JPH0646822Y2 - Paper container with spout - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an improvement of a paper container provided with a spout.

[Conventional technology]

Conventionally, a spout is inserted from the inside of the paper container into an opening formed in the paper container, and a flange of the spout is adhered and fixed to an inner surface layer of the paper container to fill a beverage or the like. Is used for.

This paper container is a laminated material whose surface layer is formed of a polyolefin resin layer, and is formed into a container whose inner surface layer is formed of a polyolefin resin layer,
The flange portion of the spout is adhered to the paper container by utilizing the thermal adhesiveness of the polyolefin resin.

In addition, the opening at the center of the flange portion of the spouting device is shielded by a sealing piece that is continuous with the flange portion via an annular groove for breaking.

[Problems to be solved by the device]

By the way, a paper container using a laminated material in which the conventional inner surface layer is composed of a polyolefin-based resin layer is used for forming the polyolefin-based resin layer when obtaining the laminated material or for forming a paper container with the laminated material. At times, the polyolefin resin undergoes thermal decomposition to generate volatile components such as aliphatic hydrocarbons, and as a result of the volatile components migrating into the inner filler contained in the paper container, Not only does it have the adverse effect of causing a change in taste or an offensive odor, but the polyolefin-based resin layer in the above-mentioned laminated material is likely to adsorb or permeate the flavoring component in the filling material. It also has the drawback that the flavor of the product changes and is easily impaired.

Further, when the above-mentioned spout is adhered by the thermal adhesiveness of the polyolefin resin layer which is the inner surface layer of the paper container, the same adverse effect as in the molding of the paper container and the like occurs.

In addition, since there is an annular groove for breaking between the sealing piece and the flange portion of the spout, the resin layer becomes small at that groove, and the gas barrier property deteriorates. There is a problem that it penetrates into the paper container through a small portion and reduces the freshness when the filling is a drink.

Therefore, the present invention aims to solve such conventional drawbacks, and an object of the present invention is to provide a paper container provided with a spout which does not adversely affect the flavor of the filling material.

[Means for Solving the Problems]

In the paper container of the first invention, a spout is inserted from the inside of the paper container into an opening formed in the paper container, and a flange portion of the spout is thermally bonded to an inner peripheral surface layer of the paper container. And the opening at the center of the flange is shielded by a sealing piece continuous to the flange via an annular groove for breaking, and the flange and the sealing piece have a protective material having a gas barrier property. It consists of heat-bonded components.

The paper container is an inner surface layer composed of a low crystalline linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, an intermediate layer composed of a paper decoding base material layer containing a film layer having gas barrier properties, and a polyolefin. A laminated sheet for a paper container having a laminated constitution with an outer surface layer made of a resin system layer is formed such that the inner surface layer of the laminated sheet becomes an inner peripheral surface layer of the paper container.

Since the linear saturated polyester resin layer forming the inner surface layer of the paper container exhibits excellent aroma preservation performance at a temperature lower than the glass transition temperature of the polyester resin forming the polyester resin layer. In addition, in relation to the fact that the inner filler in the paper container is usually placed in an atmosphere of less than 40 ° C., the glass transition temperature is set to 40% so that the inner surface layer exhibits excellent aroma retaining performance. It is composed of a linear saturated polyester resin having a temperature of ℃ or higher.

Further, since the linear saturated polyester resin layer is formed of a resin having a low crystallinity of, for example, a crystallinity of 10% or less, for example, an internal filler such as orange juice for a paper container. Even if it is subjected to heating such as when the filling is carried out by hot filling, the heat adhesive property of the polyester resin layer is not impaired, and the heat adhesive part of the sealing part formed after filling the inner filler is excellent. It is possible to obtain excellent adhesive strength.

The linear saturated polyester resin having a glass transition temperature of 40 ° C. or higher which constitutes the inner surface layer is, for example, ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-
A co-condensation polymer comprising an alcohol component such as cyclohexanedimethanol and an aliphatic dicarboxylic acid such as adipic acid or sebacic acid or a dicarboxylic acid component such as an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, diphenyldicarboxylic acid, etc. For example, ethylene glycol and terephthalic acid, ethylene glycol and isophthalic acid and terephthalic acid, 1,4-cyclohexanedimethanol and ethylene glycol and terephthalic acid, propylene glycol and isophthalic acid and terephthalic acid are used as co-condensates. Can be formed.

