Packaging material manufacturing method

Abstract

To provide a production method capable of producing a packaging material, without damaging heat seal ability, for producing a packaging material having high slip performance and residue prevention performance to an aqueous content.SOLUTION: There is provided a production method of a packaging material comprising: a step for preparing a laminate comprising a base material and a heat seal layer; a step for rolling the laminate into a cylindrical shape, so that the heat seal layer is inside, then overlapping both ends, then performing heat seal for generating a trunk part; a step for providing a head so as to be continuous to one end of the trunk part; and a step for applying from the other end of the trunk part, to an inner face, at least one of a surfactant and an oil based material whose HLB value is less than 16, for forming a slip layer. The base material has heat seal ability and the slip layer includes at least one of the surfactant and the oil based material whose HLB value is less than 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for producing packaging material. [Background technology]

[0002] In many product fields, such as food, beverages, pharmaceuticals, and chemicals, packaging materials have been developed to suit the respective contents. In particular, as packaging materials for viscous contents such as liquids, semi-solids, and gel-like substances, plastic materials that are excellent in water resistance, oil resistance, gas barrier properties, light weight, flexibility, and designability are used, and they function to protect the contents as required of packaging materials.

[0003] One of the functions of packaging materials is to prevent the contents from adhering to the inner surface of the packaging material, i.e., to have high slippage resistance and residue prevention performance so that the contents can be quickly discharged without remaining inside the packaging material. Contents that cannot be used up and remain inside the package are discarded together with the package, but disposal of such contents is considered problematic from an environmental perspective. This problem is particularly serious when the contents filled into the packaging material contain water.

[0004] For example, Patent Document 1 (JP 2005-306415 A) proposes a packaging material that is characterized by the type of resin used and its shape in order to prevent aqueous contents such as toothpaste from remaining inside the packaging material. However, since the ability of the contents to separate from the packaging is greatly affected by the resin properties of the innermost layer that comes into contact with the contents, it is difficult to achieve a sufficient effect of preventing contents from remaining by simply changing the shape of the packaging material, as proposed in Patent Document 1. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-306415 Summary of the Invention [Problem to be solved by the invention]

[0006] The present inventors have now discovered that by forming a sliding layer containing a specific material on the inner surface of a packaging material, the sliding properties and residue prevention performance of the packaging material can be significantly improved. Furthermore, the inventors have discovered a further problem that when a sliding layer is formed on a resin film (laminate) before the packaging material is formed, the heat sealing properties are reduced, making it difficult to produce the packaging material and reducing the strength of the packaging material produced.

[0007] Therefore, the problem to be solved by the present invention is to provide a method for producing a packaging material that has high slippage resistance and residue prevention performance for aqueous contents, and that can produce a packaging material without impairing heat sealability. [Means for solving the problem]

[0008] The method for producing a packaging material of the present invention includes the steps of: preparing a laminate including a substrate and a heat seal layer; a step of rolling the laminate into a tube with the heat seal layer facing inward, overlapping both ends, and heat sealing to form a body; providing a head portion so as to be continuous with one end of the body portion; and applying at least one of a surfactant having an HLB value of less than 16 and an oil-based material to the inner surface of the barrel from the other end to form a sliding layer, The substrate has heat sealability, The sliding layer is characterized by containing at least one of a surfactant having an HLB value of less than 16 and an oil-based material.

[0009] In one embodiment, the sliding layer is formed by a spray coating method.

[0010] In one embodiment, the sliding layer comprises a surfactant, and the surfactant is a nonionic surfactant.

[0011] In one embodiment, the nonionic surfactant is at least one surfactant selected from alkyl ether surfactants, alkylamino ether surfactants, fatty acid ether ester surfactants, vegetable oil ether ester surfactants, sorbitan fatty acid ester surfactants, fatty acid amide surfactants, and glycerin fatty acid ester surfactants.

[0012] In one embodiment, the sliding layer comprises an oil-based material, which is at least one oil-based material selected from vegetable oils, animal oils, and lubricating oils.

