JPH0646825Y2 - Paper container with spout member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of a paper container having a spout member.

<Prior Art> Conventionally, a spout member made of an integrally molded body of polyolefin resin is attached and fixed to an opening formed in a paper container, and further, the opening in the paper container is closed. A paper container having a spout member in which a sealing member is heat-bonded to an inner peripheral surface layer of the paper container and a back surface of the spout member is used for filling a beverage or the like.

This paper container is molded into a container in which the inner and outer surface layers of the paper container are made of a polyolefin resin layer by a laminated material in which both upper and lower surface layers are made of a polyolefin resin. The outlet member is bonded to the paper container by utilizing the thermal adhesiveness of the flange portion of the spout member to the polyolefin resin on the outer surface of the paper container and the flange portion itself. Further, the sealing member is also made of a polyolefin-based resin and is heat-bonded to the polyolefin-based resin layer of the inner peripheral surface layer of the paper container.

<Problems to be Solved by the Invention> By the way, the conventional paper container made of a laminated material in which the inner surface layer is composed of a polyolefin-based resin layer is used at the time of forming the polyolefin-based resin layer at the time of obtaining the laminated material, During molding of a container made of a laminated material, the polyolefin resin layer undergoes thermal decomposition to generate volatile components such as aliphatic hydrocarbons, and these volatile components migrate into the internal filler contained in the container. As a result, not only does it have the adverse effect that the filler has a change in taste or a bad odor, but the polyolefin-based resin layer in the laminated material easily adsorbs or permeates the flavoring component in the filler. Therefore, there is also a drawback that the flavor of the inner filler changes and is easily impaired.

Further, when the sealing member is bonded to the polyolefin resin layer, which is the inner surface layer of the paper container, by the thermal adhesive property as described above, the same adverse effects as in the molding of the paper container and the like occur.

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

<Means for Solving the Problems> In the paper container according to the first to third inventions, the spout member having a concave portion and a flange portion projecting from the periphery of the concave portion is an opening of the paper container. Is attached to the outer peripheral surface layer of the paper container, and the adhesive member is heat-bonded to the back surface of the recessed portion of the spout member, and a seal for closing the opening of the paper container. The stop member is heat-bonded to the inner peripheral surface layer of the paper container and the adhesive member.

The paper container includes a paper having an inner surface layer having an ethylene-vinyl alcohol copolymer resin layer as an innermost surface layer, an intermediate layer composed of a paper composite base material layer, and an outer surface layer made of a polyolefin resin. The container laminated sheet is formed so that the inner surface layer of the laminated sheet becomes the container inner peripheral surface layer.

The ethylene-vinyl alcohol-based copolymer resin of 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 content is also low. Is more than 60 mol%, the adsorbing tendency of the flavoring component in the internal filler becomes high, so it is preferable to use an ethylene-vinyl alcohol copolymer resin having an ethylene content of 40 to 60 mol%. .

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

The outer surface layer of the paper container is to add water resistance to the paper container from the outside, and at the same time, between the heat sealing resin layer laminated on the back surface layer of each of the paper container blanks described above, is excellent. A polyolefin-based resin layer that provides excellent heat welding performance is used.

This polyolefin resin layer is made of, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, polypropylene, etc., and has a thickness of about 3 to 150 μm. It can be configured with the above.

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 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, particularly, by interposing a resin stretched film layer between the paper layer and the ethylene-vinyl alcohol-based copolymer resin as the inner surface layer of the paper container, It is possible to obtain a paper container having excellent properties for folding.

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

Also, in the first to third inventions, the spout member is an integrally molded body made of a polyolefin-based or adhesive polyolefin-based resin, and by removing a part of the recessed portion in the recessed portion, An easily rupturable groove for forming a pouring opening is attached to the portion.

In the first invention, the sealing member is ethylene-
It is composed of an unstretched sheet of vinyl alcohol-based copolymer resin.

This unstretched sheet uses the same resin as that used to form the inner surface layer of the paper container, and preferably has a thickness of 5 to 100 μm.

The adhesive member is composed of a laminated sheet of a polyolefin resin layer and an unstretched ethylene-vinyl alcohol copolymer resin layer. In this laminated sheet, the polyolefin resin layer is 3 to 50 µ, the unstretched ethylene-vinyl alcohol copolymer resin layer is 5 to 50 µ, and the total thickness is preferably 8 to 100 µ.