Incidentally, in the case of a co-condensation polymer in which the aliphatic dicarboxylic acid component in the acid component is 10% by weight or more, the saturated polyester resin layer formed by the co-condensation polymer has a tendency that its aroma retention performance is deteriorated. Is not preferable.

In addition, the linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more has poor stability when the layer thickness is less than 3 μ, and the laminated resin layer becomes hard when the layer thickness exceeds 60 μ. Since the container forming characteristics of the paper container blank are deteriorated, the resin layer has a thickness of 3 to 60.
It is preferably in the range of μ.

The outer surface layer of the paper container, at the same time as adding water resistance from the outside to the paper container, at the same time with the heat-sealing resin layer laminated on the back surface layer of the blank for each paper container, A polyolefin resin layer is preferably used because it provides excellent heat welding performance.

This polyolefin resin layer is, for example, low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-α. It can be composed of an olefin copolymer, and further, formed of polypropylene or the like in a thickness of about 3 to 150 μm.

The layer existing between the inner surface layer and the outer surface layer in the paper container is not limited to a single layer composed of a paper layer, and for example, an aluminum foil, a paper layer, an olefin resin layer, a polyester stretched film layer, etc. Can be used as a paper decoding base material layer formed by stacking, and in particular, a resin is stretched between the paper layer and the low-crystalline linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more, which is the inner surface layer of the paper container. By interposing the film layer, it is possible to obtain a paper container having excellent properties for bending.

The form of the paper container may be various types such as a gobel top type and a brick type.

The spout can be fixed to a predetermined position on the paper container.

The spout may be molded entirely with a linear saturated polyester resin having a glass transition temperature of 40 ° C. or higher, and the flange portion and the sealing piece in contact with the inner surface layer of the paper container may have a glass transition temperature of 40 ° C.
It is also possible to mold with a linear saturated polyester resin having a temperature of ℃ or higher.

The linear saturated polyester resin used in the molding of the spout can be the same resin as that of the inner surface layer of the paper container, but is not necessarily limited to a low crystalline one. Absent.

The protective material, which is heat-bonded to the inner surface side of the flange portion and the sealing piece of the spout, is a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, an adhesive polyolefin resin layer or an adhesive polyester resin layer. Selected from the group consisting of an outer layer, an unstretched polyester resin layer having a glass transition temperature of 40 ° C. or higher, a polyacrylonitrile resin layer, an ethylene-vinyl alcohol copolymer resin layer, an unstretched nylon resin film layer, and a polycarbonate resin layer. It has a laminated structure of an inner layer consisting of another resin layer and a core layer containing a film layer having gas barrier properties, and the outer layer of the protective material is in contact with the flange portion and the sealing piece of the spout. In this manner, the flange portion and the sealing piece are heat-bonded to each other.

As the linear saturated polyester resin having a glass transition temperature of 40 ° C. or higher, which constitutes the outer layer of the protective material, it is preferable to use the same resin as the resin constituting the inner surface layer of the paper container. Examples of the adhesive polyolefin resin forming the outer layer of the protective material include polyethylene, ethylene-α-olefin copolymers, polypropylene, polybutene, polyα-olefins such as polyisobutylene, and polybutanediene, polyisoprene. Such as a polydiolefin or a polyethylene-based polymer composed of a copolymer thereof, and a carbonyl based on, for example, carboxylic acid, carboxylic acid salt, carboxylic acid anhydride, carboxylic acid ester, carboxylic acid amide or imide, aldehyde, ketone, etc. Group alone or cyano (-C≡N) group: hydroxy group: ether group: oxirane One or more ethylenically unsaturated monomers having a combination with a ring or the like, specifically, A. Ethylenically unsaturated carboxylic acid: 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 acid anhydrides: maleic anhydride, citraconic acid anhydride, 5-norbornene-2,3-dicarboxylic acid anhydride, tetrahydro C. Ethylenic unsaturated esters such as phthalic anhydride: ethyl acrylate, methyl methacrylate, acrylic acid 2
-Ethylhexyl, mono- or diethyl maleate, vinyl acetate, vinyl bromionate, γ-hydroxymethacrylate propyl, β-hydroxyacrylate, glycidyl acrylate, glycidyl methacrylate, β
-N-ethylaminoethyl acrylate, etc. D. Ethylenically unsaturated amide or imide: Acrylamide, methacrylamide, maleimide, etc. E. Ethylenically unsaturated aldehyde or ketone: Acrolein, methacrolein, vinyl methyl ketone,
It is a copolymer with an ethylenically unsaturated monomer such as vinyl butyl ketone, and among them, a copolymer with an ethylenically unsaturated carboxylic acid or an ethylenically unsaturated carboxylic acid anhydride is particularly preferably used.

