JPH0646823Y2 - Paper container with spout member - Google Patents

Description

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

[Conventional technology]

Conventionally, a spout member made of an integrally molded body of a polyolefin-based or adhesive polyolefin-based resin is attached and fixed to an opening formed in a paper container, and
A sealing member for closing the opening in the paper container,
A paper container having a spout member heat-bonded to the inner peripheral surface layer of the paper container and the back surface of the spout member is used for filling beverages and the like.

This paper container is formed of a laminated material whose upper and lower surfaces are made of a polyolefin-based resin into a container in which the inner and outer surface layers of the paper container are made of a polyolefin-based resin layer. Is adhered to the paper container by utilizing the thermal adhesiveness of the flange portion of the outer pouring outlet member and the polyolefin resin on the outer surface of the paper container 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 device]

By the way, the conventional paper container made of a laminated material in which the inner surface layer is formed of a polyolefin resin layer is a polyolefin when a polyolefin resin layer is formed when the laminated material is obtained or when a container is formed by the laminated material. The system resin undergoes thermal decomposition to generate volatile components such as aliphatic hydrocarbons, and as a result of this volatile component migrating into the inner filling contained in the container, it changes to the inner filling. Not only does it have the adverse effect of generating a nasty smell and a bad smell, but the polyolefin resin layer in the above-mentioned laminated material tends to adsorb or permeate the flavor component in the internal filler, so that the flavor of the internal filler is It also has the drawback of being easily changed and damaged.

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

[Means for Solving the Problems]

In the paper container of the first to third inventions, a spout member having a concave portion and a flange portion that is formed so as to project from the periphery of the concave portion is attached to the opening of the paper container, and the flange portion is The outer peripheral surface layer of the paper container is heat-bonded, the adhesive member is heat-bonded to the back surface of the concave portion of the spout member, and the sealing member that closes the opening of the paper container is the inner peripheral surface of the paper container. The layer and the adhesive member are heat-bonded.

The paper container comprises an inner surface layer made of a low-crystalline linear saturated polyester resin having a glass transition temperature of 40 ° C. or higher, an intermediate layer made of a paper composite base material layer, and an outer surface layer made of a polyolefin resin. The laminated sheet is molded such that the inner surface layer of the laminated sheet becomes the inner peripheral surface layer of the container.

The linear saturated polyester resin layer constituting the inner surface layer of the laminated sheet for a paper container exhibits excellent aroma retaining performance at a temperature lower than the glass transition temperature of the polyester resin constituting the polyester resin layer. In view of the fact that the inner filler in the paper container is usually placed in an atmosphere of less than 40 ° C., the glass transition should be performed so that the inner surface layer exhibits excellent aroma retaining performance. It is composed of a linear saturated polyester resin at a temperature of 40 ° C 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. Specific examples include ethylene glycol and terephthalic acid, ethylene glycol and isophthalic acid and terephthalic acid, 1,4-cyclohexanedimethanol and ethylene glycol and terephthalic acid, and propylene glycol and isophthalic acid and terephthalic acid. It can be formed by utilizing it.

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.

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 laminated sheet for paper containers 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 laminated sheet for a paper container is to add water resistance performance to the obtained paper container from the outside, and at the same time, with the back surface layer of the laminated sheet for a paper container described above, excellent heat welding performance. The polyolefin-based resin layer that brings about

This polyolefin resin 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-olefin. It may be composed of a 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 laminated sheet for paper containers 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 polyethylene stretched layer. It can be a paper composite substrate layer formed by laminating film layers and the like, and in particular, between the paper layer and the low crystallinity linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more, which is the surface layer inside the paper container. By interposing the resin stretched film layer, a laminated sheet for a paper container having excellent properties for bending can be obtained.

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

Further, in the first to third inventions, the spout member is an integrally molded body made of a polyolefin-based or modified polyolefin-based resin, and by removing a part of the recessed portion in the recessed portion, A frangible groove for forming a pouring opening is attached to the portion.

