, and the thin annular groove G in the bottom wall B. In the portion surrounded by the groove G, a pull ring H integral with the bottom wall portion is formed, respectively. The pull ring H is pulled, whereby the bottom wall portion B becomes a thin annular groove G. According to the above, the flow path in the pouring tool is formed.

In FIG. 5, a step of punching the laminated sheet 20 into a substantially rectangular shape of 300 mm × 300 mm using the above-described laminated sheet 20 for a paper container, An opening having a diameter of 24 mm for inserting a pouring tool into a predetermined portion of the paper container formed by the container blank plate 25 at a predetermined portion of the container top.
And a punching step of forming the same 24, and after obtaining a blank plate for a paper container having an opening 24 for inserting a pouring tool, the interposing member with respect to the back layer 23 of the blank plate. e so that the easy break line d in the interposition member e and the contour edge of the opening 24 coincide with each other.
At 0 ° C., 2.0 kg / cm ² , by pressing under heat and pressure conditions for 1 second, the interposition member e was pressed against the back surface layer 23 of the blank plate.
The blank plate 25 was welded and fixed at a portion along the opening 24.

Next, by breaking the interposition member e from the surface layer a side of the interposition member e in the blank plate 25, that is, from the surface layer 22 side of the blank plate, the breaking line d of the interposition member e is obtained. The surrounding portion was separated and removed to obtain a blank plate in which the interposition member e was laminated only on a portion of the blank plate along the periphery of the opening 24.

Thereafter, a pair of opposing side portions of the blank plate are overlapped with each other, and a body bonding portion is formed by applying heat and pressure.
3, that is, a rectangular tubular body formed of a linear saturated polyester resin layer was obtained.

Further, the bottomed cylindrical body D of the pouring tool F is inserted from the inner peripheral surface side of the rectangular cylindrical body, and the amplitude is 1.5 KW.
Under the ultrasonic sealing condition of 4.0 kg / cm ² .0.8 seconds, the flange portion C of the bottomed cylindrical body D is fixed to the back surface layer b of the interposition member e, and is indicated by reference numeral 1 in FIG. A rectangular cylinder for a paper container to which the dispensing tool F was attached was obtained.

Comparative Example 1 A blank sheet made of a laminated sheet for a paper container having the same lamination structure as the laminated sheet for a paper container used in the above-mentioned Example 1 was obtained without applying any interposing member to the blank sheet.
A pouring device having the same configuration as that used in Example 1 was used in Example 1 described above.
By fixing under the same conditions as the welding conditions, a rectangular cylinder provided with a pouring tool for comparison was obtained.

Example 2 Production of laminated sheet for paper container Acid-resistant paper having a basis weight of 340 g / m ² / ionomer resin having a thickness of 15 μm “Himilan 1652: Du Pont-Mitsui Polychemical Co., Ltd.
The acid-resistant paper surface of the intermediate layer composed of the composite substrate with respect to the intermediate layer composed of a four-layer paper composite substrate composed of a “made” layer / aluminum foil having a thickness of 9μ / a biaxially stretched polyethylene terephthalate film layer having a thickness of 12μ Then, a surface layer 22 of a 30 μm thick polyolefin-based resin “Mirason 16p: manufactured by Mitsui Petrochemical Industry Co., Ltd.” is formed, and the biaxially stretched polyethylene terephthalate film layer of the paper composite base material is coated with an inflation method. Ethylene-vinyl alcohol-based copolymer resin “ethylene content 47 mol%, EVAL G: Kuraray Co., Ltd.” layer (10 μ) / adhesive polyolefin-based resin “Novatec AP 220 L: Mitsubishi Chemical Co., Ltd. ) "Layer (1
0μ) / ethylene-α-olefin resin “Ultzex 2020 L: Mitsui Petrochemical Industries” layer (40μ) co-extruded laminated resin film with the ethylene-α-olefin resin layer in the laminated resin film, By laminating the biaxially stretched polyethylene terephthalate film layer so as to be in contact therewith, an example of the laminated sheet for a paper container used in the second invention was obtained.

Manufacture of interposed members Ethylene-vinyl alcohol copolymer resin "ethylene content 47% mol%, EVAL G: Kuraray Co., Ltd."
μ) / Straight-through polyolefin resin “Novatec AP 220
L: Mitsubishi Kasei Co., Ltd. layer (10μ) / ethylene-α-olefin resin “Ultzex 2020 L: Mitsui Petrochemical Industry” layer (40μ) After obtaining the laminated sheet, a step of punching the laminated sheet into a disk having a diameter of 35 mm,
The step of forming a 24 mm concentric easy-break line on the laminated sheet was performed at the same time to obtain an example of the interposed member used in the second invention.

Molding of the pouring tool The same pouring tool as the pouring tool used in Example 1 was prepared.

