JP4631462B2 - Inner sealing material for sealing container mouth and container mouth sealing method using the same - Google Patents

Description

  The present invention relates to an inner seal material for sealing a container mouth and a method for sealing a container mouth using the same, and more specifically, a container mouth that is suitably used as a lid for glass bottle containers such as foods, pharmaceuticals, and cosmetics. The present invention relates to an inner seal material for part sealing and a container mouth sealing method using the same.

  Conventionally, an inner seal material has been provided at the mouth of a glass bottle or the like for storing powdered and granular contents such as instant coffee, powdered milk, and seasonings to protect the contents from quality deterioration due to moisture, oxidation, etc. in use. For example, as shown in FIG. 6, the inner seal material has an adhesive layer (13), a thermoplastic resin layer (12), and a sand resin layer (11) on an elastic base material layer (14) such as paperboard. Reseal layer (reseal layer) (20), thermal adhesive resin layer (1) on the back surface of metal thin film layer (2) such as aluminum foil, and release varnish layer (5) on the surface of the metal thin film layer (2) ), A laminate of a membrane layer (seal layer) (10) having a heat seal varnish layer (6), and when the cap is removed, the reseal layer (20) and the membrane layer (10) are separated from each other, The reseal layer (20) remains inside the cap, and the membrane layer (10) remains in the container mouth. When the cap is reattached to the container mouth, the reseal layer (20) Membrane layer (10) Bren layer is layered on also) if it is removed, moisture in the container interior with the cap, serve to prevent re-entry of such oxygen.

  In such an inner seal material, a thermoadhesive resin layer is laminated on the lowermost layer of the membrane layer having an aluminum foil layer, and the aluminum foil layer is heated by irradiating a high frequency to melt the thermoadhesive resin layer, thereby opening the container mouth. The thing of the structure adhered to a part is proposed (for example, refer patent document 1, 2).

Prior art documents are shown below.
JP 11-138680 A JP 2004-99053 A

  The membrane layer of the above-described high frequency seal type inner seal material uses an aluminum foil having a thickness of 10 μm or more, and hot melt bonding is performed via an intermediate layer such as a polyolefin resin layer or a paper layer on the inner surface side of the aluminum foil. An agent is formed, or a hot melt type heat-adhesive resin layer is directly formed on the inner surface of the aluminum foil. In addition, a sealant film is directly bonded to the inner surface of the aluminum foil, or a sealant layer is provided by applying heat sealability.

  Such an inner seal material heats the aluminum foil by high-frequency irradiation, and melts the lowermost sealant layer constituting the membrane layer to adhere to the container mouth of the glass bottle. Therefore, when performing high frequency sealing, the entire aluminum foil naturally generates heat. Therefore, the central part of the membrane layer not involved in the seal is also heated.

  In particular, in the case of a combination of a container mouth portion with poor adhesion and a membrane layer, in order to increase the temperature of the adhesion surface with the container mouth portion, the oscillation time of the high frequency seal oscillator is lengthened or the output is increased. Of course, the temperature of the central portion of the membrane layer that is not involved in the sealing is further increased.

  As described above, as a problem of the temperature rise in the central part of the membrane layer not involved in the seal, first, the low molecular weight resin and the easily volatile component of the lowermost sealant layer constituting the membrane layer are used as a fragrance. It will stick to the contents. In addition, in circular inner seal materials, the heat of the circumferential part necessary for sealing is usually in the central part because heat tends to be transferred from the circumferential part of the membrane layer to the central part during high-frequency oscillation. The energy efficiency is poor.

  The present invention is intended to solve such problems of the prior art, and heat generated from the metal thin film layer by high-frequency irradiation reduces the temperature of only the portion of the membrane layer involved in the container mouth and the seal. The low-molecular weight resin and easily volatile components of the sealant layer are not attached to the contents as a transfer scent, and in the case of a circular inner seal material, heat is transferred from the circumference to the center of the membrane layer. An object is to provide an inner seal material for sealing a container mouth portion that is energy efficient and a container mouth portion sealing method using the same.

