JP2001192018A - Paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container for liquid wherein there is no torrefaction pin hole occurring, the container is excellent in barrier properties for preventing oxygen gas, vapor or the like from permeating, defective sealing, liquid leakage or the like due to generation of the pin hole can be avoided, alteration or the like of contents can be prevented, and the container is excellent in preservability, storage property or the like. SOLUTION: The paper container for a liquid is formed into a box from a laminate material comprising at least a paper base, a barrier layer and a heat-sealable resin layer. Further, the barrier layer comprises a base film equipped with a deposit layer of a metal compound on one of its surfaces. In addition, an adhesive resin layer of 30 to 100 μm is provided between the paper base and the barrier layer comprising the base film equipped with the deposit layer of the metal compound on one of its surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid paper container, and more particularly, to a liquid paper container having an excellent barrier property for preventing permeation of oxygen gas, water vapor, etc. The present invention relates to a liquid paper container which avoids liquid leakage and the like, prevents deterioration of the contents, and has excellent storage stability and storage properties.

[0002]

2. Description of the Related Art Conventionally, liquid paper containers of various forms have been developed for filling and packaging liquid foods and drinks such as sake, juice, mineral water, liquid seasonings, and others.
Proposed. Usually, as a barrier material, a deposited film of a metal compound such as aluminum is provided on one surface of a base film such as a biaxially stretched polyethylene terephthalate film or a biaxially stretched nylon film. A barrier film is used. That is, at least a polyolefin-based resin layer (heat-sealing resin layer) / paper base material / adhesive resin layer / base film provided with a metal compound vapor-deposited film / polyolefin-based resin layer (heat-sealing layer) Laminates in this order to produce a laminated material, and then, using the laminated material, first fold the laminated material and punch a blank plate into a desired shape, In order to prevent permeation of the contents and liquid leakage, the end face is subjected to, for example, skive hemming treatment or the like, and then the seal portion is subjected to framing treatment or hot air. -Processing, etc., and body sticking with a frame seal or hot air seal, etc., to produce a cylindrical sleeve. Next, the tubular sleeve produced as described above is delivered to a manufacturer or the like for filling the contents, and the cylindrical sleeve is supplied to a contents filling machine. Prior to filling, first, the inner surface of the bottom of the tubular sleeve is roasted with hot air, and a press seal is performed to produce a bottom portion. After that, after filling the contents, the inner surface of the top is heated with hot air. A sealed liquid paper container in which contents are filled and packaged by forming a top portion by performing roasting and press-sealing.

[0003]

However, in the production of the above-described liquid paper container, the hot air blown to the inner surface of the top or bottom of the cylindrical sleeve to form the bottom or top is used. As for the temperature, as described above, in the case of a liquid paper container using a base film provided with a vapor-deposited film of a metal compound as a barrier material, depending on the type of a filling machine and the like, it is usually from 310 ° C. 3
A heating temperature seal of about 70 ° C. is performed. However, if heat sealing is performed under conditions exceeding such a seal temperature, a roasting pin hole is formed on the inner surface of the laminated material constituting the paper container. However, there is a problem that it occurs very easily, and there is a problem that its temperature control is extremely difficult. Thus, when a hot pinhole such as a roasted pinhole is generated as described above, seal failure, liquid leakage, and the like are generated, and along with this, the contents are deteriorated and the storage stability, storage stability, etc. are stabilized. Lack of gender, and in some cases,
There is a problem that the value of the product is significantly reduced and the product must be discarded. By the way, as a pin hole generated in a paper container, a laminated material is generally used, and the laminated material is subjected to creasing or the like, and is formed when a blank plate is punched into a desired shape. There is known a roasting pinhole or the like generated when roasting the top and bottom of a tubular sleeve with hot air when filling the contents or contents. The above-mentioned roasted pinhole will be described in more detail below, including the process of its generation. As mentioned above, in box making, first, to form the top or bottom of the paper container,
Hot air is blown from the outlet of the heating chamber onto the inner surface of the top or bottom of the cylindrical sleeve. By the way, the hot air blown to the inner surface of the top or bottom of the cylindrical sleeve is a polyolefin-based resin layer (heat-sealing resin layer) on the inner surface.
Is melted, and the heat by hot air reaches the paper base, heats the paper base, and thereby heats the paper base. Is heated, the moisture contained in the paper base material is heated, and this is turned into a vapor and tends to escape to the inner and outer surfaces of the laminated material, thereby being laminated on the inner and outer surfaces of the paper base material. It shows a foaming phenomenon in which a resin film is pushed up and swelled. Furthermore, when heat from hot air is applied, the resin film on the inner surface side laminated on the paper base material cannot withstand the vapor pressure due to evaporation of moisture, and the swelled resin film is torn, thereby causing the broiling. It is believed that pinholes occur. For example, a structure in which a low-density polyethylene resin layer, a paper substrate, an adhesive polyethylene resin layer, a biaxially stretched polyethylene terephthalate film provided with a metal compound vapor-deposited film, a low-density polyethylene film, and the like are sequentially laminated from the outer surface side. In a liquid paper container manufactured using a laminated material consisting of
When observing the above-described process of generating the roasted pinhole, as in the above, first, in the initial stage, in the adhesive polyethylene resin layer, it swells to generate a foaming phenomenon, and the metal compound is formed so that the swelling occurs. A biaxially stretched polyethylene terephthalate film provided with a vapor-deposited film and a low-density polyethylene film swell and foam, and finally, the swelled and foamed air bubbles burst to generate a roasted pinhole. You can be sure that. Therefore, the present invention eliminates the occurrence of the above-mentioned roasted pinholes and the like, and has an excellent barrier property for preventing permeation of oxygen gas, water vapor and the like. An object of the present invention is to provide a liquid paper container which avoids leakage and the like, prevents deterioration of contents and the like, and is excellent in storability and storability.

