JP2005153899A - Paper cup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper cup, which has less risk of a leak of a content from a joint between a trunk material and a bottom material, and has an aptitude for processing. <P>SOLUTION: The paper cup is composed of the trunk material made of a lamination for the trunk material, which at least includes a paper base material layer and an innermost layer, and the bottom material made of a lamination for the bottom material, which at least includes a paper base material layer and an innermost layer. The inner layer of the lamination for the trunk material is a polyethylene resin layer, and the inner layer of the lamination for the bottom material is a resin layer containing an ethylene-αolefin copolymer that is given by polymerization using a single-site catalysis. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a paper cup that has a very low risk of content leakage.

  Conventionally, a paper cup is composed of a cylindrical member formed from a substantially fan-shaped body member blank and a bottom member formed from a circular bottom member blank, and both edges of the body member blank are pasted by body bonding. In addition, the lower part of the body member is folded inwardly, and the bent part obtained by bending the periphery of the bottom member blank downward along the circumference is sandwiched between the body member and the bottom member. A top curl portion is formed by curling the upper opening edge outward.

  In addition, as a material of the laminate used for the body member and the bottom member, a laminate mainly made of paper is used, and the innermost layer, or both the innermost layer and the outermost layer are made of heat such as polyethylene resin. A layer made of a plastic resin is laminated.

  As described above, in the processing step of forming the paper cup, the body bonding and the joining between the body member and the bottom member are performed by thermal bonding, so the innermost layer of the body member and the bottom member is made of a thermoplastic resin that can be thermally bonded. Among them, low density polyethylene resins are widely used. This low-density polyethylene resin is used to produce with great care, but there are still problems such as poor sealing due to variations in molding conditions and leakage due to pinholes and missing seals. is there.

In order to improve such a problem, a paper cup using an ethylene-α / olefin copolymer polymerized by using a single-site catalyst having better heat sealability for the innermost layer of the body member and the bottom member has also been proposed. (For example, refer to Patent Document 1).
JP-A-9-76375

  However, when an ethylene-α-olefin copolymer polymerized using a single-site catalyst is used for the innermost layer of the laminate used for the body member and the bottom member of this paper cup, it is particularly punched to produce a body member blank. In the process, a part of the ethylene-α / olefin copolymer resin layer polymerized using a single-site catalyst remains uncut, and even if the remaining part is torn and cut, Troubles such as tearing are likely to occur, and troubles such as slippage in the feeder portion have occurred. Also, in the paper cup molding machine, the heat sealing performance for joining the barrel member and the bottom member will be improved, but due to poor insertion of the drum blank due to slippage of the barrel member blank and low melting point The rigidity of the container was lowered by heating, causing troubles such as molding defects.

  The present invention has been made in view of the circumstances as described above, and the object thereof is extremely low risk of occurrence of leakage from the joint portion between the trunk member and the bottom member, and processing. The object is to provide a paper cup excellent in suitability.

  In order to solve the above problems, the present invention provides a body member using a body member laminate comprising at least a paper base material layer and an innermost layer, and a bottom member laminate comprising at least a paper base material layer and an innermost layer. In the paper cup comprising the bottom member used, the innermost layer of the body member laminate used for the body member is a polyethylene resin layer, and the innermost layer of the bottom member laminate used for the bottom member is a single site catalyst. A paper cup comprising a resin layer containing an ethylene-α-olefin copolymer polymerized using

  Further, the innermost layer of the laminate for the bottom member is a coextruded resin layer of low density polyethylene and an ethylene-α olefin copolymer polymerized using a single site catalyst, and the low density polyethylene is used as the paper base material. On the layer side, the ethylene-α-olefin copolymer polymerized by using a single site catalyst can be the innermost side opposite to the layer.

  According to the carton blank of the present invention, polyethylene resin is used for the innermost layer of the body member laminate used for the body member, and heat sealability is good for the innermost layer of the bottom member laminate used for the bottom member. Use of an ethylene-α / olefin copolymer polymerized with a simple single-site catalyst improves the heat sealability at the joint between the body member and the bottom member, and the risk of content leakage Can obtain a very small paper cup. That is, when the bottom member and the body member are joined with hot air, as shown in FIG. 7, since the hot air is directly applied to the sealing surface of the body member, the amount of heat necessary for sealing is sufficiently distributed. Since the sealing surface of the material is heated through the paper layer, the necessary amount of heat is difficult to reach and more heat capacity is required. Therefore, effective sealing can be achieved by using only the bottom member of a metallocene resin that can be sealed even with a smaller heat capacity.

  Also, the innermost layer of the bottom member laminate used for the bottom member uses an ethylene-α-olefin copolymer polymerized using a single-site catalyst with good heat sealability, whereas The innermost layer of the laminate for body member used is not an ethylene-α / olefin copolymer polymerized using a single site catalyst, but a polyethylene resin, so that it is punched in the manufacturing process of the body member blank. There is no defect and slip failure, and the processability is good, and there is no slippage failure in the molding process of the paper cup, and the processability of the paper cup is improved.

  Furthermore, by forming the innermost layer by coextrusion with low-density polyethylene, etc., low-temperature polyethylene with better fluidity than metallocene resins can be obtained at high shear rates while improving low-temperature sealing and hot tack properties on the surface. By using it for coextrusion, when the bottom member is squeezed, a resin reservoir can be made more effectively between the wrinkles that can be formed in the bent portion, and the occurrence of leakage can be prevented. In addition, the cost is lower than when the innermost layer is formed of an ethylene-α / olefin copolymer polymerized using a single site catalyst.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. First, an example of the configuration of a laminated body or the like constituting a paper cup according to the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway front view of the paper cup according to the present invention. 3 and 4 are schematic cross-sectional views showing an example of the layer structure of the laminated body constituting the paper cup according to the present invention. Next, an example of the configuration of the paper cup according to the present invention will be described with reference to the drawings. FIG. 5, FIG. 6, FIG. 7, FIG. It is a schematic block diagram which shows the structure of the paper cup in the paper cup formation process about the paper cup concerning invention.

  As shown in FIG. 1, the paper cup A of the present invention is formed of a substantially fan-shaped body member blank 10 that becomes a cylindrical body member 1 and a circular bottom member blank 20 that becomes a bottom member 2. The both ends of the member blank 10 are bonded together to form a cylinder, the lower part of the body member 1 is folded inward, and the bent part 21 in which the peripheral edge of the bottom member blank 20 is folded downward along the circumference is sandwiched. 1 and the bottom member 2 are joined. Then, the top curl 11 is formed by curling the upper opening edge outward.

  As shown in FIG. 2A, at least a paper base material layer 101 which is a main material and an innermost layer of polyethylene resin are used as the body member laminate 100 used for the body member 1 constituting the paper cup A according to the present invention. The bottom member laminate 200 used in the bottom member 2 is composed of a paper base layer 201 and a single site catalyst as the main material, as shown in FIG. The basic structure is composed of the innermost layer 202 of a polymerized ethylene-α / olefin copolymer.

  Next, specific examples of the body member laminate 100 used for the body member 1 of the paper cup A and the bottom member body 200 used for the bottom member 2 according to the present invention will be described. As shown in FIG. 3A, the member laminate 100A is composed of a paper base layer 101 as a main material, an innermost layer 102 of a polyethylene resin, and an outermost layer 103 of a thermoplastic resin having heat sealing properties. As shown in FIG. 3B, the bottom member laminate 200A used for the bottom member 2 is an ethylene-α · olefin polymerized using a paper base layer 201 as a main material and a single site catalyst. The combination which is the structure which consists of the innermost layer 202 of a copolymer and the outermost layer 203 of the thermoplastic resin which has heat sealing property can be illustrated.

