JPH0554314U - Inner seal material and hermetic seal material compatible with containers of various materials - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides an inner seal material that can be applied to containers of various materials, has proper easy peeling properties, has little variation in peel strength, and has a wide range of sealing conditions. [Structure] Inner seal consisting of paperboard, foamed plastic film, reseal layer laminated with single layer or multi-layer plastic film and peeling varnish, pattern printing, aluminum foil, membrane layer laminated with single layer or multi-layer plastic film In the material, the material which is heat-sealed with the material of the container opening member is used as the lowermost layer which is heat-sealed with the container opening portion of the membrane layer, and the portion which is heat-sealed with the container opening portion by the opening force at the time of opening the container Provides a thin plastic film layer which is cut within the layer at the boundary with the non-heat-bonded portion and at the same time peels away from the adjacent upper layer.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an inner seal material and a hermetic seal material that can be applied to containers made of various materials used for foods and non-foods.

[0002]

[Prior Art]

 Various materials such as glass, polyethylene, polypropylene, and polystyrene are used for containers (generally wide-mouthed containers) used for foods such as coffee and lactic acid bacteria drinks, and non-foods such as medicines and cosmetics. At the mouth of these containers, an inner sealing material having an aluminum foil for sealing and a hermetic sealing material were heat-sealed by a high frequency induction heating method. As shown in FIG. 3, as a typical example of the inner seal material (3), a foamed plastic film (313), a plastic film (315), etc. are provided on the paperboard (311) of the base material with the adhesive layers (312, 314). Reseal layer (31) and adhesive wax (325), peeling varnish (321), printed pattern (326), aluminum foil (322), plastic film (323) etc. The cap consisted of a membrane layer (32) that adheres to the container mouth when detached and separates from the reseal layer, and the reseal layer and the membrane layer were laminated via an adhesive layer (316). The hermetic seal was a laminate of a protective varnish, a pattern printed aluminum foil, a plastic film and the like.

[0003]

[Problems to be solved by the device]

 However, a polyethylene film is generally used as the bottom layer of the inner seal material or the hermetic seal material that is heat-sealed to the mouth of the container. It often adhered too much to and lacked in easy peeling. Also, in the case of glass bottles, the sealing material does not heat-bond in that case, so it is sealed after the ionomer resin layer is provided at the mouth of the glass bottle. There is a problem that the smooth area of the part varies and the peel strength of the heat-sealed sealing material also varies, resulting in a narrow range of appropriate sealing conditions. The present invention provides an inner seal material and a hermetic seal material which can be applied to containers made of various materials, have proper easy peeling properties, have little variation in peel strength, and have a wide range of sealing conditions.

[0004]

[Means for Solving the Problems]

 As shown in FIG. 1, the present invention provides a release varnish (121) and a release layer (11) in which a paperboard (111), a foamed plastic film (113), a single layer or a multi-layered plastic film (115) are laminated. An inner seal member comprising a printed pattern (126), an aluminum foil (122), and a membrane layer (12) in which a single-layer or multi-layer plastic film (123) is laminated, and the container mouth portion of the membrane layer. As shown in FIGS. 4 (a) and 4 (b), the container mouth member is heat-sealed with a material that is heat-sealed with the container mouth member, and the container mouth portion ( 4) A container of various materials provided with a thin plastic film layer (124) that is cut at the boundary between the heat-sealed portion (127) and the non-heat-sealed portion in the layer, and at the same time peels from the adjacent upper layer. The applicable inner seal material (1) was laminated with a protective varnish (201), a printed pattern (206), an aluminum foil (202), a single layer or a multilayer plastic film (203), etc., as shown in FIG. In the hermetic sealing material, a material which is heat-sealed with the material of the container mouth is used as the lowermost layer which is heat-sealed with the container mouth of the hermetic seal material, as shown in FIGS. 5 (a) and 5 (b). In addition, a thin plastic film that is cut at the boundary between the container mouth and the heat-sealed portion (207) at the non-heat-sealed portion in the layer due to the opening force at the time of opening the container, and at the same time peels from the adjacent upper layer. It is a hermetic sealing material (2) that can be applied to containers of various materials provided with a layer (204).

The lowermost thin plastic film layer that is heat-sealed to the container mouth portion of the present invention has a layer thickness of 3 μm to 10 μm.

This thin plastic film layer is bonded to the adjacent upper layer with an adhesive strength weaker than the heat fusion strength with the container mouth.