[0013] In one embodiment, the thickness of the sliding layer is 0.1 μm or more and 10 μm or less.

[0014] In one embodiment, the laminate of the present invention comprises a gas barrier layer between the substrate and the heat seal layer. [Effects of the Invention]

[0015] According to the present invention, a method for producing a packaging material that has high slip-off resistance and residue-preventing performance for aqueous contents can be provided, which can produce a packaging material without impairing heat-sealability. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing one embodiment of a packaging material produced by the production method of the present invention. [Figure 2] 2 is a cross-sectional view of the packaging material taken along line AA in FIG. 1. [Figure 3] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate. [Figure 4] FIG. 1 is a schematic cross-sectional view showing one embodiment of a laminate. [Figure 5] FIG. 10 is a schematic diagram for explaining a method for forming a sliding layer. DETAILED DESCRIPTION OF THE INVENTION

[0017] <Manufacturing method of packaging materials> The method for producing the packaging material of the present invention includes the steps of: providing a laminate comprising a substrate and a heat seal layer; a step of rolling the laminate into a tube with the heat seal layer facing inward, overlapping both ends, and heat sealing to form a body; providing a head portion so as to be continuous with one end of the body portion; and applying at least one of a surfactant and an oil-based material having an HLB value of less than 16 to the inner surface of the barrel from the other end to form a sliding layer. In one embodiment, the method for producing a packaging material of the present invention includes a step of heat-sealing the other end of the body to form a bottom.

[0018] <Packaging materials> The shape of the packaging material produced by the production method of the present invention is not particularly limited, but it can be, for example, a tube shape.

[0019] In one embodiment, the packaging material 10 comprises a head portion 11 , a body portion 12 , and a bottom portion 13 . In one embodiment, the head portion 11 of the packaging material 10 includes a shoulder portion 14 that is continuous with the head portion 11 and the body portion 12 . In one embodiment, the head 11 of the packaging material 10 includes a threaded portion 16 for screwing the cap 15 onto it. Furthermore, in one embodiment, the head portion 11 of the packaging material 10 includes a mouth portion 17 .

[0020] <Step of preparing laminate> As shown in FIG. 3, the laminate 20 includes a substrate 21 and a heat seal layer 22. In one embodiment, the laminate 20 includes an intermediate layer 23 between the substrate 21 and the heat seal 22, as shown in FIG. In one embodiment, the laminate 20 includes a gas barrier layer 24 between the substrate 21 and the heat seal layer 22, as shown in FIG. In one embodiment, the laminate 20 also includes an anchor coat layer 25 between any of the layers. Additionally, in one embodiment, laminate 20 includes adhesive layers 26 between any of the layers.

[0021] <Base material> The substrate constituting the laminate is characterized in that it has heat sealability and is made of a resin material. The resin material is not particularly limited as long as it is a resin that can be fused by heat, and for example, low-density polyethylene (LDPE, density 0.9 g / cm 3 ~0.93g / cm 3 ), linear low-density polyethylene (LLDPE, density 0.9g / cm 3 ~0.93g / cm 3 ), medium density polyethylene (MDPE, density 0.931g / cm 3 ~0.941g / cm 3 ), high density polyethylene (HDPE, density 0.942g / cm 3Examples of suitable resins include ethylene-α-olefin copolymer resins polymerized using a metallocene catalyst, ethylene-polypropylene random or block copolymer resins, polypropylene, ethylene-vinyl acetate copolymer (EVA) resin, ethylene-acrylic acid copolymer (EAA) resin, ethylene-ethyl acrylate copolymer (EEA) resin, ethylene-methacrylic acid copolymer (EMAA) resin, ethylene-methyl methacrylate copolymer (EMMA) resin, ionomer resins, heat-sealable ethylene-vinyl alcohol resins, copolymerized resins, polyolefins such as methylpentene resins, ethylene-propylene copolymers, methylpentene polymers, polybutene polymers, polyethylene, polypropylene, or cyclic olefin copolymers, acid-modified polyolefins obtained by modifying polyolefins with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, or itaconic acid, polyvinyl acetate, (meth)acrylic resins, and vinyl resins. These may be used alone or in combination. Among these, LDPE and LLDPE are preferred from the standpoint of heat-sealability. When polyethylene is used, biomass-derived polyethylene resin may be used instead of fossil fuel-derived polyethylene resin, from the viewpoint of reducing the environmental load. The substrate may have a multi-layer structure, for example, including an intermediate layer made of a polyester resin, which can improve the strength of the substrate.

