JP2007276791A - Paper cup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper cup in which each layer of a laminated material constituting the paper cup is formed of an environment-friendly, biomass-derived material, the gas barrier properties and the steam barrier properties can be obtained even when any aluminum foil is not provided in the laminated material, any defective seal, liquid leakage or the like can be avoided, and the shelf stability and the storage properties or the like of a content are excellent. <P>SOLUTION: The paper cup comprises a cylindrical cup barrel member and a bottom part member for sealing a bottom part of the cylindrical cup barrel member. The cylindrical cup barrel member and the bottom part member are constituted of a laminated material in which at least a paper base material 2, an adhesive resin layer 3 consisting of a biomass resin composition layer, a barrier layer with a vapor-deposited film 4 of an inorganic oxide being deposited on one side of a biomass plastic oriented film 5, and an innermost layer consisting of a biomass resin composition layer 7 are successively laminated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a paper cup, and more specifically, it is made of a laminate of various members in consideration of the environment, has excellent biodegradability of the container, and has excellent barrier properties that prevent permeation of oxygen gas, water vapor, etc. The present invention relates to a paper cup that avoids defects, liquid leakage, etc., and is excellent in the preservation and storage of contents.

  In the conventional paper cup, the material configuration of the paper cup is generally a configuration in which the base material layer is paper and a heat-sealable resin layer is provided as the innermost layer. There is also a material configuration in which a barrier layer such as an aluminum foil is provided between the innermost layer and the innermost layer. In a paper cup having such a material configuration, the resin of the innermost heat-sealable resin layer mainly uses a polyethylene resin from the viewpoint of heat-sealability, flexibility, etc. From the outside, the material structure such as paper layer / polyethylene resin layer, or the material structure such as polyethylene resin layer / paper layer / polyethylene resin layer, or polyethylene resin layer / paper layer / adhesive layer / aluminum foil / polyethylene resin Material configurations such as layers are known.

However, the above-mentioned resin is a petrochemical-derived resin, and when it is discarded after use, there is a problem that carbon dioxide, which is said to be one of the causes of global warming, is released by combustion.
In addition, the above-mentioned resin is hardly decomposed in a natural environment, remains in the ground, and has a problem of environmental destruction.
In recent years, interest in renewable resources as raw materials, that is, “biomass” has been rapidly increasing, and various biomass-derived materials have been produced.
Among them, as a food packaging material, from a practical viewpoint, a derivative derived from chemical modification of cellulose or starch, or a material derived from biomass represented by polylactic acid is used.
The above polylactic acid is a biomass-derived material made from renewable plants such as corn and sugarcane, and has attracted attention as a polymer that is biodegradable by microorganisms in the soil.
In particular, the above-mentioned polylactic acid has recently been produced in a large amount at a low cost by a fermentation method, and L-lactic acid as a raw material is stable in a normal environment. Since the amount of gas emission is small, the field of use is expected to expand.
As a conventional paper cup, in a paper cup made of paper in which plastic is laminated on at least one side or both sides of the paper, the plastic laminated on the paper is biodegradable mainly composed of biodegradable microorganism-produced polyester or aliphatic polyester. There has been proposed a paper cup characterized by comprising a functional plastic (for example, see Patent Document 1).
JP-A-6-62944

However, biomass-derived materials typified by polylactic acid have poor gas barrier properties and water vapor barrier properties, and there are limits to the application of packaging materials and containers for foods and chemical products.
In addition, when aluminum foil is used as a packaging material in order to provide the above-mentioned barrier properties, it is necessary to incinerate at a high temperature at the time of disposal after use, and it is hardly decomposed in the natural environment and remains in the ground. There was a problem of destruction.

  The problem of the present invention is that each layer of the laminated material constituting the paper cup is made of an environment-friendly material derived from biomass, and without providing an aluminum foil on the laminated material, gas barrier properties, water vapor barrier properties are obtained, Furthermore, it is to provide a paper cup that avoids poor sealing, liquid leakage, etc., and is excellent in the preservation and storage of contents.

  Therefore, in order to solve the above-described problems, in the paper cup of the present invention, in the paper cup including the cylindrical cup body member and the bottom member that seals the bottom of the cylindrical cup body member, the above-described cylindrical cup body. A member and a bottom member, at least a paper base material, an adhesive resin layer comprising a biomass resin composition layer, a barrier layer comprising a structure in which a vapor deposited film of an inorganic oxide is provided on one surface of a biomass plastic stretched film, and A paper cup comprising a laminated material in which innermost layers comprising biomass resin composition layers are sequentially laminated.

  Moreover, the paper cup of the present invention is a paper cup characterized in that, in the above-mentioned configuration, a biomass resin composition layer is further formed on the outer layer of the paper base material.