[0004]

The present inventor has conducted various studies to prevent the occurrence of roasting pinholes in the above-described liquid paper container. As a result, at least the paper base material, the barrier layer, and the heat sink were obtained. -A laminated material comprising a resinous layer,
The barrier layer comprises a base film provided with a metal compound vapor-deposited film on one surface thereof, and the paper substrate and a base film provided with a metal compound vapor-deposited film on one surface thereof. 30-100 μm between the barrier layer and
Manufacturing a laminated material having a configuration provided with an adhesive resin layer of
Using this, first, the laminated material is subjected to creases and the like, and a blank plate is punched into a desired shape.
For example, an end face process is performed by performing a skive hemming process or the like, and then a frame process or a
Hot air treatment, etc. to perform frame seal or
A cylindrical sleeve is manufactured by sticking the body with a hot air seal or the like, and then the cylindrical sleeve manufactured as described above is supplied to a content filling machine. Prior to filling, first, the inner surface of the bottom of the tubular sleeve is roasted with hot air, and the bottom is manufactured by press sealing.
Next, after filling the contents, the inner surface of the top was roasted with hot air and press-sealed to form a top portion to produce a sealed liquid paper container in which the contents were filled and packaged. It has excellent barrier properties to prevent the permeation of water, furthermore, eliminates the occurrence of roasting pinholes, avoids seal failure, liquid leakage, etc., and prevents deterioration of the contents, as well as storage and storage properties. The present invention has been completed by finding that an excellent liquid paper container can be manufactured.

[0005] That is, the present invention is a liquid paper container obtained by producing a laminate comprising at least a paper base material, a barrier layer and a heat-sealing resin layer. The layer is composed of a base film having a metal compound vapor-deposited film on one surface thereof, and has a barrier property comprising the above-described paper substrate and a substrate film having a metal compound vapor-deposited film provided on one surface thereof. The present invention relates to a liquid paper container provided with an adhesive resin layer of 30 to 100 μm between layers.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The above-mentioned present invention will be described below in more detail with reference to the drawings and the like. First, a description will be given of a configuration of a laminated material and the like constituting a liquid paper container according to the present invention with reference to the drawings by exemplifying 12 examples, with reference to FIGS.
FIG. 1 is a schematic cross-sectional view showing a layer configuration of an example of a laminate constituting a liquid paper container according to the present invention. next,
The configuration of the liquid paper container according to the present invention will be described with reference to the drawings by exemplifying one example. FIGS. 3, 4, 5, and 6 use the laminated material shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which shows the structure of the liquid paper container in each box making process which shows the structure of the box manufacturing process about the box manufacturing of the liquid paper container concerning this invention.

As shown in FIG. 1, the laminated material A constituting the liquid paper container according to the present invention comprises at least a paper base material 1, a barrier layer 2, and a heat-sealing resin layer 3, Further, the barrier layer 1 is composed of a base film 5 having a metal compound vapor-deposited film 4 on one surface thereof, and the paper substrate 1 and an inorganic oxide vapor-deposited on one surface thereof. The basic structure is such that an adhesive resin layer 6 having a thickness of 30 to 100 μm is provided between the barrier layer 2 and the base film 5 provided with the film 4. Further, another example of the laminated material constituting the liquid paper container according to the present invention will be described. As shown in FIG. 2, a paper base material constituting the laminated material A in the laminated material A shown in FIG. A laminate A1 having a configuration in which a heat-sealing resin layer 3a is further provided on the other surface of the laminate ₁ can be exemplified. Note that, in FIG. 2 described above, reference numerals 2, 3, 4, 5, 6, and the like have the same meanings as those described above with reference to FIG.

[0008] The above-mentioned examples illustrate only 12 examples of the laminated material constituting the liquid paper container according to the present invention, and the present invention is not limited thereto.
For example, in the present invention, although not shown, in the configuration of the laminated material as described above, a paper base and a base film provided with a vapor-deposited film of a metal compound on one surface thereof are formed on the surface of the paper base. Alternatively, any one of the surface of the metal compound vapor-deposited film and the surface of the base film may be faced and laminated. Also, for example, in the present invention, although not shown,
As the metal compound vapor-deposited film provided on one surface of the base film, not only a single layer film composed of one layer of the metal compound vapor-deposited film but also a multilayer composed of two or more layers of the same or different metal compound vapor-deposited films Depending on the purpose of packaging the liquid paper container according to the present invention, the contents to be filled and packed, the purpose of use, the application, etc.,
Other substrates can be arbitrarily laminated to design and manufacture laminated materials having various forms.

Next, in the present invention, the configuration of the liquid paper container according to the present invention will be described by way of an example. The case of using the laminated material A shown in FIG. 1 will be described. As shown in FIG. 1, first, the laminated material A shown in FIG. 1 is used, and the laminated material A is folded vertically, horizontally or diagonally according to the shape of a desired liquid paper container.
The blank plate B having the glue margin 12 and the like is manufactured by engraving 1 and stamping. Next, as shown in FIG. 4, the end face of the blank plate B manufactured as described above is subjected to, for example, skive hemming treatment or the like in order to prevent permeation of the contents, liquid leakage, and the like. After performing the processing, the glue margin 12 (see FIG. 3) is subjected to a frame treatment or a hot air treatment, and the heat sealable resin layer 3 (see FIGS. 2) is melted, and the other end 13 of the blank plate B (see FIG. 3) is superimposed on the melted surface to form a frame seal or The body-sealed seal portion 14 is formed by a hot air seal or the like, and a tubular sleeve C is manufactured. Next, as shown in FIG. 5, the tubular sleeve C produced as described above is delivered to a manufacturer or the like for filling the contents.
The cylindrical sleeve C is supplied to a contents filling machine (not shown), and then, before filling the contents, first, the inner surface of the bottom of the cylindrical sleeve C is roasted by hot air. The heat-sealing resin constituting the heat-sealing resin layer on the inner surface thereof is melted and press-sealed to form a bottom seal portion 15, and an opening 16 is formed upward. Is manufactured. Thereafter, as shown in FIG. 6, after filling the contents 17 from the opening 16 of the packaging container D,
The inner surface of the top is roasted with hot air, and the heat-sealing resin constituting the heat-sealing resin layer on the inner surface is melted.
The sealed liquid paper container E according to the present invention, in which the contents 17 are filled and packaged, is manufactured. The above-mentioned illustration is an example of the liquid paper container according to the present invention, and the present invention is not limited thereto. For example, in the present invention, although not shown,
The shape of the liquid paper container according to the present invention can be any shape such as a block type, a cylindrical type, and the like.