  Next, with respect to the body member laminate 100 used for the body member 1 of the paper cup A according to the present invention and the bottom member laminate body 200 used for the bottom member 2, another specific example is illustrated. As shown in FIG. 4A, the body member laminate 100B includes a paper base layer 101 as a main material, an innermost layer 102 of polyethylene resin, an outermost layer 103 of a thermoplastic resin having heat sealing properties, and paper. The bottom member laminate 200A used for the bottom member 2 is a main material as shown in FIG. 4-b. The bottom member 2 has a structure composed of a barrier layer 104 provided between the base material layer 101 and the innermost layer 102. Base material layer 201, innermost layer 202 of an ethylene-α / olefin copolymer polymerized using a single site catalyst, outermost layer 203 of a thermoplastic resin having heat sealability, and paper base material layer 201 and innermost layer 202 The combinations are composed of a barrier layer 104 constituting provided between can be exemplified.

  The above illustrations are examples of the bottom member laminate used for the paper cup A according to the present invention, and the present invention is not limited thereby. For example, in the paper cup A of the present invention, another base material is arbitrarily laminated depending on the purpose of packaging, the contents to be filled and packaged, its purpose of use, usage, etc., and laminated for bottom members having various forms. The body can be designed and manufactured.

  Next, an example of the paper cup manufacturing method according to the present invention will be described. The body member laminate 100 used for the body member 1 and the bottom member laminate 200 used for the bottom member 2 were used. For example, as shown in FIG. 5, first, the body member laminate 100 is punched into a substantially sector shape, which is a predetermined shape necessary for making the truncated cone body member 1 of the paper cup A, in a punching process. Thus, the body member blank 10 is produced. This punching process can be performed by a known punching machine using a known punching die. Next, the body member blank 10 is rolled into a cylindrical shape, and both end portions thereof are partially overlapped, and a heat treatment such as a flame treatment or a hot air treatment is performed on the overlapped portion, so that it exists in the overlapped portion. The innermost layer 102 or the resin layer constituting the innermost layer 102 and the outermost layer 103 is heated and melted, and is then pressed by a hot plate or the like to form a cylinder seal portion 11 to form a paper cup A The cylindrical trunk | drum member 1 which comprises is manufactured. On the other hand, as shown in FIG. 6, the bottom member laminate 200 described above is punched into a circular shape in a process in a paper cup molding machine to manufacture a bottom member blank 20 constituting the bottom member 2, and then this bottom member blank The bottom member 2 having the bent portion 21 is manufactured by erecting the outer peripheral portion of the tube 20 into a cylindrical shape.

  Next, the bottom member 2 manufactured in the same manner is inserted into the cylindrical body member 1 manufactured as described above, and then the cylindrical body member 1 and the bottom member 2 are connected as shown in FIG. Then, hot air is blown from the hot air device P to the joint portion to heat and melt the innermost layer 102 on the inner surface of the body member 1 and the innermost layer 202 on the inner surface of the bottom member 2 at the joint portion. Next, as shown in FIG. 8A, the lower end portion 12 of the cylindrical body member 1 is bent inward by the curling die Q, and is covered with the bent portion 21 of the bottom member 2 described above. As shown in -b, by knurling the overlapping portion of the lower end portion 12 of the cylindrical barrel member 1 and the bent portion 21 of the bottom member 2 from the inner diameter side by a knurl R, the cylindrical barrel portion described above is obtained. The joint 1 is formed by thermally bonding the member 1 and the bottom member 2, and the paper cup bottom portion including the cylindrical body member 1 and the bottom member 2 is formed.

  Thereafter, as shown in FIG. 9, the upper end portion 13 opposite to the side to which the bottom member 2 of the cylindrical body member 1 is closely bonded is joined to the outside by a curling die in the same manner as described above. The paper cup A according to the present invention is manufactured by curling while bending to form the top curl portion 14 at the upper end.

  And although not shown in figure, the paper cup A manufactured above is delivered to the manufacturer etc. which fill a content, Then, this paper cup A is supplied to a content filling machine, Then, in the paper cup A, opening of the upper end is carried out. Then, the contents are filled from the portion, and then the top curl portion 14 of the paper cup A is tightly bonded with a lid material or the like, and the opening is sealed to produce a paper cup package filled with the contents. . Although not shown, the inner end surface of the barrel seal portion 11 of the cylindrical barrel member 1 is usually subjected to, for example, skive-hemming treatment in order to prevent permeation of contents, liquid leakage, etc. Processing is in progress.

  The above illustration shows an example of the paper cup according to the present invention, and the present invention is not limited thereby. Of course, in the present invention, a paper cup similar to the above can be manufactured in the same manner as described above by using the bottom member laminate shown in FIGS.

Next, the material of each layer of the body member laminate 100 used for the body member 1 constituting the paper cup A according to the present invention and the bottom member laminate 200 used for the bottom member 2 will be described in more detail. Since the paper base material layer 101 of the member laminate 100 and the paper base material layer 201 of the bottom member laminate 200 are the basic materials constituting the paper cup, the moldability, flex resistance, rigidity, waist, Can be used, for example, high-size bleached or unbleached paper, or various types of paper such as pure white roll paper, kraft paper, paperboard, and processed paper. . In the present invention, the paper base layer 101 and the paper base layer 201 are those having a basis weight in the range of about 80 to 600 g / m ² , preferably in the range of the basis weight of about 100 to 500 g / m ² . Paper can be used. In the present invention, on the paper base material layer 101 and the paper base material layer 201, for example, desired print patterns such as characters, figures, patterns, symbols, etc. are arbitrarily formed by a normal printing method. It is something that can be done.

  Next, the material of the innermost layer 102 of the body member laminate 100 used for the body member 1 constituting the paper cup according to the present invention will be described. As the innermost layer 102, various kinds of materials that can be melted by heat and fused to each other. Polyethylene resin having a heat seal property such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear (linear) low density polyethylene can be used. In the present invention, one or more of the above-described resins are used, and this is melt-extruded using an extruder or the like, for example, the melt-extruded resin layer is melted via an anchor coating agent layer or the like. By extrusion laminating or using one or more of the above-mentioned resins, a resin film or sheet is produced in advance, and the resin film or sheet is used as an adhesive layer for laminating, etc. The innermost layer 102 can be formed by carrying out dry lamination lamination via. When laminating the innermost layer 102 in this way, it is preferable to perform a desired surface treatment on the surface to be laminated, such as the paper base material layer 101, in advance in order to improve the close adhesion with the innermost layer 102. Examples thereof include corona discharge treatment, ozone treatment, flame treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, and the like.

  In the present invention, one or more of the above-described resins are used, and these are also used as a co-extruded laminated resin layer composed of two or more layers obtained by melt-coextrusion using a co-extruder 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 in the range of 10 to 30 μm, preferably around 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-extruded resin layer is made as thin as possible by using the resin constituting the innermost layer 102. After being provided, the innermost layer 102 is formed by using one or more of the above-mentioned resins constituting the innermost layer and providing a coextruded resin layer using a coextrusion machine or the like. be able to. In the present invention, the thickness of the innermost layer 102 is in the range of 5 to 200 μm, preferably in the range of 10 to 100 μm.