  Further, the paper cup of the present invention is characterized in that, in any one of the above configurations, the biomass resin composition is made of a polylactic acid resin, and the biomass plastic stretched film is made of a polylactic acid film. It is a paper cup.

According to the paper cup of the present invention, all the layers of the laminated material constituting the cylindrical cup body member and the bottom member that seals the bottom of the cylindrical cup body member are all made from environmentally friendly biomass-derived materials. The entire paper cup is biodegradable, has an environmentally-friendly configuration, and further has a configuration in which a biodegradable gas barrier layer is laminated, and no aluminum foil is provided on the laminated material. However, a gas barrier property and a water vapor barrier property can be obtained, and further, a paper cup excellent in preservability and storage property of contents can be provided by avoiding poor sealing and liquid leakage.
Biomass-derived materials biodegrade within a few months to a year within the animal's body, start degrading in a few weeks when left in soil and seawater, and disappear in about a year to a few years. Since the product becomes lactic acid, carbon dioxide and water, it is harmless to the human body and friendly to the environment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view of a paper cup according to the present invention, FIG. 2 is a perspective view showing an embodiment of a paper cup 20 of the present invention, and FIG. 3 is a development view of FIG.
The paper cup 20 of the present invention is a paper cup composed of a barrel member 13 and a bottom member 14, and a curled portion 11 is formed at the upper end of the barrel portion 12.

FIG. 1 is a cross-sectional view of a paper cup 20 according to the present invention.
As shown in FIG. 1, the laminated body 10 which shows one Example which comprises the paper cup 20 which concerns on this invention is the layer 1 which consists of a biomass resin composition from the surface side, the paper base material layer 2, and adhesive resin. A layer 3 made of a biomass resin composition as a layer, a stretched biomass plastic film layer 5 (barrier layer) formed with a vapor-deposited film 4 of an inorganic oxide, a layer 6 made of a biomass resin composition as an anchor coat layer, and an innermost layer As a basic structure in which layers 7 made of a biomass resin composition are sequentially laminated. The anchor coat layer 6 is not an essential layer, but is a layer that is provided as needed for interlayer adhesion.
In the present invention, the constituent material of each layer of the laminate 10 is biodegradable and is a material using a biological material, so that the material does not cause environmental pollution, etc. Oil resources can also be saved, which is more favorable for the environment.
Further, in the present invention, in the configuration of the laminated material as described above, the surface of the inorganic oxide vapor deposition film constituting the barrier layer is either the surface on the paper base material layer 2 side or the surface on the innermost layer 7 side. However, it is preferable that the lamination is performed so as to be opposed to the surface on the paper substrate side, for example, to exert a barrier effect, and to the contents of the container. This is desirable from the viewpoint of preventing the transition of the odor of poly odor or preventing the occurrence of cracks.
Further, for example, in the present invention, although not shown, the inorganic oxide vapor deposition film constituting the barrier layer is not limited to a single layer film composed of a single layer of the inorganic oxide vapor deposition film, but the same or different inorganic oxide. It may be a multilayer film or a composite film composed of two or more of the vapor-deposited film. Further, in the present invention, other bases may be used depending on the packaging purpose of the paper cup, the contents to be filled and packaged, the purpose of use, the application, etc. It is possible to design and manufacture laminated materials having various forms by arbitrarily laminating materials.

Next, an example of the configuration of the paper cup according to the present invention will be described. As shown in FIG. 3, first, the laminate 10 shown in FIG. 1 is used, and this is used to make the body of the paper cup. The blank plate is formed by punching in accordance with a predetermined shape necessary for the shape, for example, a truncated cone shape, and then the blank plate is wound into a cylindrical shape, and both end portions thereof are partially overlapped, The polymerized portion is subjected to heat treatment such as flame treatment or hot air treatment, and the innermost layer existing in the polymerized portion or the resin layer constituting the outermost layer and the innermost layer is heated and melted, and then a hot plate The cylinder cup body member 13 which comprises a paper cup is manufactured by pressing by means of etc. and performing cylinder sticking and forming a cylinder seal part.
On the other hand, in the present invention, the same laminated material 10 as the above-described laminated material 10 constituting the blank plate is used, and this is punched into a circular shape to produce a circular plate constituting the bottom, and then the circular plate. The bottom member 14 having an upright formed part is manufactured by standing upright molding of the outer periphery of the cylinder.

  Next, in the present invention, the cylindrical cup body member 13 manufactured as described above is inserted into the cylindrical cup body member 13 manufactured as described above, and then the cylindrical cup body member 13 and the bottom member 14 are combined. Hot air or the like is blown to the joining portion to heat and melt the innermost layer existing in the joining portion or the resin layer constituting the outermost layer and the innermost layer, and then the cylindrical shape is formed by a curling die (not shown). The tip of the cup body member 13 is bent inward, and is placed on the upright molding part that constitutes the bottom member 14, and the top part of the cylindrical cup body member 13 and the upright molding part of the bottom member 14 are By knurling the superposed portion from the inner diameter side with a knurl (not shown), the tubular cup body member 13 and the bottom member 14 are closely bonded to form a joint portion, and the tubular shape Cup body member 13 and bottom member 14 To form a paper cup made of.

