JPH1149141A - Paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a package body which is excellent in gas barrier properties, strength, heat resistance, suitability for filling and packaging contents and the preservability of them, and environmentally sound, by forming a box from a laminated material in which a resin layer comprising a crystallizable aromatic polyamide resin and a heat-bondable resin layer are bonded together on a paper base material. SOLUTION: From outside to inside, onto a paper base material 1 a polyamide resin layer 2 is bonded, the polyamide resin layer 2 comprising as its main constituents one or more kinds of a crystallizable aromatic polyamide resin obtained by a polycondensation reaction between an aromatic diamine such as methaxylenediamine or paraxylenediamine and a dicarboxylic acid and its derivative, and one or more kinds of an aliphatic polyamide resin such as hexamethylenediamine or decamethylenediamine. Further, onto the inside of it a heat-bondable resin layer 3 is bonded as the innermost layer, the heat- bondable resin layer 3 being a film of a resin, such as low-density polyethylene, which can be fused by the application of heat in the process of making a box, paper container, and is rich in the retention of the aroma of contents.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container, and more particularly, to a paper container having a good gas barrier property against oxygen gas and the like and a sufficient strength, and a milk, a lactic acid bacterium drink, and a liquid container.
The present invention relates to a barrier-type paper container suitable for filling and packaging of various liquid beverages such as beverages, fruit juice drinks, barley tea, green tea, oolong tea, alcoholic beverages, and the like.

[0002]

2. Description of the Related Art Conventionally, various types of paper containers having barrier properties have been developed and proposed, but usually, a barrier material such as aluminum foil is further interposed in a laminated material constituting the container. Let me. Thus, such containers are typically single-use disposable containers. However, in recent years,
In response to a request for resource reuse, there has been a demand for a container that can be collected after use, separated by material, and reused. However, in a container made of a laminated material using an aluminum foil as described above, a resin film,
It is extremely difficult to separate and collect each material such as paper base, aluminum foil, etc.
There is a problem that it is practically impossible.

Therefore, various paper containers having good barrier properties without using a barrier material such as aluminum foil have been developed and proposed. For example, from the outer side to the inner side of the paper container, (1) a paper container formed of a laminated material having a five-layer structure of polyethylene resin layer / paper layer / polyethylene resin layer / biaxially stretched polyamide film layer / polyethylene resin layer (JP-A-63-22624) or (2) polyethylene resin layer / paper layer / polyethylene resin layer / saponified layer of ethylene-vinyl acetate copolymer / A paper container (Japanese Patent Application Laid-Open No. 63-212143) formed of a laminated material having a five-layer structure of a polyethylene resin layer, or, similarly, from the outside to the inside of the paper container,
(3) A paper container formed of a laminated material having a six-layer structure of polyethylene resin layer / paper layer / polyethylene resin layer / saponified layer of ethylene-vinyl acetate copolymer / biaxially stretched polyamide film layer / polyethylene resin layer. (Japanese Unexamined Patent Application Publication No.
No. 160551) have been developed and proposed.

[0004]

However, the paper container as described above is excellent in one aspect, but is not satisfactory in the other aspect. There is a demand for the development of new products and technologies. For example, the paper container of the above (1) has a problem that the gas barrier property of the biaxially stretched polyamide film layer is insufficient. In the paper container of the above (2), the barrier by the saponified layer of the ethylene-vinyl acetate copolymer is used.
Although the property is good, there is a problem that the strength as a paper container is lacking. Furthermore, in the paper container of the above (3), since the paper base material layer is provided outside the saponified layer of the ethylene-vinyl acetate copolymer and the biaxially stretched polyamide film layer, an excellent barrier is provided. -Although it is possible to have both properties and sufficient strength, since it has both a saponified layer of an ethylene-vinyl acetate copolymer and a biaxially stretched polyamide film layer, on the contrary, the production cost However, there is a problem in that it is not practically used. As described above, the conventional paper container has many advantages, and although it is currently used, it is still unsatisfactory, and a proposal for a new paper container is desired. It is rare. Therefore, the present invention provides a barrier that is excellent in barrier properties against oxygen gas and the like, is also rich in strength as a container, has suitability for filling and packaging the contents thereof, has excellent storage stability, and is environmentally friendly. An object of the present invention is to provide a functional paper container.