Next, in the present invention, the material constituting the liquid paper container according to the present invention and the production method thereof will be described in more detail. First, as the paper base material constituting the liquid paper container according to the present invention, Since this is a basic material constituting a paper container, it is possible to use a material having moldability, bending resistance, rigidity, waist, strength, etc. Material or pure white roll paper,
Various paper substrates such as kraft paper, paperboard, processed paper, and others can be used. In the present invention, as the paper base material, one having a basis weight of about 80 to 600 g / m ² , preferably one having a basis weight of about 100 to 450 g / m ² can be used. In the present invention, a desired printed pattern such as a character, a figure, a pattern, a symbol, and the like can be arbitrarily formed on the paper substrate by a normal printing method.

Next, in the present invention, a base film provided with a metal compound vapor-deposited film on one surface as a barrier layer constituting the liquid paper container or the like according to the present invention will be described. Since the film is provided with a vapor-deposited film of a metal compound, it has excellent properties in mechanical, physical, chemical, etc., and in particular, it has strength, toughness, and heat resistance. Or a resin film or sheet having the following formula: In particular,
In the present invention, as the base film, for example, polyethylene resin, polypropylene resin, cyclic polyolefin resin, fluorine resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene Copolymer (AB
S resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resin such as polyethylene terephthalate, polyethylene naphthalate, and various nylons Polyamide resin, polyimide resin, polyamide imide resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyether sulfone resin, polyurethane resin, aceta Films or sheets of various resins such as cellulose resin, cellulose resin and others can be used. In the present invention, it is particularly preferable to use a film or sheet of a polypropylene resin, a polyester resin, or a polyamide resin.

In the present invention, as the film or sheet of the above-mentioned various resins, for example, one or more of the above-mentioned various resins are used, and are extruded, cast-formed, T-die-processed, and cut. A method of forming the above various resins alone using a film forming method such as an inflation method, an inflation method, or the like, or a multi-layer coextrusion film forming using two or more kinds of resins. A film or sheet of various resins is manufactured by a method of forming two or more resins, and a method of mixing and forming a film before forming a film. For example, various resin films or sheets stretched in a uniaxial or biaxial direction using a tenter method or a tuber method can be used. In the present invention, the film thickness of various resin films or sheets is 6 to 100 μm.
And more preferably about 9 to 50 μm.

When one or more of the above various resins are used and the film is formed, for example, the processability, heat resistance, weather resistance, mechanical properties, dimensional stability,
For the purpose of improving or modifying the antioxidant properties, slip properties, mold release properties, flame retardancy, anti-mold properties, electrical properties, strength, etc., various plastic additives and additives can be added. Can,
The addition amount can be arbitrarily added from a very small amount to several tens% depending on the purpose. In the above, as a general additive, for example, a lubricant, a crosslinking agent,
Antioxidants, ultraviolet absorbers, light stabilizers, fillers, antistatic agents, lubricants, antiblocking agents, coloring agents such as dyes and pigments, and the like can be used. Can also be used.

In the present invention, if necessary, the surface of the film or sheet of the above-mentioned various resins may be prepared in advance in order to improve the tight adhesion to a metal compound vapor-deposited film described later. And a desired surface treatment layer. In the present invention, as the surface treatment layer, for example, corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using a chemical, etc., Pretreatment such as others can be arbitrarily performed, and for example, a corona treatment layer, an ozone treatment layer, a plasma treatment layer, an oxidation treatment layer, and the like can be formed and provided. The above surface pretreatment is carried out as a method for improving the tight adhesion between a film or sheet of various resins and a deposited film of a metal compound described later. Other methods for improvement include, for example, various resin films or sheets.
A primer coat agent layer, an undercoat agent layer, an anchor coat agent layer, an adhesive layer, or
A surface treatment layer may be formed by arbitrarily forming a deposition anchor coating agent layer or the like. Examples of the coating agent layer for the above pretreatment include polyester resin, polyamide resin, polyurethane resin, epoxy resin, phenol resin, (meth) acrylic resin, polyvinyl acetate resin, A resin composition containing a polyolefin resin such as polyethylene or polypropylene or a copolymer or modified resin thereof, a cellulose resin, or the like as a main component of the vehicle can be used.

Next, in the present invention, a metal compound vapor-deposited film provided on one surface of a base film as a barrier layer constituting the liquid paper container or the like according to the present invention will be described. For example, a single-layer film composed of one layer of a metal compound vapor-deposited film, or a multilayer film or a composite film composed of two or more layers can be formed by using a physical vapor deposition method or the like. is there.

In the present invention, the metal compound vapor-deposited film formed by the physical vapor deposition method will be described in more detail. The metal compound vapor-deposited film formed by the physical vapor deposition method is, for example, a vacuum vapor deposition method, a sputtering method, or the like. Physical vapor deposition methods such as an ion plating method and an ion cluster beam method (Physical Vapor Depth)
An evaporation method of a metal compound can be formed by using an oxidation method or a PVD method. In the present invention, specifically, a metal compound such as aluminum is used as a raw material, which is heated and vaporized, and is vapor-deposited on one of the substrate films, using a vacuum vapor deposition method of forming a film. A deposited film of a metal compound can be formed. In the above, as a heating method of the evaporation material, for example, a resistance heating method, a high-frequency induction heating method, an electron beam heating method (EB), or the like can be used.

In the present invention, a specific example of a method for forming a metal compound vapor-deposited film by physical vapor deposition is shown in FIG. 7. FIG. 7 is a schematic configuration diagram showing an example of a roll-up type vacuum vapor deposition apparatus. is there. As shown in FIG. 7, in a vacuum chamber 22 of a take-up type vacuum evaporation apparatus 21, a base film 5 unwound from an unwinding roll 23 is cooled through guide rolls 24 and 25. -Guided to the ding drum 26; Thus, on the substrate film 5 guided on the cooled coating drum 26,
An evaporation source 28 heated by the crucible 27, for example, metal aluminum or the like is evaporated, and the vapor is applied to masks 29, 29.
Then, for example, a deposited film of a metal compound such as aluminum is formed into a film, and then, in the above, the base film 5 on which the deposited film of a metal compound such as aluminum is formed is connected to the guide rolls 25 ′ and 24. ′
By winding the film on the winding roll 30, a vapor-deposited film of a metal compound can be formed by the physical vapor deposition method according to the present invention. Note that, in the present invention, the above-described roll-up type vacuum evaporation apparatus is used to first form a first layer of a metal compound vapor-deposited film, and then, in the same manner, on the metal compound vapor-deposited film. Further, a metal compound vapor-deposited film is further formed, or a roll-up type vacuum vapor-deposition device as described above is used to connect the two in series, and a metal compound vapor-deposited film is continuously formed. This makes it possible to form a metal compound vapor-deposited film composed of two or more multilayer films.