  The present invention has been made to solve the above-described problems. The invention according to claim 1 of the present invention includes at least the elastic base layer (14) and the heat remaining inside the cap (C). Reseal layer (20) having a plastic resin layer (12) and at least a metal thin film layer (2) and a heat-adhesive resin layer (which are attached to the container mouth portion (h) of the container body (B) to form a lid. In the inner sealing material (A) for sealing the container mouth portion, which is peelably laminated with the membrane layer (10) having 1), the metal thin film layer (2) is placed on the thermoadhesive resin layer (1). An inner seal material for sealing a container mouth, which is formed in a pattern with substantially the same shape and width as the upper end surface (g) of the opening of the container mouth (h).

  The invention according to claim 2 of the present invention is the container mouth portion sealing inner seal material according to claim 1, wherein the metal thin film layer (2) is made of an aluminum foil or an aluminum deposited film. It is an inner seal material for sealing.

  According to a third aspect of the present invention, the container mouth portion sealing inner seal material (A) according to the first or second aspect is mounted on the inside of the cap (C), and the cap (C) is attached to the container body (B ), And the thermal adhesive resin layer (1) is melted by a high-frequency sealing method, and the inner sealing material (A) is attached to the upper end surface of the opening of the container mouth (h). The container mouth portion sealing method is characterized in that the container mouth portion (h) is sealed by bonding to (g).

  The inner seal material for sealing the container mouth of the present invention is attached to the reseal layer having at least the elastic base material layer and the thermoplastic resin layer, which is left inside the cap, and the container mouth of the container main body to be a lid material. An inner seal material for sealing a container mouth, in which at least a metal thin film layer and a membrane layer having a heat-adhesive resin layer are detachably laminated, wherein the metal thin-film layer is placed on the heat-adhesive resin layer. The part of the membrane layer where heat generated from the metal thin film layer is involved in the sealing of the container mouth and the membrane layer due to high-frequency irradiation due to being formed in a pattern with almost the same shape and the same size width as the upper end surface of the opening of the part Therefore, the low-molecular-weight resin and easily volatile components of the sealant layer do not adhere to the contents as a scent. Further, in the circular inner seal material, heat is not transmitted from the circumferential portion to the central portion of the membrane layer by heat conduction, and energy efficiency is improved.

  Embodiments of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a side sectional view showing an embodiment of the layer structure of an inner seal material (A) for sealing a container mouth according to the present invention, and FIG. 2 shows an inner seal material (A for sealing a container mouth according to the present invention). 3) is a side sectional view showing another embodiment of the layer structure of FIG. 3, and FIG. 3 is a plan view showing that the inner seal material (A) for sealing the container mouth according to the present invention is loaded into the cap (C). 4 is a side cross-sectional view showing a state where the cap is attached to the container mouth (h) and sealed, and FIG. 4 shows a state where the cap (C) is removed from the container body (B) from the state shown in FIG. C) is a side sectional view showing a state in which the reseal layer (20) remains in the container mouth portion (h) and the membrane layer (10) in the container mouth portion (h), and FIG. 5 shows the inner seal for sealing the container mouth portion according to the present invention. It is explanatory drawing explaining the formation process of the membrane layer (10) which comprises material (A).

  As shown in FIG. 1, the layer structure of the inner seal material (A) for sealing the container mouth of one embodiment of the present invention includes a reseal layer (reseal layer) (20) remaining inside the cap (C), and It is comprised from the membrane layer (seal layer) (10) which adheres to the container opening part (h) of a container main body (B), and becomes a lid | cover material.

  The reseal layer (20) is a sand resin layer serving as an adhesive when the elastic base layer (14), the adhesive layer (13), the thermoplastic resin layer (12) and the membrane layer (10) are integrated. (11) is sequentially stacked.

  The membrane layer (10) has a metal thin film layer (2) on the heat-adhesive resin layer (1) and a pattern with the same shape and the same size width as the upper end surface (g) of the opening of the container mouth (h). The protective thin layer (3) used when etching is left on the metal thin film layer (2), and the metal thin film layer (2) is removed by etching. The sealing varnish layer (4) and the release varnish layer (5) to be the layer (7) are formed in a solid form, and the heat seal varnish layer (6) is sequentially formed on the release varnish layer (5) in a point shape. It has been configured.

