JP2005263274A - Cylindrical paper container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rectangular column shaped paper container which has such a high degree of a barrier property that the barrier property can be retained even if contents are preserved therein for a long period of time, which is excellent in rigidity and in shatter strength for a container, and easy to carry out disposal after use, having a high degree of practicability as a high-functionality paper container for liquid. <P>SOLUTION: The cylindrical paper container is characterized in that, it is constituted of: a barrel made by molding a laminated layer material into a cylindrical form with edge-protect applied thereon, the laminated layer material is formed such that a paper layer having a heat-sealable resin layer on its surface is used as a base material, in which at least an inorganic-compound-deposited film is disposed as a barrier material with a heat-sealable resin layer formed in the barrier material; a lid body made of a laminated layer material so made that a paper layer having a heat-sealable resin layer on its surface is used as a base material, in which at least a high-polymer film with a barrier property and an inorganic compound deposited film are disposed as barrier materials with a heat-sealable resin layer formed in the barrier material, and of a bottom body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a cylindrical paper container mainly composed of a paper layer, and more specifically, it comprises a trunk portion including a barrier material, a lid body and a bottom body. In particular, the barrier property is maintained even when the contents are stored for a long period of time. The present invention relates to a cylindrical paper container having a high barrier property.

  A paper container using a paper laminate material mainly composed of a paper layer and provided with a heat-sealable resin layer as an innermost layer and an outermost layer is used as a container replacing a can or a bottle. In order to improve the storage stability of the contents of these paper containers, a configuration in which a barrier material is arranged in the laminated configuration is adopted. A typical material for this barrier material is aluminum foil. However, when an aluminum foil is included in the laminated structure, there is a problem that separation processing after use becomes difficult and incineration processing cannot be performed as it is. Instead of this aluminum foil, a vapor deposition film provided with an inorganic compound vapor deposition layer such as silicon oxide or aluminum oxide is used as a barrier material.

  However, a paper container having a configuration in which a barrier material made of a vapor deposition film provided with an inorganic compound vapor deposition layer such as silicon oxide or aluminum oxide as described above has a certain barrier property for storing contents. However, the barrier property was insufficient as a paper container for storing the contents for a long period of time. It has been desired to develop a highly functional highly functional liquid paper container that has a high barrier property capable of maintaining the barrier property even when the contents are stored for a long period of time and is excellent in strength.

  Since the present invention is made in consideration of the above technical background, it has a high barrier property that can maintain the barrier property even if the contents are stored for a long period of time, and has excellent rigidity and drop strength as a container. An object is to provide a highly practical cylindrical paper container as a highly functional liquid paper container that can be easily disposed of later.

To achieve the above objectives, ie
The invention according to claim 1
A paper layer provided with a heat-sealable resin layer on the surface is used as a base material, and an inorganic compound vapor-deposited film is disposed at least as a barrier material inside the base material, and a heat-sealable resin layer is provided inside the barrier material. The body of the laminated material is formed into a cylindrical shape with edge protection and a paper layer with a heat-sealable resin layer on the surface. A cylindrical paper container comprising a lid and a bottom made of a laminated material in which a molecular film and an inorganic compound vapor-deposited film are arranged, and a heat-sealable resin layer is provided inside the barrier material. is there.

The invention according to claim 2
2. The cylindrical paper container according to claim 1, wherein the barrier polymer film of the barrier material is an ethylene-vinyl alcohol copolymer (EVOH) film.

The invention according to claim 3
The cylindrical paper container according to claim 1 or 2, wherein the inorganic compound is aluminum oxide, silicon oxide, tin oxide, magnesium oxide, or a mixture thereof.

The invention according to claim 4
The tubular paper container according to any one of claims 1 to 3, wherein an aqueous coating layer is formed on a vapor deposition surface of the inorganic compound vapor deposition film of the barrier material.

The invention according to claim 5
5. The cylindrical paper container according to claim 4, wherein the aqueous coating layer comprises a coating layer containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof.

The invention according to claim 6
The cylindrical paper container according to claim 4, wherein the aqueous coating layer is made of a coating agent containing a water-soluble polymer and tin chloride.

The invention according to claim 7 provides:
When the barrier material formed by arranging the barrier polymer film and the inorganic compound vapor-deposited film is arranged so that the vapor deposition surface of the inorganic compound vapor-deposited film and the barrier polymer film face each other, and the container is used as a container, the inorganic compound vapor-deposited The cylindrical paper container according to any one of claims 1 to 6, wherein the film side is disposed inside the container and the barrier polymer film side is disposed outside the container.