  Next, the material of the innermost layer 202 of the bottom member laminate 200 used for the bottom member 2 constituting the paper cup according to the present invention will be described. The innermost layer 202 is usually melted by heat and fused to each other. The resin to be obtained, specifically, a low-density polyethylene, or a polyolefin resin such as a linear (linear) low-density polyethylene is used. In that case, the low-density polyethylene or , The sealing temperature by the polyolefin resin layer such as linear (linear) low density polyethylene is in the range of 320-350 ° C, and because of the extremely high sealing temperature, pinholes are generated, sealing failure, liquid leakage It is easy to cause etc. Therefore, in the present invention, paying attention to an ethylene-α-olefin copolymer polymerized using a metallocene catalyst having a low temperature sealability, the innermost layer 202 is formed thereby, and a low temperature seal in the range of 250 to 300 ° C. is formed. It is possible to prevent a leak by filling a wrinkle portion generated when the bent portion 21 of the bottom member 2 is formed, to prevent a pinhole, and to avoid a sealing failure, a liquid leak, and the like. . Furthermore, the ethylene-α / olefin copolymer polymerized using a metallocene catalyst has the advantage of improving impact resistance with less propagation of fracture because it has adhesiveness. Since it is always in contact with the contents, it is also effective for preventing deterioration of environmental stress cracking resistance. In the present invention, another resin can be blended with the ethylene-α / olefin copolymer polymerized using a metallocene catalyst. For example, by blending an ethylene-butene copolymer, Although it is inferior in heat resistance and tends to deteriorate the seal stability in a high temperature environment, there is an advantage that the tearability is improved and it contributes to easy opening.

  Examples of the ethylene-α / olefin copolymer polymerized using the above metallocene catalyst include, for example, a catalyst by a combination of a metallocene complex and an alumoxane such as a catalyst by a combination of zirconocene dichloride and methylalumoxane; The ethylene-α-olefin copolymer obtained by copolymerizing ethylene and α-olefin can be used. The above metallocene catalyst is also called a single-site catalyst because the current catalyst is called a multi-site catalyst with non-uniform active sites (below, the active sites are uniform). The metallocene catalyst has the same meaning as the single-site catalyst.) Specifically, as an ethylene-α / olefin copolymer polymerized using a metallocene catalyst, trade name “Kernel” manufactured by Mitsubishi Chemical Corporation, trade name “Evolue” manufactured by Mitsui Petrochemical Co., Ltd., Product name “EXACT” manufactured by EXXON CHEMICAL, USA, product name “AFFINITY”, product name “ENGAGE” manufactured by DOW CHEMICAL, USA, etc. An ethylene-α-olefin copolymer polymerized using a metallocene catalyst can be used.

  In the present invention, when laminating an ethylene-α / olefin copolymer polymerized using a metallocene catalyst as the innermost layer 202, a desired surface is formed on the surface to be laminated in order to increase the tight adhesion to the innermost layer 202 in advance. It is preferable to perform treatment, and as this surface treatment, for example, anchor coating treatment, corona discharge treatment, flame treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, chemicals, etc. are used. And oxidation treatment. The film thickness of the innermost layer 202 is in the range of 10 to 300 μm, preferably in the range of 20 to 100 μm.

  The ethylene-α / olefin copolymer polymerized using the metallocene catalyst will be described in more detail. Specifically, for example, a catalyst comprising a combination of a metallocene-based transition metal compound and an organoaluminum compound, that is, a metallocene catalyst ( An ethylene-α-olefin copolymer obtained by copolymerizing ethylene and an α-olefin can be used. In addition, said metallocene catalyst may be supported and used for an inorganic substance. In the above, examples of the metallocene transition metal compound include a transition metal selected from group IVB, specifically, titanium (Ti), zirconium (Zr), hafnium (Hf), cyclopentadienyl group, substituted cyclohexane. 1 to 2 of a pentadienyl group, an indenyl group, a substituted indenyl group, a tetrahydroindenyl group, a substituted tetrahydroindenyl group, a fluoronyl group, and a substituted fluorenyl group, or two of these groups Those covalently bonded are bonded, and in addition, hydrogen atom, oxygen atom, halogen atom, alkyl group, alkoxy group, aryl group, acetylacetonate group, carbonyl group, nitrogen molecule, oxygen molecule, Lewis base, silicon Those having ligands such as substituents containing atoms and unsaturated hydrocarbons can be used. . In the above, as the organoaluminum compound, alkylaluminum, chain or cyclic aluminoxane, or the like can be used. Here, as the alkylaluminum, for example, triethylaluminum, triisobutylaluminum, dimethylaluminum chloride, diethylaluminum chloride, methylaluminum dichloride, ethylaluminum dichloride, dimethylaluminum fluoride, diisobutylaluminum hydride, diethylaluminum hydride, ethylaluminum sesquichloride. Etc. can be used. The chain or cyclic aluminoxane can be produced, for example, by bringing alkyl aluminum into contact with water. For example, it can be produced by adding alkylaluminum at the time of polymerization and adding water later, or by reacting crystallization water of a complex salt or adsorbed water of an organic / inorganic compound with alkylaluminum. Next, in the above, as the inorganic substance for supporting the metallocene catalyst, for example, silica gel, zeolite, silicon earth or the like can be used.

Next, in the above, as the polymerization method, for example, various polymerization methods such as bulk polymerization, solution polymerization, suspension polymerization, and gas phase polymerization can be used. In addition, the polymerization may be any method such as a batch method or a continuous method. In the above, polymerization conditions are a polymerization temperature, −100 to 250 ° C., a polymerization time, 5 minutes to 10 hours, a reaction pressure, and a normal pressure to 300 kg / m ² . Furthermore, in the present invention, examples of the α-olefin that is a comonomer copolymerized with ethylene include propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-hexene, 1 -Octene, decene, etc. can be used. The above α · olefin fin may be used alone or in combination of two or more. Moreover, the mixing ratio of the above-mentioned α · olefin fin is, for example, 1 to 50% by weight, preferably 10 to 30% by weight.

  That is, the physical properties of the ethylene-α-olefin copolymer polymerized using a metallocene catalyst that can be suitably used in the present invention has a density in the range of 0.88 to 0.92 g / cm 3, preferably 0.8. Those in the range of 90 to 0.915 g / cm 3 are used. When the density is less than 0.88 g / cm @ 3, the suitability for punching the bottom member blank 20 in a circular shape with a paper cup molding machine is deteriorated. On the other hand, when the density exceeds 0.992, the body member 1 is joined. The heat sealability is deteriorated. The melt flow rate (MFR) is preferably in the range of 0.1 to 50 g / 10 min, and the melting point (Tm) is preferably in the range of 80 to 120 ° C.

  In the present invention, the ethylene-α / olefin copolymer polymerized using the above metallocene catalyst includes, for example, an antioxidant, an ultraviolet absorber, an antistatic agent, an antiblocking agent, a lubricant (fatty acid amide, etc.). ), Flame retardants, inorganic or organic fillers, dyes, pigments and the like can be optionally added and used.

  Furthermore, as the innermost layer 202 composed of a resin layer containing an ethylene-α / olefin copolymer polymerized by a metallocene catalyst in the present invention, an ethylene-α / olefin copolymer polymerized by a metallocene catalyst is laminated alone. In addition to the method of layering, an ethylene-α / olefin copolymer polymerized by a metallocene catalyst and a polyolefin resin such as low density polyethylene and linear low density polyethylene are laminated together, and the coextrusion The innermost layer 202 can be laminated by a method of coextrusion with the ethylene-α · olefin-based resin layer polymerized by the metallocene catalyst constituting the layer laminated at the innermost side. In the above, as a method of forming a co-extrusion laminated resin layer, it can be performed using a T-die co-extrusion method or the like, and the layer structure is a co-extrusion laminated resin layer composed of two or more layers. Furthermore, it is desirable that the thickness of each resin layer is arbitrarily adjusted within the range of 2 to 30 μm, and the thickness ratio (ethylene-α olefin copolymer resin polymerized using a single site catalyst) Layer / low density polyethylene resin layer) is in the range of 0.05 to 1.50, preferably in the range of 0.2 to 1.0. When this ratio is less than 0.05, the ethylene-α olefin copolymer resin polymerized using a single site catalyst cannot achieve the effects such as low-temperature sealability and prevention of pinholes, and exceeds 1.5. If so, the cost is high.