  In addition, as shown in FIG. 2, the layer structure of the inner seal material (A) for sealing the container mouth portion of another embodiment of the present invention is the same as that of the above-described embodiment of the heat adhesive resin layer (1). And a metal thin film layer (2) are provided with a support layer (8).

  Here, the formation process of the membrane layer (10) described above will be described in detail with reference to FIG. (1) In the step, a heat-adhesive resin layer (1) having adhesiveness is laminated on the container mouth (h) of the container body (B) on one surface of the metal thin film layer (2). (2) The protective varnish layer (3) is formed in a pattern with the same shape and the same size width as the upper end surface (g) of the opening of the container mouth (h) on the other surface of the metal thin film layer (2). Apply. (3) In the step, the laminate of the metal thin film layer (2) and the heat-adhesive resin layer (1) coated with the protective varnish layer (3) in the pattern produced in the previous step is immersed in an etching solution. The portion where the protective varnish layer (3) is not applied is etched. (4) In the process, on the surface from which the metal thin film layer (2) has been removed by etching, the sealing varnish layer (4) and the release varnish layer (5) to be the easy peelable layer (7) are made solid. Further, a heat seal varnish layer (6) is formed in a point shape on the release varnish layer (5).

  Subsequently, a thermoplastic resin layer (12) is laminated on the heat seal varnish layer (6) surface of the membrane layer (10) formed as described above via a sand resin layer (11), and further an adhesive layer. Through (13), the elastic base material layer (14) is laminated to form the reseal layer (20), and the inner seal material (A) for sealing the container mouth of the present invention is produced.

  Next, the inner seal material (A) raw fabric is punched into a predetermined shape and, as shown in FIG. 3, the cap (C) is attached to the container mouth (h) after being attached to the inside of the cap (C). When it is crowned, the inner seal material (A) in the cap (C) is elasticated by the elastic base material layer (14) constituting the reseal layer (20), and the upper end surface of the opening of the container mouth (h) ( g), the metal thin film layer (2) generates heat by passing through the magnetic field by the high frequency induction heating method, and the thermoadhesive resin layer (1) is laminated immediately below the metal thin film layer (2). Therefore, the heat conduction resin layer (1) melts in a short time and adheres completely to the upper end surface (g) of the opening of the container mouth (h), and the container mouth (h ) Can be hermetically sealed. Here, d is a rib projecting on the inner side of the cap, e is a thread on the outer surface of the container mouth, and f is a thread on the inner side of the cap.

  At this time, the metal thin film layer (2) is formed in a pattern on the heat-adhesive resin layer (1) with substantially the same shape and the same width as the upper end surface (g) of the opening of the container mouth (h). As a result, the heat generated from the metal thin film layer (2) is only in the container mouth portion (h) of the lowermost thermoadhesive resin layer (1) constituting the membrane layer (10) and the portion involved in the sealing. The temperature of the resin layer is not increased and the central part of the membrane layer (10) is not involved. Therefore, the low-molecular weight resin and easily volatile components of the heat-adhesive resin layer (1), which is the sealant layer, do not adhere to the contents as a scent. Further, in the circular inner seal material, heat is not transferred from the circumferential portion of the membrane layer (10) to the central portion by heat conduction, and energy efficiency is improved.

  Next, the inner sealing material (A) for sealing the container mouth according to the present invention described above is loaded into the cap (C), and the cap (C) is attached to the container mouth (h) and sealed. 3, the cap (C) is removed from the container body (B) to remove the cap (C) from the state shown in FIG. The layer (11) is peeled at the interface between the release varnish layer (5) and the heat seal varnish layer (6) and separated into the reseal layer (20) and the membrane layer (10). The reseal layer (20) is the cap (C). The membrane layer (10) remains in the state of being loaded inside the container, and the thermoadhesive resin layer (1) adheres to the upper end surface (g) of the opening of the container mouth (h). (H) is sealed.

  The membrane layer (10) may be removed from the container mouth (h) or left as it is in the container mouth (h). After the membrane layer (10) is removed, when the cap (C) is crowned on the container mouth (h) again, the container mouth (h) can be sealed by the elasticity of the elastic base material layer (14).