The invention according to claim 8 provides:
The edge protection tape used for the edge protection processing has at least a barrier polymer film and an inorganic compound vapor-deposited film as the barrier material, and a heat-sealable resin layer is provided on the front and back of the substrate, and the inorganic compound vapor-deposited film It arrange | positions so that the vapor deposition surface of this and the said barrier polymer film may face, and this inorganic compound vapor deposition film side is arrange | positioned at the side which touches the content, The any one of Claims 1-7 characterized by the above-mentioned. This is a cylindrical paper container.

<Action>
A barrier material composed of a vapor deposition film provided with an inorganic compound vapor deposition layer on the inner side of a base material used in the body part constituting the cylindrical paper container of the present invention, and an inorganic compound vapor deposition layer used for a lid and a bottom body A barrier material comprising a vapor-deposited film and a barrier polymer film, or an aqueous coating layer of a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof, or a water-soluble polymer and an oxidation layer on the vapor deposition layer High barrier property against oxygen gas, etc. even when the contents are stored for a long time by using a barrier material with a water-based coating layer made of tin and a barrier polymer film disposed on the coating layer Can be maintained. The drop strength is improved along with the rigidity of the cylindrical container.

  Furthermore, as an inorganic compound vapor deposition film barrier material, the vapor deposition surface of the inorganic compound vapor deposition film (aqueous coating layer) and the barrier polymer film are arranged so as to face each other, and when the container is used, the inorganic compound vapor deposition film side is inside the container, By adopting a constitution in which the barrier polymer film side is disposed outside the container, moisture is blocked by the inorganic compound vapor-deposited film, and a hydrophilic barrier polymer such as an ethylene-vinyl alcohol copolymer (EVOH) film is provided. Since deterioration of the film due to moisture can be prevented, high barrier properties against oxygen gas and the like can be maintained even when the contents are stored for a long period of time.

  Since the cylindrical paper container of the present invention is configured as described above, it has a high barrier property that can maintain the barrier property even when the contents are stored for a long period of time, and is highly practical as a highly functional liquid paper container. A cylindrical paper container can be provided. Further, the container has excellent rigidity and drop strength, and can be used as a container having a certain rigidity and drop strength, such as a vending machine.

  Furthermore, in order to improve the storage stability of the contents of the conventional paper container, problems such as separation processing and incineration processing after use of the conventional paper container having a configuration in which a barrier material made of aluminum foil is arranged in the laminated structure are solved. The

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view illustrating an example of a cylindrical paper container of the present invention. FIG. 2 is a cross-sectional view showing an example of the configuration of the laminated material used for the body portion of the cylindrical paper container of the present invention. FIG. 3 is a cross-sectional view showing another example of the configuration of the laminated material used for the body portion of the cylindrical paper container of the present invention. FIG. 4 is a cross-sectional view showing an example of the configuration of the laminated material used for the lid and bottom of the cylindrical paper container of the present invention. FIG. 5 is a cross-sectional view showing another example of the configuration of the laminated material used for the lid and bottom of the cylindrical paper container of the present invention. FIG. 6 is a cross-sectional view showing an example of a configuration of an edge protection tape used in edge protection processing in the body portion of the cylindrical paper container of the present invention. FIG. 7 is an explanatory view for explaining edge protection processing in the body portion of the cylindrical paper container of the present invention.

  In FIG. 1, a cylindrical paper container of the present invention has a barrel portion 1 formed into a cylindrical shape by performing edge protection processing, a lid body 2 and a bottom body 3 disposed above and below the barrel portion, In addition, the folded portion obtained by folding the end edge of the bottom body 3 is a container in which both ends of the body portion 1 are folded and overlapped and integrated by heat sealing. Here, the lid 2 is provided with a drinking mouth 4 at a portion, and the drinking mouth 4 is covered and sealed with a sealing material 5.

  The cylindrical paper container of the present invention refers to a rectangular column having four rounded corners or a cylindrical shape.