[0007]

[Action]

 The membrane layer of the inner seal material according to claim 1 and the hermetic seal material according to claim 2 which are heat-sealed to the mouth portion of the container, are the external force to the upper side and the external force that try to peel the seal material when the container is opened. Due to the downward force that tends to adhere to the container mouth as a reaction force generated by the heat, the container is heat fused to the container mouth in the layer of the thin plastic film layer provided at the bottom of the sealing material. A vertical cutting force is generated at the interface between the welded part and the non-heat-sealed part. For this reason, at the same time as the part that is heat-sealed to the container mouth in the layer and the non-bonded part are cut and separated, at the same time, the part of the thin plastic film that is heat-sealed to the container mouth is adjacent. Since the adhesive force with the upper layer is smaller than the heat fusion force with the container mouth, it peels from the adjacent upper layer. As a result, the thin plastic film layer heat-sealed to the container mouth remains in the container mouth, and the non-heat-sealed part is peeled off from the container together with the sealing material.

Further, the membrane layer of the inner seal material and the thin plastic film as the lowermost layer of the hermetic seal material are made of a material that is heat-sealed to the material of the container, and thus can be used for containers of various materials. It will be possible.

Further, the peel strength of the membrane layer of the inner seal material and the hermetic seal material of the present invention is mainly due to the adhesive force between the thin plastic film layer heat-sealed to the mouth of the container and the adjacent upper layer. Therefore, the variation in peel strength is reduced as compared with the conventional peeling of the bottommost plastic film that is heat-sealed to the container mouth.

[0010]

【Example】

Example 1 First, as shown in FIG. 1, a paperboard (111) having a basis weight of 535 g / m ² and a foamed polyethylene sheet (113) of 5 times expansion were wax-laminated into wax (112). A 25 μm-thick non-stretched polypropylene film (115) was laminated on the surface of the foamed polyethylene sheet, and the polypropylene (114) was adhered by the extrusion lamination method to form a reseal layer (11) to prepare a laminated sheet. .

Next, by a co-extrusion method, a heat-resistant polypropylene (12 μm) / adhesive polypropylene (8 μm) / polyethylene (5 μm, 124) 25 μm three-layer multi-layer film (123) was extruded. A 30 μm-thick aluminum foil (122) was attached to the layer side to produce a laminated sheet. Further, a picture (126) is printed on the aluminum foil surface of this laminated sheet by a gravure printing method, a release varnish layer (121) of vinyl acetate resin is applied on the picture (126), and the release varnish layer is applied on the release varnish layer. Then, a mixture (125) of microparaffin, EVA resin, and tacky fire for adhering to the laminated sheet of the reseal layer was formed into dots to prepare a laminated sheet to be the membrane layer (12).

Next, the unstretched polypropylene film surface of the laminated sheet to be the reseal layer and the release varnish layer in which the adhesive of the laminated sheet to be the membrane layer is formed like dots are extruded using polypropylene (116). The inner sealing material (1) of the present invention was produced by pasting together by a lamination method.

In order to evaluate the produced inner seal material of the present invention, a cap having the inner seal material of the present invention inserted therein was attached to a wide-mouthed container made of polyethylene and a wide-mouth glass bottle having an ionomer resin layer applied to the mouth, respectively, and high frequency was applied. When inserted into an induction coil that carries an electric current, a high-frequency current is induced in the aluminum foil of the constituent layers of the inner seal due to electromagnetic induction, generating Joule heat, and the thin polyethylene film (124) at the bottom layer of the inner seal is generated. Melted and were firmly heat-sealed to the mouth of each container. Next, remove the caps of the polyethylene wide-mouth container and the wide-mouth glass bottle respectively, and peel off the membrane layer heat-sealed to the container mouth by holding the outer edge, and both containers will be heat-sealed to the container mouth. The lowermost thin polyethylene film portion was peeled off from the adjacent upper layer while being adhered. In both containers, the peeling state of the membrane layer showed an appropriate easy peel, and there was little variation in peel strength between the containers and it was stable.

<Example 2> The production of the laminated sheet to be the reseal layer is the same as in Example 1.

Next, by co-extrusion method, while extruding a polypropylene film of 25 μm consisting of three layers having different melting point temperatures of high / middle / low, 30 μm of aluminum foil was attached to the polypropylene film layer side having the highest melting point. A laminated sheet was also prepared. The thickness of the lowermost polypropylene film layer having the lowest melting point was 5 μm. Further, a pattern is printed on the aluminum foil surface of this laminated sheet by a gravure printing method, a release varnish layer of vinyl acetate resin is applied on it, and the re-seal layer laminated sheet is adhered to this release varnish layer. For this purpose, a mixture of microparaffin, EVA resin, and tacky fire was formed in a dot shape to prepare a laminated sheet to be a membrane layer.

Next, the laminated sheet to be the reseal layer and the laminated sheet to be the membrane layer were attached in the same manner as in Example 1 to produce the inner seal material of the present invention.

In order to evaluate the produced inner seal material of the present invention, the cap having the inner seal material of the present invention inserted was mounted on a polypropylene wide-mouth container and inserted into an induction coil through which high-frequency current was passed. Similarly, a thin polypropylene film as the lowermost layer of the inner seal material was heat-sealed to the mouth of the container by an electromagnetic induction action. Next, the cap of the polypropylene wide-mouthed container was removed, and the membrane layer heat-sealed to the container mouth was peeled off by holding the outer edge, and the thin polyethylene film of the bottom layer heat-sealed to the container mouth was peeled off. The part was peeled off from the adjacent upper layer while being adhered. The peeling state of the membrane layer showed appropriate easy peeling, and there was little variation in peeling strength between the containers and it was stable.