Attachment step of the pouring tool The laminated sheet for the paper container, the interposition member, and the pouring tool, using the same procedure as that described in the first embodiment, the back layer of the blank plate, ethylene intervention member - the welding between the vinyl alcohol copolymer resin layer, done in hot pressing conditions of 240 ℃ .2.0kg / cm ² .1.0 seconds, also the back surface layer serving as ethylene intervention member - and alpha · olefin resin layer, the welding between the flange portion of Note Daegu, by performing the ultrasonic sealing conditions amplitude 1.5KW. pressure 4.0kg / cm ² .0.8 seconds, and note Daegu F is attached Rectangular container for a paper container.

Comparative Example 2 A blank sheet made of a laminated sheet for a paper container having the same lamination structure as the laminated sheet for a paper container used in the above-described Example 2 was prepared without using an interposition member.
A pouring device having the same configuration as that used in Example 2 was used in Example 2 described above.
By fixing under the same conditions as the welding conditions, a rectangular cylinder provided with a pouring tool for comparison was obtained.

[Observation]

As a result of observing the state of the bonding part between the spouting tool and the blank plate for the paper container in the square cylinder having the spouting tool obtained in each of the above Examples and Comparative Examples, the square cylinders of Examples 1 and 2 were observed. In the body, the spout was adhered to the blank plate for the paper container with a sufficient adhesive force necessary for the paper container.
In, the adhesive portion between the dispensing tool and the back layer of the rectangular cylinder for a paper container was easily peeled off.

[Action and Effect of the Invention]

The method for mounting the spouting tool when the paper container of the first invention is formed is as follows: a surface layer made of a polyolefin resin, an intermediate layer containing a gas barrier layer and a paper layer in a laminated structure, and a glass transition temperature. A surface layer made of a linear saturated polyester resin, a polyolefin-based material, and an opening formed in a paper container blank plate made of a paper container laminated sheet having a back surface layer made of a linear saturated polyester resin having a temperature of 40 ° C or higher. An interposed member comprising a laminated sheet having a back surface layer made of resin and having an easy-to-break line formed at a position corresponding to the contour of the opening in the blank plate, the surface layer of the interposed member and the paper The back layer of the blank sheet is brought into contact with the back layer of the container laminate sheet, and the back layer of the blank sheet and the interposition are provided at a portion along the periphery of the opening in the blank sheet. A step of bonding and fixing the interposed member to the back surface layer of the blank plate by a welding ability between the interposed member and the surface layer of the blank, and utilizing a line of easy breaking in the interposed member fixed to the blank plate. Removing the interposition member of the portion surrounded by the easy break line, obtaining a blank plate in which the interposition member is laminated only in a portion along the peripheral edge of the opening in the blank plate, Forming a container body with the blank plate to which the interposition member is fixed, thereby obtaining a cylindrical body whose inner peripheral surface layer is constituted by a back surface layer of the paper container laminated sheet; and From the inside of the body, insert a pouring tool made of polyolefin resin having a flange portion into the opening,
Welding and fixing the flange portion of the pouring tool to the interposed member of the tubular body.

Further, the method for attaching the spouting tool when the paper container of the second invention is formed includes a step of forming a surface layer made of a polyolefin resin, an intermediate layer containing a gas barrier layer and a paper layer in a laminated structure, An opening formed in a blank plate for a paper container made of a laminated sheet for a paper container having a back layer made of a vinyl alcohol-based copolymer resin, a surface layer of an ethylene-vinyl alcohol-based copolymer resin, An interposed member comprising a laminated sheet having a back layer made of a polyolefin-based resin and an easy-break line formed at a position corresponding to the contour of the opening in the blank plate,
The surface layer of the interposed member and the back layer of the laminated sheet for paper containers are brought into contact with each other so that the back layer is in contact with the back layer of the blank plate. A step of adhering and fixing the interposed member to the back surface layer of the blank plate by a welding ability between the interposed member and a surface layer of the interposed member, and using an easily breakable line in the interposed member fixed to the blank plate. Removing the intervening member at a portion surrounded by the easy breaking line to obtain a blank plate in which the interposed member is laminated only at a portion along the peripheral edge of the opening in the blank plate. By forming a container body by the blank plate to which the interposition member is fixed, a cylindrical body whose inner peripheral surface layer is constituted by the back surface layer of the laminated sheet for paper containers. And that step, from the interior of the tubular body,
Inserting a pouring tool made of a polyolefin resin having a flange portion into the opening, and welding and fixing the flange portion of the pouring tool to an interposition member in the tubular body.

Thus, in the method for attaching a spout for forming a paper container according to the present invention, the inner peripheral surface layer of the cylindrical body obtained by the method of the present invention has a glass transition temperature. Since a paper container composed of a linear saturated polyester resin layer or an ethylene-vinyl alcohol-based copolymer resin layer at a temperature of 40 ° C. or higher can be obtained, the inside of the paper container by the resin layer forming the container inner peripheral layer is obtained. Since there is no permeation and adsorption of the flavor components contained in the filling, and no elution of low molecular weight generation from the resin layer forming the inner peripheral layer of the container into the filling.
Without losing the taste of the filling in the paper container,
That is, a paper container having quality retention characteristics over a long period of time is formed without lowering the quality of the filling.

