JP2004123191A - Sealing film material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing film material which can surely seal a container by high frequency induction heating, and easily peel an inner seal by picking up a tab when unsealing the container to form a squeezing port on an opening of the container. <P>SOLUTION: The sealing film material 30 welded to an end surface of the opening 2 of the container 1 by high frequency induction heating for sealing the container 1 is constituted of a squeezing port forming film 40 mounted on the opening 2 of the container 1 during the high frequency induction heating and formed with the squeezing port 43; and the inner seal 50 mounted on the film 40. The film 40 has sealant layers (low density polyethylene layers 41) on both upper and lower surfaces. The inner seal 50 consists of a sealing part B and the tab A. The sealing part B consists of a weak adhesive layer 51, a synthetic resin film layer 54, a metallic layer 56 and a peeling layer 59. The tab A consists of a peeling layer 60, the synthetic resin film layer 54 and the peeling layer 59. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sealing film material that is welded to an end face of an opening of a container by high-frequency induction heating to seal the container.
[0002]
[Prior art]
As shown in FIG. 8 (a), as a method of sealing a container filled with mayonnaise, ketchup, etc., a decoration squeezing opening is formed on a laminated film of a sealant layer 11 made of polyethylene and a polyester film 12 on an opening 2 of the container 1. A squeeze port forming film 10 having an opening 13 is placed thereon, and a sealant layer 14 made of polyethylene, an aluminum flake 15 and a packing member 16 are further placed thereon, and the cap 3 of the container 1 is covered, and aluminum is applied by high frequency induction heating. A method is known in which the thin section 15 is heated to thereby thermally bond the sealant layer 11 to the end face of the opening 2 of the container 1 (see Patent Document 1).
[0003]
When using the container sealed in this way, first, the cap 3 is removed, and then the knob A from which a part of the packing member 16 is projected is pulled up. As a result, peeling occurs between the polyester film 12 and the sealant layer 11 of the squeeze port forming film 10, and the aluminum flake 15 and the sealant layer 14 are pulled up together with the packing member 16, and as shown in FIG. The opening forming film 10 remains in the opening 2 of the above, and the decoration opening 13 is formed.
[0004]
However, in such a sealing method, there is a problem in that the knob A is easily stuck to the wall surface of the opening 2 due to the high-frequency induction heating, and it is difficult to pick when opening.
[0005]
On the other hand, as shown in FIG. 9A, the inner seal 20 includes a sealing portion B located on the opening 2 at the time of sealing and a knob A protruding from the sealing portion B. B, a sealant layer 21, an aluminum foil 22, an aluminum membrane 24 made of a synthetic resin film 23 made of PET or PE, a packing member 26, and a temporary adhesive layer for weakly bonding the aluminum membrane 24 and the packing member 26. 25, the knob A is formed by laminating a film 27 for eliminating the adhesive effect of the sealant layer 21 below the aluminum membrane 24, or the sealant layer 21 is formed in the aluminum membrane 24 of the knob A. There has been proposed a configuration in which the component is not formed (see Patent Document 2).
[0006]
When the container is sealed using the inner seal 20, as shown in FIG. 10A, first, the knob A of the inner seal 20 is folded over the sealing portion B and mounted in the cap 3. Is placed on the opening 2 of the container 1 and high-frequency induction heating is performed to thermally bond the sealant layer 21 to the end face of the opening 2 of the container 1. At this time, since the sealant layer 21 is not formed on the surface of the knob A, the knob A is prevented from being thermally bonded to the cap 3.
[0007]
When using the container thus sealed, the cap 3 is first removed. As shown in FIG. 10B, when the cap 3 is removed, the packing member 26 is held in the cap 3 by the convex portion 4 formed on the inner wall of the cap. Get out of the gap with. Therefore, as shown in FIG. 10C, the knob A can be easily pulled up, the aluminum membrane 24 can be peeled off, and the container 1 can be opened.
[0008]
[Patent Document 1] Japanese Patent Publication No. 50-12358 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-191021 [0009]
[Problems to be solved by the invention]
By the way, as shown in FIG. 8, when the decoration squeezing port 13 is formed in the opening 2 of the container 1, the squeezing port forming film 10 is placed on the opening 2 of the container 1 and the end face of the opening 2 is set. Squeezing port forming film 10 must be securely welded to the end face of opening 2.