  In FIG. 2, the laminated materials used for the body of the cylindrical paper container in the present invention are 10 and 15 are heat-sealable resin layers, 11 is a paper layer, and 12 is a first film such as polyethylene terephthalate (PET). A base material, 13 is a vapor deposition film base material, and 16 is a barrier material made of a vapor deposition film formed by forming an inorganic compound vapor deposition layer 14 on the vapor deposition film base material 13. And it arrange | positions so that it may become the container outer side when the upper side of a figure makes a container and the lower side of a figure makes a container.

  FIG. 3 shows an aqueous coating layer 17 made of a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof, or an aqueous coating layer 17 made of a water-soluble polymer and tin oxide. The example of the laminated material which comprises the cylindrical paper container of this invention of the provided structure is shown.

  Furthermore, in FIG. 4, the laminated materials used for the lid and bottom of the cylindrical paper container of the present invention are 10 and 15 are heat-sealable resin layers, 11 is a paper layer, 12 is polyethylene terephthalate (PET), and the like. 1 is a second film substrate such as polyethylene (PE), 18 is a barrier polymer film such as an ethylene-vinyl alcohol copolymer (EVOH) film, and 13 is a vapor deposition film substrate. , 16 is a barrier material made of a vapor deposition film formed by forming an inorganic compound vapor deposition layer 14 on the vapor deposition film substrate 13. 20 is a barrier material in which a barrier polymer film 18 such as an ethylene-vinyl alcohol copolymer (EVOH) film and a vapor deposition film 16 formed by forming an inorganic compound vapor deposition layer 14 on a vapor deposition film substrate 13 are disposed. 20. And when it arrange | positions so that the vapor deposition surface 14 of the inorganic compound vapor deposition film 16 and the barrier polymer film 18 may face each other, and it is set as a container, the said inorganic compound vapor deposition film 16 side is a container inner side, and the said barrier polymer film 18 side is Arranged outside the container. That is, they are arranged so that the upper side of the figure is the container outer side when the container is used, and the lower side of the figure is the inner side of the container when the container is used.

  Further, in FIG. 5, the laminated material used for the lid and bottom of the cylindrical paper container of the present invention forms an inorganic compound vapor deposited layer 14 on the vapor deposited film substrate 13 constituting the laminated material shown in FIG. An example of a configuration in which an aqueous coating layer of a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof, or an aqueous coating layer 17 made of a water-soluble polymer and tin oxide is provided on the inorganic compound vapor deposition layer 14 of the vapor deposition film 16 formed as above. Is shown. 21 is a vapor-deposited film 16 provided with a water-soluble polymer and an aqueous coating layer of a metal alkoxide or a hydrolyzate thereof or a water-soluble polymer and tin oxide on the barrier polymer film 18 and the inorganic compound vapor-deposited layer 14; Is a barrier material 20 formed by arranging And when it arrange | positions so that the water-based coating layer 17 and the barrier polymer film 18 may face each other, and it is set as a container, the said inorganic compound vapor deposition film 16 side is arrange | positioned inside a container, and the said barrier polymer film 18 side is arrange | positioned on the container outer side. The That is, they are arranged so that the upper side of the figure is the container outer side when the container is used, and the lower side of the figure is the inner side of the container when the container is used.

  As shown in FIG. 7 (a), the barrel 1 of the cylindrical paper container of the present invention is formed into a cylindrical shape by applying edge protection to the end surface portion 6 of the barrel laminate material that becomes the inner surface of the vessel. As an example of the edge protection tape used for this edge protection processing, in FIG. 6, 10 and 15 are heat-sealable resin layers, 12 is a first film substrate such as polyethylene terephthalate (PET), and 18 is ethylene- A barrier polymer film such as a vinyl alcohol copolymer (EVOH) film, 13 is a vapor deposition film substrate, and 16 is a vapor deposition film formed by forming an inorganic compound vapor deposition layer 14 on the vapor deposition film substrate 13. The barrier material 20 is composed of a barrier polymer film 18 such as an ethylene-vinyl alcohol copolymer (EVOH) film and a vapor deposition film 16. And it arrange | positions so that the vapor deposition surface 14 of the inorganic compound vapor deposition film 16 and the barrier polymer film 18 may face each other, and the inorganic compound vapor deposition film 16 side is arrange | positioned at the side which touches the contents. That is, the lower side of the figure is arranged on the side in contact with the contents of the container.

  In addition, polyethylene terephthalate (PET) 12, which is the first film substrate, is laminated as necessary, and can be removed.