[0022] Various additives may be added to the substrate as long as the properties of the substrate are not impaired. Examples of additives include plasticizers, UV stabilizers, color inhibitors, matting agents, deodorizers, flame retardants, weather resistance agents, antistatic agents, thread friction reducers, slip agents, mold release agents, antioxidants, ion exchange agents, and color pigments.

[0023] In the present invention, the substrate may be a single-layer or multi-layer film formed by a film-forming method such as extrusion, cast molding, T-die method, cutting method, or inflation method.

[0024] In order to improve adhesion to a resin film or the like, the surface of the substrate is preferably subjected to a surface activation treatment such as corona treatment, flame treatment, plasma treatment, or flame treatment.

[0025] The substrate may have an image formed on its surface. The image to be formed is not particularly limited, and may include letters, patterns, symbols, and combinations thereof. The ink that can be used for forming an image on a substrate is not particularly limited, and any conventionally known ink can be used. From the viewpoint of reducing the environmental load, biomass-derived ink is preferred. The method for forming the image is not particularly limited, and examples thereof include conventionally known printing methods such as gravure printing, offset printing, flexographic printing, etc. Among these, flexographic printing is preferred from the viewpoint of environmental load.

[0026] The thickness of the substrate can be determined appropriately by those skilled in the art depending on the packaging application, but is preferably 6 μm or more and 200 μm or less, and more preferably 15 μm or more and 150 μm or less.

[0027] <Heat seal layer> The heat seal layer is made of a resin material, and the resin material can be appropriately selected and used from the same material as the base material.

[0028] The heat seal layer may contain various additives as long as the properties of the heat seal layer are not impaired, such as a plasticizer, an ultraviolet stabilizer, a color inhibitor, a matting agent, a deodorizer, a flame retardant, a weather resistance agent, an antistatic agent, a thread friction reducer, a slip agent, a mold release agent, an antioxidant, an ion exchange agent, and a color pigment.

[0029] The thickness of the heat seal film can be determined appropriately by those skilled in the art depending on the packaging application, but is preferably 6 μm or more and 200 μm or less, and more preferably 30 μm or more and 150 μm or less.

[0030] In the present invention, the heat seal layer may be a single layer or a multilayer film formed by a film forming method such as extrusion, cast molding, T-die method, cutting method, or inflation method.

[0031] <Middle class> In one embodiment, the laminate includes an intermediate layer between the substrate and the heat seal layer, which can improve the mechanical strength of the laminate. The intermediate layer is made of a resin material, and examples of the resin material include polyolefins such as LDPE, LLDPE, MDPE, HDPE, and polypropylene; vinyl resins such as polyvinyl chloride, polyvinyl alcohol (PVA), polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, and polyvinylpyrrolidone (PVP); cellulose resins such as cellulose acetate, nitrocellulose, cellulose acetate propionate (CAP), and cellulose acetate butyrate (CAB); (meth)acrylic resins such as polyacrylate, polymethacrylate, and polymethyl methacrylate.

[0032] The intermediate layer may contain various additives within the range that does not impair its properties, such as a plasticizer, an ultraviolet stabilizer, a color inhibitor, a matting agent, a deodorizer, a flame retardant, a weather resistance agent, an antistatic agent, a thread friction reducer, a slip agent, a mold release agent, an antioxidant, an ion exchange agent, and a color pigment.

[0033] A stretched resin film can be used as the intermediate layer, which can improve the mechanical strength of the laminate. The stretching may be uniaxial or biaxial.

