JP2626756B2 - Paper container with fragrance retention performance for filling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention has an excellent property in containing a variety of liquid foods and drinks, tea leaves, spices, and the like, and is excellent in the scent retention performance of a filling material. It concerns paper containers.

[Prior Art] A conventional paper container is composed of a paper container laminated material in which a polyolefin resin layer is laminated above and below an intermediate layer composed of a paper layer. It is formed into various types of paper containers by utilizing the thermal bonding performance of the polyolefin resin layer.

[Problems to be Solved by the Invention] A conventional paper container formed by a paper container laminate in which a polyolefin-based resin layer is laminated above and below an intermediate layer composed of the above-described paper layer is formed by using this paper container laminate. In the step of forming a polyolefin-based resin layer at the time of production and the step of forming a container using the laminated material for paper containers,
The lower polyolefin resin thermally decomposes to generate volatile components such as aliphatic hydrocarbons.

For this reason, this volatile component moves to the filling contained in the paper container, and this causes the filling to have a taste and an unpleasant odor.

A conventional paper container formed by a paper container laminate in which a polyolefin-based resin layer is laminated above and below the intermediate layer made of the paper layer is a polyolefin-based material that forms the inner peripheral surface layer of the paper container. The resin layer absorbs the aromatic components in the filling,
It is easy to permeate, and this also changes the flavor of the filling, which tends to impair the quality.

On the other hand, the present invention solves the above-mentioned drawbacks of the conventional paper container, and does not cause any change in the flavor or odor of the filling caused by the polyolefin-based resin layer. This is a paper container that does not absorb or permeate the fragrance, thereby retaining the fragrance component contained in the filling material and having a good fragrance retention performance. Provided is a paper container which can be easily formed by thermocompression molding.

[Means for Solving the Problems] The paper container of the present invention having a perfume-retaining property of the filling material includes a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, and one surface layer comprising a linear saturated polyester resin layer. Intermediate layer, and a paper container laminate comprising a heat-adhesive polyolefin-based resin or the other surface layer of a heat-adhesive resin layer of a linear saturated polyester resin having a glass transition temperature of less than 40 ° C.,
A paper container having a container body formed such that the one surface layer in the laminated material for a paper container is on the inner peripheral surface side of the container, and furthermore, all of the inner peripheral layer of the container of the paper container is made of glass. It is composed of a linear saturated polyester resin layer having a transition temperature of 40 ° C. or higher.

In the paper container of the present invention having the fragrance preservation performance of the filling material according to the above configuration, the heat-adhesive resin layer, that is, the heat-adhesive polyolefin in the laminated material for the paper container, which is a molding material of the container body of the paper container A thermo-adhesive resin layer of a linear resin or a linear saturated polyester resin having a glass transition temperature of less than 40 ° C.
It can be a heat-adhesive resin layer containing a lubricant.

The paper container laminate, which is a molding material of the container body of the paper container, has one surface layer composed of a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, and a heat-adhesive polyolefin resin or glass. The other surface layer composed of a heat-adhesive resin layer of a linear saturated polyester resin having a transition temperature of less than 40 ° C., and the intermediate layer composed of a paper layer located between the one surface layer and the other surface layer. It is an essential laminated member, and between the one surface layer and the other surface layer, besides the intermediate layer composed of the paper layer, for example, a metal layer or the like may of course be laminated. It is.

The paper container of the present invention having a perfume-retaining property of the filling material is such that the container body of the paper container is formed of a molded product of the laminated material for the paper container. For example, the container body is manufactured separately from the cylindrical container body. Or a paper container in which the entirety of a paper container is formed from a series of laminated materials for paper containers, such as a brick-type paper container or a gobel-top type paper container. Then, all of the inner peripheral layers of the paper container have a glass transition temperature of 40.
It consists of a linear saturated polyester resin layer at a temperature of at least ° C.

Therefore, in a paper container formed by molding the entire paper container with a series of paper container laminate materials, one surface layer of the paper container laminate material is located on the inner peripheral surface side of the container, so that the paper container All of the surrounding layers have a glass transition temperature of 40
Although it becomes a linear saturated polyester resin layer of ℃ or more, in a paper container with a lid material and bottom material attached separately to the body of the container, the glass transition temperature of 40 ℃
It is necessary to use a member in which the above-mentioned linear saturated polyester resin layer is located on the inner peripheral surface side of the container.