In the first aspect of the present invention, the sealing member is composed of an unstretched sheet of polyester resin having a glass transition temperature of 40 ° C. or higher. This unstretched sheet uses the same resin as that used for forming the inner surface layer of the paper container, and preferably has a thickness of 3 to 100 μm.

The adhesive member is composed of a polyolefin resin layer or a laminated sheet of a modified polyolefin resin layer and an unstretched polyester resin layer. This laminated sheet has a polyolefin resin layer of 3 to 50 µ, an unstretched polyester resin layer of 3 to 50 µ, and a total thickness of 6 to
It is preferably 100 μ.

In the second invention, the sealing member has a glass transition temperature of 40
Composed of a laminated sheet of the above unstretched polyester resin layer, gas barrier layer and unstretched polyester resin layer,
The unstretched polyester resin layer is in thermal contact with the inner peripheral surface layer of the paper container and the spout member such that the unstretched polyester resin layer is in contact with the inner peripheral surface layer of the paper container and is in contact with the back surface of the concave portion of the spout member via an adhesive member. Has been done.

The gas barrier layer of the sealing member, vinylidene chloride resin, ethylene-vinyl alcohol copolymer resin,
A polyacrylonitrile resin layer or an aluminum foil can be preferably used. The thickness of the sealing member is the unstretched polyester resin layer 3 having a glass transition temperature of 40 ° C. or higher.
~ 60μ Gas barrier layer 0.5 ~ 40μ Unstretched polyester resin 3 ~ 60μ Overall 6.5 ~ 100μ is desirable.

In the third invention, the adhesive member is composed of a laminated sheet of a polyolefin resin layer or a modified polyolefin resin layer, a gas barrier layer, and an unstretched polyester resin layer. The modified polyolefin resin layer is thermally bonded so that the modified polyolefin resin layer is in contact with the back surface of the concave portion of the spout member and the unstretched polyester resin is in contact with the sealing member. The gas barrier layer of the adhesive member is the same as the second gas barrier layer.

The thickness of the polyolefin or modified polyolefin resin layer is 3 to 60 µ, the gas barrier layer is 0.5 to 40 µ, the unstretched polyester resin is 3 to 60 µ, and the total thickness is 6.5 to 100 µ.

As the unstretched polyester resin used in the sealing member or the adhesive member, it is desirable to use the same one as that forming the inner surface layer of the paper container, but it does not necessarily have to have low crystallinity, and glass The transition temperature need not be 40 ° C.

As the unstretched polyester resin, it is desirable to use the same one as that for forming the inner surface layer of the paper container, but it is not necessarily required to have a low crystallinity, and the glass transition temperature is not required.
It need not be 40 ° C.

The modified polyolefin resin in the spout member or the adhesive member includes, for example, polyethylene, ethylene-α-olefin copolymers, polypropylene, polybutene, polyα-olefins such as polyisobutylene, and polydiophin such as polybutadiene and polyisobrene, or these Polyethylene-based polymers such as copolymers and carbonyls based on, for example, carboxylic acids, carboxylic acid salts, carboxylic acid anhydrides, carboxylic acid esters, carboxylic acid amides or imides, aldehydes, ketones, 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 propionate, γ-hydroxymethacrylic acid propyi, β-ethyl ethyl acrylate, glycidyl acrylate, glycidyl methacrylate, β-
N-Ethylaminoethyl acrylate, etc. D. Ethylenic unsaturated amide or imide: Acrylamide, methacrylamide, maleimide, etc. E. Ethylenic unsaturated aldehyde or ketone: Ethylene type such as acrolein, methacrolein, vinyl methyl ketone, vinyl butyl ketone, etc. It is a copolymer with an unsaturated monomer.