Further, the adhesive polyester resin forming the outer layer of the protective material contains ethylene glycol and terephthalic acid as main components, and if necessary, further, a polyhydric alcohol, a long chain glycol, isophthalic acid, an aliphatic dicarboxylic acid, Tensile Modulus of Copolymers Using Aromatic Dicarboxylic Acids
A saturated polyester resin of 10,000 kg / cm ² or less is used. An ethylene vinyl alcohol-based copolymer resin layer, a vinylidene chloride resin layer, or an aluminum foil layer is particularly preferably used as the gas barrier film layer contained in the protective core layer.

The outer layer of the protective material has a thickness of 3 to 30 μ, and the core layer has a thickness of 3 to 30 μm.
30μ, the length of the inner layer is preferably about 3 ~ 30μ,
Further, it is desirable that the thickness of the entire protective material is 10 to 100 µ.

In the second invention, a spout is inserted from the inside of the paper container into an opening formed in the paper container, and a flange portion of the spout is thermally bonded to an inner peripheral surface layer of the paper container. Moreover, the opening at the center of the flange portion is shielded by a sealing piece continuous to the flange portion through an annular groove for breaking, and the flange portion and the sealing piece are heat-bonded with a protective material having a gas barrier property. It is composed of

The paper container is an inner surface layer made of an ethylene-vinyl alcohol copolymer resin layer, an intermediate layer made of a paper composite substrate layer containing a film layer having gas barrier properties, and an outer surface layer made of a polyolefin resin layer. And the inner surface layer of the outer laminated sheet is formed as the inner peripheral surface layer of the paper container.

The ethylene-vinyl alcohol copolymer resin constituting the inner surface layer of the paper container is not practical because the temperature required for heat sealing becomes high when the ethylene content is less than 40 mol%, and the ethylene If the content exceeds 60 mol%, the adsorption tendency of the flavoring component in the internal filler becomes high, so it is recommended to use an ethylene-vinyl alcohol copolymer resin having an ethylene content of 40 to 60 mol%. Is preferred.

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

As the resin used as the outer surface layer of the paper container, it is preferable to use the same polyolefin resin layer as in the first invention.

The layer interposed between the inner surface layer and the outer surface layer of the paper container can be the same paper composite base material layer as in the first invention.

The form of the paper container and the mounting position of the spout can be set in the same manner as in the first invention.

The spout may be entirely molded with an ethylene-vinyl alcohol-based copolymer resin, or the flange portion and the sealing piece in contact with the inner surface layer of the paper container may be molded with an ethylene-vinyl alcohol-based copolymer resin. You can also

The protective material heat-bonded to the inner surface side of the flange and the sealing piece of the spout is an outer layer consisting of an ethylene-vinyl alcohol copolymer resin layer or an adhesive polyolefin resin layer, and a glass transition temperature of 40 ° C. Unstretched polyester resin layer, polyacrylonitrile resin layer, ethylene-
An inner layer comprising one resin layer selected from the group consisting of a vinyl alcohol copolymer resin layer, an unstretched nylon resin film layer and a polycarbonate resin layer, and a core layer containing a film layer having gas barrier properties. The laminated layer of the protective material is heat-bonded to the flange portion and the sealing piece so that the outer layer of the protective material contacts the flange portion and the sealing piece of the spout.