Note that, in the paper container having a perfume-retaining property of the filling material of the present invention, the linear saturated polyester resin serving as the container inner peripheral layer is excellent in an atmosphere at a temperature lower than its glass transition temperature. It has a scent retention performance, and from the current situation that the filling in the paper container is usually placed at less than 40 ° C,
In the paper container of the present invention, an excellent scent retention performance of the filling by the linear saturated polyester resin having a glass transition temperature of 40 ° C. or more, which forms the inner peripheral surface layer of the container, is exhibited.

The one surface layer in the laminated material for paper containers is made of a linearly saturated polyester resin having as low a crystallinity as possible, because the adhesive strength of the heat bonding portion formed on the paper container can be made excellent. Preferably, there is.

A linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more, which constitutes one surface layer of the paper container laminate,
For example, ethylene glycol, propylene glycol, 1,4
Alcohol components such as -butanediol and 1,4-cyclohexanedimethanol, and dicarboxylic acids components such as aliphatic dicarboxylic acids such as adipic acid and sebacic acid, and aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and diphenylcarboxylic acid; Specifically, it is formed by a co-condensation polymer such as ethylene glycol and terephthalic acid, ethylene glycol and isophthalic acid and terephthalic acid, 1,4-cyclohexanedimethanol and isophthalic acid and terephthalic acid, and propylene glycol and isophthalic acid and terephthalic acid. However, a linear saturated polyester resin layer made of a co-condensate in which the aliphatic dicarboxylic acid component in the acid component is 10% by weight or more is not preferable because the fragrance retention performance tends to decrease.

Further, the heat-adhesive resin layer constituting the other surface layer of the paper container laminate, that is, a heat-adhesive resin layer of a heat-adhesive polyolefin resin or a linear saturated polyester resin having a glass transition temperature of less than 40 ° C. Of course, the paper container laminate has good thermal adhesiveness to the linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, which constitutes the one surface layer. It also has good thermal adhesion to the paper layer located between it and the surface layer. Also have good thermal adhesion.

In addition, a small amount of a lubricant within a range where the heat bonding ability, which is the characteristic of the heat bonding resin layer, is not reduced to the heat bonding resin layer forming the other surface layer in the paper container laminate. Is added, the heat-adhesive resin layer forming the other surface layer has a good slip property, so that the paper container laminate can be fed very easily during the molding of the paper container. Become. In particular, when the heat-adhesive resin layer forming the other surface layer is made of a linear saturated polyester resin having a glass transition temperature of less than 40 ° C., the slip property of the heat-adhesive resin layer due to the addition of the trace amount of the lubricant is reduced. The improvement effect is remarkable.

The thermoadhesive polyolefin resin forming the other surface layer of the laminated material for paper containers is, for example, poly-α-olefins such as polyethylene, ethylene-α-olefin copolymer, polypropylene, polybutene, polyisobutylene, polybutadiene, polybutadiene. Polydiolefins such as isoprene or copolymers thereof, and ethylene, for example, carboxylic acid, carboxylate, carboxylic anhydride, carboxylic ester, carboxylic amide, carboxylic imide,
A carbonyl group (= CO) based on aldehyde, ketone, etc. alone or a cyano group (-CN), hydroxy group, ether group, oxirane ring And a copolymer with one or more ethylenically unsaturated monomers provided in combination with the above.

Specific examples of the above ethylenically unsaturated monomers include: A. ethylenically unsaturated carboxylic acids: acrylic acid, methacrylic acid, maleic acid, fumaric acid,
Crotonic acid, itaconic acid, citraconic acid, 5-norbornene-2,3-dicarboxylic acid, etc. B. ethylenically unsaturated carboxylic anhydride: maleic anhydride, citraconic anhydride, 5-norbornene-2,3-dicarboxylic anhydride , Tetrahydrophthalic anhydride, etc. C. Ethylene unsaturated esters: ethyl acrylate, methyl methacrylate, 2-ethylhexyl acrylate, monoethyl maleate, diethyl maleate, vinyl acetate, vinyl propionate, γ-hydroxy methacrylate, E. ethyl-unsaturated aldehydes, glycidyl acrylate, glycidyl methacrylate, β-N-ethylaminoethyl acrylate, etc. D. Ethylenically unsaturated amides and ethylenically unsaturated imides: acrylamide, methacrylamide, maleimide, etc. E. Ethylenically unsaturated aldehyde Passing Ethylenically unsaturated ketones: acrolein, methacrolein, vinyl methyl ketone, vinyl butyl ketone and the like.