Example 3 As shown in FIG. 2, a 25 μm three-layer multi-layer film (203 of polyethylene (12 μm) / adhesive resin (8 μm) / polystyrene (5 μm, 204) was prepared by the co-extrusion method. ) Was extruded, and a 30 μm aluminum foil (202) was attached to the polyethylene layer side to prepare a laminated sheet. Further, a pattern (206) is printed on the aluminum foil surface of this laminated sheet by a gravure printing method, and a protective varnish layer (201) of vinyl acetate resin is formed on the pattern (206) to form the hermetic sealing material (2) of the present invention. It was made.

Next, the mouth portion of the polystyrene wide-mouthed container was covered with the produced sealing material, and was inserted into an induction coil through which a high-frequency current was passed while pressurizing with a jig, and an electromagnetic induction action was performed as in Example 1. The thin polystyrene film, which is the bottom layer of the hermetic sealing material, was heat-sealed to the mouth of the container.

Next, the hermetic sealing material fused to the container mouth is peeled off by holding the outer peripheral edge, and the thin polystyrene film portion of the lowermost layer heat-sealed to the container mouth is adhering to the adjacent upper layer. Peeled from. The peeling state of the hermetic sealing material showed appropriate easy peeling properties and was stable with little variation in peeling strength between containers.

[0021]

[Effect of the device]

 The inner sealing material and the hermetic sealing material of the present invention do not depend on the sealing strength between the container and the sealing material for the peel strength unlike the conventional sealing material, but the thin plastic film at the bottom of the sealing material container is heat-sealed. Since it is determined by the adhesive strength between the part and the adjacent upper layer, the peel strength between the containers is stable and the proper easy peeling property is exhibited.

Further, since the material of the lowermost thin plastic film layer that is heat-sealed to the container of the sealing material of the present invention is a material that is heat-sealed to the material of the container, it can be used for containers of various materials. It is possible to

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of an inner seal material of the present invention.

FIG. 2 is a cross-sectional view showing the structure of the hermetic sealing material of the present invention.

FIG. 3 is a cross-sectional view showing the structure of a conventional inner seal material.

FIG. 4 is an explanatory view showing a state (a) when the inner seal material of the present invention is heat-sealed to a container mouth and a state (b) when peeled off.

FIG. 5 is an explanatory view showing a state (a) when the hermetic sealing material of the present invention is heat-sealed to the container mouth and a state (b) when peeled off.

[Explanation of symbols]

 1 …… Inner seal material of the present invention 2 …… Sealing seal material of the present invention 3 …… Conventional inner seal material 4 …… Container mouth part 11,31 …… Reseal layer 12,32 …… Memblem layer 111,311… ... Paperboard 112 ... Wax layer 113, 313 ... Expanded polyethylene sheet 114 ... Polyethylene layer 115, 315 ... Non-stretched polypropylene film 116 ... Polypropylene layer 121, 321 ... Release varnish layer 122, 202, 322 ... Aluminum Foil 123, 203 ... Multi-layer plastic film layer 124, 204 ... Thin plastic film layer 125, 325 ... Adhesive wax layer 126, 206, 326 ... Design print layer 127, 207 ... Heat-sealed to container mouth Part 201 ...... Protective varnish layer 312, 314, 316 ... Adhesive layer 32 ...... polyethylene film layer

Claims (2)

[Scope of utility model registration request] 1. An inner member comprising a resealing layer formed by laminating a paperboard, a foamed plastic film, a single layer or a multilayer plastic film, and a membrane layer formed by laminating a peeling varnish, a printed pattern, an aluminum foil, a single layer or a multilayer plastic film, etc. In the sealing material, the lowest layer that is heat-sealed with the container mouth of the membrane layer is made of a material that is heat-sealed with the material of the container mouth, and is heat-sealed with the container mouth by the opening force when opening the container. An inner seal material compatible with containers of various materials, characterized in that a thin plastic film layer that is cut at the boundary with the non-heat-sealed portion in the layer and is simultaneously peeled off from the adjacent upper layer is formed. 2. A protective varnish, a printed pattern, an aluminum foil,
In a hermetic sealing material obtained by laminating a single-layer or a multi-layer plastic film, etc., using a material that is heat-sealed with the container mouth member material in the lowermost layer that is heat-sealed with the container mouth of the hermetic sealing material,
Characterized by the provision of a thin plastic film layer that separates from the adjacent layer at the same time that the part that is heat-sealed and the part that is heat-sealed is cut at the boundary between the part that is not heat-sealed in the layer due to the opening force when opening the container A hermetic sealing material that can be used for containers of various materials such as.