The ethylene-vinyl alcohol-based copolymer resin layer forming the outer layer of the protective material is preferably the same resin as the inner surface layer of the paper container.

Further, as the adhesive polyolefin resin layer forming the outer layer of the protective material, it is desirable to use the same resin as in the first invention.

As the film layer having a gas barrier property included in the protective core layer, the same film layer as the protective core layer in the first invention can be used.

In addition, the total thickness of the protective material and the thickness of each layer may be
The same can be set as in the invention.

〔Example〕

 Examples will be described with reference to the drawings.

Example 1 As shown in FIG. 2, the paper container is constructed in this case in the form of a Gobel top, and the roof-shaped slanted wall portion 1 at the top thereof has a circular opening as shown in FIG. 2 is bored, and the pouring tool 3 is inserted and fixed therein from the inside of the paper container.

The spout 3 includes a tubular portion 4 and a flange portion 5 located at one end of the tubular portion 4, and the flange portion 5 is fixed to the paper container by being bonded to the inner peripheral surface of the paper container.

The paper container is assembled by bending a sheet-shaped laminated material in a usual procedure, and the laminated material has a layer structure as shown in FIG.

That is, the laminated material is acid-resistant paper having a basis weight of 400 g / m ² / ionomer resin “Himilan 1652: DuPont Mitsui Polychemicals Co., Ltd.” having a thickness of 15 μm.
Product ”/ aluminum foil with a thickness of 9μ / a biaxially stretched polyethylene terephthalate film layer with a thickness of 12μ, and a thickness of 30μ on the acid-resistant paper surface of the paper-composite substrate 6 Polyolefin resin "Mirason
16P: Mitsui Petrochemical Industry Co., Ltd. ”outer surface layer 8
And a 30 μm thick ethylene-α-olefin copolymer resin “Ultzex 20” on the biaxially stretched polyethylene terephthalate film layer surface of the paper composite substrate 6.
20L: Mitsui Petrochemical Co., Ltd. layer / 10μ thick adhesive polyolefin resin “Admar AT469C: Mitsui Petrochemical Co., Ltd.” layer / 20μ linear saturated polyester resin “PET G 6763: A glass transition temperature of 81 ° C., manufactured by Eastman Kodak Co., Ltd. ”, a three-layer coextrusion film is laminated so that the polyester resin layer serves as the inner surface layer 7.

On the other hand, the spout 3 is integrally formed by using a linear saturated polyester resin having a glass transition temperature of 40 ° C. or higher (Mitsui Pet Resin Co., Ltd., glass transition temperature 76 ° C., PET J-125).

The pipe 4 of the spout 3 is sealed with a sealing piece 9. The sealing piece 9 is also made of the same resin as the other parts, and an annular groove 10 for breaking is provided at the boundary with the tubular portion 4, and the ring pull 11 connected to the sealing piece 9 is pulled to seal. The piece 9 is designed to be broken and removed at the annular groove 10. In this case, the diameter of the flange portion 5 is 32.
mmφ, and the ring diameter of the annular groove 10 is 15 mmφ.

A protective material 12 is adhered to the inner surfaces of the flange 5 and the sealing piece 9 of the pouring tool 3 by thermal adhesion.

The protective material 12 is a laminated sheet consisting of an unstretched polyester resin film layer having a thickness of 30 μ as an outer layer / an aluminum foil having a thickness of 20 μ as a core layer 14 / an unstretched polyester resin film layer having a thickness of 30 μ as an inner layer 15. , A disk with a diameter of 30 mmφ, which was punched and formed.

The protective material for the flange portion 5 and the sealing piece 9 of the spouting tool.
Thermal bonding of 12 is performed as follows.

That is, first, the protective material 12 is fixed in a molding die (not shown) of the pouring tool 3, and the outer layer 13 of the protective material 12 is exposed to the capital side of the molding die. Molten resin for constituting is injected into a molding die. As a result, the unstretched polyester resin of the outer layer 13 of the protective material 12 is melted by the heat of the molten resin, and the protective material 12 is bonded to the flange portion 5 and the sealing piece 9 of the spout 3.