Among these ethylenically unsaturated monomers, ethylenically unsaturated carboxylic anhydrides and ethylenically unsaturated carboxylic anhydrides are particularly preferred.

Further, the linear saturated polyester resin having a glass transition temperature of less than 40 ° C., which constitutes the other surface layer of the laminated material for a paper container, is used in combination with glycols such as ethylene glycol, propylene glycol, butylene glycol, pentene glycol and cyclohexane dimethanol. And co-condensates with dicarboxylic acids such as terephthalic acid, isophthalic acid and adipic acid.

As the paper layer located between one surface layer and the other surface layer, a high-size waterproof paper used for a paper cup, a liquid paper container, or the like is preferable. In particular, a grammage of 100
By using paper of 400 g / m ^2, a laminated material for a paper container from which a paper container having a good texture can be obtained.

The intermediate layer made of a paper layer or a laminated member of the paper layer and any other member, and the other surface layer made of a heat-adhesive resin layer are laminated with the heat adhesion capability of the other surface layer. Although it is obtained, the intermediate layer and one surface layer, a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more, are laminated using the above-mentioned heat adhesive resin or isocyanate adhesive as the other surface layer. I can do it.

Further, when an intermediate layer composed of a laminated member of a paper layer and a metal is used, the paper layer and the metal may be, for example, polyethylene, ethylene-acrylic acid copolymer, ionomer, ethylene-vinyl acetate copolymer, or the like. Can be laminated by an adhesive.

[Example] Hereinafter, a specific configuration of a paper container having a perfume-retaining property of the filling material of the present invention will be described based on an example.

Example 1 Preparation of Laminated Material for Paper Container FIG. 1 is a cross-sectional view showing a laminated structure of a laminated material 1 for a paper container. Eastman Kodak PET G
6763: One surface layer 2 consisting of a layer with a glass transition temperature of 81 ° C
And the other surface layer 3 composed of a 30 μm-thick adhesive polyolefin resin “Novatech AP XA-133E” manufactured by Mitsubishi Kasei Co., Ltd., and an intermediate layer denoted by reference numeral 4, that is, a 7 μm-thick Al foil. 5 and acid-resistant paper 6 having a basis weight of 300 g / m ² with a thickness of 15 μm.
Ionomer resin "Mitsui DuPont Polychemical Co., Ltd."
And a middle layer 4 made of a laminated member laminated using an adhesive layer 7 made of "Himilan 1652".

The one surface layer 2 and the Al foil 5 surface of the intermediate layer 4 are
Adhesive layer S made of adhesive polyolefin resin “Novatec AP XA-133E, manufactured by Mitsubishi Kasei Co., Ltd.” with a thickness of 60 μm
Further, the other surface layer 3 and the surface of the acid-resistant paper 6 in the intermediate layer 4 were bonded with the heat bonding ability of the heat bonding polyolefin resin forming the other surface layer 3.

Manufacture of lid material and bottom material A 100-μm-thick Al foil and a linear saturated polyester resin with a glass transition temperature of 81 ° C (Eastman Kodak, PET G
A laminated material obtained by bonding a film having a thickness of 30 μm according to “6763” using a polyurethane-based adhesive was formed into a disc shape having a rising portion around the periphery to obtain a lid material and a bottom material, respectively.

Preparation of paper container After cutting the laminated material 1 for a paper container into a rectangular shape, the other side portion is overlapped on one side portion of the laminated material, and the other surface layer 3 of the laminated material in the overlapped portion is formed. 2 and FIG. 3 by heat welding and bonding
A container body consisting of a cylindrical body having a diameter of 5 cm and a height of 12 cm, as indicated by, was prepared such that one surface layer 2 of the laminated material for paper container 1 was on the inner peripheral side of the container.