  Next, the outermost layer 103 of the body member laminate 100 used in the body member 1 constituting the paper member 1 constituting the paper cup according to the present invention and the outermost layer 203 of the bottom member laminate 200 used in the bottom member 2 are melted by heat. In addition, polyolefin resins having various heat sealing properties that 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-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 Polyolefin resins such as methylpentene polymer, polybutene polymer, polyethylene or polypropylene modified with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, Vinyl acetate resin, Can be used re (meth) acrylic resin, resins such as polyvinyl chloride resin. In the present invention, one or more of the above-described resins are used and melt-extruded using an extruder or the like, and, for example, an anchor coating agent layer is formed on one surface of a paper substrate. Or the like, or by using one or more of the above-mentioned resins by laminating the melt-extruded resin layer through a melt-extrusion resin layer or the like. The outermost layer 103 and the outermost layer 203 can be formed by carrying out dry lamination lamination | stacking of the film | membrane thru | or a sheet | seat through the adhesive bond layer for lamination on one side of a paper base material. When laminating the outermost layer 103 and the outermost layer 203 in this way, a desired surface treatment is performed on the surface to be laminated such as the paper base material layer 101 in order to improve the tight adhesion with the outermost layer 103 and the outermost layer 203 in advance. As this surface treatment, for example, corona discharge treatment, ozone treatment, flame treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, etc. Is mentioned. In the present invention, the thickness of the outermost layer is in the range of 5 to 200 μm, preferably in the range of 10 to 100 μm.

  Next, the barrier layer 104 of the trunk member laminate 100 used for the trunk member 1 constituting the paper cup according to the present invention and the barrier layer 204 of the bottom member laminate 200 used for the bottom member 2 will be described. The barrier layer 204 is composed of a metal foil, a resin layer, or a metal film or an inorganic oxide film and a gas barrier coating film on one surface of the base film.

  First, as the metal foil, for example, a foil made of aluminum, iron, stainless steel, zinc, gold, silver, copper, and alloys thereof, aluminum is mainly used, and the thickness is preferably in the range of 6 to 25 μm. Is.

  Next, as the resin layer, for example, polyethylene resin, polypropylene resin, cyclic polyolefin resin, fluorine resin, polystyrene resin, ethylene vinyl alcohol copolymer, acrylonitrile-styrene copolymer (AS resin), acrylonitrile butadiene. -Styrene copolymer (ABS resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, and polyamides such as various nylons Resin, polyimide resin, polyamideimide resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin, resin Tar-based resin, may be used various resins such as cellulose resins. Among these, an ethylene vinyl alcohol copolymer or a polyamide resin can be preferably used.

  In addition, the base film for forming a metal vapor-deposited film or an inorganic oxide vapor-deposited film has excellent properties in mechanical, physical, chemical, etc., and is particularly strong and tough. A film or sheet of a resin having heat resistance can be used. Specifically, 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. Polymer (ABS resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resin such as polyethylene terephthalate and polyethylene naphthalate, various polyamide resins such as nylon, Polyimide resin, polyamideimide resin, polyarylphthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin, acetal resin, cellulose Various resins of the scan-based resin film or sheet can be used. In addition, when providing the vapor deposition film | membrane of an inorganic oxide, it is especially preferable to use the film | membrane thru | or sheet | seat of a polypropylene resin, a polyester-type resin, and a polyamide-type resin.

  In the present invention, the above-mentioned various resins can be used as a film or a sheet. For example, one or more of the above-mentioned various resins are used, extrusion method, cast molding method, T-die method, cutting method. , A method of forming the above-mentioned various resins alone using a film-forming method such as an inflation method, or a method of forming a multi-layer coextrusion film using two or more types of resins, Uses two or more kinds of resins, and produces a film or sheet of various resins by a method of forming a film by mixing before forming into a film, and if necessary, for example, a tenter method, Alternatively, various resin films or sheets formed by stretching in a uniaxial or biaxial direction using a tubular method or the like can be used. In the present invention, the film thickness of various resin films or sheets is preferably in the range of 6 to 100 μm, more preferably in the range of 9 to 50 μm.

  It should be noted that one or more of the above-mentioned various resins are used, and in forming the film, for example, film processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness In addition, 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. A very small amount to several tens of percent can be arbitrarily added 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. Etc., and further, a modifying resin or the like can also be used.

  The metal vapor deposition layer is, for example, a vapor deposition layer made of one material selected from the group consisting of aluminum, copper, zinc, gold, silver, and alloys thereof.

  In the present invention, the surface of each of the above-mentioned various resin films or sheets may be used as necessary in order to improve the tight adhesion with a metal vapor-deposited film or an inorganic oxide vapor-deposited film described later. It is preferable to provide a desired surface treatment layer in advance. Examples of the surface treatment layer include corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, chemicals, etc. A corona treatment layer, an ozone treatment layer, a plasma treatment layer, an oxidation treatment layer, and the like can be provided by optionally performing a pretreatment such as an oxidation treatment using the above. The above-mentioned surface pretreatment is carried out as a method for improving the adhesiveness between various resin films or sheets and an inorganic oxide vapor-deposited film to be described later, but the method for improving the above-mentioned adhesiveness. In addition, for example, a primer coat agent layer, an undercoat agent layer, an anchor coat agent layer, an adhesive layer, or a deposition anchor coat agent layer is arbitrarily formed in advance on the surface of various resin films or sheets. And it can also be set as 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, the inorganic oxide vapor deposition film constituting the barrier layer 104 and the barrier layer 204 according to the present invention will be described in detail. As the inorganic oxide vapor deposition film, for example, chemical vapor deposition or physical vapor deposition can be used. It can be manufactured by forming a single layer film composed of one layer of an inorganic oxide vapor-deposited film, a multilayer film composed of two or more layers, or a composite film by using a phase growth method or a combination of both. .

  The inorganic oxide vapor-deposited film 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 and thermal chemical vapor deposition. 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 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, a high-frequency plasma, a pulse wave plasma, a microwave plasma, or the like can be used as the low-temperature plasma generator. Thus, in the present invention, a highly active and stable plasma is obtained. For this purpose, it is desirable to use a high-frequency plasma generator.

  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. Thus, preferable examples include vapor-deposited films of metal oxides such as silicon (Si) and aluminum (Al). Thus, the above metal oxide vapor deposition film can be referred to as a metal oxide such as silicon oxide, aluminum oxide, magnesium oxide, etc., and its notation is, for example, SiOx, AlOx, MgOx. 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 take values 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. 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 poor, silicon (Si) is in the range of 1.0 to 2.0, and aluminum (Al) is 0. A value in the range of .5 to 1.5 can be used. In the present invention, the film thickness of the inorganic oxide vapor-deposited film as described above varies depending on the metal used, the type of metal oxide, or the like, but is, for example, in the range of 50 to 2000 mm, preferably 100 to 1000 mm. It is desirable to select and form arbitrarily within the range. Further, in the present invention, the inorganic oxide vapor-deposited film is a metal to be used, or the metal oxide is one or a mixture of two or more, and mixed with different materials. A vapor deposition film can also be comprised.