The tip of the tubular portion 4 of the spout 3 is covered with a cap 16. The cap 16 is formed of low density polyethylene resin (Mirason 16SP manufactured by Mitsui Petrochemical Co., Ltd.).

The spout 3 configured as described above is inserted from the inside of the paper container into the opening 2 of the paper container at the tubular portion 4. Then, the flange portion 5 is pressed against the inner surface layer 7 around the opening portion 2 of the paper container and is fixed by thermal adhesion.

In order to fill the above-mentioned paper container with the filling material, the roof mold in the unsealed state is performed from the top, and after the fixed amount filling, the sealed state as shown in FIG. 2 is obtained. At that time, the spout 3 is already adhered to the paper container.

The opening is performed by pulling the ring pull 11 and removing the sealing piece 9 as described above. In that case, the sealing piece 9 is a protective material.
The protective material 12 may peel off from the sticker 12 and remain on the spouting tool 3 side, but may locally break when the sealing piece 9 is cut off. When it remains on the side of the spout without breaking, the protective material is cut off by using a blade or the like.

Example 2 In this example, the shape of the paper container appears in the same shape as in Example 1, and therefore, for convenience, FIGS.
It will be described with reference to the drawings.

The same components as those in the first embodiment are designated by the same reference numerals, and detailed description will be omitted.

The paper container is assembled by bending the sheet-like laminated material in the same manner as in the first embodiment.

However, unlike the first embodiment, the sheet-shaped laminated material has a laminated structure according to the following procedure. That is, ethylene-
Vinyl alcohol-based copolymer [ethylene content 47 mol%, Eval G: Kuraray Co., Ltd.] layer 7 (10μ) / adhesive polyolefin-based resin [Novatech AP220L: Mitsubishi Kasei Corporation] layer (10μ) / ethylene- An α-olefin copolymer resin [Ultox 2020L: Mitsui Petrochemical Industry Co., Ltd.] A layer (40μ) of three-layer coextrusion laminated resin film was formed by an inflation method, and then the ethylene resin of the laminated resin film was formed. A 12 μm-thick biaxially stretched polyethylene terephthalate film [Toray Industries, Inc .: Lumirror] was adhered to the α / olefin copolymer resin layer surface with an isocyanate adhesive to obtain a laminated resin layer.

On the other hand, the surface of acid-resistant paper with a basis weight of 400 g / m ² was extrusion-coated with a low-density polyethylene resin [Mirason 16SP] layer 8 with a thickness of 20 μ, and on the back surface, an ionomer resin with a thickness of 15 μ [Mitsui DuPont Chemical ( Ltd .: High Milan 1652]
A paper composite substrate 6 was prepared by bonding an Al foil having a thickness of 7 μ using an adhesive layer composed of layers.

Then, the Al foil surface of the paper composite substrate and the biaxially stretched polyethylene terephthalate film surface of the laminated resin layer described above,
It is configured by bonding and laminating with an isocyanate adhesive.

The pouring tool 3 is an injection-molded product made of an ethylene-vinyl alcohol-based copolymer [ethylene content: 47 mol%, Eval G: Kuraray Co., Ltd.].

A protective material 12 is heat-bonded to the inner surface sides of the flange portion 5 and the sealing piece 9 of the pouring tool in the same manner as in the first embodiment.

In this case, the protective material 12 is an unstretched ethylene-vinyl alcohol copolymer film layer / core layer 14 having a thickness of 20 μ which is the outer layer 13.
A laminated sheet consisting of an aluminum foil having a barrel thickness of 20 μ / inner layer 15 and an unstretched ethylene-vinyl alcohol copolymer film layer having a barrel thickness of 20 μ is stamped and formed as a disc having a diameter of 30 mmφ, and the outer layer 13 is a flange portion 5. And sealing piece 9
It is adhered to the pouring tool 3 so as to contact with.