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

In addition, the adhesive member is heat-bonded to the back surface of the concave portion of the spout member in advance, is inserted when the spout member is injection-molded, or is heat-sealed to the sealing member on the paper container, and then the surface of the paper container. You may heat-bond to a sealing member from the layer side.

〔Example〕

 Examples 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, a spout member 3 is attached from the inside of the paper container,
It is fixed.

The spout member 3 has a dish-like recessed portion 4 and an endless annular collar portion 5 formed so as to project from 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 as shown in FIG. 2 by removing one portion 6 of the concave portion 4 at a portion corresponding to the portion. There is.
In this case, the easily breakable groove 8 is an endless ring-shaped opening 2 of the paper container.
Is provided along the contour of the concave portion 4 and therefore, the missing portion 6 of the concave portion 4 is a disc.

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 provided at the collar portion 5 near the gripping piece 9. There is. The gripping piece 9 is a rod body having a swollen tip. By pulling this, a crack is generated in the thin portion 11 corresponding to the easily breakable groove 8 and the easily breakable groove 8 is formed.
One portion 6 of the concave portion 4 surrounded by can be removed from the spout member 3.

The spout piece 10 is used for pouring out the inner filling from the spout 7 generated in the paper container as a result of removing the one portion 6, but the external force is applied to the gripping piece 9 during transportation of the paper container. It also functions as a protector to prevent it from acting excessively.

The spout member 3 is formed by integral molding using a polyolefin resin "trade name: Sumikasen G701, manufactured by Sumitomo Chemical Co., Ltd.", and the concave portion 4 is formed so as to be slightly depressed than the collar portion 5, The collar portion 5 is fixed to the paper container by being heat-bonded to the outer peripheral surface of the paper container.

The diameter of the opening 2 of the paper container is 24 mmφ, and the diameters of the flange portion 5 of the spout member 3 and the endless annular easy-breaking groove 8 are 33 mm, respectively.
mmφ and 18 mmφ. The paper container is assembled by folding a laminated sheet for a paper container in a usual procedure, and the laminated sheet has a layer structure as shown in FIG.

The procedure for forming the laminated sheet is as follows.

That is, acid-resistant paper having a basis weight of 340 g / m ² / ionomer resin “HIMILAN 1652: manufactured by Mitsui DuPont Polychemical Co., Ltd.” having a thickness of 15 μm layer / aluminum foil having a thickness of 9 μm / biaxially stretched polyethylene terephthalate film having a thickness of 12 μm For the paper composite substrate to be the intermediate layer 14 of the laminated structure consisting of layers,
On the acid-resistant paper surface of the paper composite substrate, an outer surface layer 13 composed of a 30 μm thick polyolefin resin “Mirason 16P: manufactured by Mitsui Petrochemical Industry Co., Ltd.” is formed. On the axially stretched polyethylene terephthalate film layer surface,
30 μm thick ethylene-α-olefin copolymer resin “Ultzex 2020L: Mitsui Petrochemical Co., Ltd.” layer / 10 μm thick adhesive polyolefin resin “Admer AT469C:
Mitsui Petrochemical Industry Co., Ltd. ”layer / 20 μm thick linear saturated polyester resin“ PET G6763: glass transition temperature 81 ° C., Eastman Kodak Co., Ltd. ” The layers are laminated so that the layers become the inner surface layer 12a.

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

The adhesive member 16 has a thickness of 20 μm polyolefin resin “Mirason 16P: manufactured by Mitsui Petrochemical Industry Co., Ltd.” layer 17 and a 10 μm thick unstretched polyester resin “PETG6763: Eastman Kodak Company” layer / 20 μm thick unstretched polyester resin “Byron GM-990: Toyobo Co., Ltd.” Layer / thickness 10
A sheet formed by laminating a three-layer co-extruded film 18 composed of layers of μ unstretched polyester resin "PETG6763: Eastman Kodak Co." with an adhesive, a diameter of 27 mm.
It is a φ disc.