[0034] The thickness of the intermediate layer is preferably 1 μm or more and 70 μm or less, and more preferably 3 μm or more and 50 μm or less. By setting the thickness of the sliding layer within the above numerical range, sliding performance and anti-remaining performance can be further improved.

[0035] <Gas barrier layer> In one embodiment, the laminate may include a gas barrier layer between the substrate and the heat seal layer. By including a gas barrier layer in the laminate, the resulting packaging material can be provided with or improved gas barrier properties that prevent the permeation of oxygen gas, water vapor, and the like. The laminate may include two or more gas barrier layers. When two or more gas barrier layers are included, they may have the same composition or different compositions.

[0036] In one embodiment, the gas barrier layer is composed of a gas barrier film made of a gas barrier resin such as ethylene-vinyl alcohol copolymer (EVOH), polyvinyl alcohol, polyacrylonitrile, polyamide such as nylon 6, nylon 6,6, and polymetaxylylene adipamide (MXD6), polyester, polyurethane, or (meth)acrylic resin. The gas barrier layer may contain the above-mentioned additives. The resin film is preferably a stretched film, which can improve the mechanical strength of the laminate. The stretching may be uniaxial or biaxial. The thickness of such a gas barrier layer is preferably 1 μm or more and 70 μm or less, and more preferably 3 μm or more and 50 μm or less. By setting the thickness of the gas barrier layer within the above numerical range, the gas barrier properties can be further improved while maintaining the processability of the laminate.

[0037] In one embodiment, the gas barrier layer is composed of a film having a vapor-deposited film on one side and composed of a resin material such as polyester (e.g., polyethylene terephthalate), polyolefin, cellulose resin, or (meth)acrylic resin. Among these, polyester, particularly polyethylene terephthalate, is preferred from the viewpoint of improving the mechanical strength of the laminate. The resin film is preferably a stretched film, which can improve the mechanical strength of the laminate. The stretching may be uniaxial or biaxial. The resin film may contain the above-mentioned additives. Examples of the vapor-deposited film include vapor-deposited films composed of metals such as aluminum, magnesium, tin, sodium, titanium, zirconium, lead, yttrium, gold, and chromium, and inorganic oxides such as aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, zirconium oxide, titanium oxide, boron oxide, hafnium oxide, and barium oxide. The thickness of the vapor-deposited film is preferably 1 nm or more and 150 nm or less, more preferably 5 nm or more and 60 nm or less, and even more preferably 10 nm or more and 40 nm or less. By making the thickness of the vapor-deposited film 1 nm or more, the oxygen barrier property and water vapor barrier property of the laminate can be further improved, and by making the thickness of the vapor-deposited film 150 nm or less, the occurrence of cracks in the vapor-deposited film can be prevented. Examples of methods for forming a vapor deposition layer include physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) methods such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition.

[0038] <Adhesive layer> The present invention may include an adhesive layer between any of the layers. In one embodiment, the adhesive layer is made of an adhesive, and examples of the adhesive include thermosetting, ultraviolet-curing, and electron beam-curing adhesives. Examples of the adhesive include polyvinyl acetate adhesives such as polyvinyl acetate and vinyl acetate-ethylene copolymers, polyacrylic acid adhesives made of copolymers of polyacrylic acid with polystyrene, polyester, polyvinyl acetate, and the like, cyanoacrylate adhesives, ethylene copolymer adhesives made of copolymers of ethylene with monomers such as vinyl acetate, ethyl acrylate, acrylic acid, and methacrylic acid, cellulose adhesives, polyurethane adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, polyolefin adhesives, amino resin adhesives made of urea resin, melamine resin, and the like, phenolic resin adhesives, epoxy adhesives, reactive (meth)acrylic adhesives, elastomer adhesives made of chloroprene rubber, nitrile rubber, styrene-butadiene rubber, and the like, silicone adhesives, and inorganic adhesives made of alkali metal silicates, low-melting-point glass, and the like. The adhesive may be in any form, such as an aqueous type, a solution type, an emulsion type, or a dispersion type, and may be in any form, such as a film / sheet, a powder, or a solid, and the adhesive mechanism may be any form, such as a chemical reaction type, a solvent evaporation type, a thermal melting type, or a thermal pressure type.