In the second invention, the sealing member is unstretched ethylene-
It is composed of a laminated sheet of a vinyl alcohol-based copolymer resin film layer, a gas barrier layer, and an unstretched ethylene-vinyl alcohol-based copolymer resin layer, and is heat-bonded to the inner peripheral surface layer of the paper container and the adhesive member. There is.

Examples of the gas barrier layer of the sealing member include vinylidene chloride resin, ethylene-vinyl alcohol copolymer resin,
Polyacrylonitrile resin or aluminum foil can be preferably used, but when the ethylene-vinyl alcohol copolymer resin is used as the gas barrier layer, a polyolefin resin is used as an adhesive on both sides of ethylene-vinyl alcohol. It is necessary to prevent the deterioration of the gas barrier due to the moisture absorption of the copolymer resin.

The thickness of the sealing member is 5 to 50 μm for the unstretched ethylene-vinyl alcohol-based copolymer resin layer and the gas barrier layer.
0.5 to 50 μ, unstretched ethylene-vinyl alcohol-based copolymer resin layer 5 to 50 μ, and it is preferable that the total thickness is 10.5 to 100 μ.

In the third aspect of the present invention, the adhesive member comprises a laminated sheet of a polyolefin resin layer, a gas barrier layer, and an unstretched ethylene-vinyl alcohol copolymer resin layer. The resin layer contacts the back surface of the concave portion of the spout member, and
The vinyl alcohol-based copolymer resin layer is heat-bonded so as to be in contact with the sealing member.

The gas barrier layer of the adhesive member is the same as the gas barrier layer of the second invention.

The thickness of the adhesive member is: polyolefin resin layer 3 to 50 μ gas barrier layer 0.5 to 50 μ unstretched ethylene-vinyl alcohol copolymer resin 5 to 50 μ, preferably 8.5 to 100 μ as a whole.

In the first to third inventions, the size of the opening of the paper container 10 to 40 mmφ, the flange of the spout member 13 to 55 mmφ, the adhesive member 8 to 45 mmφ, and the sealing member 13 to 55 mmφ is preferable.

The adhesive member is preliminarily heat-bonded to the back surface of the concave portion of the spout member, or is inserted during injection molding of the spout member,
The sealing member may be heat-bonded to the paper container and then heat-bonded to the sealing member from the surface layer side of the paper container.

<Example> An example will be described with reference to the drawings.

Example 1 As shown in FIG. 3, the paper container is constructed in this case in a Gobel top type, and a roof-shaped slanted wall portion 1 at the top thereof has a circular opening as shown in FIG. 2 is bored, and the spout member 3 is attached and fixed to the outside of the paper container.

The spout member 3 has a dish-like recessed portion 4 and an endless annular collar portion 5 that extends over the periphery of the recessed portion 4.

The recessed portion 4 is set to have a diameter slightly smaller than the diameter of the opening 2 of the paper container, and is recessed slightly downward from the collar portion 5.

The concave portion 4 is provided with an easily breakable groove 8 for forming a spout 7 at a portion corresponding to the portion 6 by omitting one portion 6 of the concave portion. There is. In this case, the easily breakable groove 8 is provided in an endless ring shape along the contour of the opening 2 of the paper container, and therefore, the part 6 where the concave portion 4 is missing becomes a disk.

A gripping piece 9 is projectingly provided at one location facing the easily breakable groove 8 of the one missing portion 6, and a spout piece 10 is projectingly provided at the collar portion 5 near the gripping piece 9. There is. The gripping piece 9 has a ring-shaped tip, and by pulling this, a crack is generated in the thin portion 11 corresponding to the easily breakable groove 8 and one portion 6 of the concave portion 4 surrounded by the easily breakable groove 8 is formed. Can be removed from the spout member 3.

The spout piece 10 is used for pouring out the filling material from the spout 7 generated in the paper container as a result of the removal of the one portion 6, but the spout piece 10 is used for the gripping piece 9 during transportation of the paper container. It also functions as a protector for preventing external force from acting unintentionally.

The spout member 3 is a polyolefin resin [Sumikasen G
7.1: Sumitomo Chemical Co., Ltd.], the concave part 4 is formed so as to be slightly depressed than the flange part 5, and the flange part 5 is heat-bonded to the outer peripheral surface of the paper container. It is fixed to the paper container by.

The diameter of the opening 2 of the paper container is 24 mmφ, and the diameters of the spout member 3, the collar portion 4 and the easily breakable groove 8 are 33 mmφ and 18 mm, respectively.
mmφ.

The paper container is assembled by folding a laminated sheet for a paper container in a normal procedure, and the laminated sheet has a layer structure as shown in FIG.