  Moreover, in the said easily peelable layer (7), by forming a heat seal varnish layer (6) in a point shape on the peel varnish layer (5), the peel varnish layer (5) and the heat seal varnish layer (6) Since it becomes easy to adjust the adhesive strength between the surface and the sand resin layer (11), that is, the adhesive strength between the reseal layer (20) and the membrane layer (10), the inner seal material (A) is capped (c). The reseal layer (20) and the membrane layer (10) do not peel off until they are attached to the container, and when the cap (C) is removed from the container body (B), the reseal layer (20) The membrane layer (10) can be separated.

  Next, the materials used for each layer of the reseal layer (20) and the membrane layer (10) constituting the inner seal material (A) for sealing the container mouth of the present invention will be described in detail.

  As described above, the reseal layer (20) serves as an adhesive when the elastic base layer (14), the adhesive layer (13), the thermoplastic resin layer (12), and the membrane layer (10) are integrated. The sand resin layer (11) to be fulfilled is sequentially laminated.

First, the elastic base layer (14) has a basis weight of 400 to 400, which is made of a pulp obtained by chemically or mechanically treating a plant raw material such as wood to take out cellulose.
A paperboard of about 650 g / m ^2, a foamed sheet made of foamed polyethylene, foamed polystyrene, foamed urethane, or the like, a laminate of paperboard and foamed sheet, a single cardboard sheet, or the like can be used.

  Next, the adhesive layer (13) is not particularly limited as long as it is a material capable of laminating the elastic substrate layer (14) and the thermoplastic resin layer (12). (14) and a specific method used for the thermoplastic resin layer (12) and a laminating method (lamination method) suitable for the combination of the materials.

  Examples of the lamination method include, for example, known methods such as a wet lamination method, a dry lamination method, a non-solvent dry lamination method, a hot melt / wax lamination method, an extrusion lamination method, and a sandwich lamination method using the extrusion lamination method. The method can be used.

  The wet lamination method is a method in which a water-soluble adhesive is applied to one base material, the adhesive is laminated with the other base material in a wet state, and then the water is evaporated and dried by a drying apparatus. It is. In this case, an adhesive such as polyvinyl acetate, polyacrylic acid ester or gum arabic can be used for the adhesive layer (13).

  Next, the dry lamination method includes three sections: a coating unit for applying an adhesive on a film, a drying device, and a nip roller unit, and an unwinding, winding, and tension control system.

  The coating part generally uses a gravure roll coating method or a reverse roll coating method.

  For the adhesive layer (13) used in the dry lamination method, generally, an adhesive for laminating such as polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, etc. is used. be able to.

  As the lamination adhesive, a solvent-type adhesive or a solvent-free adhesive is used. However, when a solvent-free adhesive is used, a drying apparatus is unnecessary, and in particular, a non-solvent dry lamination method and I'm calling.

  Next, the hot-melt / wax lamination method includes hot-melt adhesion of heat-melted wax, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), petroleum resin, low molecular weight polyethylene, and the like. In this method, an agent is applied on one base material, and the other base material is immediately laminated.

  In the extrusion lamination method, a thermoplastic resin such as a polyethylene resin or a polypropylene resin is heated, dissolved in a cylinder called a cylinder, extruded by applying pressure with a screw, and called a T die at the tip of the cylinder. This is a method in which a resin dissolved in a curtain shape is extruded from a thin slit to form a film and then laminated to a laminate substrate.

  At this time, using the extrusion lamination method, it is also possible to use a sandwich lamination method in which a thermoplastic resin such as polyethylene or polypropylene is used instead of an adhesive and one substrate is laminated with the other substrate. it can.

  Next, as the thermoplastic resin layer (12), for example, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a high density polyethylene resin (HDPE), and a linear low density polyethylene resin (L-LDPE). ), Polypropylene resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene- Methacrylic acid copolymer (EMAA), ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid ester copolymer, ionomer resin, ethylene-vinyl acetate copolymer (EVA), saponified EVA, carboxylated EVA, saponified carboxyl EVA, polyvinyl butyral resin, polyacrylic Over preparative resin, polyamide resin, polyester resin, vinyl chloride - a resin such as vinyl acetate copolymer can be used.

  Next, the sand resin layer (11) serves as an adhesive when the reseal layer (20) and the membrane layer (10) are integrated, and a polyolefin resin such as a polyethylene resin or a polypropylene resin is used. It is preferable from the viewpoint of workability and cost.