[0039] In one embodiment, the adhesive layer is an extruded resin layer formed by extruding a heated and melted thermoplastic resin, such as LDPE or LLDPE.

[0040] <Anchor coat layer> The laminate of the present invention may have an anchor coat layer, which can improve adhesion between adjacent layers. The anchor coat layer can be formed using an anchor coat agent, and examples thereof include organic titanium-based, isocyanate-based, polyethyleneimine-based, acid-modified polyethylene-based, and polybutadiene-based anchor coat agents.

[0041] The thickness of the anchor coat layer is preferably 0.05 μm or more and 2 μm or less, and more preferably 0.1 μm or more and 1 μm or less. By setting the thickness of the anchor coat layer within the above numerical range, the adhesion between adjacent layers can be further improved.

[0042] <Process for making the body> The body of the packaging material can be formed by rolling the laminate into a tube with the heat-sealable layer on the inside, overlapping both ends, and heat-sealing the overlapped portion (see Figure 2). Examples of heat sealing methods include known methods such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high frequency sealing, and ultrasonic sealing. The heat sealing temperature is not particularly limited, but can be, for example, 100°C or higher and 250°C or lower.

[0043] <Step of providing the head> The method for producing a packaging material of the present invention includes a step of providing a head portion so as to be continuous with one end of the body portion. The head portion can be provided by utilizing a compression molding method or an injection molding method.

[0044] In one embodiment, the head portion of the packaging material can be formed by attaching the body portion to a mandrel for molding a tube container, and then compression molding or injection molding a resin material onto one end of the body portion in a mold. However, this is not limitative, and a pre-molded head portion may also be welded to the body portion. Examples of resin materials that can be used to form the head include LDPE, LLDPE, MDPE, HEDPE, polypropylene, vinyl resin, and (meth)acrylic resin.

[0045] The head may be composed of a mixture of a resin material and various additives, as long as the properties of the head are not impaired. Examples of the additives include plasticizers, UV stabilizers, color inhibitors, matting agents, deodorizers, flame retardants, weather resistance agents, antistatic agents, thread friction reducers, slip agents, mold release agents, antioxidants, ion exchange agents, and color pigments.

[0046] <Process for forming the sliding layer> In the method for producing a packaging material of the present invention, the sliding layer is formed after the body and head are produced by applying at least one of a surfactant and an oil-based material having an HLB value of less than 16 to the inner surface of the body from the end opposite the end where the head is provided. By forming the sliding layer in this manner, the packaging material can be produced without causing a decrease in the heat sealability of the heat seal layer when the body is produced. During the coating step, it is preferable that no sliding layer is formed at the position where the bottom of the packaging material is to be formed.

[0047] The application of at least one of a surfactant and an oil-based material having an HLB value of less than 16 can be carried out using a conventionally known method, but from the viewpoint of productivity and stable formation of a sliding layer, it is preferably carried out by a spray coating method.

[0048] Specifically, as shown in Figure 4, the sliding layer can be formed by holding the packaging material 10 with a holding part 30 so that the head is downward and the opening is upward, inserting an airbrush 31 through the opening, and using this to apply a surfactant or oil-based material. As the airbrush, for example, an automatic one-handed gun WA-0609 manufactured by Anest Iwata or a spray gun for inner surface coating (capable of 360° coating) can be used.

[0049] The sliding layer contains at least one of a surfactant and an oil-based material having an HLB value of less than 16, and the content of these in the sliding layer is preferably 40% by mass or more, more preferably 50% by mass or more, and even more preferably 60% by mass or more.