That is, the laminated sheet has an ethylene-vinyl alcohol-based copolymer resin [ethylene content 47
% Mol, Eval G: Kuraray Co., Ltd.] layer (10μ) / adhesive polyolefin resin [Novatech AP220L: Mitsubishi Kasei Co., Ltd.] layer (10μ) / ethylene-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 further, a thickness of 12μ was formed on the ethylene-α / olefin copolymer resin layer surface of the laminated resin film. Laminated resin layer 12 obtained by adhering the biaxially stretched polyethylene terephthalate film [Toray Industries, Inc .: Lumirror] with an isocyanate adhesive
And a 15μ thick ionomer resin [Mitsui DuPont Chemical Co., Ltd .: Himiran 16] on the back side of acid-resistant paper with a basis weight of 340 g / m ^2.
52] A paper composite base material that is an intermediate layer 14 obtained by adhering an Al foil having a thickness of 9 μ using an adhesive layer consisting of a layer, and a low-density polyethylene having a thickness of 20 μ on the surface of the acid-resistant paper. It is composed of an outer surface layer 13 obtained by extrusion-coating a resin [Mirason 16SP] layer.

The laminated material is obtained by laminating an Al foil surface of the paper composite base material with an isocyanate adhesive on the surface of the biaxially stretched polyethylene terephthalate film in the laminated resin layer 12.

A sealing member 15 that closes the opening 2 of the paper container is thermally bonded to the inner surface layer 12a of the paper container.

The sealing member 15 is formed by punching an unstretched sheet of ethylene-vinyl alcohol-based copolymer resin [Eval G: Kuraray Co., Ltd.] having a thickness of 30 μm into a disk having a diameter of 35 mmφ, and a paper container. Inner surface layer 12a and the spout member 3
It is heat-bonded to the adhesive member on the back surface of the concave portion 4.

An adhesive member 16 is adhered to the back surface of the concave portion of the spout member 3 by insert during molding of the spout member.

The adhesive member 16 is an ethylene-vinyl alcohol-based copolymer resin [ethylene content 47 mol%, Eval G: Kuraray Co., Ltd.] layer (8 μ) 16a / adhesive polyolefin-based resin [Novatech AP220L: Mitsubishi Kasei Co., Ltd. )] Layer (7μ) / ethylene-α / olefin copolymer resin [Ultox 2020
L: Mitsui Petrochemical Industry Co., Ltd.] A layer (15μ) 16b three-layer coextrusion laminated resin film was formed by an inflation method, and then formed into a disk having a diameter of 27 mmφ.

The above paper container is filled with the filling material from the top of the roof mold in an unsealed state, and after fixed amount filling, the sealed state as shown in FIG. At that time, the spout member 3, the adhesive member
16 and the sealing member 15 are already bonded to the paper container.

The opening of the paper container is performed by hooking the gripping piece 9 with a finger and pulling it, and removing one portion 6 of the concave portion 4 along the easily breakable groove 8. At that time, the adhesive member 16 and the sealing member 15 are also broken substantially along the easily breakable groove 8, and the broken portion is discarded together with the one portion 6 while being attached to the one portion 6 of the concave portion 4.

Example 2 The spout member, the adhesive member and the paper container were constructed in the same manner as in Example 1, but the sealing member was an unstretched ethylene-vinyl alcohol-based copolymer resin [Eval G:
Kuraray Co., Ltd.] layer and an aluminum foil with a thickness of 15μ,
A 10 μm-thick unstretched ethylene-vinyl alcohol copolymer resin [Eval G: Kuraray Co., Ltd.] layer was adhered via an adhesive to form a laminated sheet.

Example 3 The spout member, the adhesive member and the paper container were constructed in the same manner as in Example 1, but the sealing member was a 10 μm thick unstretched ethylene-vinyl alcohol copolymer resin [Eval E:
[Kuraray Co., Ltd.] layer, 15 μm thick adhesive polyolefin resin [Novatech AP2202: Mitsubishi Kasei Co., Ltd.] layer, and 10 μm thick unstretched ethylene-vinyl alcohol copolymer resin [EVAL E :( A three-layer co-extruded laminated film with Kuraray Co., Ltd. layer was formed by T-die formation.

Then, the heat-adhesive side ethylene-vinyl alcohol-based copolymer resin layer was used as a gas barrier layer.