  Using the edge protection tape having the above structure, as shown in FIG. 7B, the edge protection tape 7 is laminated so as to cover the end surface 1b in contact with the contents of the laminated material 1a used for the container body 1. Provide.

  The first and second film base materials 12 and 19 and the vapor deposition film base material 13 used in the present invention are film-like, and plastic films that are usually used as packaging materials can be used. Although not particularly limited, a polyester film such as a polyethylene terephthalate film, a polyethylene terephthalate copolymer polyester film, a polyethylene naphthalate film, a nylon 66 film, a nylon 6 film, a polyamide film such as a metaxylidenediamine copolymer polyamide film, etc. Polyolefin film such as polycarbonate film, polypropylene film, polyethylene film, ethylene-propylene copolymer film, polyimide film, polyamideimide film, polyvinyl alcohol film, ethylene-vinyl alcohol copolymer film, polyphenylene film, polysulfone film, polyphenylene Sulfide film and the like. Of these, polyester films and polyamide films can be more preferably used from the viewpoints of heat resistance, strength, suitability for vapor deposition, and the like. The thickness of these films is not particularly limited, but is preferably about 6 μm to 300 μm, and more preferably 6 to 25 μm from the viewpoint of flexibility. These plastic films may be used alone or in layers. In the present invention, when silicon oxide, aluminum oxide or the like is formed by vapor deposition, the light transmittance is preferably 50% or more, more preferably 80% or more in terms of total light transmittance. In addition to plastic, it is also possible to use paper or a laminated material containing paper as the film.

  For example, known additives such as an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a colorant are appropriately added to the first and second film substrates and the deposited film substrate as necessary. .

  Furthermore, the surface on which the vapor deposition film base material 13 is vapor-deposited is used as necessary, for example, using corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, chemicals, etc. Pretreatment such as oxidation treatment or other treatment can be optionally performed. The surface pretreatment may be performed in a separate process before forming the vapor deposition layer. For example, in the case of surface treatment by low-temperature plasma treatment, glow discharge treatment, etc., as the pretreatment for forming the vapor deposition layer Preprocessing can be performed by inline processing. In such a case, there is an advantage that the manufacturing cost can be reduced. As other methods for improving the above-mentioned adhesion, for example, a primer coat agent layer, an undercoat agent layer, or a deposition anchor coat agent layer is previously formed on the surface of the film substrate. It can also be arbitrarily formed. As the pre-treatment coating agent layer, for example, a resin composition containing a polyester resin, a polyurethane resin, or the like as a main component of the vehicle can be used. In the above, the coating agent layer can be formed by using, for example, a solvent type, aqueous type, or emulsion type coating agent, a roll coating method, a gravure roll coating, etc. The coating can be performed using a coating method such as a method, a kiss coating method, or the like. Surface adhesion such as corona treatment and anchor coating treatment can be performed to improve the adhesion of the deposited layer.

  The inorganic compound vapor deposition layer 14 in the present invention is made of oxide, nitride, fluoride alone, or a composite thereof such as silicon, aluminum, titanium, zirconium, tin, magnesium, etc. Among them, in particular, aluminum oxide and Silicon oxide is preferred.

  Moreover, the thickness of the inorganic compound vapor deposition layer 14 has the preferable range of 5-300 nm. The optimum thickness of the thin film layer varies depending on the type and configuration of the inorganic compound used, but the value is appropriately selected. If the film thickness is less than 5 nm, a uniform film may not be obtained or the film thickness may not be sufficient, and the function as a gas barrier material may not be sufficiently achieved. On the other hand, when the film thickness exceeds 300 nm, flexibility cannot be maintained in the thin film, and the thin film may be cracked due to external factors such as bending and pulling after the film formation. A range of 10 to 150 nm is particularly preferable.

  There are various methods for forming the above-mentioned inorganic compound vapor deposition layer 14, and it can be formed by a normal vacuum vapor deposition method, but other thin film formation methods such as sputtering, ion plating, and plasma vapor phase growth. (CVD) or the like can also be used. However, considering productivity, the vacuum deposition method is the best at present. As the heating means of the vacuum deposition apparatus by the vacuum deposition method, an electron beam heating method, a resistance heating method, or an induction heating method is preferable. In order to improve the adhesion between the thin film and the base material and the denseness of the thin film, a plasma assist method or an ion It is also possible to use a beam assist method. In addition, in order to increase the transparency of the deposited film, reactive deposition such as blowing oxygen gas may be performed during the deposition.