[0050] From the viewpoint of slip-off performance and residue prevention performance, the HLB of the surfactant is preferably 14 or less, and more preferably 10 or less. The HLB of a surfactant can be calculated by the Griffin method (ie, HLB=20×sum of formula weights of hydrophilic moieties / molecular weight).

[0051] When the contents are food or toothpaste, the surfactant is preferably a nonionic surfactant from the viewpoint of safety. Examples of nonionic surfactants include alkyl ether surfactants, alkylamino ether surfactants, fatty acid ether ester surfactants, vegetable oil ether ester surfactants, sorbitan fatty acid ester surfactants, fatty acid amide surfactants, and glycerin fatty acid ester surfactants.

[0052] Examples of alkyl ether surfactants include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene myristyl ether, and polyoxyethylene octyldodecyl ether. Examples of alkylamino ether surfactants include (polyoxyethylene) lauryl amino ether lactate, stearyl amino ether lactate, di(polyoxyethylene) lauryl methyl amino ether dimethyl phosphate, di(polyoxyethylene) lauryl ethyl ammonium ethosulfate, and di(polyoxyethylene) lauryl methyl ammonium dimethyl phosphate. Examples of fatty acid ether ester surfactants include polyoxyethylene fatty acid ether esters. Examples of the vegetable oil ether ester surfactant include polyoxyethylene castor oil ether and polyoxyethylene hydrogenated castor oil ether. Examples of sorbitan fatty acid ester surfactants include polyoxyethylene sorbitan fatty acid esters. Examples of fatty acid amide surfactants include lauric acid diethanolamide, oleic acid diethanolamide, stearic acid diethanolamide, and comamide DEA. Examples of glycerin fatty acid ester surfactants include monoglycerin fatty acid esters, diglycerin fatty acid esters, and triglycerin fatty acid esters.

[0053] The sliding layer may contain an oil-based material, preferably a lubricating oil such as vegetable oil, animal oil, mineral oil, or synthetic oil. Examples of vegetable oils include rapeseed oil, tung oil, linseed oil, shortening, corn oil, soybean oil, sesame oil, sunflower oil, rice oil, camellia oil, coconut oil, palm oil, walnut oil, olive oil, almond oil, cocoa butter, shea butter, neem oil, safflower oil, Japan wax, candelilla wax, carnauba wax, castor oil, and salad oil. Examples of animal oils include lard, beef tallow, fish oil, horse oil, raniln, butter, squalane, and beeswax. Examples of mineral oils include silicone oil, naphtha, light oil, kerosene, heavy oil, paraffin, liquid paraffin, ceresin, and amber oil. Examples of synthetic oils include polybutene, alkylbenzene, alkylnaphthalene, and synthetic naphthalene oil.

[0054] The thickness of the sliding layer is preferably 0.1 μm or more and 10 μm or less, and more preferably 0.2 μm or more and 9 μm or less. By setting the thickness of the sliding layer within the above numerical range, the sliding performance and the performance of preventing residue can be further improved.

[0055] <Step of forming the bottom> The bottom of the packaging material can be formed by heat-sealing an opening at the end of the body opposite to the end where the head is provided, and then filling the contents through the opening and then heat-sealing the opening.

[0056] <Contents> The contents that are preferably filled into the packaging material of the present invention are water-based contents, such as toothpaste, ointment, whipped cream, bean paste, pickles, etc. The water content of the aqueous content is preferably 10% by mass or more and 80% by mass or less, and more preferably 15% by mass or more and 75% by mass or less. The moisture content of the contents can be measured using an infrared moisture meter (manufactured by Atex Co., Ltd., trade name: AD-4715). When the moisture content of the contents is within the above range, the packaging material according to the present invention can exhibit particularly good slip-off resistance and residue prevention performance.

[0057] The packaging material of the present invention can exhibit good slippage and residue prevention properties even for oil-based contents, as long as they are highly viscous and solid, such as bean paste, gochujang, chocolate paste, butter, margarine, cheese, mayonnaise, etc. [Example]

[0058] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0059] Example 1 LLDPE (manufactured by Prime Polymer Co., Ltd., product name: UZ-2021) was extruded by the inflation method (extrusion temperature: 180°C) to produce LLDPE films A and B with thicknesses of 80 μm, and LLDPE film C with a thickness of 100 μm.