In the above description, as the metal compound vapor-deposited film, basically any thin film on which a metal compound is vapor-deposited can be used. For example, silicon (Si), aluminum (A)
l), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium ( A deposited film of a metal compound such as Y) can be used. Thus, a preferable example is a deposited film of a metal compound such as aluminum (Al). In the present invention, the thickness of the above-mentioned metal compound vapor-deposited film varies depending on the type of the metal compound to be used and the like.
It is desirable to arbitrarily select and form it within the range of 100 to 1000 °. Further, in the present invention, as the metal compound to be used as the metal compound vapor deposition film, one type or a mixture of two or more types may be used, and a metal compound vapor deposition film mixed with different materials may be used. .

Next, in the present invention, the adhesive resin layer constituting the liquid paper container according to the present invention will be described. The adhesive resin layer is for tightly bonding the paper base material and the barrier layer. Yes, for example, various resins that can be melted by heat and can be fused to each other can be used. Specifically, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) Low density polyethylene, ethylene polymerized using metallocene catalyst
α-olefin copolymer, 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 Modification of polyolefin-based resin such as methylpentene polymer, polybutene polymer, polyethylene or polypropylene with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid Resins such as polyolefin resin, polyvinyl acetate resin, poly (meth) acrylic resin, polyvinyl chloride resin and others can be used. Thus, in the present invention, as the adhesive resin layer,
For example, using an extruder or the like, one or more of the above resins are extruded into a single layer or a multilayer between the paper base and the barrier layer to form a melt-extruded resin film or the like. ,
The paper base and the barrier layer can be laminated via the melt-extruded resin layer. In the present invention, the thickness of the adhesive resin layer is 3
0 μm to 100 μm, preferably 30 μm to 60 μm
The m-th position is desirable. In the above, when the film thickness is 3
When the thickness is less than 0 μm, it is not preferable because roasted pinholes tend to be easily generated.
If it exceeds m, the moldability of the bottom portion and the top portion becomes extremely poor, which is not preferable.

Further, in the present invention, as the heat-sealing resin constituting the heat-sealing resin layer constituting the liquid paper container etc. according to the present invention, for example, the heat-sealing resin which is melted by heat, Various resins that can be fused to can be used. Specifically, for example, similar to the above, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, Ethylene-α-olefin copolymer polymerized using a metallocene catalyst, 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 a polyolefin resin such as polyethylene or polypropylene with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and polyvinyl acetate resin. Resins such as poly (meth) acrylic resin, polyvinyl chloride resin, heat-sealable polyester resin having fragrance retention, polyacrylonitrile resin, and the like can be used. Thus, in the present invention, one of the above resins is used.
Using a seed or two or more, melt extrusion using an extruder or the like, for example, by melt extrusion lamination on the other surface of the paper substrate, or the surface of the barrier layer,
Alternatively, one or more of the above resins are used, and a resin film or sheet is manufactured in advance from the resin, and the resin film or sheet is transferred to the other surface of the paper substrate, Alternatively, a heat sealable resin layer can be formed by laminating a dry laminate on the surface of the barrier layer or the like via an adhesive layer for laminate or the like. In the present invention, the thickness of the heat-sealing resin layer is about 5 to 200 μm, preferably 10 to 100 μm.
The m-th position is desirable.

In the present invention, as a material for forming the laminated material constituting the liquid paper container according to the present invention, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene having a barrier property against water vapor, water, etc. Films or sheets of resins such as linear (linear) low-density polyethylene, polypropylene and ethylene-propylene copolymer, or polyvinylidene chloride resins having a barrier property against oxygen, water vapor, etc., polyvinyl Alcohol-based resin, ethylene-vinyl alcohol copolymer, M
XD polyamide-based resin, polynaphthalene terephthalate-based resin film or sheet, resin, a coloring agent such as a pigment, and other desired additives are added and kneaded to form a light-shielding property. Various colored resin films or sheets having the following 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 is usually about 5 μm to 300 μm,
Further, the thickness is preferably about 10 μm to 100 μm.

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 resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyester resin, polyamide resin, polycarbonate 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 the present invention, the above-mentioned film or sheet may be any of unstretched and uniaxially or biaxially stretched. The thickness is arbitrary, but can be selected from a range of several μm to 300 μm. Further, in the present invention, as the film or sheet, extrusion film formation,
Any film such as an inflation film or a coating film may be used. In addition, for example, a film such as cellophane, synthetic paper, or the like can be used.

Next, in the present invention, a desired printed pattern layer can be formed between any of the layers forming the laminated material constituting the liquid paper container according to the present invention. Thus, the above-mentioned print pattern layer contains one or more kinds of ordinary ink vehicles as main components,
If necessary, plasticizers, stabilizers, antioxidants, light stabilizers,
UV absorbers, curing agents, cross-linking agents, lubricants, antistatic agents, fillers, arbitrarily add one or more of additives such as other, further, colorants such as dyes and pigments, solvent,
The ink composition is adjusted by sufficiently kneading with a diluent or the like, and then using the ink composition, for example, gravure printing,
Using a printing method such as offset printing, letterpress printing, screen printing, transfer printing, flexographic printing, etc., a desired printing pattern consisting of characters, figures, symbols, patterns, etc. on the above-mentioned coating thin film. Can be printed to form a printed pattern layer according to the present invention.