[0010]
However, in order to facilitate opening in this case, the inner seal 20 shown in FIGS. 9 and 10 is superimposed on the squeezing port forming film 10 and the knob A is folded over the sealing portion B to open the opening. When high-frequency induction heating is performed so that sufficient heat is applied to the end surface of the portion 2, the knob A is excessively heated due to the presence of the aluminum foil 22 in the knob A, and the folded knob A and the sealed portion B are packed. There is a problem that the member 26 is completely welded.
[0011]
On the other hand, it is conceivable to reduce the heating during the high frequency induction heating. However, if the heating during the high frequency induction heating is reduced, the squeezing opening forming film 10 cannot be reliably welded to the end face of the opening 2. .
[0012]
Therefore, the present invention, by high-frequency induction heating, to weld a film having a squeezing port to the end face of the opening of the container, in sealing the container, while reliably welding the film having a squeezing port, at the time of opening the container Another object of the present invention is to make it possible to easily open a container with a knob formed on a film.
[0013]
[Means for Solving the Problems]
In order to perform high-frequency induction heating in a state where a film having a squeezing port and an inner seal composed of a knob A and a sealing portion B are sequentially overlapped with each other at the opening of the container and the cap 3 is covered, If release layers are formed on both the upper and lower surfaces of the portion A, even if sufficient heat is applied to the end surface of the opening with the knob A folded back on the sealing portion B, the knob A will remain in the sealing portion B or the cap. 3 can be prevented, so that the film having the squeezing opening can be reliably welded to the end face of the opening of the container, and the knob A can be easily pulled up when the container is opened.
[0014]
That is, the present invention is a sealing film material which is welded to an end face of an opening of a container by high frequency induction heating to seal the container, and the sealing film material is placed on the opening of the container at the time of high frequency induction heating. The squeezing port forming film formed with a squeezing port, and an inner seal placed on the squeezing port forming film,
The squeeze port forming film has sealant layers on both upper and lower surfaces,
The inner seal consists of a sealing part and a knob,
Provided is a sealing film material in which the sealing portion of the inner seal comprises a weak adhesive layer, a synthetic resin film layer, a metal layer, and a release layer, and the knob portion comprises a release layer, a synthetic resin film layer, and a release layer.
[0015]
Further, the present invention provides a high-frequency induction-forming device in which the above-mentioned squeezing opening forming film of the sealing film material and the inner seal are sequentially placed on the opening of the container with the knob of the inner seal folded back on the sealing portion. Provided is a sealed container manufactured by heating, wherein the sealant layer of the squeezing port forming film is welded to the end face of the opening of the container, and the weak adhesive layer of the inner seal is peelably adhered to the squeezing port forming film. I do.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals indicate the same or equivalent components.
[0017]
FIG. 1 is a perspective view of a sealing film material 30 according to an embodiment of the present invention and a container 1 sealed with the sealing film material. FIG. 2 is a plan view of a squeezing opening forming film 40 constituting the sealing film material 30. 3A is an explanatory view of a layer structure thereof, and FIG. 3 is a plan view of an inner seal 50 constituting the sealing film material 30 and an explanatory view of the layer structure thereof.
[0018]
This sealing film material 30 is composed of a squeezing port forming film 40 and an inner seal 50. The squeezing opening forming film 40 and the inner seal 50 are sequentially placed on the opening 2 of the container 1 when the container 1 made of polyethylene (melting point 100 to 150 ° C.) filled with mayonnaise, ketchup or the like is sealed, and made of polyethylene or the like. When the high-frequency induction heating is performed with the cap 3 covered, the squeeze port forming film 40 is welded to the end face of the opening 2, and the inner seal 50 comes into close contact with the squeeze port forming film 40 in a peelable manner. .
[0019]
As shown in FIG. 2, the squeeze port forming film 40 is formed by laminating a low density polyethylene layer (melting point: 100 to 150 ° C.) 41 as a sealant layer on both upper and lower surfaces of a high density polyethylene layer 42. A decoration squeeze port 43 is opened in the portion. The shape of the opening of the squeeze port 43 is not particularly limited, and may be a star or the like.
[0020]
On the other hand, as shown in FIG. 3, when sealing the container 1, the inner seal 50 includes a sealing portion B located on the opening 2 of the container 1 and a knob A protruding from the sealing portion B.