  By the way, in this invention, as a vapor deposition film of the inorganic oxide which comprises the paper cup etc. concerning this invention, for example, the vapor deposition film of different inorganic oxides using both physical vapor deposition and chemical vapor deposition together It is also possible to form and use a composite film composed of two or more layers. Thus, as a composite film composed of two or more layers of the above-mentioned different types of inorganic oxide vapor-deposited films, first, on the base film, it is dense and flexible by chemical vapor deposition. 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 to form two or more layers. It is desirable to constitute an inorganic oxide vapor-deposited film made of a composite film made of Of course, in the present invention, contrary to the above, an inorganic oxide vapor-deposited film is first provided on the base film by physical vapor deposition, and then dense by chemical vapor deposition. It is also possible to provide an inorganic oxide vapor deposition film composed of a composite film composed of two or more layers by providing an inorganic oxide vapor deposition film that is highly flexible and can relatively prevent the occurrence of cracks. is there.

  Next, in the present invention, the gas barrier coating film constituting the barrier layer according to the present invention will be described. As the gas barrier coating film, at least a polyvinyl alcohol resin [hereinafter referred to as component (A)]. And R1 m M (OR2) n (1) (wherein M represents a metal atom, R1 is the same or different and represents an organic group having 1 to 8 carbon atoms, R2 Are the same or different and each represents an alkyl group having 1 to 5 carbon atoms or an acyl group or phenyl group having 1 to 6 carbon atoms, m and n each represents an integer of 0 or more, and m + n represents the valence of M. A metal alcoholate, a hydrolyzate of the metal alcoholate, a condensate of the metal alcoholate, a chelate compound of the metal alcoholate, and a hydrolysis of the chelate compound At least one selected from the group of products and metal acylates [hereinafter referred to as component (B). And a gas barrier coating film made of a gas barrier composition containing In the above, the gas barrier composition preferably contains a nitrogen-containing organic solvent, and is also referred to as inorganic fine particles [hereinafter referred to as component (C). ] Is also preferable. In the above, as the component (B), the component (B) is hydrolyzed in water or a mixed solvent containing water and a hydrophilic organic solvent, and then mixed with the component (A) to prepare a gas barrier composition. Is something that can be done.

  In addition, the gas barrier composition of the present invention is separately filled in order to develop various properties such as coloring of the obtained coating film, thickening of the coating film, prevention of UV transmission to the base, provision of corrosion resistance, and heat resistance. It is also possible to add and disperse the material. However, the filler excludes the component (C). Examples of the filler include water-insoluble pigments such as organic pigments and inorganic pigments, and particles, fibers, scale-like metals and alloys, and oxides, hydroxides, carbides, and nitrides thereof. And sulfides. Specific examples of the filler include particulate, fibrous or scale-like iron, copper, aluminum, nickel, silver, zinc, ferrite, carbon black, stainless steel, silicon dioxide, titanium oxide, aluminum oxide, chromium oxide. , Manganese oxide, iron oxide, zirconium oxide, cobalt oxide, synthetic mullite, aluminum hydroxide, iron hydroxide, silicon carbide, silicon nitride, boron nitride, clay, diatomaceous earth, slaked lime, gypsum, talc, barium carbonate, calcium carbonate, Magnesium carbonate, Barium sulfate, Bentonite, Mica, Zinc green, Chrome green, Cobalt green, Viridian, Guinea green, Cobalt chromium green, Shere green, Green earth, Manganese green, Pigment green, Ultramarine, Bituminous, Pigment green, Rock ultramarine, Cobalt blue, cerulean blue, copper borate, molyb Blue, Copper sulfide, Cobalt purple, Mars purple, Manganese purple, Pigment violet, Lead oxide, Calcium lead acid, Zinc yellow, Lead sulfide, Chrome yellow, Ocher, Cadmium yellow, Strontium yellow, Titanium yellow, Resurge, Pigment yellow, Cuprous oxide, cadmium red, selenium red, chromium vermilion, bengara, zinc white, antimony white, basic lead sulfate, titanium white, lithopone, lead silicate, zircon oxide, tungsten white, lead zinc white, bunchison white, phthalate Lead acid, manganese white, lead sulfate, graphite, bone black, diamond black, thermatomic black, vegetable black, potassium titanate whisker, molybdenum disulfide, and the like.

  The average particle diameter or average length of these fillers is usually in the range of 50 to 50000 nm, preferably in the range of 100 to 5000 nm. The proportion of the filler in the composition is preferably in the range of 0.1 to 300 parts by weight, more preferably in the range of 1 to 200 parts by weight with respect to 100 parts by weight of the total solid content of the components other than the filler. is there.

  In addition, the gas barrier composition of the present invention includes other known dehydrating agents such as methyl orthoformate, methyl orthoacetate, tetraethoxysilane, various surfactants, silane coupling agents, titanium couplings other than the above. Additives such as agents, dyes, dispersants, thickeners and leveling agents can also be blended.

  Thus, in the present invention, a gas barrier coating film can be formed by using the above-prepared gas barrier composition and applying the composition onto the inorganic oxide vapor deposition film. . In the present invention, the inorganic oxide vapor-deposited film and the gas barrier coating film form, for example, a chemical bond, a hydrogen bond, or a coordinate bond by hydrolysis / co-condensation reaction, and the like. And the gas barrier coating film can be improved, and the synergistic effect of the two layers can provide a better gas barrier effect. Examples of the method for applying the gas barrier composition of the present invention include one or more by coating means such as a roll coat such as a gravure coater, spray coat, spin coat, dipping, brush, bar code, applicator and the like. The gas barrier coating film of the present invention having a dry film thickness in the range of 0.01 to 30 μm, preferably in the range of 0.1 to 10 μm, can be formed by one-time coating. The condensation is carried out by heating and drying at a temperature in the range of ° C, preferably in the range of 70 to 200 ° C, in the range of 0.005 to 60 minutes, preferably in the range of 0.01 to 10 minutes. The gas barrier coating film of the invention can be formed. If necessary, when applying the gas barrier composition of the present invention, a primer agent or the like can be applied on the inorganic oxide vapor-deposited film in advance.

  Next, a desired printed pattern layer is formed between any layers forming the body member laminate 100 used for the body member 1 constituting the paper cup according to the present invention and the bottom member laminate 200 used for the bottom member 2. It is something that can be done. As the printed pattern layer, for example, on the surface of the outermost layer 103, 203 or the paper base material layer 101, 201, a normal gravure ink composition, offset ink composition, letterpress ink composition, screen ink composition, etc. For example, a gravure printing method, an offset printing method, a relief printing method, a silk screen printing method, and other printing methods are used, for example, characters, figures, pictures, symbols, etc. It can be configured by forming a printed pattern. Regarding the ink composition, examples of the vehicle constituting the ink composition include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly (meth) acrylic resins, polyvinyl chloride resins, and polyvinyl acetate. Resin, vinyl chloride-vinyl acetate copolymer, polystyrene resin, styrene-butadiene copolymer, vinylidene fluoride resin, polyvinyl alcohol resin, polyvinyl acetal resin, polyvinyl butyral resin, polybutadiene resin, polyester resin Resins, polyamide resins, alkyd resins, epoxy resins, unsaturated polyester resins, thermosetting poly (meth) acrylic resins, melamine resins, urea resins, polyurethane resins, phenol resins, xylene resins , Maleic resin, Fiber resins such as rocellulose, ethylcellulose, acetylbutylcellulose, ethyloxyethylcellulose, rubber resins such as chlorinated rubber and cyclized rubber, natural resins such as petroleum resins, rosin and casein, linseed oil, soybean oil, etc. A mixture of one or more of fats and oils and other resins can be used. In the present invention, one or more of the above-mentioned vehicles are used as a main component, and one or more of coloring agents such as dyes and pigments are added to this, and if necessary, a filler, Light stabilizers such as additives, plasticizers, antioxidants, UV absorbers, dispersants, thickeners, drying agents, lubricants, antistatic agents, cross-linking agents, and other additives are optionally added, solvent, dilution Ink compositions having various forms obtained by sufficiently kneading with an agent or the like can be used.