Next, the bottom member is brought into contact with one opening of the container body 8, and the rising portion of the bottom material and the inner peripheral surface of the container body 8 are heat-welded and bonded to each other, as shown in FIG. A bottom portion indicated by reference numeral 9 was formed to obtain a paper container main body.

Subsequently, after filling 200 ml of orange juice into the paper container main body, the lid material is brought into contact with the opening of the container main body, and the rising portion of the lid material and the inner peripheral surface of the container body 8 are thermally welded. A paper container filled with orange juice was obtained by bonding.

Example 2 Preparation of laminated material for paper container In the laminated structure of laminated material for paper container 1 described in Example 1, the other surface layer 3 was bonded with a lubricant containing 1% by weight of silicon oxide fine powder. The same lamination structure as that of the laminating material 1 for the paper container of Example 1 except that a thermo-adhesive resin layer having a thickness of 30 μm was formed using a functional polyolefin resin “Novatec AP XA-133E manufactured by Mitsubishi Kasei Co., Ltd.” A laminated material for a paper container having the above configuration was obtained.

Production of Lid and Bottom The same lid and bottom described in Example 1 were used.

Preparation of Paper Container A paper container filled with orange juice was obtained according to the method of preparing a paper container described in Example 1.

Comparative Example 1 Preparation of Laminated Material for Paper Container On the other surface layer 3 of the laminated material for paper container 1 described in Example 1, a linear saturated polyester resin having a glass transition temperature of 81 ° C. “Eastman Kodak Company” Made, PET G 6763 ''
To form a polyester resin layer having a thickness of 30 μm to obtain a laminated material for a paper container for comparison.

Production of Lid and Bottom The same lid and bottom described in Example 1 were used.

Preparation of Paper Container According to the method of preparing a paper container described in Example 1, a paper container for comparison filled with orange juice was obtained.

Comparative Example 2 Production of laminated material for paper container Low-density polyethylene resin "Mitsui Petrochemical Industry Co., Ltd.
One 80μm thick surface layer by MIRASON 16SP, 7μm thick Al foil and 300g / m ² basis weight acid-resistant paper, 15μm thick ionomer resin “Mitsui DuPont Polychemical Co., Ltd. , Himiran 1652 ”, an intermediate layer consisting of laminated members laminated using an adhesive layer, and a low-density polyethylene resin“ Milason 16S manufactured by Mitsui Petrochemical Industries, Ltd. ”
P "was laminated on the other surface layer having a thickness of 30 μm to obtain a laminated material for a paper container for comparison.

The one surface layer and the Al foil surface of the intermediate layer are bonded to each other by the heat welding and bonding ability of the one surface layer, and the acid-resistant paper surface of the intermediate layer and the other surface layer are bonded to each other. Were adhered by the heat welding and adhesive ability of the surface layer.

Manufacture of lid material and bottom material A low-density polyethylene resin with a thickness of 60 μm on a 100-μm-thick aluminum foil “Mirason 16S manufactured by Mitsui Petrochemical Industries, Ltd.
The laminated material on which the “P” layer was laminated was formed into a disk shape having a rising portion on the periphery, to obtain a lid material and a bottom material, respectively.

Preparation of Paper Container According to the method of preparing a paper container described in Example 1, a paper container for comparison filled with orange juice was obtained.

[Experiment] The paper containers filled with the orange juices of Examples 1 and 2 and Comparative Examples 1 and 2 were stored in an atmosphere at 20 ° C. for 7 days, opened, and filled. A sensory test of the flavor of the orange juice was conducted.

The results of this sensory test are shown in Table 1 together with the moldability of the container body of each paper container and the texture of the container body.

In Table 1, ◎: very good, ：: good, × poor.