The polyolefin resin layer 17 of the disc is the spout member 3
Is bonded to the back surface of the concave portion so as to be in contact with the back surface of the concave portion.

A sealing member 15 for closing the opening 2 of the paper container is heat-bonded to the inner surface layer 12a of the paper container and the adhesive member 16.

The sealing member 15 is a polyester resin having a thickness of 10 μm: glass transition temperature 81 ° C. “PETG6763: Eastman Kodak Co.”
Layer / 20 μm thick polyester resin “Byron GM-990: Toyobo Co., Ltd.” Layer / 10 μm thick polyester resin: Glass transition temperature 81 ° C. “PETG6763, Eastman Kodak” layer 40 μm thick The three-layer unextruded sheet is co-extruded and punched into a disk with a diameter of 35 mm.

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. 3 is obtained. At that time, the spout member 3, the sealing member 15, and the adhesive member 16 are already adhered to the paper container.

The opening of the paper container is carried out by bringing the gripping piece 9 with a finger and pulling it to drop out one portion 6 of the concave streak portion 4 along the easily breakable striation groove 8. At that time, the sealing member 15 and the adhesive member 16 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.

Second Embodiment A second embodiment of the present invention will be described with reference to FIG.

In this embodiment, the paper container, the spout member 3 and the adhesive member 16 have the same configuration as in Embodiment 1, but the sealing member
15 used the following.

That is, the sealing member 15 is a polyester resin having a thickness of 10 μ: glass transition temperature 81 ° C. “PETG6763: manufactured by Eastman Kodak” layer / a polyester resin having a thickness of 20 μ “Byron
GM-990: Toyobo Co., Ltd. layer / 10μ thick polyester resin: glass transition temperature 81 ° C “PETG6763, Eastman Kodak Company” layer consisting of 40μ three-layer coextruded film 19,21 A non-stretched sheet of 20 μm thick ethylene vinyl alcohol copolymer resin "Eval F101: made by Kuraray Co., Ltd." It is punched and molded as a plate.

The filling of the filling material into the paper container and the opening of the spout of the paper container in this example could be performed in the same manner as in Example 1.

Third Embodiment A third embodiment will be described with reference to FIG. In this embodiment, the paper container, the spout member 3, and the sealing member 15 have the same structure as in Embodiment 1, but the adhesive member 16 has the following structure.

That is, the adhesive member 16 is made of an aluminum foil 23 having a thickness of 20 μ.
On the other hand, a layer 22 of a polyolefin resin “Mirason 16P: manufactured by Mitsui Petrochemical Industry Co., Ltd.” having a thickness of 20 μ is formed on one side of the layer 22, and an unstretched polyester resin “PETG6763:
From “Eastman Kodak” layer / 20 μm thick unstretched polyester resin “Byron GM-990: Toyobo Co., Ltd.” layer / 10 μm thick unstretched polyester resin “PETG6763: Eastman Kodak” layer The three-layer co-extruded film 24 is laminated with an adhesive, and a sheet having a diameter of 27 mmφ is punched out.

The polyolefin resin layer 22 of the disc is the spout member 3
Is adhered to the back surface so as to be in contact with the back surface.

The filling of the filling material into the paper container and the opening of the spout of the paper container in this example could be performed in the same manner as in Example 1.

[Function and effect of device]

As described above, since the inner surface layer of the paper container having the spout member according to the present invention is composed of the low-crystalline polyester resin layer having a glass transition temperature of 40 ° C. or higher, Due to its scent performance, it has excellent fragrance-retaining characteristics for filling materials such as orange juice. Further, the spout member is formed of a polyolefin-based or modified polyolefin-based resin, but since the collar portion to be heat-bonded to the paper container is present outside the paper container, the offensive odor generated during the heat-bonding is a paper container. Do not intrude inside.