Example 4 The spout member, the paper container and the sealing member are the same as in Example 1. However, the adhesive members consisted of a 20 μm-thick polyolefin resin layer [Mirason 16P: Mitsui Petrochemical Co., Ltd.], a 15 μm-thick aluminum foil, and a 10 μm-thick layer.
An unstretched ethylene-vinyl alcohol copolymer resin [Eval G: Kuraray Co., Ltd.] layer of μ was adhered via an adhesive to form a laminated sheet.

<Operation and effect of the invention> As described above, in the paper container having the spout member according to the present invention, since the inner surface layer of the paper container is composed of the ethylene-vinyl alcohol copolymer resin layer, Due to the fragrance-retaining performance of the resin layer, the resin layer exhibits excellent fragrance-retaining characteristics with respect to filling materials such as orange juice.

Further, the spout member is formed of a polyolefin resin, but since the flange portion to be heat-bonded to the paper container exists outside the paper container, the offensive odor generated during the heat bonding enters the paper container. do not do.

Therefore, the paper container provided with the spout member according to the present invention is
It has an extremely excellent aroma-preserving property and is superior to conventional paper containers equipped with a spout member in that it does not cause a change in taste or odor in the filling material such as juice and has an excellent aroma-preserving property. It has an effect.

Furthermore, the sealing member that closes the opening of the paper container is an unstretched sheet of ethylene-vinyl alcohol copolymer resin, or a laminated sheet in which the surface in contact with the filling is ethylene-vinyl alcohol copolymer resin. Since the inner surface layer of the paper container is composed of an ethylene-vinyl alcohol-based copolymer resin, it is possible to more reliably prevent the inner filler from causing a change in taste or an offensive odor. Is something that can be done.

[Brief description of drawings]

FIG. 1 shows an embodiment of a paper container having a spout according to the present invention. FIG. 1 is a sectional view taken along the line II of FIG. 3, and FIG. 2 is a sectional view similar to FIG. 1 after opening. FIG. 3 is a perspective view of the paper container in a sealed state. 3: spout member, 4: concave part, 5: collar part, 7: spout, 12: inner surface layer, 13: outer surface layer, 14: intermediate layer, 15: sealing member, 16: adhesive member.

Claims (3)

[Scope of utility model registration request] 1. An integral molding of a polyolefin-based resin, which has a concave portion and a flange portion that is formed so as to project from the periphery of the concave portion, and an adhesive member is heat-bonded to the back surfaces of the concave portion and the flange portion. The spout member consisting of is attached to the opening formed in the paper container, and the flange portion of the spout member is fixed by thermal bonding to the outer peripheral surface layer of the paper container. Moreover, in the paper container in which the sealing member that closes the opening of the paper container is heat-bonded to the inner peripheral surface layer of the paper container, the paper container is an ethylene-vinyl alcohol copolymer resin. An inner surface layer having an innermost surface layer, an intermediate layer consisting of a paper composite base material layer, and a laminated sheet for a paper container comprising an outer surface layer made of a polyolefin resin, the inner surface layer in the laminated sheet is With the surface layer inside the container And a rupturable groove for forming a pouring opening in the concave portion of the spout member by omitting one portion of the concave portion. Further, the sealing member is composed of an unstretched sheet made of an ethylene-vinyl alcohol copolymer resin, and the adhesive member is made of a polyolefin resin layer and an ethylene-vinyl alcohol copolymer resin. A polymer resin layer, wherein the polyolefin resin layer is thermally bonded to the spout member, and the ethylene-vinyl alcohol copolymer resin layer is thermally bonded to the sealing member, respectively. A paper container having an outlet member. 2. The sealing member is composed of a laminated sheet composed of an unstretched ethylene-vinyl alcohol copolymer resin layer / gas barrier layer / unstretched ethylene-vinyl alcohol copolymer resin layer, The one unstretched ethylene-vinyl alcohol-based copolymer resin layer in the sealing member is brought into contact with the inner peripheral surface layer of the paper container and the adhesive member on the back surface of the concave portion of the spout member, and the sealing member is 2. The paper container having the spout member according to claim 1, which is heat-bonded to the inner peripheral surface layer of the paper container and the back surface of the concave portion of the spout member. 3. The adhesive member is composed of a laminated sheet comprising a polyolefin resin layer / gas barrier layer / unstretched ethylene-vinyl alcohol copolymer resin layer, and the polyolefin resin layer of the adhesive member is poured. The paper container having a spout member according to claim 1, wherein the unstretched ethylene-vinyl alcohol copolymer resin layer of the adhesive member is heat-bonded to the sealing member on the back surface of the concave portion of the outlet member, respectively.