In the present invention, a method of manufacturing a laminated material using the above-described materials will be described.
Examples of such a method include laminating ordinary packaging materials, for example, wet lamination, dry lamination, solventless dry lamination, extrusion lamination, T-die extrusion molding, and the like. It can be performed by an extrusion lamination method, an inflation method, a co-extrusion inflation method, or the like.
Thus, in the present invention, when performing the above-mentioned lamination, if necessary, a pretreatment such as a corona treatment, a plasma treatment, an ozone treatment, or the like can be optionally performed. -Anchoring agents such as urethane-based, urethane-based, polyethyleneimine-based, polybutadiene-based, and organic titanium-based, or polyurethane-based,
Any known anchor coating agent such as polyacrylic, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, etc. laminating adhesive, laminating adhesive, etc. Can be used.

Next, in the present invention, as the liquid paper container according to the present invention, for example, a liquid paper container of a brick type, a flat type or a gable-top type can be manufactured. Moreover, the shape can be manufactured by any of a rectangular container, a circular or other cylindrical paper can, and the like.

In the present invention, the liquid paper container according to the present invention is filled with various articles such as various foods and drinks, chemicals such as adhesives and adhesives, miscellaneous goods such as cosmetics and pharmaceuticals, and the like. It can be packaged. Thus, in the present invention, the liquid paper container according to the present invention is particularly suitable for liquid seasonings such as juices, juice drinks and other juices, mineral water, soy sauce, sauces, soups and the like. Fees or
It is useful as a packaging container for filling and packaging various liquid foods and drinks such as curry, stew, soup and others.

[0027]

EXAMPLES The present invention will be described more specifically with reference to examples. Example 1 (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm was used, which was mounted on a delivery roll of a take-up type vacuum evaporation apparatus, and then fed out onto a coating drum to perform corona treatment. On the surface, a 200- [mu] m-thick aluminum vapor-deposited film was formed by vacuum vapor deposition using an electron beam (EB) heating method under the following conditions, using aluminum as a vapor deposition source. (Evaporation conditions) Evaporation source: Aluminum Degree of vacuum in vacuum chamber: 7.5 × 10 ⁻⁶ mbar Degree of vacuum in evaporation chamber: 2.1 × 10 ⁻⁶ mbar EB output: 40 KW Film transport speed: 600 m / Next, after the above-described 200-nm-thick aluminum vapor-deposited film is formed, immediately after the vapor-deposition, a plasma output of 1500 W and oxygen gas ( O ₂ ): Using a mixed gas of argon gas (Ar) = 19: 1, performing a plasma treatment with an oxygen / argon mixed gas at a mixed gas pressure of 6 × 10 ⁻⁵ Torr and a processing speed of 420 m / min. Surface was formed. (2). Next, on one side of the plasma-treated surface of the aluminum vapor-deposited film manufactured in the above (1),
The surface of a paper substrate having a basis weight of 400 g / m ² provided with a low-density polyethylene resin layer having a thickness of 20 μm is opposed to each other, and a low-density polyethylene is used between the surfaces. A biaxially stretched polyethylene terephthalate film having an aluminum vapor-deposited film and a paper substrate were melt-extruded and laminated via a 40 μm low-density polyethylene resin layer. (3). Further, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in the above (2) is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor coating agent layer, which is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. A low-density polyethylene film having a thickness of 40 μm was melt-extruded and laminated by lamination to produce a laminated material according to the present invention having the following layer constitution. Low-density polyethylene resin layer / paper substrate / low-density polyethylene resin layer / aluminum vapor-deposited film / biaxially stretched polyethylene terephthalate film / anchor coating agent layer / low-density polyethylene resin layer / low-density polyethylene film (4 ). Then, using the laminated material produced above,
In accordance with the shape of the bell-top type liquid paper container, a scribe is engraved vertically or horizontally or diagonally and punched to produce a blank plate having a margin for glue,
The end face of the blank plate manufactured as described above is subjected to skive hemming treatment to prevent permeation of contents, liquid leakage, and the like, and then the end face treatment is performed. The low-density polyethylene resin or the like in the glue margin is melted, the other end of the blank plate is superimposed on the melted surface, and a body sealing seal is formed by a frame seal to form a cylindrical shape. A sleeve was manufactured. Next, the inner surface of the bottom of the tubular sleeve produced above is roasted with hot air, the low-density polyethylene resin on the inner surface is melted, and a press seal is performed to form a bottom seal portion. Then, after filling the juice juice from the other opening, the inner surface of the top is roasted with hot air, the low-density polyether resin on the inner surface is melted, and a press seal is performed to perform a gauber top seal.
A sealed liquid paper container according to the present invention in which a container is formed and contents are filled and packaged is manufactured. The sealed liquid paper container produced above does not show any occurrence of roasting pinholes, etc., and furthermore has excellent barrier properties against oxygen gas, water vapor, etc., and also has excellent fragrance retention, and its contents are not deteriorated. It was not recognized, was excellent in laminate strength, etc., endured distribution in the market, and was excellent in storage and preservation.

Embodiment 2 (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having a vapor deposition film of aluminum manufactured in Example 1 above was used, and a film having a thickness of 20 μm was previously formed on one surface of the aluminum vapor deposition film. The surface of a paper substrate having a basis weight of 400 g / m ² provided with a low-density polyethylene resin layer is opposed to the surface of the paper substrate, and between them, low-density polyethylene and an ethylene-methacrylic acid copolymer are used, and they are melted. Biaxially stretched polyethylene terephthalate film having a vapor-deposited aluminum film via a 40 μm-thick multilayer co-extruded resin layer comprising a low-density polyethylene resin layer and an ethylene-methacrylic acid copolymer layer. And a paper substrate were melt-extruded and laminated. (2). Further, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in (1) above is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor coating agent layer, which is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. A low-density polyethylene film having a thickness of 40 μm was melt-extruded and laminated by lamination to produce a laminated material according to the present invention having the following layer constitution. Low-density polyethylene resin layer / paper substrate / multi-layer co-extruded resin layer / aluminum vapor-deposited film / biaxially-stretched polyethylene terephthalate film / anchor coating agent layer / low-density polyethylene resin layer / low-density polyethylene film (3 ). Then, using the laminated material produced above, a blank plate was formed, a tubular sleeve was formed, a bottom seal portion was formed, and the content was changed in the same manner as in Example 1 above. The sealed liquid paper container according to the present invention was manufactured through filling, formation of a gabelle top seal part, and the like. The sealed liquid paper container produced above does not show any occurrence of roasting pinholes, etc., and furthermore has excellent barrier properties against oxygen gas, water vapor, etc., and also has excellent fragrance retention, and its contents are not deteriorated. It was not recognized, was excellent in laminate strength, etc., endured distribution in the market, and was excellent in storage and preservation.

