JP6255702B2 - Manufacturing method of inner seal material - Google Patents

Description

The present invention relates to a method for producing an inner seal material that is inside an outer lid cap and is affixed to a glass container mouth in order to ensure the sealing property, moisture resistance, and antioxidant performance of a glass container.

  An inner seal material is used to seal a glass container mouth portion of contents such as instant coffee and other foods and medicines that require sealing, moisture proofing, and oxidation prevention. The inner seal material is composed of a reseal layer that is separated by a release layer and left inside the outer lid cap when it is opened for the first time after sealing, and a seal layer that covers the mouth portion of the glass container at the opening stage. The sealing layer is then opened by breaking with a hand or an instrument to become an opening for taking out the contents. When all of the sealing layer is removed, the glass container mouth portion becomes the opening for removal as it is.

  On the other hand, the reseal layer remains on the outer lid cap side. When the outer lid cap is repeatedly opened and closed, the reseal layer is located between the outer lid cap and the glass container mouth. It has a function.

A method of high frequency sealing is known in which, when sealed, the glass container mouth is bonded to the glass container mouth after applying the inner seal material and the outer lid cap, applying energy in a non-contact manner using high frequency, and heat-sealing the inner seal material to the glass container mouth. ing.
This method utilizes the fact that the aluminum foil contained in the seal layer generates heat by high frequency.

JP 2004-35074 A

  In the conventional inner seal material, a reseal layer that remains on the outer lid cap side after opening, and a seal that forms an opening for taking out the contents after being bonded to the glass container mouth and broken after opening A multi-layer structure in which the parts are integrated through an adhesive varnish layer is used.

  As a material necessary for constituting the reseal layer, a cushion layer for sealing performance is required, and a layer having barrier properties for providing moisture resistance and antioxidant properties is required. Moreover, in order to adhere them, it is necessary to adhere | attach each layer using an extruder or a coater.

  On the other hand, the materials required for the seal layer include a release layer, an aluminum foil layer, a film layer such as PET, and a hot melt adhesive layer for adhesion to the container mouth, and an adhesive resin layer is required to adhere them. It becomes.

Various types of films and materials and inner seal materials made by bonding them together require a variety of processes and the repetition thereof, which has been a problem in terms of cost as well as complexity.
In the present invention, in addition to the sealing, moisture proof, and antioxidant properties required for the inner seal material, the inner seal material that can simplify the structure and shorten the process without impairing the virgin property and tamper resistance at the time of opening. It is an object to provide a manufacturing method .

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As means for solving the above-mentioned problems, the invention described in claim 1 includes at least a reseal layer in which a cushion layer, a thermoplastic resin layer, and an adhesive varnish layer are laminated, and at least a heat-resistant thermoplastic resin layer and an aluminum foil layer. The method for producing an inner seal material is characterized in that a step of adhering a sealing layer having an adhesive layer laminated thereon by high-frequency sealing and a step of adhering the sealing layer to a container opening by high-frequency sealing are performed simultaneously.

According to the present invention, it is possible to simplify the layer structure and simplify the manufacturing process without impairing the sealing property, moisture proofing property, and antioxidant performance required for the inner seal material, and ensuring the virgin property of the contents. It became.
That is, the laminating step of the inner seal material in the previous step could be omitted by performing the bonding of the reseal layer and the seal layer by one high frequency seal simultaneously with the container mouth portion adhesion.

It is the cross-sectional schematic diagram which showed the layer structure in one embodiment of the inner seal material manufactured by this invention. It is the cross-sectional schematic diagram which showed the layer structure in other one embodiment of the inner seal material manufactured by this invention. It is the cross-sectional schematic diagram which showed the layer structure in the other one embodiment of the inner seal material manufactured by this invention.

An embodiment of an inner seal material manufactured according to the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing in cross section the configuration of an embodiment of an inner seal material manufactured according to the present invention. This inner seal material consists of two parts, a reseal layer (1) and a seal layer (2). The reseal layer (1) includes a cushion layer (11), an adhesive layer (12), a thermoplastic resin layer (13), and an adhesive varnish layer (14).
The sealing layer (2) is composed of a heat-resistant thermoplastic resin layer (21), an adhesive layer (22), an aluminum foil layer (23), and an adhesive layer (24).