Thereafter, in the present invention, the end of the tip opposite to the side where the tubular cup body member 13 and the bottom member 14 are tightly bonded to form the joint is removed by the curling die in the same manner as described above. The paper cup according to the present invention is manufactured by curling while bending in the direction to form the upper end flange portion (curl portion 11).
Although not shown, the paper cup manufactured above is delivered to a manufacturer or the like that fills the contents, and then the paper cup is supplied to the content filling machine, and then the contents are put into the paper cup from the opening at its upper end. Then, a paper cup packaging body is manufactured in which the contents are filled and packaged by tightly bonding a lid or the like to the upper flange portion constituting the paper cup and sealing the opening.
Although not shown, in order to prevent the penetration of contents, liquid leakage, etc., the inner end face of the barrel seal portion constituting the cylindrical cup barrel portion is usually subjected to, for example, a skive and hemming treatment. End face processing is performed.
The above illustration is an example of the paper cup according to the present invention, and the present invention is not limited thereby.

Next, in the present invention, the material constituting the paper cup and the like according to the present invention, the production method and the like will be described in more detail. Since it becomes a material, plant-derived material having formability, flex resistance, rigidity, waist, strength, etc. can be used, for example, a strongly sized exposed or unexposed paper base material, or Various paper base materials such as pure white roll paper, kraft paper, paperboard, processed paper, and the like can be used.
Further, in the present invention, as the paper substrate include those having a basis weight of about 80g / m ² ~600g / m ^2-position, preferably it has a basis weight of about 150g / m ² ~300g / m ² of the paper substrate Etc. can be used.
In the present invention, a desired printed picture such as a character, a figure, a picture, a symbol, or the like can be arbitrarily formed on the paper base by a normal printing method.

Next, in the present invention, the barrier layer constituting the paper cup according to the present invention will be described. First, as the base film 5 constituting the barrier layer, an inorganic oxide vapor-deposited film 4 is provided on the barrier film. A plant-derived resin film having excellent properties in terms of physical, physical, chemical, etc., in particular, having strength and toughness, and heat resistance can be used.
Specifically, in the present invention, biodegradable bio-derived base films include, for example, aliphatic polyester resins such as polylactic acid and polybutylene succinate, polyhydroxybutyrate, and polyhydroxyvalerate. Examples thereof include microorganism-produced polyester resins, polyamino acid resins such as poly (γ-glutamic acid), polysaccharides such as cellulose acetate, starch, chitin, chitosan, mannan and pullulan, starch and cellulose resins.
In the present invention, one or a combination of two or more of these can be used. Further, it may be formed by mixing these resins.
In the present invention, it is particularly preferable to use a polylactic acid resin film because of its relatively high strength.
In the present invention, the polylactic acid resin film contains a copolymer and a mixture mainly composed of polylactic acid having biodegradability in addition to polylactic acid. In addition, as a copolymer component for forming a copolymer, hydroxycarboxylic acids such as glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 3-hydroxyvaleric acid, 4-hydroxyvaleric acid, 6-hydroxycaproic acid, etc. are used. it can.
The polylactic acid resin preferably has a weight average molecular weight in the range of 10,000 to 1,000,000. If the molecular weight is less than 10,000, the tensile strength of the film will be insufficient, and if the molecular weight is greater than 1,000,000, It is not preferable because the film becomes difficult.

In the present invention, as the above-mentioned various resin films, for example, one or more of the above-mentioned various resins are used, and an extrusion method, a cast molding method, a T-die method, a cutting method, an inflation method, and the like. A method of forming the above-mentioned various resins alone using a film-forming method such as a method, a method of forming a multilayer coextrusion film using two or more types of resins, and further, 2 Using more than one kind of resin, produce various resin films by the method of forming a film by mixing before film formation, and if necessary, for example, tenter method or tubular method It is possible to use various resin films that are stretched in a uniaxial or biaxial direction using the above.
In the present invention, the film thickness of various resin films or sheets is preferably about 6 μm to 100 μm, more preferably about 9 μm to 50 μm.

In addition, when using one or more of the above-mentioned various resins and forming the film, for example, film processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness Various plastic compounding agents and additives can be added for the purpose of improving and modifying mold release properties, flame retardancy, antifungal properties, electrical properties, strength, etc. Can be arbitrarily added from a very small amount to several tens of percent depending on the purpose.
In the above, general additives include, for example, colorants such as lubricants, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, antistatic agents, lubricants, antiblocking agents, dyes, pigments, and the like. Others can be used, and a modifying resin can also be used.