  Next, as described above, the metal thin film layer (2) constituting the membrane layer (10) is placed on the top surface (g) of the opening of the container mouth (h) on the thermoadhesive resin layer (1). Are formed in a pattern with almost the same shape and the same size width, and the protective thin layer (3) used when etching is left on the metal thin film layer (2), and the metal thin film layer (2) is etched. Then, the sealing varnish layer (4) and the release varnish layer (5) constituting the easily peelable layer (7) are completely solid on the removed surface, and further heated on the peelable varnish layer (5). The seal varnish layer (6) is sequentially formed in a point shape (dot shape).

  As the thermal adhesive resin layer (1), since the adherend surface is a glass surface, a resin having adhesiveness to the glass material is required. For example, ethylene-methacrylic acid copolymer (EMAA), ethylene-vinyl acetate copolymer (EVA), paraffin wax, tackifier (rosin, xylene resin, terpene resin, styrene resin, etc.), filler ( Calcium carbonate, barium carbonate, titanium oxide, etc.), hot-melt type coating agents obtained by mixing, melting and kneading antioxidants at a predetermined blending ratio, polyethylene WAX coating agents, etc. can be used. .

  As the method for forming the thermal adhesive resin layer (1) on the metal thin film layer (2), the extrusion lamination method is used in the case of the resin such as the ethylene-methacrylic acid copolymer (EMAA). . In the case of a hot melt type coating agent, a gravure roll coating method, a reverse roll coating method, or the like is used. The thickness of the heat-adhesive resin layer (1) is preferably in the range of 2 to 100 μm, more preferably in the range of 5 to 70 μm, considering heat seal strength, workability, and the like.

  Next, as the metal thin film layer (2), an aluminum foil, an aluminum foil reinforced with a synthetic resin, an aluminum vapor deposition film, or the like can be used. The thickness of the aluminum foil is preferably about 6 to 30 μm.

Examples of the base film for aluminum deposition include polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polyethylene (PE), polypropylene (PP), Polyolefin such as polystyrene (PS), polyamide (PA) such as nylon-6, nylon-66, polycarbonate (PC), polyacrylonitrile (PAN), polyimide (PI), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC) ), Polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), polyether sulfone (PES), polymethyl methacrylate (PMMA), etc. It can be used.

  As a method of forming an aluminum vapor deposition layer on such a base film, a vacuum vapor deposition method, a sputtering method, or the like can be used, but the vacuum vapor deposition method is preferable in consideration of productivity.

  There are three types of vacuum deposition methods, depending on the form of the body to be vapor-deposited. 1) Batch method: vapor deposition method of molded products, 2) take-up semi-continuous method: vacuum for roll-shaped film (web) After unwinding, vapor deposition, and winding in the system, return to the atmospheric system again and take out the vapor deposition product. 3) Unwinder (unwinding device) for roll type film (web) ) And a rewinder (winding device) are arranged in the atmospheric system, and a vapor deposition drum and an evaporation source are arranged in a vacuum system to vaporize the evaporated substance on a roll film (web). This is a completely continuous method called a to-air method and has a feature of high productivity.

  When evaporating a vaporized material on a roll-shaped film (web), a take-up semi-continuous method is particularly widespread. Describes the internal structure. First, the constituent elements are a roll film (web), an evaporation source, an evaporation substance, a vapor deposition drum, a vacuum system, an unwinder (unwinding device), a rewinder (winding device), a guide roll, and the like.

  Next, the outline of the work process will be described. First, as a preparatory step, the door of the vacuum evaporation apparatus is opened, a roll-shaped film (web) is set in the unwinder (unwinding apparatus), and it is arranged between the unwinder and the evaporation drum. The web is caused to travel to the vapor deposition drum through a guide roll that is wound around the rewinder (winding device) via a guide roll disposed between the web and the rewinder (winding device). Preparation of vapor deposition of the evaporating substance on is completed.