[0021]
The sealing portion B is composed of a weak adhesive layer (melting point: 180 to 220 ° C.) 51 made of cellulose or the like, a low-density polyethylene layer (melting point: 100 to 150 ° C.) 52 having a thickness of 5 to 30 μm, and PET having a thickness of 10 to 60 μm. A synthetic resin film layer 54, a metal layer 56 made of aluminum foil having a thickness of 10 to 50 μm, a printed layer 58, and a release layer 59 made of cellophane having a thickness of 5 to 40 μm are bonded to the low-density polyethylene layer 52 and the synthetic resin film layer 54. The laminated film is formed by sequentially laminating an anchor coat layer 53 to be used and adhesive layers 55 and 57 for dry lamination for bonding the synthetic resin film layer 54 and the metal layer 56. In the present invention, the laminated film constituting the sealing portion B is such that the synthetic resin film layer 54 is laminated on at least one surface of the metal layer 56, and furthermore, the weak adhesive layer 51 is formed on the synthetic resin film layer 54 as the outermost layer. Any layer may be used as long as the release layer 59 is laminated as the outermost layer on the other surface of the metal layer 56. However, the laminated film having the layer configuration shown in FIG. Even a beautiful finish can be obtained.
[0022]
Further, the weak adhesive layer 51 of the sealing portion B forms a so-called easy peel, and the low-density polyethylene layer of the squeezing port forming film 40 having the squeezing port 43 by high-frequency induction heating when the container 1 is sealed. It is preferable to appropriately select a material for forming the material so that the material 41 is quasi-bonded with an adhesive strength of 2 to 12N. Thereby, the weak adhesive layer 51 and the low-density polyethylene layer 41 are brought into close contact with each other by high-frequency induction heating, so that the container 1 is securely sealed. When the sealed container is opened, the weak adhesive layer 51 is removed. The squeeze port forming film 40 can be easily peeled off from the low-density polyethylene layer 41 to leave the squeeze port forming film 40 in the opening 2 of the container, and the squeeze port 43 can be opened in the opening 2 of the container.
[0023]
Here, the adhesive strength between the weak adhesive layer 51 of the sealing portion B and the low-density polyethylene layer 41 of the squeezing port forming film 40 is determined by the high frequency induction heating of the squeezing port forming film 40 and the inner seal 50 on the opening 2 of the container. After that, as shown in FIG. 6, the container is fixed to a stand (Nidec Shinpo, vertical electric stand (for low speed)) 70, and the inner seal 50 is attached to a film chuck (Nidec Shinpo, GC -2-5) The peel strength of the inner seal 50 when sandwiched between 71 and pulled up is measured by a stress meter (Digital Force Gauge FGC, Nidec Shinpo Co., Ltd.) 72, and the measured data is measured by a data logger (KEYENCE Co., Ltd.). , Data logger NR-1000) 73 to a personal computer 74 and data processing.
[0024]
The knob A is a laminated film in which a release layer 60 made of cellophane, a low-density polyethylene layer 52, a synthetic resin film layer 54, a print layer 58, and a release layer 59 are sequentially laminated. Here, the low-density polyethylene layer 52, the synthetic resin film layer 54, the printing layer 58, and the release layer 59 are continuous with the corresponding layers of the sealing portion B.
[0025]
In addition, in the present invention, the laminated film constituting the knob A may be any as long as at least the synthetic resin film layer 54 and the release layers 59 and 60 as the outermost layers on the upper and lower surfaces thereof are formed. Therefore, a metal layer may be laminated inside the laminated film constituting the knob A for the convenience of the manufacturing process or the like, but the metal layer is used by the metal layer during high-frequency induction heating when the container 1 is sealed. In order to prevent A from being unnecessarily heated, it is preferable that the knob A has no metal layer.
[0026]
As a preferable method of sealing the container 1 using the sealing film material 30, first, the inner seal 50 is fitted into the cap 3 of the container 1 with the knob A folded back, and then the squeezing opening forming film 40 is attached to the cap 3. Then, the cap 3 is placed over the opening of the container 1 as shown in FIG. In this case, the high-frequency output is that the low-density polyethylene layer 41 of the squeezing port forming film 40 and the weak adhesive layer 51 are quasi-adhered with an adhesive strength of 2 to 12 N, and the squeezing port forming film 40 and the inner seal 50 form the container 1. Adjust to ensure that the seal is tight. More specifically, when the sealing degree of the container after the high frequency induction heating is tested using a leak test device shown in FIG. 7, the output during the high frequency induction heating is adjusted so as to be 10 kPa or more. In FIG. 7, reference numeral 80 denotes a vacuum chamber closely contacted with the shoulder of the container 1 by an O-ring, reference numeral 81 denotes a leak tester (Takachiho Seiki Co., Ltd., package leak tester PLT-3021FX), and reference numeral 82 denotes data processing. Personal computer.