[0005]

The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, the crystalline aromatic polyamide resin has gas barrier properties, and further has strength and elasticity. Focusing on high ratio, high heat resistance, excellent chemical resistance, etc., and low water absorption, low moisture permeability, etc. ,
Directly extruding and laminating a resin composition containing one or more crystalline aromatic polyamide-based resins and one or more aliphatic polyamide-based resins to form a polyamide-based resin layer, Laminate a thermo-adhesive resin layer as an inner layer, laminate at least a paper base, a polyamide-based resin layer, and a thermo-adhesive resin layer as an innermost layer, and laminate a thermo-adhesive resin layer as an outermost layer By manufacturing a laminated material comprising, using the laminated material, according to a conventional method, to produce a blank plate capable of producing a paper container,
When a paper container was manufactured by making a box using this, it was excellent in gas barrier properties such as oxygen, and further, strength as a container,
It has been found that the present invention is excellent in heat resistance, etc., has the suitability for filling and packaging the contents, has excellent storage stability, and can produce extremely good packaged products suitable for environmental protection. is there.

That is, the present invention relates to a polyamide-based resin composition comprising at least one of a paper base material and one or more crystalline aromatic polyamide resins and one or more aliphatic polyamide resins. The present invention relates to a paper container characterized by using a laminated material obtained by laminating a resin layer and a heat-adhesive resin layer as an innermost layer, and forming the laminated material into a box.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. First, in the present invention, an example of a paper container according to the present invention will be exemplified and described with reference to the drawings. FIGS. 1 and 2 show an example of a layer configuration of a laminated material constituting the paper container according to the present invention. FIG.
FIG. 3 is a schematic plan view showing a configuration of a paper container forming blank plate manufactured using the laminated material shown in FIG. 1 or FIG. 2, and FIG. 4 is a paper container forming blank plate shown in FIG. FIG. 5 is a schematic perspective view showing a configuration of a paper container forming body manufactured using the paper container. FIG. 5 is a perspective view of a paper container according to the present invention manufactured using the paper container forming body shown in FIG. FIG. 6 is a schematic perspective view showing the configuration, and FIG. 6 is a schematic perspective view showing the configuration of a filled and packaged product in which contents are filled and packaged using the paper container according to the present invention shown in FIG.

First, in the present invention, as a laminated material A constituting the paper container according to the present invention, as shown in FIG.
From the outside to the inside, at least the paper substrate 1, a polyamide-based resin made of a resin composition containing, as a main component, one or more of a crystalline aromatic polyamide-based resin and one or more of an aliphatic polyamide-based resin Layer 2 and a heat-adhesive resin layer 3 as the innermost layer are sequentially laminated, and more specifically, as a laminated material A ′ constituting the paper container according to the present invention, As shown in FIG. 2, from the outer side to the inner side, at least a thermo-adhesive resin layer 3 ′ as an outermost layer, a paper substrate 1, one or more of a crystalline aromatic polyamide-based resin and an aliphatic polyamide-based resin It has a configuration in which a polyamide-based resin layer 2 of a resin composition containing one or more resins as a main component and a heat-adhesive resin layer 3 as an innermost layer are sequentially laminated.

Thus, the laminated material A or A 'as described above
As an example of a paper container according to the present invention using the above, as shown in FIG. 3, first, the laminated material A or A ′ produced above is manufactured.
, Then use the given crease (shown in dotted lines)
1, a blank plate B for forming a paper container having a sticking portion 4 or the like constituting a body portion is manufactured by punching, and then, as shown in FIG. 4, the blank plate B for forming a paper container is attached. The portion 4 is superimposed on the other side end 5 (shown in FIG. 3) and the overlapped portion is heat-sealed to form a side end seal 6 (4, 5) to form a paper container. As shown in FIG. 5, the folded part of the lower part of the paper container forming trunk C manufactured as described above is folded in accordance with a conventional method, and heat sealed to form a box. The paper container D according to the present invention is manufactured by forming the bottom 7. Thus, in the present invention, as shown in FIG. 6, the contents 8 are filled from the opening in the upper part of the paper container D manufactured as described above, and then the folded pieces in the upper part corresponding to the opening are filled. Is folded in accordance with a normal box-making method and heat-sealed to form, for example, a roof-type seal portion 9 to manufacture the filled and packaged product E according to the present invention.