In addition, in the present invention, the surface of the above-mentioned various resin films may have a desired surface in advance, if necessary, in order to improve close adhesion with a metal or inorganic oxide vapor deposition film described later. A treatment layer can be provided.
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 chemicals, etc. For example, a corona treatment layer, an ozone treatment layer, a plasma treatment layer, an oxidation treatment layer, or the like can be formed and provided.
The above surface pretreatment is carried out as a method for improving the close adhesion between various resin films or sheets and a metal or inorganic oxide vapor-deposited film described later. In addition, for example, on the surface of various resin films or sheets, a primer coat agent layer, an undercoat agent layer, an anchor coat agent layer, an adhesive layer, a vapor deposition anchor coat agent layer, etc. Can be formed arbitrarily to form a surface treatment layer.

  Examples of the pretreatment coating agent layer include polyester resins, polyamide resins, polyurethane resins, epoxy resins, phenol resins, (meth) acrylic resins, polyvinyl acetate resins, polyethylene, and polypropylene. A resin composition comprising a main component of a vehicle such as a polyolefin resin or a copolymer or modified resin thereof, a cellulose resin, or the like can be used.

  Next, in the present invention, the vapor deposition film of the metal or inorganic oxide constituting the barrier layer according to the present invention will be described. As the vapor deposition film of the metal or inorganic oxide, for example, chemical vapor deposition or It can be manufactured by forming a single layer film consisting of one layer of a vapor deposition film of metal or inorganic oxide, or a multilayer film or composite film consisting of two or more layers by using physical vapor deposition or a combination of both. It can be done.

In the present invention, the inorganic oxide vapor-deposited film 4 by the chemical vapor deposition method will be further described. Examples of the inorganic oxide vapor-deposited film by the chemical vapor deposition method include plasma chemical vapor deposition, thermal A vapor deposition film of an inorganic oxide can be formed using a chemical vapor deposition method (Chemical Vapor Deposition method, CVD method) such as a chemical vapor deposition method or a photochemical vapor deposition method.
In the present invention, specifically, a vapor deposition monomer gas such as an organosilicon compound is used as a raw material on one surface of a base film, and an inert gas such as argon gas or helium gas is used as a carrier gas. Furthermore, a vapor deposition film of an inorganic oxide such as silicon oxide can be formed by using a low temperature plasma chemical vapor deposition method using an oxygen gas or the like as an oxygen supply gas and using a low temperature plasma generator or the like.
In the above, for example, high-frequency plasma, pulse wave plasma, microwave plasma, or the like can be used as the low-temperature plasma generator. Thus, in the present invention, highly active and stable plasma is obtained. Therefore, it is desirable to use a high-frequency plasma generator.

In the present invention, a vapor deposition film of silicon oxide formed using a vapor deposition monomer gas such as an organosilicon compound chemically reacts with a vapor deposition monomer gas such as an organosilicon compound and oxygen gas, and the reaction product is It is closely bonded to one surface of the base film to form a dense, flexible thin film, and is usually represented by the general formula SiO _x (where X represents a number from 0 to 2). It is a continuous thin film mainly composed of silicon oxide.
Then, as the deposited film of the silicon oxide, transparency, from the viewpoint of the barrier property and the like, the general formula Si O _X (provided that, X represents represents. A number of 1.3 to 1.9) are represented by A thin film mainly composed of a vapor-deposited film of silicon oxide is preferable.
In the above, the value of X varies depending on the molar ratio of vapor deposition monomer gas to oxygen gas, plasma energy, etc. Generally, the gas permeability decreases as the value of X decreases, but the film itself is yellow. It becomes sexual and becomes less transparent.

In addition, the silicon oxide vapor-deposited film is mainly composed of silicon oxide, and further, at least one compound of carbon, hydrogen, silicon or oxygen, or a compound composed of two or more of these elements is chemically used. It consists of a vapor deposition film contained by bonding or the like.
For example, when a compound having a C—H bond, a compound having a Si—H bond, or a carbon unit is in the form of graphite, diamond, fullerene, or the like, the raw material organosilicon compound or a derivative thereof is further added. It may be contained by a chemical bond or the like.
Specific examples include hydrocarbons having a CH ₃ site, hydrosilica such as SiH ₃ silyl and SiH ₂ silylene, and hydroxyl derivatives such as SiH ₂ OH silanol.
In addition to the above, the type, amount, etc., of the compound contained in the deposited film of silicon oxide can be changed by changing the conditions of the vapor deposition process.
And as said content which said compound contains in the vapor deposition film | membrane of a silicon oxide, about 0.1 to 50%, Preferably about 5 to 20% is desirable.
In the above, if the content is less than 0.1%, the impact resistance, spreadability, flexibility, etc. of the deposited silicon oxide film become insufficient, and scratches, cracks, etc. are likely to occur due to bending, It becomes difficult to stably maintain a high barrier property, and if it exceeds 50%, the barrier property is lowered, which is not preferable.
Furthermore, in the present invention, in the silicon oxide vapor deposition film, the content of the above-mentioned compound is preferably decreased from the surface of the silicon oxide vapor deposition film in the depth direction. On the surface, the impact resistance and the like can be enhanced by the above compound and the like. On the other hand, at the interface with the base film, the content of the above compound is small. This has the advantage that the tight adhesion of the material becomes strong.