The method for attaching the spouting tool 3 to the paper container and the method for opening the spouting tool 3 are the same as in the first embodiment.

[Function and effect of device]

As described above, since the inner surface layer of the paper container provided with the spout according to the first invention is composed of the low crystalline linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, No odor is generated in the atmosphere below the glass transition temperature.

Further, the spout is formed of a linear saturated polyester resin having a glass transition temperature of 40 ° C. or higher, and is heat-bonded to the inner surface layer of the paper container at the flange portion of the spout, as in the paper container, No offensive odor is generated in the atmosphere below the glass transition temperature.

Therefore, the paper container provided with the pouring device according to the first invention exhibits an extremely excellent aroma retaining property in the atmosphere below the glass transition temperature, and is superior to the conventional paper container equipped with the pouring device. The filler does not cause a change in taste or an offensive odor, and exhibits an excellent aroma retaining property.

In addition, since the inner surface layer of the paper container and at least the flange portion of the spout are made of the same type of resin, the adhesive strength between the two is high, and therefore the paper container can be made to have excellent tightness even at the spout. It is a thing.

Further, on the flange portion of the spout and the inner surface side of the sealing piece, an outer layer composed of a linear saturated polyester resin layer, an adhesive polyolefin resin layer or an adhesive polyester resin layer having a glass transition temperature of 40 ° C or higher, and a glass transition temperature of 40 ° C. Inner layer consisting of one resin layer selected from the group consisting of an unstretched polyester resin layer having a temperature of ℃ or higher, a polyacrylonitrile resin layer, an ethylene-vinyl alcohol copolymer resin layer, an unstretched nylon resin film layer and a polycarbonate resin layer And a protective material having a laminated structure with a core layer containing a film layer having gas barrier properties, such that the outer layer of the protective material contacts the flange portion and the sealing piece of the spout, Since it is heat-bonded to the flange portion and the sealing piece, the thin resin layer in the annular groove portion that defines the sealing piece in the spout is reinforced. Therefore, oxygen and the like in the atmosphere can be suitably prevented from penetrating into the paper container through the thin resin layer, and the freshness of the filling material such as juice can be maintained for a long period of time. Moreover, since the molding resin of the spout and the resin of the outer layer of the protective material are of the same type, the adhesive strength between them is high, and therefore, the annular groove portion of the spout also exhibits excellent sealing performance. .

Next, in the paper container provided with the pouring tool according to the second invention, since the inner surface layer of the paper container is composed of the ethylene-vinyl alcohol-based copolymer layer, the aroma-retaining performance of the resin layer is improved. It has excellent aroma-retaining property for filling materials such as orange juice.

Further, since the spout is formed of an ethylene-vinyl alcohol-based copolymer resin, the portion exposed on the inner peripheral surface of the container is composed of the resin layer, and the portion also corresponds to the filling material. It has excellent aroma-retaining performance.

Therefore, the paper container provided with the pouring tool according to the present invention exhibits extremely excellent aroma-retaining property, and the filling material produces a change or offensive odor as compared with the paper container provided with the conventional pouring device. It has no effect and has an excellent effect on the aroma retention property.

Further, since the inner surface layer of the paper container and at least the flange portion of the spout are made of the same type of resin, the adhesive strength between the two is high, and therefore the action of the spout at the location of the spout is also excellent. .

Further, on the inner surface side of the flange and the sealing piece of the spout, an outer layer consisting of an ethylene-vinyl alcohol copolymer resin layer or an adhesive polyolefin resin layer, and an unstretched polyester resin having a glass transition temperature of 40 ° C. or higher. Layer, a polyacrylonitrile resin layer, an ethylene-vinyl alcohol copolymer resin layer, an unstretched nylon resin film layer, and an inner layer composed of one resin layer selected from the group consisting of polycarbonate resin layers, and a film having gas barrier properties A protective material having a laminated structure with a core layer containing a layer,
Since the outer layer of the protective material is in thermal contact with the flange and the sealing piece of the spout so as to contact the flange and the sealing piece of the spout, the annular groove portion that defines the sealing piece of the spout is thin. It is possible to favorably prevent a gas such as oxygen in the atmosphere from penetrating the resin layer and entering the paper container. Therefore, the freshness of the filling material such as juice can be maintained for a long period of time.