In the present invention, the laminated material, the paper container, and the like illustrated and exemplified above are merely examples.
It is needless to say that the present invention is not limited to this, and various forms of laminated materials, paper containers, and the like can be manufactured depending on the purpose, application, and the like. Instead of, for example, brick type,
Various types of paper containers such as a flat top type and a paper can can be manufactured.

In the above, although not shown, when manufacturing the laminated material according to the present invention, the paper base and the polyamide resin layer are formed by adding one kind of a crystalline aromatic polyamide resin to the paper base. A polyamide resin layer of a resin composition containing as a main component thereof one or more of one or more aliphatic polyamide resins may be directly laminated, or a crystalline aromatic polyamide resin may be formed on a paper base. A polyamide resin layer, an adhesive resin layer, and a thermo-adhesive resin layer of a resin composition containing one or more of a resin and one or more of an aliphatic polyamide resin as main components are simultaneously extruded and laminated. And a resin composition containing as a main component one or more of a crystalline aromatic polyamide-based resin and one or more of an aliphatic polyamide-based resin. Polyamide-based resin layer may be one that is biaxially stretched. Thus, in the present invention, the adhesiveness between the paper base and the polyamide resin layer is extremely good, and for example, the laminate is directly laminated without the need for an adhesive extruding resin or an adhesive layer such as an adhesive. It is possible,
Further, the thickness of the entire laminated material can be set to be substantially the same as that of the conventional liquid paper container for juice and the like, and a change in conditions in a paper container manufacturing process, a filling process, and the like can be minimized. This is because it is advantageous in terms of cost. At this time, if necessary, various known pretreatments such as a primer treatment, an ozone treatment, a plasma treatment, a framing treatment, a corona discharge treatment and a chemical treatment may be applied to the surface of the paper base material. it can.

In the above, when manufacturing the laminated material, the paper container and the like according to the present invention, both ends of the blank plate for forming a paper container punched from the laminated material are overlapped and the overlapped portion is adhered. Needless to say, a seal method such as a frame seal or a hot air seal can be adopted when the paper container forming body is manufactured. Furthermore, upon the above-mentioned attachment, if necessary,
In order to protect the end face of the blank plate, various end face treatment methods such as a folding hemming method in which the end face is simply folded, a skive hemming method in which the end face is cut and a tape sticking method in which a plastic film or the like is stuck to the end face, and the like are used. Can be adopted.

Next, in the present invention, a blanking method for manufacturing a blank for forming a paper container from a laminated material, a method for manufacturing a body for forming a paper container from the blank for forming a paper container, A method of manufacturing a paper container by box-forming a body portion for forming a paper container can be carried out by a crease applying method, a blank plate punching method, a box manufacturing method, or the like, as in the related art.

Next, in the present invention, the materials constituting the laminated material, the paper container and the like according to the present invention as described above, the manufacturing method thereof, and the like will be described.
Various materials, methods and the like can be used or adopted. First, in the present invention, the paper substrate is a substrate that constitutes a container, and has moldability, bending resistance, rigidity, waist, strength, and the like. Bleached or unbleached paper substrate, or pure white roll paper,
Paper base materials such as kraft paper, paperboard, and processed paper, and the like can be used. In the above, as the paper base material constituting the paper layer, it is desirable to use a base material having a basis weight of about 80 to 600 g / m ² , preferably a base weight of about 100 to 450 g / m ² . In the present invention, a desired printing pattern such as a character, a figure, a symbol, a picture, a pattern, and the like may be applied to the paper base as described above by a normal printing method.

Next, in the present invention, the crystalline aromatic polyamide resin constituting the polyamide resin layer includes:
For example, meta-xylene diamine, aromatic diamine such as para-xylene diamine, and adipic acid, suberic acid, sebacic acid, cyclohexanedicarboxylic acid, terephthalic acid,
One or more aromatic crystalline polyamide resins obtained by a polycondensation reaction with a dicarboxylic acid such as isophthalic acid or a derivative thereof can be used. Specifically, for example, nylon MXD6 (trade name, manufactured by Mitsubishi Gas Chemical Co., Ltd.) can be used.