Example 3 Preparation of Laminated Material for Paper Container FIG. 4 is a cross-sectional view showing a laminated structure of a laminated material 50 for a paper container. Eastman Kodak PET G
6763: glass transition temperature 81 ° C ''
And 20 μm thick linear saturated polyester resin “Toyobo Co., Ltd. Byron GM-900: glass transition temperature -20 ° C”
The other surface layer 13 consisting of a layer and an intermediate layer indicated by the reference numeral 14, namely, an Al foil 15 having a thickness of 7 μm and an acid-resistant paper 16 having a basis weight of 200 g / m ² are combined with an ionomer resin having a thickness of 15 μm “Mitsui DuPont Polychemical Co., Ltd. Adhesive layer made by Himilan 1652 manufactured by Co., Ltd.
It was obtained by laminating the intermediate layer 14 composed of a laminated member laminated using the layer 17.

In addition, one surface layer 12 and the Al foil 15 surface of the intermediate layer 14,
20 µm thick linear saturated polyester resin "Toyobo Co., Ltd., Byron GM-900: glass transition temperature -20 ° C"
And the other surface layer 13
The surface of the acid-resistant paper 16 in the intermediate layer 14 was bonded to the surface of the acid-resistant paper 16 by the thermal bonding ability of the linear saturated polyester resin forming the other surface layer 13.

Preparation of paper container After the above-mentioned paper container laminate material 50 is cut into a rectangular shape, the laminated material is bent from one surface layer 12 side to a shape indicated by a symbol m in FIG. And then folded along the pressing lines m1 and m2 of the pressing lines such that one surface layer 12 side of the laminated material 50 becomes the inner peripheral surface, and the bag-shaped precursor is formed. Formed body.

Next, one side portion 19 of the laminated material 50 forming the bag-like precursor
One surface layer 12 and the other surface layer 13 of the laminated material 50 are heat-welded and adhered to each other at a portion where the laminated material 50 overlaps with the other side portion 20, and one of the laminated materials 50 at a peripheral portion indicated by reference numeral 21. The envelope-shaped container in which one surface layer side of the laminated material 50 is the inner peripheral surface side was formed by heat-welding and bonding the surface layers 12 (that is, the inner peripheral surface layers of the bag-shaped precursor). .

Thereafter, after filling the envelope-shaped container with 200 ml of orange juice, one of the surface layers 12 of the laminated material 50 (that is, the bag-shaped material) is formed in the periphery 22 of the opening constituting the envelope-shaped container. The inner peripheral surface layers of the precursor were heat-sealed and bonded to form a sealed package.

Subsequently, the hermetically sealed package is bent and formed along a bending pressing line m attached to the laminated material 50 constituting the hermetically sealed package, thereby forming the laminated material 50 shown in FIG. , The portion indicated by the symbol L is on the front wall, the portion also indicated by the symbol M is on the back wall, and
The portions indicated by N and N are on the respective side walls, the portion indicated by the symbol X is the upper bottom wall, and the portion indicated by the symbol Y is the lower bottom wall. Molded.

Next, in the laminated material 50 shown in FIG. 5, the edge 21 and the other edge 22 are bent in one direction, and the portions protruding from both side walls are provided. Is bent to the surface of the lower bottom wall, and the other surface layers of the laminated material 50 (that is, the outer peripheral surface layers of the container) are thermally welded and bonded to each other. A brick-shaped paper container having a height of 8.5 cm, a width of 6 cm and a depth of 4 cm in the shape shown was obtained.

Example 4 Production of Laminated Material for Paper Container In the laminated structure of the laminated material for paper container 50 described in Example 3, the other surface layer 13 was made of a thickness containing a lubricant composed of 1% by weight of silicon oxide fine powder. 20 μm linear saturated polyester resin “Toyobo Co., Ltd., Byron GM-900: glass transition temperature −20 ° C.” layer, other than that, the same laminate configuration as the laminate 50 of the paper container laminate 50 of Example 3. A laminated material for a paper container having a laminated structure was obtained.

Preparation of Paper Container A paper container filled with orange juice was obtained according to the method of preparing a paper container described in Example 3.

Comparative Example 3 Preparation of laminated material for paper container On the other surface layer 13 of the laminated material for paper container 50 described in Example 3, a linear saturated polyester resin having a glass transition temperature of 81 ° C. was added. Made, PET G 6763 ''
To form a polyester resin layer having a thickness of 30 μm to obtain a laminated material for a paper container for comparison.

Preparation of Paper Container According to the method of preparing a paper container described in Example 3, a paper container for comparison filled with orange juice was obtained.