[0060] A 12 μm thick PET film (Lumirror E5200, manufactured by Toray Advanced Film Co., Ltd.) was prepared. An anchor coating agent (product name: EL510 / CAT-RT80, manufactured by Toyo-Morton Co., Ltd., dilution solvent: ethyl acetate) was applied to both sides of this PET film to a thickness of 0.3 g / m2 after drying. 2 The coating was applied and dried to form an anchor coat layer.

[0061] On one side of the anchor coat layer formed as described above, LDPE (Nippon Polyethylene Co., Ltd., Novalec LC520) was melt-extruded to form a melt-extruded resin layer with a thickness of 25 μm, and LLDPE film A was laminated on top of this.

[0062] On the other side of the anchor coat layer formed as described above, LDPE (Nippon Polyethylene Co., Ltd., Novalec LC520) was melt-extruded to form a melt-extruded resin layer with a thickness of 25 μm, and LLDPE film C was laminated therebetween to obtain laminate A.

[0063] The above anchor coating agent was applied to one side of a 12 μm thick gas barrier film (VM-PET 1310, manufactured by Toray Advanced Film Co., Ltd.) to a thickness of 0.3 g / m2 after drying. 2 The coating was applied and dried so as to form an anchor coat layer, and LLDPE film B was laminated on the anchor coat layer to obtain laminate B.

[0064] The LLDPE film C of the laminate A and the gas barrier film of the laminate B were bonded together using a dry laminating adhesive (manufactured by Rock Paint Co., Ltd., Adlock RU004 / H1, coating amount 3.5 g / m 2 ) was interposed between the sheets to prepare a laminate of the present invention.

[0065] The laminate with a sheet width of 120 mm prepared as described above was overlapped with LLDPE film A and LLDPE film B at a width of 2 mm, and the laminate was heat-sealed at 250°C to obtain a body with a diameter of 38 mm and a height of 150 mm.

[0066] The cylindrical body portion produced as described above is attached to a mandrel for forming a tube container, In the mold, HDPE was compression molded at 230°C at one end of the body to form a shoulder and a mouth continuous with the body.

[0067] Next, using a one-handed automatic gun (WA-0609, manufactured by Anest Iwata), a coating liquid for forming a sliding layer, which was made by dissolving a surfactant (Poem OL-200V, manufactured by Riken Vitamin Co., Ltd., monodiglyceride (glycerin fatty acid ester surfactant), HLB = 3.2, gel-like) in ethanol to a concentration of 20% by mass, was applied to the inner surface from the other end of the body, and dried to form a sliding layer 5 μm thick, thereby obtaining a packaging material.

[0068] Example 2 A packaging material was produced in the same manner as in Example 1, except that the one-handed automatic gun was changed to a spray gun for inner surface application (manufactured by Anest Iwata, capable of 360° application).

[0069] Example 3 A packaging material was prepared in the same manner as in Example 1, except that surfactant A was changed to an oil-based material (Acter LO-1 (lubricant), liquid, manufactured by Riken Vitamin Co., Ltd.) and the one-handed automatic gun was changed to a spray gun for inner surface application (manufactured by Anest Iwata, capable of 360° application).

[0070] Comparative Example 1 A packaging material was prepared in the same manner as in Example 1, except that no sliding layer was formed.

[0071] Comparative Example 2 A laminate was produced in the same manner as in Example 1. Next, the coating liquid for forming the sliding layer used in Example 1 was applied to the surface of LLDPE film B included in the laminate, and dried to form a sliding layer having a thickness of 15 μm. The laminate with a sheet width of 120 mm prepared as described above was overlapped with LLDPE film A and LLDPE film B at a width of 2 mm, and an attempt was made to heat seal the laminate at 250°C, but heat sealing was not possible, and a body section could not be produced.