  Next, the door of the vacuum deposition apparatus is closed, and the vacuum suction chamber in the vacuum deposition apparatus and the vacuum deposition chamber divided by the partition walls are set to a predetermined vacuum environment by a vacuum pump, and the web is unwound from the unwinder. The evaporating substance is evaporated on the web by evaporating the evaporating substance from the evaporation source disposed at the lower part of the evaporating drum on the web that has been run through the guide roll. Since the vapor deposition drum is cooled, the vaporized substance is recrystallized and fixed on the web, and the web vapor deposited via the guide roll on the rewinder side is wound around the rewinder.

The internal structure of the vacuum deposition apparatus is divided into a vacuum suction constant pressure chamber and a vacuum deposition chamber by a partition, and the vacuum suction constant pressure chamber is composed of an unwinder, guide roll, tension control device, speed control device, position control device, and vapor deposition drum. Some rewinders are arranged. In the vacuum deposition chamber, a part of the deposition drum, an evaporation source, and a heating device thereof are arranged. The vacuum suction constant pressure chamber has a degree of vacuum of 1 by a vacuum pump arranged around the vacuum deposition apparatus main body. × 10 ⁰ MPa about, the vacuum deposition chamber provided via the partition wall is set to a degree 1 × 10 ^-2 MPa (SI units). Since the two chambers are divided by the partition walls, impurities (dust) such as gas generated from the web in the vacuum suction constant pressure chamber rarely adversely affect the deposition in the vacuum deposition chamber. On the contrary, the radiant heat from the evaporation source arranged in the vacuum deposition chamber has little influence on the vacuum suction constant pressure chamber, so that the influence of the heat on the web is small.

  The vacuum deposition method is also a heating method: 1) Indirect resistance method, 2) Direct resistance heating method (wire feed method), 3) High frequency induction heating method, 4) Electron beam method (Electoron Beam, EB method for short) 4 There are two methods, but the electron beam method with good energy conversion efficiency is most suitable.

  The wound-up electron beam vacuum deposition method is a method in which the evaporative material is directly irradiated with an electron beam and scanned on the surface of the evaporative material, and the surface of the evaporative material is heated. And evaporating the evaporated substance.

  The thickness of the deposited thin film layer is preferably in the range of 5 to 400 nm. If the film thickness is less than 5 nm, a uniform film cannot be provided, so that a sufficient gas barrier property cannot be obtained. If the film thickness exceeds 400 nm, flexibility is lost, and due to external factors such as bending and pulling, the deposited film is not formed. It is not preferable because cracks and peeling easily occur.

  In addition, a printing ink layer (not shown) such as letters and pictures can be provided on the upper surface of the metal thin film layer (2). The printing ink for forming the printing ink layer includes a color material composed of a pigment or a dye that imparts color to the ink, a resin that is fixed to a printed material while the color material is dispersed and held in fine particles, and the resin A vehicle composed of a solvent that can stably dissolve, disperse the pigments and dyes, maintain the fluidity of the ink, and transfer an appropriate amount of ink from the printing plate, and further disperse the coloring material For the purpose of improving color developability, preventing precipitation, and improving fluidity, it is formed from an auxiliary agent such as a surfactant, but the colorant is preferably a pigment with good weather resistance.

  The printing method for providing the printing ink layer is not particularly limited as long as it is a printing method capable of printing on the metal thin film layer (2), but a base is formed by applying copper plating on the surface of an iron cylinder (cylinder). Then, a release layer is provided on the copper-plated surface, copper is further plated, and the surface is mirror-polished to create a recess (cell) by engraving or corrosion, and printing in the cell A gravure printing method in which the ink is transferred to the upper surface of the metal thin film layer (2) is preferable.

  Next, the protective bislayer (3) used in the membrane layer (10) formation step described above is preferably a varnish that is anticorrosive to an etchant such as sodium hydroxide. For example, isocyanate-based or polybutadiene-based varnish can be used. In addition, the sealing two-layer (4) can use varnishes such as isocyanate, polybutadiene, organic titanium, and polyethyleneimine.

  The release varnish layer (5) may be a nitrocellulose-based, polyamide-based, acrylic-based, rubber-based, polyester-based, polyurethane-based or other varnish. Moreover, it is good also as a composition which added polyethylene-type wax, polyester-type wax, and silicone resin to these varnishes. Since these varnishes have a weak releasability with a sand resin layer (11) made of polyolefin resin such as polyethylene and polypropylene, the sand resin layer (11) melt-extruded on the surface of the release varnish layer (5). By laminating, the adhesive strength between the release varnish layer (5) and the sand resin layer (11) can be appropriately adjusted.