Comparative Example 4 Preparation of laminated material for paper container Low-density polyethylene resin "Mitsui Petrochemical Industry Co., Ltd.
"Mirason 16SP", one surface layer with a thickness of 40 μm, Al foil with a thickness of 7 μm and acid-resistant paper with a basis weight of 200 g / m ^2, a 15 μm ionomer resin “Mitsui DuPont Polychemical Co., Ltd. , Himiran 1652 ”, an intermediate layer consisting of laminated members laminated using an adhesive layer, and a low-density polyethylene resin“ Milason 16S manufactured by Mitsui Petrochemical Industries, Ltd. ”
P "and the other surface layer having a thickness of 20 µm were laminated to obtain a laminated material for a paper container for comparison.

The one surface layer and the Al foil surface of the intermediate layer are bonded to each other by the heat welding and bonding ability of the one surface layer, and the acid-resistant paper surface of the intermediate layer and the other surface layer are bonded to each other. Were adhered by the heat welding and adhesive ability of the surface layer.

Preparation of Paper Container According to the method of preparing a paper container described in Example 3, a paper container for comparison filled with orange juice was obtained.

[Experiment] A brick type paper container filled with each orange juice of Example 3 to Comparative Example 4 and Comparative Example 3 to Comparative Example 4,
After being stored in an atmosphere at 20 ° C. for 7 days, it was opened, and a sensory test of the flavor of the orange juice as the filling was performed.

The results of this sensory test are shown in Table 2 together with the ease of forming each of the above-mentioned paper containers and the feeling of each paper container.

Example 5 Production of Laminated Material for Paper Container FIG. 7 is a cross-sectional view showing a laminated structure of the laminated material for paper container 23. This laminated material 23 for paper container was prepared by using a linear saturated polyester resin having a thickness of 40 μm. Eastman Kodak PET G
6763: glass transition temperature 81 ° C. ''
And 20 μm thick linear saturated polyester resin “Toyobo Co., Ltd. Byron GM-900: glass transition temperature -20 ° C”
The other surface layer 25 consisting of a layer and an intermediate layer indicated by reference numeral 26, that is, an Al foil 27 having a thickness of 7 μm and an acid-resistant paper 28 having a basis weight of 400 g / m ² are combined with an ionomer resin having a thickness of 15 μm “Mitsui DuPont Polychemical Co., Ltd. Adhesive layer made by Himilan 1652 manufactured by Co., Ltd.
It was obtained by laminating an intermediate layer 26 composed of a laminated member laminated by using the layer 29.

Note that one surface layer 24 and the Al foil 27 surface of the intermediate layer 26,
20 µm thick linear saturated polyester resin "Toyobo Co., Ltd., Byron GM-900: glass transition temperature -20 ° C"
Glued by a layer of adhesive 30 and the other surface layer
25 and the surface of the acid-resistant paper 28 in the intermediate layer 26 are the other surface layer 25
Were bonded by the heat bonding ability of the linear saturated polyester resin.

Preparation of paper container After the above-mentioned paper container laminate 23 is cut into a rectangular shape, the sheet material is bent from one surface layer 24 side of the laminate 23 to a shape indicated by a symbol n in FIG. Then, one side 31 of the laminated material 23 is bent along the pressing line n1 to the other surface layer 25 side, and the other surface layers 25 of the laminated material 23 are heated. An end surface treatment for welding and bonding was performed.

Next, the laminated material 23 along the pressing line n2 and the pressing line n3,
The laminated material 23 was folded so that one surface layer 24 side became an inner peripheral surface, thereby forming a bag-shaped precursor.

Further, at the overlapping portion of one side 32 and the other side 33 of the laminated material 23 forming the bag-like precursor, one surface layer of the laminated material 23 is formed.
After heat welding and bonding the 24 and the other surface layer 25, the pressing line n
Using 1, n2, n3, n4, n5, a rectangular cylinder having a sectional shape shown in FIG. 9 was formed.

In FIG. 9, a portion indicated by reference numeral 34 is an overlapping portion of one side 32 and the other side 33 of the laminated material 23 for a paper container. Molding was performed so that one surface layer 24 of 23 was on the inner peripheral surface side.