Embodiment 3 (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having an aluminum vapor-deposited film produced in Example 1 was used, and the aluminum-deposited film was previously coated on one side with a plasma-treated surface. 20
400 g basis weight with low-density polyethylene resin layer of μm
/ M ² paper base material facing each other, and between the layers,
A low-density polyethylene was melt-extruded, and a biaxially stretched polyethylene terephthalate film having a vapor-deposited aluminum film and a paper substrate were melt-extruded and laminated via a low-density polyethylene resin layer having a thickness of 40 μm. . (2). Next, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in (1) above is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor coating agent layer, which is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. A 40 μm thick linear low-density polyethylene film made of an ethylene-α-olefin copolymer was melt-extruded and laminated to obtain a laminated material according to the present invention having the following layer constitution. Low-density polyethylene resin layer / paper substrate / low-density polyethylene resin layer / aluminum vapor-deposited film / biaxially stretched polyethylene terephthalate film / anchor coating agent layer / low-density polyethylene resin layer /
Linear low density polyethylene film (3). Then, using the laminated material produced above, a blank plate was formed, a tubular sleeve was formed, a bottom seal portion was formed, and the content was changed in the same manner as in Example 1 above. The sealed liquid paper container according to the present invention was manufactured through filling, formation of a gabelle top seal part, and the like. The sealed liquid paper container produced above does not show any occurrence of roasting pinholes, etc., and furthermore has excellent barrier properties against oxygen gas, water vapor, etc., and also has excellent fragrance retention, and its contents are not deteriorated. It was not recognized, was excellent in laminate strength, etc., endured distribution in the market, and was excellent in storage and preservation.

Embodiment 4 (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having an aluminum vapor-deposited film produced in Example 1 was used, and the aluminum-deposited film was previously coated on one side with a plasma-treated surface. 20
400 g basis weight with low-density polyethylene resin layer of μm
/ M ² paper base material facing each other, and between the layers,
A low-density polyethylene was melt-extruded, and a biaxially stretched polyethylene terephthalate film having a vapor-deposited aluminum film and a paper substrate were melt-extruded and laminated via a low-density polyethylene resin layer having a thickness of 40 μm. . (2). Next, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in (1) above is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor coating agent layer, which is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. A low-density polyethylene film layer having a thickness of 20 μm and a thickness of 20 μm using a low-density polyethylene and an ethylene-α-olefin copolymer.
A multilayer coextruded laminated film having a thickness of 40 μm comprising an ethylene-α-olefin copolymer film layer having a thickness of μm was melt-extruded and laminated to produce a laminated material according to the present invention having the following layer constitution. Low-density polyethylene resin layer / paper base material / low-density polyethylene resin layer / aluminum vapor-deposited film / biaxially-stretched polyethylene terephthalate film / anchor coating agent layer / low-density polyethylene resin layer / multilayer co-extruded laminated film ( 3). Then, using the laminated material produced above, a blank plate was formed, a tubular sleeve was formed, a bottom seal portion was formed, and the content was changed in the same manner as in Example 1 above. The sealed liquid paper container according to the present invention was manufactured through filling, formation of a gabelle top seal part, and the like. The sealed liquid paper container produced above does not show any occurrence of roasting pinholes, etc., and furthermore has excellent barrier properties against oxygen gas, water vapor, etc., and also has excellent fragrance retention, and its contents are not deteriorated. It was not recognized, was excellent in laminate strength, etc., endured distribution in the market, and was excellent in storage and preservation.

Embodiment 5 (1). Using a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having a vapor-deposited aluminum film produced in Example 1 above, a two-component curing type polyurethane laminating film was applied to the plasma-treated surface of the vapor-deposited aluminum film. Using a gravure roll
The coating method was applied to a thickness of 4.5 g / m ² (dry state) by a coating method to form an adhesive layer for laminate,
Next, a low-density polyethylene film having a thickness of 20 μm was dry-laminated on the surface of the laminating adhesive layer. (2). Next, the thickness 2 of the dry laminate laminated above
On a surface of a 0 μm low-density polyethylene film, a surface of a paper substrate having a basis weight of 400 g / m ² provided with a low-density polyethylene resin layer having a thickness of 20 μm on one surface in advance, In the meantime, a low-density polyethylene is used, and while this is melt-extruded, a biaxially stretched polyethylene terephthalate film having a vapor-deposited aluminum film and a paper substrate are melted through a low-density polyethylene resin layer having a thickness of 20 μm. Extruded and laminated. (3). Further, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in the above (2) is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor coating agent layer, which is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. A low-density polyethylene film having a thickness of 40 μm was melt-extruded and laminated by lamination to produce a laminated material according to the present invention having the following layer constitution. Low-density polyethylene resin layer / Paper base material / Low-density polyethylene resin layer / Low-density polyethylene film / Laminate adhesive layer / Evaporated aluminum film / biaxially oriented polyethylene terephthalate film / Anchor coating agent layer / Low density polyethylene resin layer / Low density polyethylene film (4). Then, using the laminated material produced above, a blank plate was formed, a tubular sleeve was formed, a bottom seal portion was formed, and the content was changed in the same manner as in Example 1 above. The sealed liquid paper container according to the present invention was manufactured through filling, formation of a gabelle top seal part, and the like. The sealed liquid paper container produced above does not show any occurrence of roasting pinholes, etc., and furthermore has excellent barrier properties against oxygen gas, water vapor, etc., and also has excellent fragrance retention, and its contents are not deteriorated. It was not recognized, was excellent in laminate strength, etc., endured distribution in the market, and was excellent in storage and preservation.