  For the heat seal varnish layer (6), varnishes such as chlorinated polypropylene and ethylene-vinyl acetate copolymer can be used. These varnishes adhere well because of their good affinity with the sand resin layer (11) made of polyolefin resin such as polyethylene and polypropylene. Therefore, by forming the heat seal varnish layer (6) so that these varnishes have a predetermined area ratio in the form of points (dots), grids, lines, etc. on the surface of the release varnish layer (5) It is easy to adjust the adhesive strength between the sand resin layer (11) and the release varnish layer (5) and the heat seal varnish layer (6), that is, the adhesive strength between the reseal layer (20) and the membrane layer (10). Thus, the reseal layer (20) and the membrane layer (10) are peeled until the inner seal material (A) for sealing the container mouth is loaded in the cap (C) and attached to the container mouth (h). When removing the cap (C) from the container body (B), the reseal layer (20) and the membrane layer (10) can be separated with a weak force.

  As a method of forming the above-mentioned protective two-layer (3), sealing two-layer (4), release varnish layer (5), and heat seal varnish layer (6), a gravure roll coating method, a reverse roll coating method, etc. Used.

  Specific examples of the present invention will be described below.

<Example 1>
An ordinary aluminum foil having a thickness of 20 μm was subjected to an extruder process with an ethylene-methacrylic acid copolymer (EMAA) having an adhesiveness to glass having a thickness of 50 μm. Further, a protective cloth was applied on the opposite surface of the aluminum foil to the EMAA in the same shape as the mouth of the glass bottle container by a gravure roll coating method. The size at that time was ± 2 mm crossing the bonding width (2 mm) of the glass bottle, and it was coated in an annular shape (doughnut shape) having a total width of 6 mm.

  Next, the aluminum foil / EMAA laminated film coated with the protective cloth was immersed in a 0.2 mol / L sodium hydroxide aqueous solution to etch the aluminum foil. An easy-release layer was formed by sequentially forming a seal bis (all solids), a peeling varnish (all solids), and a heat seal varnish (points) on the etched surface of the aluminum foil by a gravure roll coating method.

  Further, the surface of the easy release layer and a stretched polyethylene film having a thickness of 25 μm were subjected to sand lamination with a low density polyethylene resin (LDPE) (thickness 25 μm).

Subsequently, the stretched polyethylene film surface and a cap base paper having a basis weight of 600 g / m ² were bonded together by wax lamination. The wound laminate was cut into pieces and then punched into a disk with a diameter of 51 mm to produce an inner seal material for sealing the container mouth. (In some cases, the coiled laminate is not cut into a single sheet, and the coiled laminate is used as it is, and punching is performed on an integrated line).

<Example 2>
In Example 1, an ordinary aluminum foil having a thickness of 20 μm is subjected to an extrusion process with a cyclic polyolefin having a thickness of 25 μm, and a polyethylene wax having a thickness of 30 μm is adhered to the glass by a gravure roll coating method. An inner seal material for sealing the container mouth was prepared in the same manner as in Example 1 except that the gravure coating was applied.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
In Example 1, an inner seal material for sealing the container mouth was prepared in the same manner as in Example 1 except that the aluminum foil etching step (protective double coating, etching, sealing double coating) was not performed. .

  The inner seal material for sealing the container mouth obtained in Examples 1 and 2 and Comparative Example 1 is set on the cap, and is tightened with a tightening torque of 30 kgf · cm, and is 1.0 seconds and 1 at a high frequency of 45 KHz. Heating was performed at an oscillation time of .5 seconds and 2.0 seconds, and puncture strength (N), finger puncture property, sealing property, puncture strength (KPa), and odor were evaluated.