Of the reseal layer (1), the cushion layer (11) is for ensuring the sealing performance when the cap is closed even after opening, and paperboard, foamed plastic sheet, and corrugate can be used.
The cushion layer (11) is bonded to the thermoplastic resin layer (13) via the adhesive layer (12).
An OPP film of 20 to 100 μm can be used for the thermoplastic resin layer (13). Moreover, a stretched polyethylene film, an extruded polyethylene film, and a composite film thereof can be used as long as moisture resistance and antioxidant properties can be maintained.

Further, an adhesive varnish layer (14) is provided, which has a function of adhering the reseal layer (1) and the seal layer (2) during high frequency sealing.
As the adhesive varnish layer, a material that can be thermally bonded to the heat-resistant thermoplastic resin layer (21) on the seal layer (2) side can be selected. For example, a mixture of wax, synthetic resin flocculant, and tackifier can be used.

The adhesive varnish layer (14) functions as a release layer when it is opened for the first time after the inner seal material is adhered to the container opening by high frequency heating. The breaking sound at this time has a function of ensuring virginity with respect to the contents, but if the adhesive varnish layer (14) is too strongly bonded, reseal when opening the outer cap and opening it. The layer (1) and the seal layer (2) are difficult to peel off.
Furthermore, there is a risk that the basic functions as the inner seal material such as interlaminar fracture of the reseal layer (2) may be impaired.

  When the adhesion of the adhesive varnish layer (14) is too weak, there is a possibility that not only will there be no breaking noise when opening, but peeling may occur before attempting to open.

For this reason, as shown in FIG. 2, an adhesive force adjusting layer (15) can be provided. Adhesive strength adjusting layer (15) is provided on the side of heat-resistant thermoplastic resin layer (25) of adhesive varnish layer (14) to adjust the amount of adhesive varnish that oozes out during high frequency sealing, and has an appropriate adhesive strength as a release layer Can be.
A porous film or thin paper can be used for the adhesive force adjusting layer (15).
In the case of a perforated film, the size and density of the hole can be adjusted, and in the case of a thin paper, the amount of adhesive varnish that exudes can be adjusted by the amount of wrinkles.

  Moreover, as shown in FIG. 3, the adhesive force can be adjusted by providing an adhesive varnish layer (14) in a pattern.

  The heat-resistant thermoplastic resin layer (21) used for the sealing layer (2) is preferably a polyethylene terephthalate film having a thickness of 12 to 50 μm, but can withstand the heat generation of the aluminum foil layer (23) during high-frequency sealing. Any film that can be used can be used, and a stretched polypropylene film can also be used. When a stretched polypropylene film is used, a chlorinated PP-based adhesive varnish can be selected for the adhesive varnish layer (14) on the reseal layer (1) side.

The aluminum foil layer (23) is for the purpose of ensuring heat generation due to high frequency and sealing performance, moisture resistance, and antioxidant performance, and is preferably 12 to 30 μm.
The adhesive layer (24) may be a hot-melt type material that can be bonded to the glass container mouth portion by high-frequency sealing, and can be selected from polyester, EVA, polyolefin, butyral resin, and the like.

  For the purpose of improving the adhesion of the adhesive layer (24) to the aluminum foil layer (23), a polyethylene resin layer or a vinyl resin layer may be provided on the aluminum foil layer (23) as an anchor coat.

DESCRIPTION OF SYMBOLS 1 ... Reseal layer 2 ... Seal layer 11 ... Cushion layer 12 ... Adhesive layer 13 ... Thermoplastic resin layer 14 ... Adhesive varnish layer 15 ... Adhesive force adjustment layer 21- ..Heat resistant thermoplastic resin layer 22 ... Adhesive layer 23 ... Aluminum foil layer 24 ... Adhesive layer

Claims (1)

  A step of adhering at least a cushion layer, a thermoplastic resin layer, a reseal layer laminated with an adhesive varnish layer, and at least a heat-resistant thermoplastic resin layer, an aluminum foil layer, a seal layer laminated with an adhesive layer by high-frequency sealing; A method for producing an inner seal material, wherein the step of adhering to a container opening by high-frequency sealing is performed simultaneously.