Next, bending along the pressing lines n6, n7, n8, and n9 is performed in a direction opposite to that of the bending along the pressing lines n1, n2, n3, n4, and n5, and the portions 35 and 36 are internally formed. After folding in, the box 37 is made the outermost surface of the bottom portion, and the overlap portion is thermally welded and adhered, so that the overlap portion is formed between the one surface layers 24 of the paper container laminate 23, and A bottom portion 38 was formed in which the other surface layers 25 were thermally welded and bonded.

Thereafter, 1000 is placed in the rectangular cylindrical container having the bottom 38.
Fill with ml of orange juice and press lines n11, n12, n1
3, bending along the n14, the pressing lines n1, n2, n3, n4, n5
And the bending along the pressing line n15 was performed, and the portion 39 and the portion 40 were each folded inward.

Further, a head is formed with the portion 41 and the portion 42 as inclined tops, and heat welding and bonding are performed at the overlapping portion, and the overlapping portion is formed between the one surface layers 24 of the paper container laminate 23 and the other surface. By forming the container top 43 formed by heat welding and bonding the layers 25 together, a Gabel top type rectangular parallelepiped shape having a width of 7 cm, a depth of 7 cm, and a height of 20 cm having a shape indicated by reference numeral 44 in FIG. Was obtained.

Example 6 Production of Laminated Material for Paper Container In the laminated structure of the laminated material for paper container 23 described in Example 5, the other surface layer 25 was made of a thickness containing a lubricant composed of 1% by weight of silicon oxide fine powder. A 20 μm linear saturated polyester resin “Toyobo Co., Ltd., Byron GM-900: glass transition temperature −20 ° C.” layer, other than that, the same laminate configuration as the laminate 23 of the paper container laminate 23 of Example 5. A laminated material for a paper container having a laminated structure was obtained.

Preparation of Paper Container A paper container filled with orange juice was obtained according to the method of preparing a paper container described in Example 5.

Comparative Example 5 Preparation of Laminated Material for Paper Container On the other surface layer 25 of the laminated material for paper container 23 described in Example 5, a linear saturated polyester resin having a glass transition temperature of 81 ° C. “Eastman Kodak Company” Made, PET G 6763 ''
To form a polyester resin layer having a thickness of 20 μm to obtain a laminated material for a paper container for comparison.

Preparation of Paper Container According to the method of preparing a paper container described in Example 5, a paper container for comparison filled with orange juice was obtained.

Comparative Example 6 Preparation of laminated material for paper container Low-density polyethylene resin "Mitsui Petrochemical Industry Co., Ltd.
Ltd., MIRASON 1 6SP one and the surface layer of a thickness of 60μm by "manufactured ionomer resin" Mitsui Polychemicals thickness 7μm of Al foil and basis weight 400 g / m ² thickness 15μ and acid paper Co. , Himiran 1652 ”, an intermediate layer consisting of laminated members laminated using an adhesive layer, and a low-density polyethylene resin“ Milason 16S manufactured by Mitsui Petrochemical Industries, Ltd. ”
P "and the other surface layer having a thickness of 20 µm were laminated to obtain a laminated material for a paper container for comparison.

Note that the one surface layer and the Al foil surface of the intermediate layer are bonded by heat welding and bonding ability of the one surface layer, and the acid-resistant paper surface of the intermediate layer and the other surface layer are the other surface layer. Were adhered by the heat welding and adhesive ability of the surface layer.

Preparation of Paper Container According to the method of preparing a paper container described in Example 5, a paper container for comparison filled with orange juice was obtained.

[Experiment] A goebel top type rectangular parallelepiped paper container filled with each orange juice of Example 5 to Example 6 and Comparative Example 5 to Comparative Example 6 was stored in an atmosphere of 20 ° C. for 7 days, and then stored. Was opened, and a sensory test of the flavor of the orange juice as the filling was conducted.

The results of this sensory test are shown in Table 3 together with the ease of forming each of the above paper containers and the texture of the paper containers.

In Table 3, ◎: very good, ：: good, × poor.