[0072] Comparative Example 3 A packaging material was prepared in the same manner as in Example 1, except that surfactant A was changed to surfactant E (manufactured by Takemoto Oil & Fat Co., Ltd., Paionin D-1715N, polyoxyethylene decyl ether (alkyl ether type), HLB=16.1).

[0073] <<Slip-off performance and residual prevention performance test>> The laminates obtained in the Examples and Comparative Examples were evaluated for slippage resistance and content residue prevention performance by the following methods. First, a tubular packaging material with an opening on one side obtained in the examples and comparative examples was prepared, and 30 g of a paste-like aqueous content A (manufactured by Lion Corporation, trade name: Systema Haguki Plus, viscosity: 525 Pa·s @0.46 (1 / s)) was filled near the opening, and the material was left to stand for 5 minutes with the opening facing upward. After leaving the container to stand, the state of adhesion of the contents to the inner surface of the packaging material was visually observed and evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1. In addition, paste-like water-based content B (manufactured by Lion Corporation, trade name: Clinica, viscosity 497 Pa·s @0.46 (1 / s)), paste-like water-based content C (manufactured by Kewpie Corporation, trade name: Banana Whip), and highly viscous oil-based content (manufactured by S&B Corporation, Doubanjiang) were also evaluated in the same manner, and the results are summarized in Table 1. In Comparative Example 2, a packaging material could not be produced, and therefore the evaluation was given as "-". (Evaluation criteria for slip-off performance) A: It had slid down to the bottom of the laminate. B: The laminate had slid down to the middle. C: The adhesive was held at the top of the laminate and did not slide down. (Evaluation criteria for preventing contents from remaining) A: Almost no residue was left on the laminate. B: Some residue was observed on the laminate. C: A large amount of residue was found on the laminate.

[0074] [Table 1] [Explanation of symbols]

[0075] 10: packaging material, 11: head, 12: body, 13: bottom, 14: shoulder, 15: cap, 16: screw portion, 17: mouth, 20: laminate, 21: substrate, 22: heat seal layer, 23: intermediate layer, 24: gas barrier layer, 25: anchor coat layer, 26: adhesive layer, 30: holding portion, 31: airbrush

Claims

1. preparing a laminate including a substrate, an intermediate layer, and a heat seal layer in this order; a step of rolling the laminate into a tube with the heat seal layer facing inward, overlapping both ends, and heat sealing to form a body; providing a head portion so as to be continuous with one end of the body portion; applying at least one of a surfactant and an oil-based material having an HLB value of less than 16 to the inner surface of the barrel from the other end to form a sliding layer; and heat-sealing the other end of the body to form a bottom. The substrate has heat sealability, The sliding layer contains at least one of a surfactant and an oil-based material having an HLB value of less than 16, the intermediate layer includes a polyester film and a polyolefin film, and is provided so that the polyester film is located on the substrate side; A method for manufacturing a packaging material, characterized in that the sliding layer is formed by a spray coating method, and no sliding layer is formed at the bottom formation position.

2. The sliding layer contains a surfactant, The method for producing a packaging material according to claim 1, wherein the surfactant is a nonionic surfactant.

3. 3. The method for producing a packaging material according to claim 2, wherein the nonionic surfactant is at least one surfactant selected from alkyl ether surfactants, alkylamino ether surfactants, fatty acid ether ester surfactants, vegetable oil ether ester surfactants, sorbitan fatty acid ester surfactants, fatty acid amide surfactants, and glycerin fatty acid ester surfactants.

4. the sliding layer comprises an oil-based material; The method for producing a packaging material according to claim 1, wherein the oil-based material is at least one oil-based material selected from vegetable oils, animal oils, and lubricating oils.

5. The method for producing a packaging material according to any one of claims 1 to 4, wherein the film thickness of the sliding layer is 0.1 µm or more and 10 µm or less.

6. The method for producing a packaging material according to any one of claims 1 to 5, wherein the laminate comprises a gas barrier layer between the substrate and the heat seal layer.

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