  In the present invention, a method for producing a laminate for a trunk member and a laminate for a bottom member using the above materials will be described. As such a method, for example, a method of laminating a normal packaging material, for example, A wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, a T-die extrusion molding method, a coextrusion lamination method, an inflation method, a coextrusion inflation method, and the like can be used. Thus, in the present invention, when performing the above lamination, if necessary, pretreatment such as corona treatment, plasma treatment, ozone treatment, etc. can be optionally performed. Anchor coating agents such as polyurethane (polyurethane), polyethyleneimine, polybutadiene, and organic titanium, or laminates such as polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, and others Known anchor coat agents such as adhesives, adhesives for laminating, and the like can be arbitrarily used.

In the present invention, the method for producing the laminate for body member and the laminate for bottom member according to the present invention will be specifically described. For example, dry lamination is performed by laminating an adhesive layer for laminating with an adhesive for laminating. Or an extrusion lamination method in which layers are laminated via a melt-extruded resin layer made of a melt-extruded adhesive resin. In the above, as the laminating adhesive, for example, one-part or two-part curable or non-cured vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, etc. It is possible to use an adhesive for laminating such as a solvent type such as rubber, others, an aqueous type, or an emulsion type. As a coating method of the laminating adhesive, for example, direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, fountain method, transfer roll coating method, and other methods can be used. The coating amount is preferably in the range of 0.1 to 10 g / m ² (dry state), more preferably in the range of 1 to 5 g / m ² (dry state). For example, an adhesion promoter such as a silane coupling agent can be arbitrarily added to the laminating adhesive.

In the above, as the melt-extrusion adhesive resin, the heat-sealable resin that forms the heat-sealable resin layer described above can be used in the same manner, and low-density polyethylene, particularly linear low-density polyethylene, acid-modified It is preferred to use polyethylene. The film thickness of the melt-extruded resin layer by the above-described melt-extruded adhesive resin is preferably in the range of 5 to 100 μm, more preferably in the range of 10 to 50 μm. In the present invention, when the above lamination is performed, if it is necessary to obtain a stronger adhesive strength, an adhesion improving agent such as an anchor coating agent can be coated. Examples of the anchor coating agent include organic titanium anchor coating agents such as alkyl titanates, isocyanate anchor coating agents, polyethyleneimine anchor coating agents, polybutadiene anchor coating agents, and other various aqueous or oil-based anchor coating agents. 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 in the range of 0.1 to 5 g / m ² (dry state).

  Next, as the paper cup according to the present invention, for example, the shape of the paper cup may be any of a square shape such as a triangle, a quadrangle, a pentagon, a hexagon, and the like, or a cylindrical paper can such as a round shape. Can be manufactured. Furthermore, in the present invention, the paper cup according to the present invention is filled and packaged with various articles such as various foods and drinks, chemicals such as adhesives and pressure-sensitive adhesives, miscellaneous goods such as cosmetics and pharmaceuticals, and others. It is something that can be done. Thus, in the present invention, the liquid paper container according to the present invention is particularly suitable for liquid seasonings such as juices, mineral water, soy sauce, sauces, soups, etc. It is useful as a packaging container for filling and packaging various liquid foods and drinks such as food, curry, stew, soup, etc.

  The present invention will be described more specifically with reference to examples.

  (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm is used, and this is attached to a feeding roll of a plasma chemical vapor deposition apparatus. Then, on the corona-treated surface of the above biaxially stretched polyethylene terephthalate film under the following conditions: Then, a vapor-deposited film of silicon oxide having a thickness of 200 mm was formed. (Deposition conditions) Deposition surface; corona-treated surface Introduction gas amount; hexamethyldisiloxane: oxygen gas: helium = 1.0: 3.0: 3.0 (unit: slm) Degree of vacuum in the vacuum chamber: 2-6 × 10-6 mBar Degree of vacuum in the vapor deposition chamber; 2-5 × 10-3 mBar Cooling / electrode drum power supply; 10 kW Line speed: 100 m / min Next, immediately after forming a 200-nm thick silicon oxide vapor deposition film as described above In addition, a glow discharge plasma generator is used on the surface of the silicon oxide vapor deposition film, and the power is 9 kw, oxygen gas (O2): argon gas (Ar) = 7.0: 2.5 (unit: slm) Gas is used, oxygen / argon mixed gas plasma treatment is performed at a mixed gas pressure of 6 × 10 −5 Torr and a treatment speed of 420 m / min, and the surface tension of the deposited silicon oxide film surface is 54 dyne / cm. An improved plasma treated surface was formed.

(2). On the other hand, 100 parts of tetra-i-propoxytitanium and 70 parts of acetylacetone were added to a reactor equipped with a reflux condenser and a stirrer, and stirred at 60 ° C. for 30 minutes to obtain a titanium chelate compound. The purity of this reaction product was 75%. Next, as component (A), an ethylene-vinyl alcohol copolymer (manufactured by Nippon Synthetic Chemical Co., Ltd., trade name, Soarnol D2935, degree of saponification; 98% or more, ethylene content; 29 mol%, melt flow index; 35 g / 10 minutes) of 5% water / n-propyl alcohol solution (water / n-propyl alcohol weight ratio = 40/60), 2 parts of the titanium chelate compound prepared above and 16.8 parts of n-propyl alcohol. , And 11.2 parts of water, and the component (B) hydrolyzed at 55 ° C. for 4 hours were mixed at 40 ° C. and stirred for 2 hours to obtain a gas barrier composition of the present invention. Next, the gas barrier composition produced above is used for the plasma treatment surface formed in the above (1), and this is coated by a gravure roll coating method, and then heat-treated at 120 ° C. for 2 minutes. A gas barrier coating film having a thickness of 0.5 g / m ² (dry state) was formed to produce a barrier layer.

(3). Next, the one side of the cup base paper having a basis weight of 270 g / m ² is opposed to the gas barrier coating film surface constituting the barrier layer produced in the above (2), and while performing inline corona treatment or ozone treatment, Between the layers, an ethylene-methacrylic acid copolymer (manufactured by Mitsui DuPont Polychemical Co., Ltd., trade name, Nucrel N0908C, extrusion temperature: 290 ° C., extrusion film thickness 20 μm) was used, and this was extrusion laminated. The cup base paper and the barrier layer were bonded together. Furthermore, on the surface of a 12 μm-thick biaxially stretched polyethylene terephthalate film constituting the barrier layer bonded to the cup base paper, a two-component curable ester anchor coating agent (Takeda Pharmaceutical Co., Ltd., trade name, Takelac A3210 / Takenate A3075, coating amount: 1 g / m ² (dry state) was applied with a gravure coater, passed through a drying furnace, and then the surface of the anchor coating agent layer was coated with a low density polyethylene resin (density: 0). 923, melt index (M.I); 3.7), and this was extrusion coated to form a low-density polyethylene resin layer having a thickness of 20 μm.