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 polyester resin having a glass transition temperature of 40 ° C. or higher, or a polyester resin whose surface in contact with the filling material has a glass transition temperature of 40 ° C. or higher. Since it is composed of a laminated sheet, the inner surface layer of the paper container is composed of a low crystalline polyester resin having a glass transition temperature of 40 ° C. or higher, which causes a change in taste or an offensive odor in the inner filler. Can be more reliably prevented.

Furthermore, the adhesive member is composed of a laminate of a polyolefin-based resin layer or a modified polyolefin-based resin layer and an unstretched polyester resin layer, and the polyolefin-based resin layer or the modified polyolefin-based resin layer is the spout member, the unstretched. Since the polyester resin layers are respectively adhered to the sealing member, the adhesive strength of the sealing member to the spout member is increased without impairing the fragrance retaining property of the sealing member, and the sealing member of the sealing member is not opened. It is possible to ensure breakage.

[Brief description of drawings]

FIG. 1 shows an embodiment of a paper container having a spout member according to the present invention. FIG. 1 is a sectional view taken along line I- of FIG. 3, and FIG. 2 is a sectional view similar to FIG. FIG. 4 is a perspective view of a paper container in a sealed state, FIG. 4 is a sectional view similar to FIG. 1 of another embodiment, and FIG. 5 is a sectional view similar to FIG. 1 of still another embodiment. 2: Opening part, 3: Spout member, 4: Concave part, 5: Collar part, 6: Part surrounded by easy-break groove of concave part, 7: Spout, 8: Easy-break groove, 12a : 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. A paper container is provided with a spout member which is an integrally formed body of a polyolefin-based or modified polyolefin-based resin and has a recessed portion and a flange portion that is formed so as to project from the periphery of the recessed portion. A seal that is attached to the opening and is fixed by heat-bonding the flange portion of the spout member to the outer peripheral surface layer of the paper container, and that closes the opening of the paper container. The member, on the back surface of the concave portion of the spout member, the inner peripheral surface layer of the paper container and the inner peripheral surface layer of the paper container through an adhesive member having a thermal adhesive property to both the spout member and the sealing member. In a paper container which is heat-bonded to the back surface of the concave portion of the spout member, the paper container is an inner surface layer made of a low crystalline polyester resin having a glass transition temperature of 40 ° C. or higher, and an intermediate layer consisting of a paper composite base material layer. And poly A laminated sheet for a paper container having an outer surface layer made of a reffin resin is formed so that an inner surface layer of the laminated sheet becomes an inner peripheral surface layer of the container, and a concave portion of the spout member is formed. Is provided with an easily breakable groove for forming a pouring opening in the concave portion by omitting one portion of the concave portion. Further, the sealing member has a glass transition temperature.
It is composed of an unstretched sheet of a polyester resin of 40 ° C. or higher, and the adhesive member is composed of a laminate of a polyolefin resin layer or a modified polyolefin resin layer and an unstretched polyester resin layer, and the polyolefin resin layer or A paper container having a spout member, wherein a modified polyolefin resin layer is adhered to the spout member and the unstretched polyester resin layer is adhered to the sealing member. 2. A sealing member is composed of a laminated sheet of an unstretched polyester resin layer having a glass transition temperature of 40 ° C. or higher, a gas barrier layer, and an unstretched polyester resin layer. The layer is in contact with the inner peripheral surface layer of the paper container and is in contact with the concave portion back surface of the spout member via an adhesive member, and the sealing member is the inner peripheral surface layer of the paper container and the spout member. The paper container having the spout member according to claim 1, which is heat-bonded to the back surface of the concave portion. 3. The adhesive member is composed of a laminated sheet of a polyolefin resin layer or a modified polyolefin resin layer, a gas barrier layer, and an unstretched polyester resin layer, and the polyolefin resin layer is a spout. The adhesive member is heat-bonded to the recessed portion back surface of the spout member and the sealing member so that the unstretched polyester resin layer is in contact with the recessed portion rear surface of the member. A paper container having the spout member according to claim 1.