In the present invention, for the silicon oxide vapor deposition film, for example, a surface analysis device such as an X-ray photoelectron spectrometer (Xray Photoelectron Spectroscopy, XPS), a secondary ion mass spectrometer (Secondary Ion Mass Spectroscopy, SIMS) or the like. The physical properties as described above can be confirmed by performing elemental analysis of the deposited film of silicon oxide by using a method of analyzing by ion etching in the depth direction.
Further, in the present invention, the film thickness of the above-described silicon oxide vapor deposition film is preferably about 50 to 400 mm, and specifically, the film thickness is preferably about 100 to 1000 mm, In the above, if it is thicker than 1000 mm, and more preferably 4000 mm, cracks and the like are likely to occur in the film, which is not preferable, and if it is less than 100 mm, and less than 50 mm, it is difficult to achieve the effect of barrier properties. Therefore, it is not preferable.
In the above, the film thickness can be measured by the fundamental parameter method using, for example, a fluorescent X-ray analyzer (model name, RIX2000 type) manufactured by Rigaku Corporation.
Further, in the above, as means for changing the film thickness of the silicon oxide vapor deposition film, the volume velocity of the vapor deposition film is increased, that is, the method of increasing the amount of monomer gas and oxygen gas and the vapor deposition rate are slowed down. It can be performed by the method of doing.

Next, in the above, as a monomer gas for vapor deposition of an organic silicon compound or the like that forms a vapor deposition film of an inorganic oxide such as silicon oxide, for example, 1.1.3.3-tetramethyldisiloxane, hexamethyldisiloxane , Vinyltrimethylsilane, methyltrimethylsilane, hexamethyldisilane, methylsilane, dimethylsilane, trimethylsilane, diethylsilane, propylsilane, phenylsilane, vinyltriethoxysilane, vinyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane, phenyltri Methoxysilane, methyltriethoxysilane, octamethylcyclotetrasiloxane, etc. can be used.
In the present invention, among the organosilicon compounds as described above, it is possible to use 1.1.3-3 tetramethyldisiloxane or hexamethyldisiloxane as a raw material, its handleability, formed continuous film In view of the above characteristics and the like, it is a particularly preferable raw material.
Moreover, in the above, as an inert gas, argon gas, helium gas, etc. can be used, for example.

Next, in the present invention, the inorganic oxide vapor-deposited film by the physical vapor deposition method will be described in more detail. Examples of the inorganic oxide vapor-deposited film by the physical vapor deposition method include, for example, vacuum vapor deposition and sputtering. A vapor deposition film of an inorganic oxide can be formed using a physical vapor deposition method (Physical Vapor Deposition method, PVD method) such as a method, an ion plating method, or an ion cluster beam method.
In the present invention, specifically, a metal oxide is used as a raw material, this is heated and vaporized, and this is vapor-deposited on one of the base films, or a metal oxide as a raw material. Used to oxidize by introducing oxygen and oxidize and deposit on one side of the base film, and further use plasma-assisted oxidation reaction deposition method that promotes oxidation reaction with plasma to form a deposited film can do.
In the above, the heating method of the vapor deposition material can be performed by, for example, a resistance heating method, a high frequency induction heating method, an electron beam heating method (EB), or the like.

In the above, as a vapor deposition film of an inorganic oxide, any thin film in which a metal oxide is vapor deposited can be used. For example, silicon (Si), aluminum (Al), magnesium (Mg), calcium ( Deposition of metal oxides such as Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y) A membrane can be used.
A preferable example is a vapor-deposited film of an oxide of a metal such as silicon (Si) or aluminum (Al).
The metal oxide vapor-deposited film can be referred to as a metal oxide such as silicon oxide, aluminum oxide, magnesium oxide, and the notation thereof is, for example, SiO _x , AlO _x , MgO. _X is represented by MOX (wherein M represents a metal element, and the value of X varies depending on the metal element).
Moreover, as a range of said X value, silicon (Si) is 0-2, aluminum (Al) is 0-1.5, magnesium (Mg) is 0-1, calcium (Ca) is 0 to 1, potassium (K) is 0 to 0.5, tin (Sn) is 0 to 2, sodium (Na) is 0 to 0.5, boron (B) is 0 to 1, 5, Titanium (Ti) can have a value in the range of 0 to 2, lead (Pb) in the range of 0 to 1, zirconium (Zr) in the range of 0 to 2, and yttrium (Y) in the range of 0 to 1.5.
In the above, when X = 0, it is a complete metal and is not transparent and cannot be used at all. In addition, the upper limit of the range of X is a completely oxidized value.
In the present invention, generally, examples other than silicon (Si) and aluminum (Al) are scarce, silicon (Si) is 1.0 to 2.0, and aluminum (Al) is 0.5. ~ 1. A value in the range of 5 can be used.
In the present invention, the film thickness of the inorganic oxide vapor-deposited film as described above varies depending on the type of metal oxide used, but is, for example, in the range of 50 to 2000 mm, preferably in the range of 100 to 1000 mm. It is desirable to select and form arbitrarily.
Further, in the present invention, the inorganic oxide vapor-deposited film is used as a metal oxide to be used in one kind or a mixture of two or more kinds to form an inorganic oxide vapor-deposited film mixed with different materials. You can also.