In the present invention, examples of the aliphatic polyamide resin constituting the polyamide resin layer include hexamethylene diamine, decamethylene diamine, dodecamethylene diamine, 2, 2, 4- or 2,
4,4-trimethylhexamethylenediamine, 1,3-
Or 1,4-bis (aminomethyl) cyclohexane,
Aliphatics such as bis (p-aminocyclohexylmethane),
Aliphatic polyamides and ε-aminocaproic acids obtained by a polycondensation reaction of an alicyclic diamine or the like with a dicarboxylic acid such as adipic acid, suberic acid, sebacic acid, cyclohexanedicarboxylic acid, terephthalic acid, or isophthalic acid or a derivative thereof. , 11-aminoundecanoic acid, etc., polyamide resin, ε-caprolactam, ω
-One or more polyamide resins obtained from a lactam compound such as laurolactam, or a mixture thereof can be used. Specifically, for example, nylon 6, nylon 66, nylon 9, nylon 11,
Nylon 12, Nylon 6/66, Nylon 66/61
An aliphatic polyamide resin such as 0 can be used.

Further, in the present invention, a resin composition containing one or more crystalline aromatic polyamide-based resins and one or more aliphatic polyamide-based resins as main components will be described. Mix one or more of the crystalline aromatic polyamide resin and one or more of the aliphatic polyamide resin, if necessary, for example, plasticizer, antioxidant, ultraviolet absorber,
Light stabilizers, coloring agents such as dyes and pigments, lubricants, antistatic agents,
A known additive such as a filler or the like can be optionally added, and if necessary, a solvent and a diluent can be used to sufficiently mix to produce a resin composition. In the above resin composition, the compounding ratio of the crystalline aromatic polyamide resin and the aliphatic polyamide resin is such that the latter is 5 to 50% by weight, preferably 10 to 40% by weight based on the former. It is desirable to mix. In the present invention, blending the aliphatic polyamide resin with the crystalline aromatic polyamide resin is by blending an aliphatic polyamide resin that is more flexible than the crystalline aromatic polyamide resin. The crystalline aromatic polyamide-based resin is provided with flexibility, and thus, in the present invention, the crystalline aromatic polyamide-based resin having excellent barrier properties is regarded as sea, and on the other hand, excellent in flexibility. By forming an aliphatic polyamide resin into islands and forming an islands-in-sea structure with both islands, both high barrier properties and flexibility are achieved, and the desired effect is achieved. Further, in the present invention, the crystalline aromatic polyamide-based resin is inferior in film-forming property and stretchability as compared with the aliphatic polyamide-based resin. Improve the film forming property and stretchability of the crystalline aromatic polyamide resin, furthermore, because of the high cost of the crystalline aromatic polyamide resin, the crystalline aromatic polyamide resin and the aliphatic polyamide resin It can also be used together to reduce the cost. In the above, when the blending ratio of the aliphatic polyamide-based resin is 50% by weight or more, and more preferably 40% by weight or more, flexibility can be imparted, but the barrier property of the crystalline aromatic polyamide-based resin can be improved. Is not preferred because it decreases, and the compounding ratio of the aliphatic polyamide resin is
When the content is 5% by weight or less, further 10% by weight or less, the crystalline aromatic polyamide-based resin has excellent barrier properties,
Flexibility cannot be imparted, and, for example, cracks in the ruled line portion of the paper container or pinholes are generated, which is not preferable.

Next, in the present invention, the polyamide resin layer made of the above resin composition will be described.
In the present invention, a film or a sheet of the above resin composition is formed by using a molding method such as extrusion molding, injection molding, calendaring, co-extrusion molding, and co-injection molding. -Molded, and then
The polyamide resin layer can be formed by laminating the film or sheet directly or, if necessary, on one surface of a paper base material through a surface treatment or an adhesive. Alternatively, in the present invention, a polyamide resin layer can be formed by applying or printing the above resin composition to form a coating film or a printed film of the resin composition. In the present invention, the film or sheet made of the resin composition formed by the method described above may be used in a usual manner.
At the time of or after the production of the sheet-like material, it can be stretched in biaxial directions in the vertical and horizontal directions, and can be used as a biaxially stretched film or sheet. Thus, in the present invention, when the film or sheet biaxially stretched as described above is used as the polyamide resin layer,
The present invention can exhibit a higher barrier effect against oxygen, water vapor, and the like, and can produce a laminated material having high heat resistance. In the above,
The thickness of the polyamide resin layer is, for example, 2 to 10
It is desirably about 0 μm, preferably about 5 to 50 μm.