Moreover, as a laminated material used for the trunk | drum of the cylindrical paper container of this invention, the structure which provided the aqueous coating layer 17 on the vapor deposition layer 14 of the vapor deposition film 16 shown in FIG. 3, and the lid | cover of the cylindrical paper container of this invention As a laminated material used for the body and the bottom body, as shown in FIG. 5, the barrier property can be further improved by providing an aqueous coating layer 17 on the vapor deposition layer 14 of the vapor deposition film 16. The aqueous coating layer 17 is mainly composed of a water-soluble polymer, (a) one or more metal alkoxides and hydrolysates thereof, or (b) an aqueous solution containing at least one of tin chloride, or a water / alcohol mixed solution. It consists of a coating agent. A solution in which a water-soluble polymer and tin chloride are dissolved in an aqueous (water or water / alcohol mixed) solvent, or a solution in which a metal alkoxide is directly or previously hydrolyzed is mixed. The inorganic compound vapor deposition layer 14 of the vapor deposition film 16 is formed by coating, heating and drying.

  Examples of the coating agent for the aqueous coating layer 17 in the present invention include water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, starch, methyl cellulose, carboxymethyl cellulose, and sodium alginate. In particular, when polyvinyl alcohol (PVA) is used for the coating agent of the gas barrier laminate of the present invention, the gas barrier property is most excellent. PVA here is generally obtained by saponifying polyvinyl acetate, from so-called partially saponified PVA in which several tens of percent of acetate groups remain to completely saponified PVA in which only several percent of acetate groups remain. There is no particular limitation.

The tin chloride may be stannous chloride (SnCl ₂ ), stannic chloride (SnCl ₄ ), or a mixture thereof, and may be used as an anhydride or a hydrate.

Furthermore, the metal alkoxide has a general formula such as tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ], triisopropoxy aluminum [Al (O-2′-C ₃ H ₇ ) ₃ ],
M (OR) n
(M: metal such as Si, Ti, Ai and Zr, R: alkyl group such as CH ₃ and C ₂ H ₅ ). Among these, tetraethoxysilane and triisopropoxyaluminum are preferable because they are relatively stable in an aqueous solvent after hydrolysis.

  Each of the above components can be added to the coating agent alone or in combination, and further within the range that does not impair the barrier properties of the coating agent, isocyanate compound, silane coupling agent, dispersant, stabilizer, viscosity adjustment Known additives such as coloring agents and coloring agents can be added.

  For example, the isocyanate compound added to the coating agent has two or more isocyanate groups (NCO groups) in the molecule, such as tolylene diisocyanate (TDI), triphenylmethane triisocyanate (TTI), tetramethyl. There are monomers such as xylene diisocyanate (TMXDI), and polymers and derivatives thereof.

  Conventionally known means such as a dipping method, a roll coating method, a screen printing method, and a spray method are used for the coating method of the coating agent. Although the thickness of the film varies depending on the type of coating agent, the thickness after drying may be in the range of about 0.01 to 100 μm. However, if the thickness is 50 μm or more, cracks are likely to occur in the film. 50 μm is desirable.

Examples of the barrier polymer film 18 used in the present invention include a polyacrylic resin, a polymethacrylic resin, a polyacrylonitrile resin, a polymethacrylonitrile resin, a polystyrene resin, a polycarbonate resin, Polyethylene terephthalate resin or a resin obtained by copolymerizing or modifying a part of its ethylene component and / or terephthalate component with another di- or higher polyhydric alcohol component or dicarboxylic acid component, or polyethylene naphtha Polyester resins such as rate resins, polyamide resins such as MXD nylon (trade name, manufactured by Mitsubishi Gas Chemical Industries, Ltd.), ethylene-vinyl alcohol copolymers, polyvinyl alcohol resins, etc. Resin can be used. In the present invention, among the above-mentioned resins, it is desirable to use a resin having a fragrance retention property and a barrier property against oxygen gas or water vapor. Specifically, for example, an ethylene-vinyl alcohol copolymer is used. It is desirable to use a resin rich in aroma retaining property, barrier property, etc. made of polyamide resin, polyacrylonitrile resin, polyester resin or the like. In the above, in particular, as the ethylene-vinyl alcohol copolymer,
The ethylene content is preferably about 20 to 65 mol%, and the saponification degree is preferably 90% or more. In the present invention, the above ethylene-vinyl alcohol copolymer may be added to other resins such as α-olefins such as propylene, isobutene, 4-methyl-pentene and hexene, carboxylic acids such as itaconic acid and methacrylic acid. Alternatively, a salt, ester, anhydride, or a polymer such as a silane compound such as vinyltrimethoxysilane may be included. In this case, the gas barrier properties of the ethylene-vinyl alcohol copolymer are not affected. It is desirable that the added amount of.

