JPH0646820Y2 - Paper container with spout - Google Patents

Description

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

[Prior Art] Conventionally, a paper container in which 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 adhesively fixed to an inner surface layer of the paper container. Is used for filling beverages and the like.

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

[Problems to be Solved by the Invention] By the way, a conventional paper container using a laminated material whose inner surface layer is composed of a polyolefin-based resin layer is used when the polyolefin-based resin layer is formed when the laminated material is obtained. At the time of molding a container with the laminated material or the laminated material, the polyolefin resin is thermally decomposed to generate a volatile component such as an aliphatic hydrocarbon, and the volatile component is contained in the filling material contained in the container. As a result, not only does it have the adverse effect that the internal filler has a change in taste or an offensive odor, but the polyolefin-based resin layer in the above-mentioned laminated material easily adsorbs the flavor component in the internal filler or permeates through it. It also has the drawback that the flavor of the filling material changes and is easily damaged.

Further, when the spout is adhered by the thermal adhesiveness of the polyolefin resin layer which is the inner surface layer of the paper container as described above, the same adverse effect as in the molding of the paper container is caused.

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 Problem] In order to solve the above-mentioned problems, the present invention allows a spout to be inserted from the inside of the paper container into an opening formed in the paper container, and a flange portion of the spout to be attached to the paper container. In the paper container adhered and fixed to the inner surface layer of, the paper container, the inner surface layer in the paper container is composed of a low crystalline linear saturated polyester resin layer having a glass transition temperature of 40 ℃ or more, At least the flange portion of the spout is formed of a linear saturated polyester resin having a glass transition temperature of 40 ° C. or higher, and the flange portion of the spout is fixed to the inner surface layer of the paper container by heat bonding. Has been adopted.

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. , The inner filler in the paper container is usually placed in an atmosphere of less than 40 ° C., so that the inner surface layer has a glass transition temperature of 40 ° C. It is composed of the above linear saturated polyester resin.

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-
An alcohol component such as cyclohexanedimethanol, an aliphatic dicarboxylic acid such as adipic acid and sebacic acid, or a dicarboxylic acid component including an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid and diphenylcarboxylic acid, specifically ethylene. Co-condensation polymers such as glycol and terephthalic acid, ethylene glycol and isophthalic acid and terephthalic acid, 1,4-cyclohexanedimethanol and isophthalic acid and terephthalic acid, propylene glycol and isophthalic acid and terephthalic acid can be used. In the case of a cocondensate in which the content of the aliphatic dicarboxylic acid component is 10% by weight or more, there is a tendency that the aroma retaining performance of the surface layer due to the linear saturated polyester resin having a glass transition temperature of 40 ° C. or more decreases. Is not preferable.

Further, 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 μm.
It is preferable to exist in the range of.

The outer surface layer of the paper container, at the same time that the water resistance is added 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 consisting of a paper layer, and may be, for example, an aluminum foil, a paper layer, an olefin resin layer, a polyester stretched film layer, or the like. It can be a paper composite substrate layer formed by laminating, especially, a resin stretched film 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 layers, it is possible to obtain a paper container having excellent properties for bending.

The form of the paper container can be various types such as a cabel top type and a brick type, and the spout can be fixed to a predetermined position of the paper container.

The spout may be molded entirely of a linear saturated polyester resin having a glass transition temperature of 40 ° C or higher, or only the flange portion in contact with the inner surface layer of the paper container may have a linear saturated polyester temperature of 40 ° C or higher. It can also be molded from resin.

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

[Embodiment] An embodiment of a paper container provided with a dispensing tool according to the present invention will be described below with reference to FIGS. 1 and 2.

The paper container in this case is of the Gobel top type, with a roof-shaped slanted wall part 1 at the top of which a circular opening 2
Is provided, and the spouting 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 folding the sheet-like 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 / thickness 15
For the paper composite base material 6 having a laminated structure consisting of μ ionomer resin “HIMILAN 1652: DuPont Mitsui Polychemicals Co., Ltd.” layer / aluminum foil with a thickness of 9μ / biaxially stretched polyethylene terephthalate film layer with a thickness of 12μ An outer surface layer 8 comprising a 30 μm thick polyolefin resin “Mirason 16P: manufactured by Mitsui Petrochemical Industry Co., Ltd.” is formed on the acid-resistant paper surface of the paper composite base material 6, and the paper composite base material is also formed. On the biaxially stretched polyethylene terephthalate film layer surface of 6,
30 μm thick ethylene-α-olefin copolymer resin "Ultzex 2020 L: Mitsui Petrochemical Industry Co., Ltd." layer /
Adhesive polyolefin resin “Admar AT 469 with a thickness of 10μ
C: Mitsui Petrochemical Industry Co., Ltd. layer / saturated linear polyester resin 20 μm in thickness “PET G 6763: glass transition temperature 81
C., Eastman Kodak Co., Ltd. ”, a three-layer coextruded 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 by a sealing wall 9. The sealing wall 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 wall 9 is pulled to seal. The wall 9 is designed to be broken and removed at the annular groove 10.

The tip of the tube portion 4 is covered with a cap 12. The cap 12 is formed of a 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 fixed by thermal adhesion.

In order to fill the above-mentioned paper container with the filling material, the roof-shaped top in an unsealed state is carried out, and after the fixed amount filling, the sealed state as shown in FIG. 2 is obtained. At that time, the spout is already bonded to the paper container.

The opening is performed by pulling the ring pull 11 and removing the sealing wall 9 as described above.

[Operation and effect of the invention] As described above, the paper container provided with the spout according to the present invention is
Since the inner surface layer of the paper container is composed of the low crystalline linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, no offensive odor is generated in the atmosphere below the glass transition temperature.

In addition, at least the flange of the spout has a glass transition temperature.
Since it is molded with a linear saturated polyester resin of 40 ° C. or higher and is heat-bonded to the inner surface layer of the paper container at the flange portion, as in the paper container, it has an offensive odor in the atmosphere below the glass transition temperature. Will never occur.

Therefore, the paper container equipped with the spout according to the present invention exhibits an extremely excellent aroma-retaining property in the atmosphere below the glass transition temperature. It does not generate an offensive odor or has an excellent effect on the aroma-retaining property.

Further, since the inner surface layer of the paper container and at least the flange portion of the pouring tool are made of the same type of resin, the adhesive strength between them is high, and therefore the paper container having excellent sealing property even at the pouring tool location can be obtained. It is possible.

[Brief description of drawings]

FIG. 1 shows an embodiment of a paper container provided with a spout 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.

Claims (1)

[Scope of utility model registration request] 1. A paper container in which 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 adhesively fixed to an inner surface layer of the paper container. In the paper container, the inner surface layer of the paper container is composed of a low crystalline linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, and at least the flange portion of the spout has a glass transition temperature of 40 ° C. A paper container provided with a spout, characterized in that it is molded from the above linear saturated polyester resin, and the flange portion of the spout is fixed to the inner surface layer of the paper container by thermal adhesion.