In the present invention, when the above resin composition is used and a polyamide resin layer is directly laminated on one side of a paper substrate, for example, the above-mentioned crystalline aromatic polyamide is used. A resin composition containing one or more of the base resins and one or more of the aliphatic polyamide resins as main components, an extruded adhesive resin such as a polyethylene resin, and a heat adhesive resin as the innermost layer. The polyamide resin layer can be formed on one side of the paper base material by simultaneously coextruding and laminating three layers using a co-extrusion lamination method such as a T-die. Examples of the extrusion adhesive resin such as the above-mentioned polyethylene resin include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ionomer. -Resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene
Polyolefin resins for extrusion such as methacrylic acid copolymers, ethylene-methyl methacrylate copolymers, or acids obtained by modifying olefin resins with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, and maleic anhydride. An adhesive resin such as a modified polyolefin-based resin can be used.

Further, in the present invention, the material constituting the heat-adhesive resin layer as the innermost layer is a layer which plays a role of adhesion when making a paper container and making direct contact with the contents. Therefore, a resin film or sheet that can be melted by heat and adhere to each other and that has a good scent retention property of the contents can be used. Specifically, for example, low density polyethylene, medium density Polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene- Methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene poly -, An acid-modified polyolefin resin obtained by modifying polyethylene or polypropylene with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, fumaric acid, etc., polyvinyl acetate resin, poly (meth) acrylic resin, polychlorinated resin A film or sheet of a resin such as a vinyl resin or the like can be used. Especially,
In the present invention, when the content needs to have a fragrance retention property, for example, terephthalic acid or isophthalic acid is used as an acid component, and polyethylene terephthalate obtained by polycondensing these with ethylene glycol. Heat-sealable polyester resins such as to-isophthalate copolymer,
Alternatively, a resin film or sheet such as a saponified ethylene-vinyl acetate copolymer which can be heat-sealed can be used. Thus, the above film or sheet
The coating can be used in the form of a coating film of a composition containing the resin. The thickness of the film, film or sheet is preferably about 5 μm to 200 μm, and more preferably about 10 μm to 100 μm.

Next, in the present invention, the material constituting the heat-adhesive resin layer as the outermost layer, which is laminated on one side of the paper base material, plays a role of adhesion when making a box as a paper container. Therefore, resin films or sheets that can be melted by heat and fused to each other can be used. Specifically, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear ( Linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-
Methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyethylene or polypropylene, etc., for acrylic acid, methacrylic acid, fumaric acid, etc. A resin film or sheet of an acid-modified polyolefin resin modified with an unsaturated carboxylic acid, a polyvinyl acetate resin, a poly (meth) acrylic resin, a polyvinyl chloride resin, or the like can be used. Thus, the above-mentioned film or sheet can be used in a state of a coating film of a composition containing the resin. The thickness of the film, film or sheet is preferably about 5 μm to 100 μm, and more preferably about 10 μm to 50 μm. In the present invention, a desired printing pattern such as a character, a figure, a symbol, a pattern, a pattern, etc. may be applied to the film or sheet as described above by a normal printing method.

Next, in the present invention, if necessary, a material having, for example, a property of blocking light such as sunlight or a property of not transmitting water vapor, water, gas, etc., is used as the intermediate substrate. It can be used, and it may be a single substrate or a composite substrate obtained by combining two or more types of substrates. Specifically, for example,
Films or sheets of resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, etc. having a barrier property against water vapor, water, etc. Other colorants having a light-shielding property or a sheet formed by kneading a colorant such as described above and adding a desired additive to form a film can be used.
These materials can be used alone or in combination of two or more. The thickness of the above-mentioned film or sheet is arbitrary, but usually 5 μm to 300 μm.
μm, more preferably about 10 μm to 100 μm.

Next, in the present invention, if necessary, the intermediate substrate may have excellent properties, for example, mechanical, physical, chemical, etc. And tough and heat-resistant resin films or sheets. Specific examples thereof include polyester resins, polyamide resins, polyaramid resins, polyolefin resins, and polycarbonate resins. −
A tough resin film or sheet, such as a resin-based resin, a polyacetal-based resin, a fluorine-based resin, or the like, may be used. Thus, as the resin film or sheet, any one of an unstretched film and a stretched film stretched in a uniaxial or biaxial direction can be used. The thickness of the film is about 5 μm to 100 μm, preferably 1 μm to 100 μm.
About 0 μm to 50 μm is desirable. In the present invention, for example, a desired printing pattern such as a character, a figure, a symbol, a pattern, a pattern, or the like is printed on the resin film or sheet as described above using a normal printing method. Printing or the like may be performed.