  Among the barrier polymer films listed above, ethylene-vinyl alcohol copolymer (EVOH) is particularly preferably used.

  Next, the heat seal resin constituting the heat seal resin layers 10 and 15 used in the present invention is a thermoplastic resin that can be extruded and can be melted by heat and fused to each other. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer Polyolefin resins such as ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene or polypropylene, acrylic acid, methacrylic acid, maleic acid, maleic anhydride , Unsaturated carboxylic acids such as fumaric acid, itaconic acid, etc. Sex was acid-modified polyolefin resins, polyvinyl acetate resins, polyester resins, polystyrene resins, one or resin comprising more resins other like can be used. In the present invention, when two layers of the thermoplastic resin layer are formed using the resin as described above, it can be formed by combining the same kind of resins or different kinds of resins. For example, it may be formed using the same kind of polyethylene resin, or different kinds of polyethylene resin and ethylene-vinyl acetate copolymer or polyethylene resin and ethylene-methacrylic acid copolymer are used. It can also be formed.

Among the above resins, it is particularly preferable to use linear (linear) low density polyethylene. The above-mentioned linear low density polyethylene has the advantage of improving impact resistance with less propagation of breakage because it has adhesiveness, and since the inner layer is always in contact with the contents, It is also effective for preventing degradation of environmental stress cracking properties. The barrier material having the above configuration is such that the vapor deposition surface 14 of the inorganic compound vapor deposition film 16 or the aqueous coating layer 17 and the barrier polymer film 18 face each other. If it arrange | positions and laminates | stacks, since a barrier property will become still higher, it is preferable.

As a lamination method of the laminated material used for the trunk | drum 1, the cover body 2, and the bottom body 3 of the cylindrical paper container of this invention, it laminates | stacks through the adhesive layer for laminating by the adhesive for laminating, for example. It can be carried out by a dry lamination method or an extrusion lamination method in which layers are laminated via a melt extrusion resin layer made of a melt extrusion adhesive resin. In the above, as the laminating adhesive, for example, one-pack or two-pack curable or non-cured vinyl, (meth) acrylic, polyamide, polyester, polyether, polyurethane, etc. Laminate adhesives such as solvent-type, epoxy-type, rubber-type, and other solvent-type, aqueous-type, and emulsion-type can be used. Examples of the coating method for the above laminating adhesive include direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, and Fonten method. , Transfer roll coating method, and the like, and the coating amount is 0.1 to 10 g / m <2> (dry state), more preferably 1 to 5 g / The m ² (dry state) position is desirable. In the present invention, for example, an adhesion promoter such as a silane coupling agent can be arbitrarily added to the laminating adhesive. Next, in the above, as the melt-extrusion adhesive resin, the above-described thermoplastic resin forming the thermoplastic resin layer can be similarly used. In the present invention, as the melt-extrusion adhesive resin, it is particularly preferable to use low-density polyethylene, particularly linear low-density polyethylene or acid-modified polyethylene. The film thickness of the melt-extruded resin layer made of the above-described melt-extruded adhesive resin is preferably about 5 to 100 μm, more preferably about 10 to 50 μm. In the present invention, when the above-mentioned lamination is performed, if it is necessary to obtain stronger adhesive strength, if necessary, for example, an anchor coating agent or the like on the first barrier thin film surface. It is also possible to coat an adhesion improver or the like. Specific examples of the anchor coat agent include organic titanium anchor coat agents such as alkyl titanate, isocyanate anchor coat agents, and polyethyleneimine anchor coats. -Various anchor coating agents such as water-based or oil-based coating agents such as a coating agent, a polybutadiene anchor coating agent, and the like can be used. In the present invention, the above-mentioned anchor coating agent is coated by, for example, a roll coat, a gravure coat, a knife coat, a dip coat, a spray coat, or other coating methods. Then, the solvent, diluent, etc. can be dried to form the anchor coating layer. In the above, the coating amount of the anchor coating agent is preferably about 0.1 to 5 g / m ² (dry state).