Embodiment 6 (1). Using a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having a vapor-deposited aluminum film produced in Example 1 above, a two-component curing type polyurethane laminating film was applied to the plasma-treated surface of the vapor-deposited aluminum film. Using a gravure roll
The coating method was applied to a thickness of 4.5 g / m ² (dry state) by a coating method to form an adhesive layer for laminate,
Next, a 15 μm-thick ethylene-vinyl alcohol copolymer film was dry-laminated on the surface of the laminating adhesive layer. (2). Next, the thickness of the dry laminate laminated above 1
On a surface of a 5 μm-thick ethylene-vinyl alcohol copolymer film, a low-density polyethylene resin layer having a thickness of 20 μm was provided on one surface in advance, and a paper substrate having a basis weight of 400 g / m ² was prepared. The surfaces are opposed to each other, and between them, low-density polyethylene is used.
A biaxially stretched polyethylene terephthalate film having a vapor-deposited aluminum film and a paper substrate were melt-extruded and laminated via a low-density polyethylene resin layer of m. (3). Further, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in the above (2) is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor coating agent layer, which is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. A low-density polyethylene film having a thickness of 40 μm was melt-extruded and laminated by lamination to produce a laminated material according to the present invention having the following layer constitution. Low-density polyethylene resin layer / Paper base material / Low-density polyethylene resin layer / Ethylene-vinyl alcohol copolymer film / Laminate adhesive layer / Evaporated aluminum film / biaxially stretched polyethylene terephthalate film / Anchor Coating agent layer / low density polyethylene resin layer / low density polyethylene film (4). Then, using the laminated material produced above, a blank plate was formed, a tubular sleeve was formed, a bottom seal portion was formed, and the content was changed in the same manner as in Example 1 above. The sealed liquid paper container according to the present invention was manufactured through filling, formation of a gabelle top seal part, and the like. The sealed liquid paper container produced above does not show any occurrence of roasting pinholes, etc., and furthermore has excellent barrier properties against oxygen gas, water vapor, etc., and also has excellent fragrance retention, and its contents are not deteriorated. It was not recognized, was excellent in laminate strength, etc., endured distribution in the market, and was excellent in storage and preservation.

Comparative Example 1 (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having an aluminum vapor-deposited film produced in Example 1 was used, and the aluminum-deposited film was previously coated on one side with a plasma-treated surface. 20
400 g basis weight with low-density polyethylene resin layer of μm
/ M ² paper base material facing each other, and between the layers,
Using low-density polyethylene, a biaxially stretched polyethylene terephthalate film having a vapor-deposited aluminum film and a paper substrate were melt-extruded and laminated through a low-density polyethylene resin layer having a thickness of 20 μm while being melt-extruded. . (2). Further, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in (1) above is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor coating agent layer, which is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. A low-density polyethylene film having a thickness of 40 μm was melt-extruded and laminated by lamination to produce a laminated material having the following layer structure. Low-density polyethylene resin layer / paper substrate / low-density polyethylene resin layer / aluminum vapor-deposited film / biaxially stretched polyethylene terephthalate film / anchor coating agent layer / low-density polyethylene resin layer / low-density polyethylene film (3 ). Then, using the laminated material produced above, a blank plate was formed, a tubular sleeve was formed, a bottom seal portion was formed, and the content was changed in the same manner as in Example 1 above. A sealed liquid paper container was manufactured through filling, formation of a gabelle top seal part, and the like.

Comparative Example 2 (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having an aluminum vapor-deposited film produced in Example 1 was used, and the aluminum-deposited film was previously coated on one side with a plasma-treated surface. 20
400 g basis weight with low-density polyethylene resin layer of μm
/ M ² paper base material facing each other, and between the layers,
Using low-density polyethylene, a biaxially stretched polyethylene terephthalate film having a vapor-deposited aluminum film and a paper substrate were melt-extruded and laminated through a low-density polyethylene resin layer having a thickness of 20 μm while being melt-extruded. . (2). Next, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in (1) above is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor coating agent layer, which is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. Then, a linear low-density polyethylene film made of an ethylene-α-olefin copolymer having a thickness of 40 µm was melt-extruded and laminated by lamination to produce a laminated material having the following layer constitution. Low-density polyethylene resin layer / paper substrate / low-density polyethylene resin layer / aluminum vapor-deposited film / biaxially stretched polyethylene terephthalate film / anchor coating agent layer / low-density polyethylene resin layer / linear low-density polyethylene film (3). Then, using the laminated material produced above, a blank plate was formed, a tubular sleeve was formed, a bottom seal portion was formed, and the content was changed in the same manner as in Example 1 above. A sealed liquid paper container was manufactured through filling, formation of a gabelle top seal part, and the like.

Comparative Example 3 (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having an aluminum vapor-deposited film produced in Example 1 was used, and the aluminum-deposited film was previously coated on one side with a plasma-treated surface. 20
400 g basis weight with low-density polyethylene resin layer of μm
/ M ² paper base material facing each other, and between the layers,
Using low-density polyethylene, a biaxially stretched polyethylene terephthalate film having a vapor-deposited aluminum film and a paper substrate were melt-extruded and laminated through a low-density polyethylene resin layer having a thickness of 20 μm while being melt-extruded. . (2). Next, the surface of the biaxially stretched polyethylene terephthalate film melt-extruded and laminated in (1) above is
A liquid-curable urethane-based anchor coating agent was used, and this was coated with a gravure roll coating method to a film thickness of 0.1 g / m 2.
² Anchor by coating so that it is (dry)
A coating agent layer is formed, and then low-density polyethylene is used on the surface of the anchor-coating agent layer, and is melt-extruded through a low-density polyethylene resin layer having a thickness of 20 μm. A low-density polyethylene and an ethylene-α-olefin copolymer are melt-coextruded to form a low-density polyethylene film layer having a thickness of 20 μm and a thickness of 2 μm.
A multilayer coextruded laminated film having a thickness of 40 μm comprising an ethylene-α-olefin copolymer film layer of 0 μm was melt-extruded and laminated by lamination to produce a laminated material having the following layer constitution. Low-density polyethylene resin layer / paper base material / low-density polyethylene resin layer / aluminum vapor-deposited film / biaxially-stretched polyethylene terephthalate film / anchor coating agent layer / low-density polyethylene resin layer / multilayer co-extruded laminated film ( 3). Then, using the laminated material produced above, a blank plate was formed, a tubular sleeve was formed, a bottom seal portion was formed, and the content was changed in the same manner as in Example 1 above. A sealed liquid paper container was manufactured through filling, formation of a gabelle top seal part, and the like.