In the present invention, since the packaging container is usually subjected to severe physical and chemical conditions, strict packaging suitability is required for the packaging material constituting the packaging container. And various conditions such as deformation prevention strength, drop impact strength, pinhole resistance, heat resistance, sealability, quality maintenance, workability, hygiene, etc. are required. Any material that satisfies the above conditions can be selected and used.Specifically, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, Ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid or methacrylic acid copolymer, Chillpentene polymer, polybutene resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer, poly (meth) acrylic resin, polyacrylonitrile resin, Polystyrene-based resin, acrylonitrile-styrene copolymer (AS-based resin), acrylonitrile-butadiene-styrene copolymer (ABS-based resin), polyester-based resin, polyamide-based resin, polycarbonate-based resin, polyvinyl alcohol Resin, saponified ethylene-vinyl acetate copolymer, fluororesin,
It can be arbitrarily selected from known resin films or sheets such as diene resins, polyacetal resins, polyurethane resins, nitrocellulose and others. In addition, for example, a film such as cellophane, synthetic paper, or the like can be used. In the present invention, the above-mentioned film or sheet can be used in any of unstretched and uniaxially or biaxially stretched. The thickness is arbitrary, but is from several μm to 3 μm.
It can be used by selecting from a range of about 00 μm.
Further, in the present invention, the film or sheet may be any film such as an extruded film, an inflation film, or a coating film.

In the present invention, when the above materials are used, for example, pigments, antioxidants, slip agents, antistatic agents, inorganic fillers, ultraviolet absorbers, etc. An additive can be optionally added and used.

Next, a method of manufacturing a laminated material using the above-mentioned materials in the present invention will be described.
For example, wet lamination, dry lamination, solventless dry lamination, extrusion lamination, T-die co-extrusion molding, co-extrusion lamination, inflation, It can be performed by others. Thus, in the present invention, when performing the above-mentioned lamination, if necessary, for example,
Pretreatments such as corona treatment and ozone treatment can be applied to the film and the like. For example, anchor coating agents such as isocyanate (urethane), polyethyleneimine, polybutadiene and organic titanium can be used. Alternatively, known anchor coating agents and adhesives such as polyurethane-based, polyacrylic, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, and other laminating adhesives are used. be able to.

In the present invention, when laminating as described above, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear)
Low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer,
Use of adhesive resin such as polyolefin resin for extrusion such as ethylene-methacrylic acid copolymer and ethylene-methyl methacrylate copolymer, or copolymer of olefin resin with acid anhydride such as maleic anhydride And can be laminated.

In the present invention, the paper container according to the present invention produced as described above is suitable for filling and packaging of various articles, for example, liquid foods such as milk, dairy products, juices, seasonings, etc. Further, it can be used for filling and packaging of articles such as chemicals such as adhesives and pressure-sensitive adhesives, medicines, cosmetics, miscellaneous goods such as detergents, and others.

[0029]

EXAMPLES The present invention will be described more specifically with reference to examples. Example 1 A paper substrate having a basis weight of 340 g / m ² was used, and a low-density polyethylene resin (density: 0.923 g / c
c, melt index, MI = 3.7, melting point 111
C.) to form a low-density polyethylene resin layer having a thickness of 20 μm. On the other hand, the other surface of the paper substrate is subjected to a corona treatment, and then, a nylon MXD6 resin (density, 1.22 g / cc,
Melt index, MI = 7.0, melting point, 243 ° C.,
80 parts by weight of Mitsubishi Gas Chemical Co., Ltd. and nylon 6 resin (density, 1.14 g / cc, melt index, MI
= 12.9 / 275 ° C dry), a maleic anhydride-modified adhesive polyolefin resin (density, 0.91 g / cc, melt index,
MI = 9.5) and low density polyethylene resin (density,
0.923 g / cc, melt index, MI = 3.
7, melting point 111 ° C.), and co-extruded and laminated in this order to produce a laminated material for forming a paper container having the following layer constitution. (From the outside) Low-density polyethylene resin layer having a thickness of 20 μm / paper base material having a basis weight of 340 g / m ² / blended layer of 80 parts by weight of nylon MXD6 resin and 20 parts by weight of a nylon 6 resin having a thickness of 10 μm / thickness 5 μm adhesive resin layer / thickness 2
0 μm low-density polyethylene resin layer