  In addition, a printing layer is usually provided on the surface of the paper layer that forms the outer side of the cylindrical paper container of the present invention. This printed layer is formed for practical use as a package or the like. For example, various pigments, extender pigments and additives such as plasticizers, desiccants and stabilizers are added to conventionally used ink binder resins such as urethane, acrylic, nitrocellulose, and rubber. It is a layer composed of ink. Characters, pictures, and the like are formed by this printing. As a forming method, for example, a known printing method such as an offset printing method, a gravure printing method, a silk screen printing method, or a known coating method such as a roll coating, a knife edge coating, or a gravure coating can be used. The dry film thickness (solid content) of the printing layer may be 0.1 to 2.0 μm.

  Among the above, it is preferable to employ a gravure printing method using an ink that complies with the self-regulatory standards for food packaging material inks.

  Examples of the present invention will be specifically described below.

  Each laminated material was created about the trunk | drum which comprises the cylindrical paper container of this invention, a cover body, a bottom body, and the edge protection tape used for edge protection processing.

<Body laminate material>
Heat seal resin layer (PE ₂₀ ) / paper layer (320 g / m ² ) / first substrate layer (PET ₁₂ ) / (aluminum oxide / PET ₁₂ ) vapor deposition film layer / heat seal resin layer (PE ₆₀ ) A torso laminate material of construction was created.

In addition, the subscript value of each layer shows the thickness (micrometer) of a base material. (The same applies hereinafter)
<Cover Laminate Material>
Heat seal resin layer (PE ₄₀ ) / paper layer (250 g / m ² ) / second substrate layer (PE ₅₅ ) / first substrate layer (PET ₁₂ ) / barrier polymer film layer (EVOH ₁₅ ) A lid laminate material composed of / (aluminum oxide / PET ₁₂ ) vapor deposition film layer / heat seal resin layer (PE ₆₀ ) was prepared. When the barrier material formed by arranging the barrier polymer film and the inorganic compound vapor-deposited film is arranged so that the vapor deposition surface of the inorganic compound vapor-deposited film faces the barrier polymer film and is used as a container, the inorganic compound vapor-deposited film The side is disposed inside the container, and the barrier polymer film side is disposed outside the container.

<Bottom laminate material>
Heat seal resin layer (PE ₂₀ ) / paper layer (200 g / m ² ) / second substrate layer (PE ₃₅ ) / first substrate layer (PET ₁₂ ) / barrier polymer film layer (EVOH ₁₅ ) A bottom laminate material having a structure of / (aluminum oxide / PET ₁₂ ) vapor deposition film layer / heat seal resin layer (PE ₆₀ ) was prepared. When the barrier material formed by arranging the barrier polymer film and the inorganic compound vapor-deposited film is arranged so that the vapor deposition surface of the inorganic compound vapor-deposited film faces the barrier polymer film and is used as a container, the inorganic compound vapor-deposited film The side is disposed inside the container, and the barrier polymer film side is disposed outside the container.

<Edge protection tape laminate material>
Heat seal resin layer (PE ₄₀ ) / first substrate layer (PET ₁₂ ) / (aluminum oxide / PET ₁₂ ) vapor deposition film layer / heat seal resin layer (PE ₄₀ )
Folding the above laminated material into a cylindrical body with edge protection, a rectangular lid and bottom body above and below the trunk, and folding the lid and bottom edge A cylindrical paper container having a capacity of 250 cc was prepared by bending the body part at both ends of the body part and superimposing them and integrating them by heat sealing.

The laminated material constituting the lid, bottom and edge protection tape of Example 1 is the same as Example 1 except that the laminated material having a configuration excluding the barrier polymer film layer (EVOH) provided thereon is used. Thus, a cylindrical paper container having a capacity of 250 cc was prepared.

The oxygen barrier property of the cylindrical paper container obtained above was evaluated based on the following measurement method. The results are shown in Table 1.

<Oxygen permeability measurement method>
Using an oxygen permeability measuring device (Modern Control, OXTRAN-2 / 20), the measurement was performed in an atmosphere at 30 ° C.-70% RH.

表１には、各々の実施例で得られた筒状紙容器の酸素透過度を記した。

Table 1 shows the oxygen permeability of the cylindrical paper container obtained in each example.