Experimental Examples The liquid paper containers manufactured in Examples 1 to 6 and Comparative Examples 1 to 3 were tested for sealability and roasted pinhole. (1). Test for seal suitability In this test, a top seal and a bottom seal were performed with a liquid paper container filling machine, and the sealability was checked with a seal check solution. (2). Test of broiled pinhole This is a liquid paper container molded by a liquid paper container filling machine,
A seal check solution was added, and a test was conducted by checking the presence or absence of a blown pinhole at the top seal portion and the bottom seal portion. The test results are shown in Table 1 below.

[0037] In Table 1 above, broiling means a roasted pinhole, ○ indicates a seal, a good area of the roasted pinhole,
△ represents a possible area of the seal and the roasted pinhole, and ×
Indicates a defective area of the seal or the roasted pinhole.

As is clear from the test results shown in Table 1 above, those according to Examples 1 to 6 had a seal temperature of 31.
It had a wide seal temperature range of 0 ° C to 410 ° C, was easy to control, and did not show any occurrence of roasting pinholes. On the other hand, those of Comparative Examples 1 to 3 were unfavorable because the seal temperature range was narrow and the control thereof was difficult, and the occurrence of roasting pinholes was often observed.

[0039]

As apparent from the above description, the present invention relates to a laminated material comprising at least a paper base material, a barrier layer and a heat-sealing resin layer. The layer is composed of a base film having a metal compound vapor-deposited film on one surface thereof, and has a barrier property comprising the above-described paper substrate and a substrate film having a metal compound vapor-deposited film provided on one surface thereof. A laminated material having a configuration in which an adhesive resin layer having a thickness of 30 to 100 μm is provided between layers, and using this, first, the laminated material is subjected to creases and the like, and a blank plate is formed into a desired shape. , Then penetrate the contents,
In order to prevent liquid leakage or the like, the end face is subjected to, for example, skive hemming treatment or the like, and then the seal face is subjected to framing treatment or hot air.
After processing, etc., frame seal or hot air
A cylindrical sleeve is manufactured by sticking the body with a seal or the like, and then the cylindrical sleeve manufactured as described above is supplied to a content filling machine, and then used for filling the content. First, first, the inner surface of the bottom of the tubular sleeve is roasted with hot air, and the bottom is manufactured by performing a press seal.
After filling the contents, the inner surface of the top is burned with hot air, press-sealed to form a top portion, and the sealed liquid paper container filled with the contents is manufactured to transmit oxygen gas, water vapor, etc. Excellent barrier properties to prevent the occurrence of roasting pinholes, avoiding seal failure, liquid leakage, etc., preventing deterioration of the contents, etc., as well as excellent preservability and storage properties. Liquid paper containers can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a layer configuration of an example of a laminate constituting a liquid paper container according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a layer configuration of an example of a laminate constituting the liquid paper container according to the present invention.

FIG. 3 is a schematic perspective view showing a configuration of a liquid paper container in each box-making process using the laminated material shown in FIG. FIG.

FIG. 4 is a schematic perspective view showing the structure of the liquid paper container in each box making process using the laminated material shown in FIG. FIG.

FIG. 5 is a schematic perspective view showing the configuration of the liquid paper container in each box-making process, showing the configuration of the box-making process for the container of the liquid paper container according to the present invention using the laminated material shown in FIG. FIG.

FIG. 6 is a schematic perspective view showing the structure of the liquid paper container in each box making process using the laminated material shown in FIG. FIG.

FIG. 7 is a schematic configuration diagram showing an outline of a take-up type vacuum evaporation apparatus.

[Explanation of symbols]

A Laminated material A ₁ Laminated material B Blank board C Tubular sleeve D Packaging container E Sealed liquid paper container 1 Paper substrate 2 Barrier layer 3 Heat-sealing resin layer 3a Heat-sealing property Resin layer 4 Deposited film of metal compound 5 Base film 6 Adhesive resin layer 11 Folding rule 12 Glue margin 13 End 14 Body seal 15 Bottom seal 16 Opening upward 17 Contents 18 Roof Mold top seal part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yukinobu Yamaguchi 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 3E060 AA04 AB04 BC01 BC04 DA18 DA20 DA21 DA30 EA03 EA06 EA13 EA14 3E086 AD02 BA04 BA13 BA14 BA15 BA33 BB01 BB51 BB71 CA11 CA12 CA13 4F100 AB01D AB10D AK01C AK01E AK03E AK03G AK05G AK06E AK06G AK41E AK42 AK51 AK68G AK70G AL01G AT00B BA05 BA07 BA10C BA10E DA01 DG10A EH20E EH202 EH66D EH662 EJ38B GB16 JD01B JD02 JD05 JL12C JL12E 4K029 AA11 AA26 BA03 BC00 EA01 FA07

Claims (7)

[Claims] At least a paper substrate, a barrier layer and a heat sink
A liquid paper container produced by laminating a laminated material comprising a sealable resin layer, and the barrier layer comprises a base film having a metal compound vapor-deposited film on one surface. Further, an adhesive resin layer having a thickness of 30 to 100 μm is provided between the paper base and a barrier layer formed of a base film provided with a metal compound vapor-deposited film on one surface thereof. Liquid paper container. 2. The liquid paper container according to claim 1, wherein the paper base has a heat-sealing resin layer on the other surface. 3. The liquid paper container according to claim 1, wherein the metal compound vapor-deposited film comprises an aluminum vapor-deposited film. 4. The liquid paper container according to claim 1, wherein the base film comprises a biaxially stretched resin film or sheet. 5. The liquid paper container according to claim 1, wherein the heat-adhesive resin layer comprises a single layer resin layer extruded by melt extrusion or a multilayer resin layer extruded by co-extrusion. 6. The ethylene-α ······················································································· 低 ·
Olefin copolymer, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-
Acrylic acid copolymer, ethylene-methacrylic acid copolymer, or an ionomer resin, characterized in that it comprises a single layer resin layer or a multi-layer resin layer extruded by melt extrusion comprising one or more resins. The liquid paper container according to claim 1. 7. An ethylene-α-olefin copolymer, a low-density polyethylene, wherein the heat-sealing resin layer is polymerized using a metallocene catalyst (single-site catalyst).
The liquid paper container according to any one of claims 1 to 6, comprising a linear (linear) low-density polyethylene, a medium-density polyethylene, or a heat-sealing polyester resin.