Example 2 In Example 1 above, the nylon MXD6 resin (density, 1.22 g / cc, melt index, MI =
7.0, melting point, 243 ° C, manufactured by Mitsubishi Gas Chemical Company, Ltd.) 8
0 parts by weight and nylon 6 resin (density, 1.14 g / cc,
Melt index, MI = 12.9 / 275 ° C dr
y) 60 parts by weight of nylon MXD6 resin (density, 1.22 g / cc, melt index, MI = 7.0, melting point, 243 ° C., manufactured by Mitsubishi Gas Chemical Co., Ltd.) instead of the blend consisting of 20 parts by weight And nylon 6 resin (density,
1.14 g / cc, melt index, MI = 12.
9/275 ° C. dry) of 40 parts by weight, except otherwise as in Example 1 above.
A laminated material for forming a paper container having the following layer configuration was manufactured. (From the outside) Low-density polyethylene resin layer having a thickness of 20 μm / paper base material having a basis weight of 340 g / m ² / blended layer of 60 parts by weight of nylon MXD6 resin and 40 parts by weight of nylon 6 resin having a thickness of 10 μm / thickness 5 μm adhesive resin layer / thickness 2
0 μm low-density polyethylene resin layer

COMPARATIVE EXAMPLE 1 A paper base material having a basis weight of 340 g / m ² was used, and a low-density polyethylene resin (density: 0.923 g / c
c, melt index, MI = 3.7, melting point 111
C.) to form a low-density polyethylene resin layer having a thickness of 20 μm. On the other hand, the other surface of the paper substrate is subjected to a corona treatment, and then, a nylon MXD6 resin (density, 1.22 g / cc,
Melt index, MI = 7.0, melting point, 243 ° C.,
A maleic anhydride-modified adhesive polyolefin resin (density, 0.91 g / cc, melt index, MI = 9.5) and a low-density polyethylene resin (density, 0.923 g / cc) , Melt index, MI = 3.7, melting point: 111 ° C.), and co-extruded and laminated in this order to produce a laminated material for forming a paper container having the following layer constitution. (From the outside) Low-density polyethylene resin layer having a thickness of 20 μm / paper base material having a basis weight of 340 g / m ² / nylon MXD6 resin layer having a thickness of 10 μm / adhesive resin layer having a thickness of 5 μm / thickness 2
0 μm low-density polyethylene resin layer

Comparative Example 2 In Example 1 above, the nylon MXD6 resin (density, 1.22 g / cc, melt index, MI =
7.0, melting point, 243 ° C, manufactured by Mitsubishi Gas Chemical Company, Ltd.) 8
0 parts by weight and nylon 6 resin (density, 1.14 g / cc,
Melt index, MI = 12.9 / 275 ° C dr
y) 40 parts by weight of nylon MXD6 resin (density, 1.22 g / cc, melt index, MI = 7.0, melting point, 243 ° C., manufactured by Mitsubishi Gas Chemical Co., Ltd.) instead of the blend consisting of 20 parts by weight And nylon 6 resin (density,
1.14 g / cc, melt index, MI = 12.
9/275 ° C. dry) 60 parts by weight, otherwise the same as in Example 1 above,
A laminated material for forming a paper container having the following layer configuration was manufactured. (From the outside) Low-density polyethylene resin layer having a thickness of 20 μm / paper base material having a basis weight of 340 g / m ² / blended layer layer of 40 parts by weight of nylon MXD6 resin and 60 parts by weight of nylon 6 resin having a thickness of 10 μm / thickness 5 μm adhesive resin layer / thickness 2
0 μm low-density polyethylene resin layer

EXPERIMENTAL EXAMPLE Next, the blanks were manufactured by punching out the laminated material for forming the paper containers produced in Examples 1 and 2 and Comparative Examples 1 and 2 by a predetermined method. Using a blank plate, the bottom 70 cm square, 100
A 0 ml gable-top paper container was formed. next,
Using the paper container manufactured above, a barrier property test was performed under the following measurement conditions. Measurement conditions Ten paper containers were evaluated for the number of pinholes generated in the ruled line portion and the cracks in the ruled line portion using a methylene blue-dyed solution. The testing machine is a modern control
Le barrier testing machine [model name, Oxtran (OX)
TRAN)] under the measurement conditions of 23 ° C. and 90% RH outside the paper container. The measurement results are shown in Table 1 below.