  From Table 1, the oxygen permeability of the cylindrical paper container of the present invention of Example 1 is compared with the oxygen permeability of the conventional cylindrical paper container obtained in Example 2 as a comparative example of the present invention. The oxygen permeability of the cylindrical paper container of the present invention is 0.001 to 0.004 cc / pack · day · 0.02 MPa, whereas the oxygen permeability of the conventional cylindrical paper container is 0.006. ~ 0.010cc / pack · day · 0.02MPa, and the cylindrical paper container of the present invention is excellent in oxygen barrier properties. For example, a container such as a 100% concentration juice or the like is long as the contents. It has a high barrier property that can maintain the barrier property even if it is stored for a long period of time, has excellent rigidity and drop strength as a container, and is easy to dispose after use. A paper container can be provided.

It is explanatory drawing which shows the cylindrical paper container of this invention. It is sectional drawing which shows an example of a structure of the laminated material used for the trunk | drum of the cylindrical paper container of this invention. It is sectional drawing which shows the other example of a structure of the laminated material used for the trunk | drum of the cylindrical paper container of this invention. It is sectional drawing which shows an example of a structure of the laminated material used for the cover body and bottom body of the cylindrical paper container of this invention. It is sectional drawing which shows the other example of a structure of the laminated material used for the cover body and bottom body of the cylindrical paper container of this invention. It is sectional drawing which shows an example of a structure of the edge protection tape used for the edge protection process in the cylindrical paper container of this invention. It is explanatory drawing explaining the edge protection process in the cylindrical paper container of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Body part 1a ... Body part laminated material 1b ... Body part laminated material end surface 2 ... Cover body 3 ... Bottom body 4 ... Drinking mouth vapor deposition layer 5 ... Sealing material 6 ... edge protection processing part 7 ... edge protection tape 10, 15 ... heat seal resin layer 11 ... paper layer 12 ... first film base layer 13 ... vapor deposition film base Layer 14 ... inorganic compound vapor deposition layer 16 ... vapor deposition film 17 ... aqueous coating layer 18 ... barrier polymer film layer 19 ... second film substrate layers 20 and 21 ... barrier Material

Claims (8)

  A paper layer provided with a heat-sealable resin layer on the surface is used as a base material, and an inorganic compound vapor-deposited film is disposed at least as a barrier material inside the base material, and a heat-sealable resin layer is provided inside the barrier material. The body of the laminated material is formed into a cylindrical shape with edge protection and a paper layer with a heat-sealable resin layer on the surface. A cylindrical paper container comprising a lid and a bottom made of a laminated material in which a molecular film and an inorganic compound vapor-deposited film are arranged and a heat-sealable resin layer is provided inside the barrier material.   The cylindrical paper container according to claim 1, wherein the barrier polymer film of the barrier material is an ethylene-vinyl alcohol copolymer (EVOH) film.   The cylindrical paper container according to claim 1 or 2, wherein the inorganic compound is aluminum oxide, silicon oxide, tin oxide, magnesium oxide, or a mixture thereof.   The cylindrical paper container according to any one of claims 1 to 3, wherein an aqueous coating layer is formed on a vapor deposition surface of the inorganic compound vapor deposition film of the barrier material.   The cylindrical paper container according to claim 4, wherein the aqueous coating layer comprises a coating layer containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof.   The cylindrical paper container according to claim 4, wherein the aqueous coating layer comprises a coating agent containing a water-soluble polymer and tin chloride.   When the barrier material formed by arranging the barrier polymer film and the inorganic compound vapor-deposited film is arranged so that the vapor deposition surface of the inorganic compound vapor-deposited film and the barrier polymer film face each other, and the container is used as a container, the inorganic compound vapor-deposited The cylindrical paper container according to any one of claims 1 to 6, wherein the film side is disposed inside the container and the barrier polymer film side is disposed outside the container.   The edge protection tape used for the edge protection processing is arranged with at least a barrier polymer film and an inorganic compound vapor deposition film as the barrier material, and provided with a heat sealable resin layer on the front and back of the substrate, and the inorganic compound vapor deposition film It arrange | positions so that the vapor deposition surface of this and the said barrier polymer film may face, and this inorganic compound vapor deposition film side is arrange | positioned at the side which touches the content, The any one of Claims 1-7 characterized by the above-mentioned. Cylindrical paper container.

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