[0027]
When opening the container 1 sealed by high-frequency induction heating, first, as shown in FIG. 4B, the cap 3 is removed, and the knob A is picked up and pulled up. At this time, the knob A is easily welded up without being welded to the upper surface of the inner seal 50. Further, although the squeezing port forming film 40 is completely welded to the end face of the opening of the container 1, the inner seal 50 is quasi-adhered to the squeezing port forming film 40 with an adhesive strength of 2 to 12N. By pulling up A, the inner seal 50 is peeled off as shown in FIG. 4C, the squeeze port forming film 40 remains at the opening 2 of the container 1, and the squeeze port 43 can be formed there.
[0028]
The sealing film material of the present invention can take various aspects other than those described above. For example, it is preferable to form a non-slip rib on the surface of the knob A of the inner seal 50 in order to facilitate picking up the knob A when opening the container. This rib can be formed as shown in FIG. 5, for example, by pressing the knob A of the inner seal 50 from above and below.
[0029]
The size of the knob A is not particularly limited, and may be substantially the same as the sealing portion B from the viewpoint of making the knob easier to pick.
[0030]
【The invention's effect】
By using the sealing film material of the present invention, the container can be securely sealed by high-frequency induction heating, and at the time of opening the container, the inner seal is easily peeled off by pulling up the knob, and the squeezing port is opened at the opening of the container. Can be formed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sealing film material and a container sealed with the sealing film material.
FIG. 2 is a plan view (a) of a squeezing port forming film and an explanatory view (b) of a layer configuration thereof.
FIG. 3A is a plan view of an inner seal and FIG. 3B is an explanatory view of a layer configuration thereof.
FIG. 4 is an explanatory view of a method of using a sealing film material.
5A is a plan view of an inner seal having a non-slip, and FIG. 5B is an explanatory view of a cross section thereof.
FIG. 6 is an explanatory diagram of a method for measuring the adhesive strength between a weak adhesive layer and a sealant layer.
FIG. 7 is an explanatory diagram of a leak test device.
8A and 8B are a cross-sectional view for explaining a conventional method of sealing a container and a top view with the container opened.
FIG. 9A is a plan view of a conventional inner seal, and FIG.
FIG. 10 is an explanatory diagram of a method of using a conventional inner seal.
[Explanation of symbols]
Reference Signs List 1 container 2 opening 3 cap 40 squeezing opening forming film 41 low density polyethylene layer 42 high density polyethylene layer 43 squeezing opening 50 inner seal 51 weak adhesive layer 52 low density polyethylene layer 53 anchor coat layer 54 synthetic resin film layer 55 adhesive Layer 56 Metal layer 57 Adhesive layer 58 Printing layer 59 Release layer 60 Release layer A Knob B Seal

Claims (5)

A sealing film material that is welded to the end surface of the opening of the container by high-frequency induction heating to seal the container, and the sealing film material is placed on the opening of the container at the time of high-frequency induction heating. The formed squeezing port forming film and an inner seal placed on the squeezing port forming film,
The squeeze port forming film has sealant layers on both upper and lower surfaces,
The inner seal consists of a sealing part and a knob,
A sealing film material in which the sealing portion of the inner seal comprises a weak adhesive layer, a synthetic resin film layer, a metal layer, and a release layer, and the knob portion comprises a release layer, a synthetic resin film layer, and a release layer. The sealant layer of the squeeze port forming film and the weak adhesive layer of the inner seal are quasi-adhered with an adhesive strength of 2 to 12 N by placing the inner seal on the squeeze port forming film and performing high frequency induction heating. The sealing film material as described. 2. The sealing film material according to claim 1, wherein no metal layer is laminated on the knob. 4. The sealing film material according to claim 2, wherein a non-slip rib is formed on a surface of the knob. The squeeze port forming film of the sealing film material according to any one of claims 1 to 4 and an inner seal are sequentially placed on the opening of the container with the knob of the inner seal folded back on the sealing portion. The seal is manufactured by high frequency induction heating, the sealant layer of the squeezing port forming film is welded to the end face of the opening of the container, and the weak adhesive layer of the inner seal is peelably adhered to the squeezing port forming film. container.

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