[Operation and Effect of the Invention] The paper container of the present invention comprises one surface layer composed of a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, an intermediate layer composed of a paper layer, and a heat-adhesive polyolefin resin or The other surface layer comprising a heat-adhesive resin layer of a linear saturated polyester resin having a glass transition temperature of less than 40 ° C., and the other surface layer comprising a paper container laminate, the one surface layer in the paper container laminate is A paper container having a container body formed so as to be on the container inner peripheral surface side, and wherein all of the container inner peripheral layer of the paper container has a glass transition temperature of 40 ° C. or higher. It consists of layers.

In the paper container of the present invention having the above-described configuration, since the entire inner peripheral surface layer of the container is a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, the temperature of the linear saturated polyester resin is lower than the glass transition temperature. It is possible to take advantage of the property that the filling material has an excellent aroma component holding property in an atmosphere, and thereby, the filling material does not generate a taste or an unpleasant odor, and the filling material has The inner peripheral layer does not easily adsorb and permeate the aroma component, and has excellent quality retention characteristics without impairing the flavor of the filling.

Further, the paper container of the present invention is characterized in that the container body of the paper container has one surface layer composed of a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, an intermediate layer composed of a paper layer, and a heat-adhesive polyolefin. It is formed by laminating a paper container having the other surface layer comprising a heat-adhesive resin layer of a base resin or a linear saturated polyester resin having a glass transition temperature of less than 40 ° C.

Thus, the above laminated material for paper containers has a glass transition temperature.
A linear saturated polyester resin layer having a temperature of 40 ° C. or higher is provided as one surface layer, and the other surface layer is formed of a heat-adhesive polyolefin resin or a heat-adhesive resin layer formed of a linear saturated polyester resin having a glass transition temperature of less than 40 ° C. Therefore, the negative factor to the three-dimensional molding easiness caused by the linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or more is minimized, and the thermal adhesiveness forming the other surface layer It can be formed on the body of the container by utilizing the heat welding and adhesiveness of the resin layer.

Therefore, by utilizing the heat welding and bonding ability of the heat-adhesive resin layer which constitutes the other surface layer of the above-mentioned paper container laminated material, the same simple thermal compression molding as the conventional paper container is used. The container body of the paper container of the present invention can be easily formed.

[Brief description of the drawings]

FIG. 1 is a model sectional view showing an example of a laminated material for a paper container used for molding the container body of the paper container of the present invention, and FIG. 2 is a paper having a container body made of the laminated material for a paper container. Slope view of the container,
FIG. 3 is a cross-sectional view of the paper container of FIG. 2, FIG. 4 is a model cross-sectional view showing another example of a paper container laminate used for molding the container body of the paper container of the present invention, and FIG. FIG. 6 is a plan view of a laminated material for a paper container when a brick-shaped paper container is formed. FIG. 6 is a perspective view showing the brick-shaped paper container formed by using the laminated material for a paper container of FIG. 7 is a model sectional view showing still another example of a laminated material for a paper container used for molding the container body of the paper container of the present invention, and FIG. 8 is a paper container for molding a gobel top type paper container. FIG. 9 is a plan view of the laminated material, FIG. 9 is a cross-sectional view of a torso portion of a gabelle top type paper container formed by the paper container laminate of FIG. 8, and FIG. 10 is a göbel top formed by the paper container laminate of FIG. It is a perspective view of a pattern paper container. 1: laminated material for paper container 2: linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, which forms one surface layer of laminated material 1 for paper container 3: forms another surface layer of laminated material 1 for paper container Thermal adhesive resin layer.

Claims (2)

(57) [Claims] 1. One surface layer composed of a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher, an intermediate layer composed of a paper layer, and a heat-adhesive polyolefin resin or a linear layer having a glass transition temperature of less than 40 ° C. The paper container laminate having the other surface layer made of a heat-adhesive resin layer made of a saturated polyester resin is provided such that the one surface layer in the paper container laminate is on the inner peripheral surface side of the container. A paper container having a container body formed by molding, wherein all of the inner peripheral surface layers of the paper container comprise a linear saturated polyester resin layer having a glass transition temperature of 40 ° C. or higher. Paper container with fragrance retention performance. 2. The paper container according to claim 1, wherein a lubricant is added to the heat-adhesive resin layer in the paper container laminate.