  In addition, after the corona treatment discharge treatment was performed on the other surface of the cup base paper bonded to the barrier layer as described above, a low density polyethylene resin (density: 0.923, melt index (M. I); 3.7), and this was extrusion coated to form a low-density polyethylene resin layer having a thickness of 20 μm. Next, a low-density polyethylene resin (on the surface of a low-density polyethylene resin layer having a thickness of 20 μm, which is extrusion-coated on the surface of a 12 μm-thick biaxially stretched polyethylene terephthalate film constituting the barrier layer bonded to the base paper of the cup, is used. Density: 0.923, melt index (M.I); 3.7) and an ethylene-α-olefin copolymer resin polymerized using a metallocene catalyst (density: 0.907, melt index (M.I); 11.0), and coextruding these, and comprising a two-layer coextruded laminated resin layer of a low-density polyethylene resin layer and an ethylene-α / olefin copolymer resin layer polymerized using a metallocene catalyst, And the film thickness of the low density polyethylene resin layer is 15 μm, and the ethylene-α / olefin copolymer resin layer polymerized using a metallocene catalyst The thickness and 20 [mu] m, to form an innermost layer composed of a total of 55 .mu.m, to produce a bottom member laminate for use in the bottom member of the present invention.

  On the other hand, instead of the coextruded resin layer of the low density polyethylene resin and the ethylene-α / olefin copolymer resin, a low density polyethylene resin (density: 0.923, melt index (MI): 3.7) is used. This was extruded and coated to form a low-density polyethylene resin layer having a thickness of 40 μm, and a body member laminate used for the body member according to the present invention was manufactured.

  (4). Next, using the body member laminate produced above, a frustoconical body member blank for making a paper cup body member was produced by punching, and end face processing such as skive hemming was performed. Next, the body member blank is rolled into a cylindrical shape, and both end portions thereof are partially overlapped, and heat treatment such as flame treatment or hot air treatment is performed on the superposed portion, and the superposed portion is present. The cylindrical body forming the paper cup is formed by heating and melting the low density polyethylene resin 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. A member was manufactured. On the other hand, similarly to the above, the bottom member laminate manufactured above is used, and this is punched into a circular shape to manufacture a bottom member blank constituting the bottom member, and then the outer periphery of the bottom member blank A bottom member having a bent portion was manufactured by erecting the portion into a cylindrical shape. Next, the bottom member manufactured in the same manner is inserted into the cylindrical body member manufactured as described above, and thereafter, the cylindrical body member and the bottom member are blown with hot air or the like on the joint portion. The low-density polyethylene resin layer that constitutes the outer layer and the innermost layer is heated and melted, and then the lower end portion of the cylindrical body member is bent inward by a curling die, and the bent portion constituting the bottom member is covered. The cylindrical body member and the bottom member are bonded to each other by knurling the overlapping portion between the lower end portion of the cylindrical body member and the bent portion of the bottom member from the inner diameter side by a knurl. The paper cup bottom part which consists of said cylindrical trunk | drum member and a bottom member was formed. After that, the upper end portion on the side opposite to the side where the cylindrical body member and the bottom member are closely bonded to each other to form the joint portion is curled while being bent outward by the curling die in the same manner as described above, and the top portion is formed. A curled portion was formed to produce a paper cup with a capacity of 180 cc according to the present invention.

  (1). A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm is used as a base film. First, the above-mentioned biaxially stretched polyethylene terephthalate film is mounted on a delivery roll of a take-up vacuum deposition apparatus, and then this is fed out. The film thickness of the biaxially stretched polyethylene terephthalate film was adjusted according to the following deposition conditions by vacuum deposition using an electron beam (EB) heating method while supplying oxygen gas using aluminum as a deposition source. A 200-mm aluminum oxide vapor deposition film was formed. (Deposition conditions) Degree of vacuum in the deposition chamber: 2 × 10 −4 mbar Degree of vacuum in the take-up chamber; 2 × 10 −2 mbar, electron beam power; 25 kW Film transport speed; 240 m / min, Deposition surface: Corona treatment surface Next, immediately after the above-described aluminum oxide vapor deposition film having a thickness of 200 mm was formed, a plasma-treated surface was formed on the aluminum oxide vapor deposition film surface in the same manner as in Example 1 above.

(2). On the other hand, 100 parts of tetra-i-propoxytitanium and 70 parts of acetylacetone were added to a reactor equipped with a reflux condenser and a stirrer, and stirred at 60 ° C. for 30 minutes to obtain a titanium chelate compound. The purity of this reaction product was 75%. Next, as component (A), an ethylene-vinyl alcohol copolymer (manufactured by Nippon Synthetic Chemical Co., Ltd., trade name, Soarnol D2935, degree of saponification; 98% or more, ethylene content; 29 mol%, melt flow index; 35 g / 10 minutes) of 5% water / n-propyl alcohol solution (water / n-propyl alcohol = 40/60 (weight ratio)), 2 parts of the titanium chelate compound prepared above and n-propyl alcohol. 8 parts and 11.2 parts of water were mixed, and the component (B) hydrolyzed at 55 ° C. for 4 hours was mixed at 40 ° C. and stirred for 2 hours to obtain the gas barrier composition of the present invention. . Next, the plasma-treated surface formed in the above (1) is coated with the gas barrier composition produced above by the gravure roll coating method, and then heat-treated at 120 ° C. for 2 minutes. Then, a gas barrier coating film having a thickness of 0.51 g / m ² (dry state) was formed to produce a barrier layer.

(3). Next, using the barrier layer produced above, in the same manner as in Example 1 above, a cup base paper having a basis weight of 270 g / m ² and the barrier layer were mixed with an ethylene-methacrylic acid copolymer (Mitsui DuPont). Polychemical Co., Ltd., trade name, Nucrel N0908C, extrusion temperature: 290 ° C., extrusion film thickness: 20 μm) was used, and this was extrusion laminated to bond the cup base paper and the barrier layer together. Furthermore, on the surface of a 12 μm-thick biaxially stretched polyethylene terephthalate film constituting the barrier layer bonded to the cup base paper, a two-component curable ester anchor coating agent (Takeda Pharmaceutical Co., Ltd., trade name, Takelac A3210 / Takenate A3075, coating amount: 11 g / m ² (dried state) was applied with a gravure coater, passed through a drying furnace, and then the surface of the anchor coating agent layer was coated with a low density polyethylene resin (density: 0). 923, melt index (M.I); 3.7), and this was extrusion coated to form a low-density polyethylene resin layer having a thickness of 20 μm. In addition, after the corona treatment discharge treatment was performed on the other surface of the cup base paper bonded to the barrier layer as described above, a low density polyethylene resin (density: 0.923, melt index (M. I); 3.7), and this was extrusion coated to form a low-density polyethylene resin layer having a thickness of 20 μm. Next, a low-density polyethylene resin (on the surface of a low-density polyethylene resin layer having a thickness of 20 μm, which is extrusion-coated on the surface of a 12 μm-thick biaxially stretched polyethylene terephthalate film constituting the barrier layer bonded to the base paper of the cup, is used. Density: 0.923, melt index (M.I); 3.7) and an ethylene-α-olefin copolymer resin polymerized using a metallocene catalyst (density: 0.907, melt index (M.I); 11.0), and coextruding these, and comprising a two-layer coextruded laminated resin layer of a low-density polyethylene resin layer and an ethylene-α / olefin copolymer resin layer polymerized using a metallocene catalyst, And the film thickness of the low density polyethylene resin layer is 15 μm, and the ethylene-α / olefin copolymer resin layer polymerized using a metallocene catalyst The thickness and 20 [mu] m, to form an innermost layer composed of a total of 55 .mu.m, to produce a bottom member laminate for use in the bottom member of the present invention.