By the way, as an inorganic oxide vapor deposition film constituting the paper cup or the like according to the present invention, for example, two or more layers of different inorganic oxide vapor deposition films using both physical vapor deposition and chemical vapor deposition are combined. It is also possible to use a composite film made of
And, as a composite film composed of two or more layers of the above-mentioned different inorganic oxide vapor-deposited films, first, on the base film, by chemical vapor deposition, it is dense, flexible and relatively An inorganic oxide vapor deposition film capable of preventing the occurrence of cracks is provided, and then an inorganic oxide vapor deposition film formed by physical vapor deposition is provided on the inorganic oxide vapor deposition film, so that two or more layers are formed. It is desirable to constitute a vapor-deposited film of an inorganic oxide composed of a composite film.
In the present invention, contrary to the above, an inorganic oxide vapor deposition film is first provided on the substrate film by physical vapor deposition, and then dense by chemical vapor deposition. An inorganic oxide vapor-deposited film composed of a composite film composed of two or more layers can be formed by providing an inorganic oxide vapor-deposited film that is highly flexible and can prevent the occurrence of cracks.

In the present invention, the surface of the inorganic oxide vapor-deposited film constituting the barrier layer according to the present invention, for example, to improve the tight adhesion between the barrier layer and the adhesive layer, uniaxially stretched film, etc. In addition, a primer agent layer can be formed.
And as said primer agent layer, first, a polyurethane resin or a polyester resin is the main component of the vehicle, and a silane coupling agent 0.05 to Add about 10% by weight, preferably about 0.1% to 5% by weight, about 0.1-20% by weight filler, preferably about 1-10% by weight, and if necessary An additive such as a stabilizer, a curing agent, a crosslinking agent, a lubricant, an ultraviolet absorber, and the like is optionally added, and a solvent, a diluent and the like are added and mixed well to prepare a resin composition.
And using the resin composition prepared above, this is applied to one surface of the aforementioned base film by, for example, roll coating, gravure coating, knife coating, dip coating, spray coating, or other coating methods. Coating is performed on the deposited metal or inorganic oxide deposited film, and then the coating film is dried to remove the solvent, diluent, and the like, and if necessary, an aging treatment or the like is performed. The primer agent layer concerning can be formed.
In the present invention, the thickness of the primer layer is, for example, 0.1 g / m ^{2 to} 5. A position of 0 g / m ² (dry state) is desirable.
In the present invention, the primer layer as described above improves the tight adhesion and the like, and improves the degree of elongation of the primer layer, and is suitable for post-processing such as laminating or box making. To prevent the occurrence of cracks and the like in the deposited film of the inorganic oxide during post-processing.

Next, in the present invention, as the filler constituting the resin composition, for example, calcium carbonate, barium sulfate, alumina white, silica, talc, glass frit, resin powder, and the like can be used. it can.
And said filler adjusts the viscosity etc. of said resin composition liquid, improves the coating suitability and binds it via a silane coupling agent with a polyurethane resin or polyester resin as a binder resin, It improves the cohesive strength of the coating film.

Next, in the present invention, the innermost layer 7 constituting the paper cup according to the present invention will be described. As the innermost layer, specifically, for example, various heat seals that can be melted by heat and fused to each other. And a resin having biodegradability can be used.
In the present invention, as the innermost layer, for example, a polyhydroxycarboxylic acid such as polylactic acid and a resin such as an aliphatic polyester derived from an aliphatic polyhydric alcohol and an aliphatic polycarboxylic acid can be used. it can.
The above resin composition can be formed, for example, by extrusion lamination on a substrate at a resin temperature of about 180 ° C. to 300 ° C.
The thickness of the innermost layer is preferably in the range of 5 μm to 200 μm, and more preferably about 10 μm to 100 μm.