Further, in each of the methods of the present invention, an interposition member having welding suitability to both the blank plate and the polyolefin-based resin pouring device is bonded to the blank plate to which the pouring device is attached along the periphery of the opening. Since the pouring tool made of polyolefin resin is fixed to the interposition member, the pouring tool can be stably mounted.

Further, in each of the methods of the present invention, the interposition member having the easy-break line is bonded to the paper container blank plate, that is, the interposition member without the portion corresponding to the opening is punched in advance. Since the interposed member is bonded, the interposed member is not distorted in the handling step at the time of bonding the interposed member, so that the interposed member is fixed to the blank plate in an orderly state. What you get.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part model of a rectangular cylinder obtained by a method of attaching a spouting tool when molding a paper container according to the first invention, and FIG. FIG. 3 is a cross-sectional view of a model of one embodiment of a paper container laminated sheet used in the method of attaching a spout in forming the paper container of the first invention. FIG. 3 shows the paper container of the first invention. FIG. 4 is a cross-sectional view of a model of an embodiment of an interposition member used in a method of attaching a spouting tool during molding. FIG. 4 is a cross-sectional view of a model of an embodiment of a spouting tool used in the method of the present invention. 5
The figure is a model cross-sectional view showing a state where an interposition member is fixed to a blank plate for a paper container. 1: square tube body to which spout F is attached, 20: laminated sheet for paper container, 21: intermediate layer in laminated sheet for paper container, 2
2: surface layer in the paper container laminated sheet, 23: back surface layer in the paper container laminated sheet, 24: opening in the paper container blank plate 25 obtained by the paper container laminated sheet 20, d: interposition member e, an easy breaking line, e: interposed member, a: surface layer of interposed member, b: rear surface layer of interposed member, F: pouring tool, C: flange portion of pouring tool F.

Claims (2)

(57) [Claims] 1. A surface layer made of a polyolefin resin, an intermediate layer containing a gas barrier layer and a paper layer in a laminated structure,
The glass layer has a back surface layer of a linear saturated polyester resin having a temperature of 40 ° C. or higher. And a laminated sheet comprising a back layer made of a polyolefin resin,
An interposed member in which an easy-break line is formed at a position corresponding to the contour of the opening in the blank plate, such that the surface layer of the interposed member and the back layer of the laminated sheet for paper containers are in contact with each other. At the same time, at the portion along the periphery of the opening in the blank plate, by the welding ability between the back layer and the surface layer of the interposition member in the blank plate, the interposition member is Glued to the back layer,
The step of fixing and removing the portion surrounded by the easy-break line in the interposition member fixed to the blank plate by using the easy-break line to remove the peripheral portion of the opening in the blank plate. A step of obtaining a blank plate in which the interposing member is laminated only along the portion, and forming a container body by the blank plate to which the interposing member is fixed, so that the inner peripheral surface layer is formed of the paper. A step of obtaining a cylindrical body composed of a back surface layer in the container laminated sheet, and inserting a polyolefin-based resin pouring tool provided with a flange portion from the inside of the cylindrical body into the opening; Welding the flange portion of the dispensing tool to the interposed member of the tubular body and fixing the same to the insertion member when the paper container is formed. 2. A surface layer made of a polyolefin resin, an intermediate layer containing a gas barrier layer and a paper layer in a laminated structure,
An opening formed in a paper container blank plate made of a paper container laminated sheet having a back surface layer made of an ethylene-vinyl alcohol copolymer resin is provided with a surface layer made of an ethylene-vinyl alcohol copolymer resin. And a back sheet made of a polyolefin-based resin, the interposed member having an easy-to-break line formed at a position corresponding to the contour of the opening in the blank plate. The layer is brought into contact with the back layer of the laminated sheet for a paper container so that the back layer is in contact with the back layer, and the back layer of the blank plate and the surface layer of the interposed member are provided along the periphery of the opening in the blank plate. Bonding and fixing the interposed member to the back surface layer of the blank plate by the welding capability between the interposed member and the interposed member fixed to the blank plate. A blank plate in which the interposed member is laminated only on a portion of the blank plate along a peripheral portion of an opening by removing a portion surrounded by the easy-break line using the easy-break line. And forming a container body by the blank plate to which the interposition member is fixed, thereby forming a cylindrical body whose inner peripheral surface layer is constituted by a back surface layer of the paper container laminated sheet. Obtaining, inserting a polyolefin-based resin pouring tool having a flange portion from the inside of the tubular body into the opening, welding the flange portion of the pouring tool to an interposition member in the tubular body, A method for attaching a spouting tool when molding a paper container, comprising: fixing the paper container.