  On the other hand, instead of the coextruded resin layer of the low density polyethylene resin and the ethylene-α / olefin copolymer resin, a low density polyethylene resin (density, 0.923; melt index (MI); 3.7) is used. This was extruded and coated to form a low-density polyethylene resin layer having a thickness of 40 μm, and a body member laminate used for the body member according to the present invention was manufactured.

  (4). Next, a paper cup having a capacity of 180 cc according to the present invention was produced in the same manner as in Example 1 above, using the laminate for body member and the laminate for bottom member produced above.

While subjecting the surface of a cup base paper having a basis weight of 270 g / m ² to corona treatment, low density polyethylene (density: 0.923, melt index (MI): 3.7) was extruded and laminated at a thickness of 20 μm, An ethylene-α / olefin copolymer resin (density: 0.91, melt index (MI): 15.0) polymerized using a metallocene catalyst while corona treatment is applied to the back side of the base paper is extruded and laminated at a thickness of 25 μm. The laminated body for the bottom member of the paper cup concerning this invention was manufactured.
On the other hand, a laminate for a body member using low-density polyethylene (density: 0.923, melt index (MI): 3.7) instead of the ethylene-α / olefin copolymer resin polymerized using a metallocene catalyst. Manufactured.

  (4). Next, a paper cup having a capacity of 180 cc according to the present invention was produced in the same manner as in Example 1 above, using the laminate for body member and the laminate for bottom member produced above.

<Comparative Example 1>
In Example 1 described above, all of them were prepared in the same manner except that the bottom member laminate produced in Example 1 was also used for the body member. That is, in the paper cup, the innermost layer uses a laminate of an ethylene-α / olefin copolymer polymerized using a metallocene catalyst for both the body member and the bottom member.

<Comparative example 2>
In Example 1 described above, all were produced in the same manner except that the body member laminate produced in Example 1 was also used for the bottom member. That is, the innermost layer is a paper cup using a laminate of low density polyethylene resin for both the body member and the bottom member.

<Comparative Example 3>
In Example 2 described above, all were produced in the same manner except that the bottom member laminate produced in Example 2 was also used for the body member. That is, in the paper cup, the innermost layer uses a laminate of an ethylene-α / olefin copolymer polymerized using a metallocene catalyst for both the body member and the bottom member.

<Comparative example 4>
In Example 2 described above, all were produced in the same manner except that the body member laminate produced in Example 2 was also used for the bottom member. That is, the innermost layer is a paper cup using a laminate of low density polyethylene resin for both the body member and the bottom member.

<Comparative Example 5>
In Example 3 described above, all were produced in the same manner except that the body member laminate produced in Example 3 was also used for the bottom member. That is, the innermost layer is a paper cup using a laminate of low density polyethylene resin for both the body member and the bottom member.

<Test results>
As a result of evaluating the paper cup moldability and sealability of the paper cups manufactured in Examples 1 to 3 and Comparative Examples 1 to 5, as shown in Table 1 below, the innermost layer of the trunk member and the bottom member In the comparative example using the metallocene resin, the sealing property was improved, but the slippage of the body member blank and the occurrence of buckling and wrinkles due to the decrease in the rigidity of the container due to heating were observed. On the other hand, in the cup using low density polyethylene for the innermost layer of the body member and the bottom member, no problem was observed in paper cup moldability and the like, but poor sealing and liquid leakage were recognized.
On the other hand, in Examples 1 to 3 of the paper cup according to the present invention, by using low-density polyethylene for the body member, there is no processing defect in the body member blank punching machine, and slipping during the paper cup molding is performed. Defects, buckling, wrinkles, etc. were not recognized, and no seal failure, liquid leakage, etc. were found by using a metallocene resin for the bottom member.

  As a specific example, the paper cup container of the present invention uses a bottom member in which an ethylene-α / olefin copolymer resin mainly composed of at least a paper layer and polymerized using a metallocene catalyst is laminated on the innermost layer. In addition, it is possible to manufacture a paper cup that has good moldability, avoids sealing failure and liquid leakage due to occurrence of omission of seals and pinholes, and is excellent in storage stability of contents. Etc.

1 is a partially cutaway front view of a paper cup according to the present invention. It is a schematic sectional drawing which shows the basic layer structure of the laminated material which comprises the paper cup concerning this invention. It is a schematic sectional drawing which shows an example of the laminated constitution of the laminated material which comprises the paper cup concerning this invention. It is a schematic sectional drawing which shows the other example of the laminated constitution of the laminated material which comprises the paper cup concerning this invention. It is a schematic block diagram which shows the structure of the paper cup in the paper cup shaping | molding process about the paper cup concerning this invention using said laminated body. It is a schematic block diagram which shows the structure of the paper cup in the paper cup shaping | molding process about the paper cup concerning this invention using said laminated body. It is a schematic block diagram which shows the structure of the paper cup in the paper cup shaping | molding process about the paper cup concerning this invention using said laminated body. It is a schematic block diagram which shows the structure of the paper cup in the paper cup shaping | molding process about the paper cup concerning this invention using said laminated body. It is a schematic block diagram which shows the structure of the paper cup in the paper cup shaping | molding process about the paper cup concerning this invention using said laminated body.

Explanation of symbols

A Paper Cup of the Present Invention 1 Body member 2 Bottom member 3 Joining portion 10 Body member blank 11 Body pasting portion 12 Lower end portion 13 Upper end portion 14 Top curl portion 20 Bottom member blank 21 Bending portion 100 Body member laminate 101 Paper base material layer 102 innermost layer 103 outermost layer 104 barrier layer 200 laminate 201 for bottom member paper base material layer 202 innermost layer 203 outermost layer 204 barrier layer P hot air device Q curl type R knurl

Claims (9)

In a paper cup comprising a barrel member using a laminate for a trunk member consisting of at least a paper base layer and an innermost layer and a bottom member using a laminate for a bottom member consisting of at least a paper base layer and an innermost layer, The innermost layer of the body member laminate to be used is a polyethylene resin layer, and the innermost layer of the bottom member laminate to be used for the bottom member is an ethylene-α-olefin copolymer polymerized using a single site catalyst. A paper cup comprising a resin layer. The innermost layer of the bottom member laminate is a co-extruded resin layer of low-density polyethylene and an ethylene-α-olefin copolymer polymerized using a single site catalyst, and the low-density polyethylene is disposed on the paper base layer side. 2. The paper cup according to claim 1, wherein the ethylene-α-olefin copolymer polymerized by using a single site catalyst is set to be the innermost side opposite. In the innermost layer coextruded, the thickness ratio (ethylene-α olefin copolymer resin layer polymerized using a single site catalyst / low density polyethylene resin layer) is in the range of 0.05 to 1.50. The paper cup according to claim 2. The paper cup according to claim 1, wherein the paper base material layer is made of paper of 100 to 500 g / m ² . The paper cup according to any one of claims 1 to 4, wherein a barrier layer is laminated between the paper base material layer and the innermost layer of the body member laminate and the bottom member laminate. The paper cup according to claim 5, wherein the barrier layer is made of a metal foil. 6. The paper cup according to claim 5, wherein the barrier layer is made of a resin layer of ethylene vinyl alcohol copolymer or polyamide resin. 6. The paper cup according to claim 5, wherein the barrier layer comprises a base film provided with an inorganic oxide vapor deposition film. The paper cup according to claim 5, wherein the barrier layer has a configuration in which a metal deposition film is provided on a base film.

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