In the present invention, one or more of the above-described resins are used and melt-extruded using an extruder or the like, for example, via an anchor coat agent layer or the like, a melt-extruded resin layer The innermost layer can be formed by melt extrusion lamination.
In the present invention, one or more of the above resins are used, and these are also used as a coextruded laminated resin layer comprising two or more layers obtained by melt coextrusion using a coextrusion machine or the like. In this case, the thickness of the resin layer on the side in contact with the contents is increased, and the thickness of the other resin layer is increased in order to prevent the occurrence of cracks and the like in the deposited film of the inorganic oxide. It is preferable to make it thin, and it is desirable that the thickness of the other resin layer be about 10 μm to 30 μm, preferably about 20 μm.
Furthermore, in the present invention, in order to prevent the occurrence of cracks or the like in the vapor-deposited film of the inorganic oxide, the melt-extrusion resin layer is provided by using the resin constituting the innermost layer as thin as possible. After that, one or more kinds of resins constituting the innermost layer are used on it, and a coextruded resin layer is provided using a coextrusion machine or the like to constitute the innermost layer. it can.
In the present invention, the thickness of the innermost layer is about 5 μm to 200 μm, preferably about 10 μm to 100 μm.
As the anchor coating agent, for example, an anchor coating agent made of vinyl chloride-vinyl acetate copolymer, polyurethane, polylactic acid, or polyester can be used.
In the present invention, the anchor coating agent is coated by roll coating, gravure coating, knife coating, dip coating, spray coating, or other coating method, and the solvent, diluent, etc. are dried to form the anchor coating agent layer. can do.
The application amount of the anchor coating agent is preferably about 0.1 g / m ^{2 to} 5 g / m ² (dry state).

Next, in the present invention, the outermost layer 1 constituting the paper container according to the present invention can be formed by using the same material as that of the innermost layer described above. Various heat sealable biodegradable resins that can be fused can be used.
Specifically, for example, a polyhydroxycarboxylic acid such as polylactic acid and a resin such as an aliphatic polyester derived from an aliphatic polyhydric alcohol and an aliphatic polycarboxylic acid can be used.
The above resin composition can be formed, for example, by extrusion lamination on a substrate at a resin temperature of about 180 ° C. to 300 ° C.
The thickness of the innermost layer is preferably in the range of 5 μm to 200 μm, and more preferably about 10 μm to 100 μm.

Next, the present invention will be described in more detail with reference to examples and comparative examples.
(1) A biaxially stretched polylactic acid film having a thickness of 15 μm is used, and this is attached to a feeding roll of a plasma chemical vapor deposition apparatus, and then the corona-treated surface of the above biaxially stretched polylactic acid film has a thickness. A deposited film of 50 nm silicon oxide was formed.
Next, immediately after forming the silicon oxide vapor deposition film having a thickness of 50 nm as described above, a glow discharge plasma generator is used on the silicon oxide vapor deposition film surface, and the power is 9 kw, oxygen gas: argon gas = 7.0. : Using a mixed gas of 2.5 (unit: slm), performing oxygen / argon mixed gas plasma treatment at a mixed gas pressure of 6 × 10 ⁻⁵ Torr and a processing speed of 420 m / min, and depositing a silicon oxide film surface A plasma-treated surface having a surface tension of 54 dyne / cm or more was formed.
(2) Next, a corona discharge treatment was performed on one surface of the paper substrate [manufactured by Chuetsu Pulp Co., Ltd., trade name: acid-resistant base paper, basis weight 270 g / m ² ], and then the corona discharge. A polylactic acid resin composition (manufactured by Mitsui Chemicals, trade name: Lacia, extruded film thickness: 30 μm) was used as the outermost layer on the treated surface, and this was extrusion coated to form a polylactic acid resin composition layer.
Next, polylactic acid (made by Mitsui Chemicals, trade name: Lacia, extrusion film thickness: 25 μm) is melt-extruded as an adhesive resin on the back surface of the paper substrate layer, and corona is applied to the vapor deposition surface of the vapor deposition film of (1). While performing the treatment, the paper base material layer and the barrier layer were sand-laminated.
(3) Next, on the surface of the base film layer of the barrier layer, a polylactic acid resin (trade name, Laissia, manufactured by Mitsui Chemicals, Inc.) is used, and this is extrusion coated to form a layer structure, polylactic acid resin Composition layer (25 μm) / paper substrate layer (270 g / m ² ) / polylactic acid resin composition layer (25 μm) / deposition layer / biaxially stretched polylactic acid film (15 μm) / polylactic acid resin composition layer (30 μm) A body member laminate according to the present invention was produced.
In addition, the laminated body of the bottom material was manufactured with the same structural material and manufacturing method as said trunk | drum member.
(4) Next, using the laminated material produced above, a frustoconical blank plate for making a body part of a paper cup was punched from the laminated material. Furthermore, end face processing such as skive and hemming was performed.
The direction of the paper eyes is the vertical direction (vertical direction in FIG. 2).
Next, the blank plate is wound into a cylindrical shape, and both end portions thereof are partially overlapped, and the overlapped portion is subjected to a heat treatment such as flame treatment or hot air treatment, and is present in the overlapped portion. A cylindrical cup that constitutes a paper cup by heating and melting the polylactic acid resin composition layer constituting the outermost layer and the innermost layer, and then pressing the plate with a hot plate or the like to form a barrel seal portion The torso was manufactured.
On the other hand, in the same manner as described above, the laminated material manufactured above is used, and this is punched into a circular shape to manufacture a disk constituting the bottom, and then the outer peripheral portion of the disk is raised in a cylindrical shape. Molded to produce a bottom with an upright molded part.
Next, the bottom part manufactured in the same manner is inserted into the cylindrical cup body part manufactured above, and then the cylindrical cup body part and the bottom part are joined by blowing hot air or the like on the joint part. The polylactic acid resin composition layer constituting the outermost layer and the innermost layer present in the part is heated and melted, and then the tip of the cylindrical cup body is bent inward by a curling mold to constitute the above bottom part The above-mentioned cylindrical cup body portion is covered with a knurled portion from the inner diameter side by knurling the overlapped portion of the above-mentioned cylindrical cup body portion with the rising portion of the cylindrical cup body. The bottom part was tightly bonded to form a joint part to form a paper cup bottom part composed of the cylindrical cup body part and the bottom part.
After that, the bottom end of the cylindrical cup barrel is tightly bonded, and the tip end on the side opposite to the side where the joint is formed is curled while being bent outward by the curling die in the same manner as described above. An upper end flange portion was formed to manufacture a paper cup having a capacity of 130 cc according to the present invention.
(5) In the paper cup produced above, no occurrence of pinned pinholes or the like is observed, and further, barrier properties against oxygen gas, water vapor and the like are excellent, and the contents are not altered. In addition, it was able to withstand distribution in the market, and the entire paper cup was biodegradable, harmless to the human body, and friendly to the environment.