Further, since the spout is made of the same resin as the outer layer of the protective material, the adhesive strength between the two is high, and therefore, the annular groove portion of the spout also exhibits excellent sealing performance.

[Brief description of drawings]

FIG. 1 shows an embodiment of a paper container provided with a dispensing tool according to the present invention, FIG. 1 is a sectional view taken along the line II of FIG. 2, and FIG. 2 is an overall perspective view. 2: Opening part, 3: Dispensing tool, 5: Flange part, 6: Paper composite base material layer,
7: inner surface layer, 9: sealing piece, 10: annular groove, 12: protective material, 13: outer layer, 14: core layer, 15: inner layer.

Claims (2)

[Scope of utility model registration request] 1. A spout is inserted from the inside of the paper container into an opening formed in the paper container, and a flange portion of the spout is heat-bonded to an inner peripheral surface layer of the paper container. In a paper container in which the opening at the center of the flange portion is shielded by a sealing piece that is continuous to the flange portion through an annular groove for breaking, the paper container has a glass transition temperature of 40 ° C. or higher and a low crystalline linear saturation. A laminated sheet for a paper container having a laminated structure of an inner surface layer made of a polyester resin layer, an intermediate layer made of a paper composite base material layer containing a film layer having gas barrier properties, and an outer surface layer made of a polyolefin resin layer. Are formed so that the inner surface layer of the laminated sheet becomes a paper container inner peripheral surface layer, and at least the flange portion and the sealing piece of the pouring tool are linear with a glass transition temperature of 40 ° C. or higher. Saturated polyester It is formed of an integral molded body made of resin, and on the inner surface side of the flange portion and the sealing piece of the spout, a linear saturated polyester resin layer having a glass transition temperature of 40 ° C or higher, an adhesive polyolefin resin layer or an adhesive Layer composed of a flexible polyester resin layer, an unstretched polyester resin layer having a glass transition temperature of 40 ° C. or higher, a polyacrylonitrile resin layer, an ethylene-vinyl alcohol copolymer resin layer,
An inner layer consisting of one resin layer selected from the group consisting of an unstretched nylon resin film layer and a polycarbonate resin layer, and a protective material having a laminated structure of a core layer containing a film layer having gas barrier properties, A paper container provided with a spout, wherein the outer layer of the protective material is heat-bonded to the flange and the sealing piece so as to contact the flange and the sealing piece of the spout. 2. A pour tool is inserted from the inside of the paper container into an opening formed in the paper container, and a flange portion of the pour tool is heat-bonded to an inner peripheral surface layer of the paper container, and A paper container in which an opening at the center of the flange portion is shielded by a sealing piece continuous to the flange portion via an annular groove for breaking, wherein the paper container is an inner surface made of an ethylene-vinyl alcohol copolymer resin layer. Layer, an intermediate layer composed of a paper composite substrate layer containing a film layer having gas barrier properties, and a laminated sheet for a paper container having a laminated structure of an outer surface layer composed of a polyolefin resin layer, the laminated sheet comprising: The inner surface layer is formed so as to be the inner peripheral surface layer of the paper container, and at least the flange portion and the sealing piece of the spout are formed as an integrally formed body of ethylene-vinyl alcohol copolymer resin. Also, on the inner surface side of the flange and the sealing piece of the spout, an outer layer consisting of an ethylene-vinyl alcohol copolymer resin layer or an adhesive polyolefin resin layer, and a glass transition temperature of 40 ° C or higher. An unstretched polyester resin layer, a polyacrylonitrile resin layer, an ethylene-vinyl alcohol-based copolymer resin layer, an unstretched nylon resin film layer and an inner layer consisting of one resin layer selected from the group consisting of polycarbonate resin layers, A protective material having a laminated structure with a core layer containing a film layer having gas barrier properties,
A paper container provided with a spout, wherein an outer layer of the protective material is heat-bonded to the flange and the sealing piece so as to contact the flange and the sealing piece of the spout.