[0034]

[Table 1]

As is clear from the above results, Example 1
-2 were all excellent. In the case of Comparative Example 1, although the barrier property of the case without the pinhole was sufficient, the pinhole at the ruled line portion under the top seal portion was observed in 2 out of 10 samples. Comparative Example 2
Although no cracks were found in the pinholes and the ruled lines, the barrier properties were extremely poor.

[0036]

As is apparent from the above description, the present invention provides a crystalline aromatic polyamide resin having gas barrier properties, high strength, high modulus of elasticity, and heat resistance.
Focusing on having excellent chemical resistance, etc., and also having low water absorption, low moisture permeability, etc., in order to utilize the properties that it has,
On a paper base, directly extruding and laminating a resin composition containing one or more crystalline aromatic polyamide-based resins and one or more aliphatic polyamide-based resins as a main component, and polyamide-based resin Forming a layer, further laminating a thermo-adhesive resin layer as the innermost layer, and producing a laminated material comprising laminating at least a paper base, a polyamide resin layer, and a thermo-adhesive resin layer as the innermost layer Further, using the laminated material, according to a conventional method, manufacture a blank plate capable of manufacturing a paper container, and then manufacture a paper container using the blank plate to manufacture a gas barrier such as oxygen. -Produces excellent packaging products that are excellent in properties, excellent in container strength, heat resistance, etc., suitable for filling and packaging of contents, excellent in storage stability, and suitable for environment. That you can get

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a layer configuration of a laminated material forming a paper container according to the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of a layer configuration of a laminated material forming the paper container according to the present invention.

FIG. 3 is a schematic plan view showing the configuration of a paper container forming blank plate manufactured using the laminated material shown in FIG. 1 or FIG.

FIG. 4 is a schematic perspective view showing a configuration of a paper container forming body manufactured using the paper container forming blank plate shown in FIG. 3;

FIG. 5 is a schematic perspective view showing a configuration of a paper container according to the present invention manufactured using the paper container forming body shown in FIG. 4;

6 is a schematic perspective view showing the configuration of a filled package product in which contents are filled and packed using the paper container according to the present invention shown in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper base material 2 Polyamide resin layer 3 Thermal adhesive resin layer 3 'Thermal adhesive resin layer 4 Adhesion part 5 Side end part 6 Side end seal part 7 Bottom part 8 Contents 9 Roof type seal part A Laminated material A 'Laminated material B Blank plate for forming paper container C Body for forming paper container D Paper container E Filled and packed product l Folded crease

Claims (6)

[Claims] Claims: 1. A paper-based resin layer, a polyamide-based resin layer of a resin composition containing at least one or more crystalline aromatic polyamide-based resins and one or more aliphatic polyamide-based resins as main components, and A paper container characterized by using a laminated material obtained by laminating a heat-adhesive resin layer as the innermost layer, and forming this into a box. 2. A polyamide resin layer comprising a resin composition containing one or more crystalline aromatic polyamide resins and one or more aliphatic polyamide resins as a main component is subjected to biaxial stretching treatment. The paper container according to claim 1, wherein: 3. A polyamide-based resin layer of a resin composition containing one or more crystalline aromatic polyamide-based resins and one or more aliphatic polyamide-based resins as a main component is directly coated on a paper base material. 3. The paper container according to claim 1, wherein the paper container is laminated. 4. A polyamide-based resin layer comprising a resin composition containing, as a main component, one or more crystalline aromatic polyamide-based resins and one or more aliphatic polyamide-based resins, on a paper base material, 4. The paper container according to claim 1, wherein three layers of the adhesive resin layer and the heat adhesive resin layer are simultaneously extruded and laminated. 5. The method according to claim 1, wherein a thermo-adhesive resin layer as an outermost layer is laminated on the paper base opposite to the polyamide resin layer provided on the paper base. Item 1,
The paper container according to 2, 3 or 4. 6. The method according to claim 1, wherein the paper base material has been previously subjected to corona treatment or framing treatment.
6. The paper container according to 2, 3, 4 or 5.