<Evaluation method>
Puncture strength (N) was measured numerically with a needle having a tip diameter of 1 mm and R of 0.5 mm. The finger piercing property is a sensory test to check if a hole can be easily drilled with a finger after sealing, removing the cap and leaving the membrane alone. To check the sealing performance, open it by hand and visually check for any unbonded parts. Puncture strength is measured when air is sent into the container and the sealing surface is peeled off. The odor is welded using an empty container and immediately opened to evaluate the odor inside the container. (From good to low ranking, ◎ → ○ → △ → ×)
<Evaluation results>
About the said Examples 1-2 and the comparative example 1, puncture strength (N), finger puncture property, sealing performance, puncture strength (KPa), and odor were evaluated. In particular, sealability, puncture strength (KPa), and odor were evaluated for each oscillation time of 1.0 seconds, 1.5 seconds, and 2.0 seconds. The results are shown in Table 1.

表１は、実施例１〜２、及び比較例１について、突刺し強度（Ｎ）、指突刺し性、密封性、パンク強度（ＫＰａ）、臭気を評価した結果の表である。特に、密封性、パンク強度（ＫＰａ）、臭気は、１．０秒と１．５秒、及び２．０秒の発振時間毎に評価した結果を示す表である。

Table 1 is a table showing the results of evaluating puncture strength (N), finger puncture property, sealing property, puncture strength (KPa), and odor for Examples 1 and 2 and Comparative Example 1. In particular, the sealing property, the puncture strength (KPa), and the odor are tables showing the results of evaluation for each oscillation time of 1.0 seconds, 1.5 seconds, and 2.0 seconds.

  As is apparent from the results in Table 1, Examples 1 and 2 of the present invention have no problem in both adhesiveness and odor because they efficiently heat only the mouth portion of the glass bottle container even if the oscillation time is short. In Comparative Example 1 of the conventional product, when the oscillation time is increased, the adhesion is improved, but the amount of odor generated is increased and the odor is affected.

It is a sectional side view which shows one Example of the layer structure of the inner seal material for container opening part sealing which concerns on this invention. It is a sectional side view which shows the other Example of the layer structure of the inner-sealing material for container opening part sealing which concerns on this invention. It is a sectional side view which shows the state which loaded the inner seal material for container opening part sealing which concerns on this invention in a cap, this cap was crowned on the container opening part, and was sealed. FIG. 4 is a side cross-sectional view showing a state in which a reseal layer remains in the cap and a membrane layer remains in the container mouth when the cap is removed from the container body from the state shown in FIG. 3. It is explanatory drawing explaining the formation process of the membrane layer which comprises the inner seal material for container opening part sealing which concerns on this invention. It is a sectional side view which shows one Example of the layer structure of the conventional inner seal material for container opening part sealing.

Explanation of symbols

A ... Inner seal material for sealing the container mouth B ... Container body C ... Cap 1 ... Thermal adhesive resin layer 2 ... Metal thin film layer 3 ... Protective double layer 4. -Sealing bis layer 5 ... Peeling varnish layer 6 ... Heat seal varnish layer 7 ... Easy peel layer 8 ... Support layer 10 ... Membrane layer (seal layer)
DESCRIPTION OF SYMBOLS 11 ... Sand resin layer 12 ... Thermoplastic resin layer 13 ... Adhesive layer 14 ... Elastic base material layer 20 ... Reseal layer (reseal layer)
d: rib projecting on the inner side of the cap side e: thread on the outer surface of the container mouth f: thread on the inner side of the cap side g: upper end surface of the opening h: container mouth Part

Claims (3)

  Residual layer having at least an elastic base material layer and a thermoplastic resin layer left inside the cap, and at least a metal thin film layer and a thermoadhesive resin layer that are attached to the container mouth portion of the container body to become a lid. In an inner seal material for sealing a container mouth part, which is laminated in a peelable manner with a membrane layer, the metal thin film layer has substantially the same shape and the same size as the upper end surface of the opening part of the container mouth part on the thermoadhesive resin layer An inner seal material for sealing a container mouth, which is formed in a pattern with a width.   2. The inner sealant for sealing a container mouth according to claim 1, wherein the metal thin film layer is made of an aluminum foil or an aluminum vapor deposition film.   The inner seal material for sealing the container mouth portion according to claim 1 or 2 is attached to the inside of the cap, and the cap is attached to the container mouth portion of the container body, and then the heat-adhesive resin layer is melted by a high frequency seal method. A container mouth portion sealing method comprising: sealing the container mouth portion by bonding the inner seal material to an upper end surface of the opening portion of the container mouth portion.

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