[Comparative Example 1]
In Example 1, a laminate was produced in the same manner as in Example 1 except that a stretched film having a silicon oxide vapor deposition film was not used as the barrier layer. Furthermore, using this laminate, a paper cup was produced in the same manner as in Example 1, and the performance was evaluated.

[Performance evaluation results]
The gas barrier property and water vapor barrier property were evaluated as follows. The evaluation results are summarized in Table 1.

(Oxygen permeability)
Using the paper cups obtained in Examples 1 to 3 and Comparative Example 1, the measuring apparatus MODEL CONTROL INC. Was measured according to JIS K7126B method. The measurement was made with OXTRAN. The results are shown in Table 1.
(Water vapor permeability)
Using the paper cups obtained in Examples 1 to 3 and Comparative Example 1, the measuring device MODEL CONTROL INC. Was measured according to JIS K7129B method. Measured with PERMATRAN manufactured by the manufacturer.

As shown in Table 1, the results were good with respect to gas barrier properties and water vapor barrier properties.
However, in Comparative Example 1, none of the gas barrier properties and the water vapor barrier properties were satisfied.

  Applications of the paper cup of the present invention include, for example, beverages, seasonings, or dried confectionery such as snacks, foods and beverages such as curry, stew, and soup, chemicals such as adhesives and adhesives, miscellaneous goods such as cosmetics and pharmaceuticals, Various other articles can be filled and packaged, and there is no particular limitation.

It is sectional drawing which illustrates the biomass laminated body of this invention. It is a perspective view which shows one Example of the paper cup of this invention. FIG. 3 is a development view of FIG. 2.

Explanation of symbols

1 Outermost layer (Bioplus resin composition)
2 Paper base layer 3 Adhesive resin layer (biomass resin composition layer)
4 Deposited inorganic oxide film 5 Stretched bioplastic film layer 6 Anchor coat layer 7 Innermost layer (biomass resin composition layer)
DESCRIPTION OF SYMBOLS 10 Laminated body 11 Top curl part 12 Body part 13 Body member 14 Bottom member 20 Paper cup

Claims (3)

  In a paper cup comprising a cylindrical cup body member and a bottom member that seals the bottom of the cylindrical cup body member, at least the above-mentioned cylindrical cup body member and the bottom member include at least a paper base material and a biomass resin. An adhesive resin layer composed of a composition layer, a barrier layer composed of a vapor deposition film of an inorganic oxide on one side of a stretched biomass plastic film, and an innermost layer composed of a biomass resin composition layer were sequentially laminated. A paper cup comprising a laminated material.   The paper cup according to claim 1, wherein a biomass resin composition layer is further formed on the outer layer of the paper base material. The paper cup according to claim 1 or 2, wherein the biomass resin composition is made of a polylactic acid resin, and the biomass plastic stretched film is made of a polylactic acid film.

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