JPH072454Y2 - Inner seal material for container mouth sealing - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention is, for example, an inner seal material for sealing the mouth of a container filled with coffee powder, cream powder, taste salt, chemical seasoning and the like. It is about.

“Prior art” For example, an inner sealing material for sealing the mouth of a container is attached to the mouth of a container such as a glass bottle filled with coffee powder or cream powder for the purpose of protecting the filler from moisture. ing.

The inner seal material comprises a reseal layer and a seal layer having a surface layer made of a releasable resin layer having releasability with respect to the back surface of the reseal layer, the back surface of the reseal layer and the surface of the seal layer. It is formed by punching a disc-shaped laminated sheet or a laminated sheet in which a reseal layer and a seal layer are adhered with wax, and the like.

The inner sealing material for sealing the container mouth portion includes a step of locking the inner sealing material on the inner surface of the back surface of the cap, and an inner seal locked on the inner surface of the back surface of the cap while the cap is fitted into the container mouth portion. By the process of adhering the back surface of the material to the container mouth, the metal foil such as aluminum foil, which is fixed to the container mouth and is present in the seal layer, does not adhere to the filler in the container. Has a moisture-proof effect.

In the inner seal material, the resealing layer and the seal layer are separated by the operation of removing the cap fitted in the container mouth, and only the seal layer remains adhered to the container mouth.

Incidentally, the separation between the reseal layer and the seal layer is performed by separating the reseal layer from the reseal layer and a seal layer having a surface layer made of a releasable resin layer having releasability with respect to the back surface of the reseal layer. Inner seal material by a laminated sheet adhered between the back surface and the surface of the seal layer, for example, FIGS.
As illustrated in the drawing, a reseal layer 24 in which a front surface layer 21 made of paperboard and a back surface layer 22 made of a polyolefin resin are laminated via a wax layer 23, and a back surface layer of the reseal layer 24.
In the case of an inner seal material 27 having a laminated structure with a seal layer 26 having a releasable resin layer 25 having a releasability with respect to 22, as a surface layer, a cap fitted to a container mouth 29.
The operation to remove 30 separates at the interface between the back surface of reseal layer 24 and the surface of seal layer 26.

That is, the peelable resin layer 25 is rotated by the rotation of the cap 30.
A sealing layer 26 composed of a metal foil 31 such as an aluminum foil and a glassine paper 28 forming a back surface layer remains in the container opening 29, but the reseal layer 24 is locked to the back surface of the cap 30. Will remain.

Furthermore, the reseal layer 24 that remains locked to the back surface of the cap 30 still functions as a cap packing even after the seal layer 26 is peeled from the container mouth portion 29 when the inner filler is taken out. Seal the filling inside.

Further, in the case of the inner seal material in which the back surface of the reseal layer and the surface of the seal layer are adhered by the wax layer, the reseal layer and the seal layer are separated by the destruction of the wax layer.

"Problems to be solved by the invention" By the way, in the conventional inner sealing material for sealing the mouth of a container, a resealing layer and a surface layer comprising a releasable resin layer having releasability from the back surface of the resealing layer are provided. The laminated sheet in which the seal layer provided is adhered between the back surface of the reseal layer and the front surface of the seal layer, the coating conditions of the releasable resin layer, for example, coating amount, coating omission, etc. Alternatively, the peel strength between the reseal layer and the seal layer varies depending on the conditions when forming the resin layer in contact with the releasable resin layer, which forms the back surface layer of the reseal layer, so that the peel strength is stable. It is difficult to obtain a product having the above-mentioned peelability.

Further, in the case of an inner seal material in which the back surface of the reseal layer and the surface of the seal layer are adhered by a wax layer, the inside of the wax layer may be changed depending on the conditions at the time of forming the wax layer, coating unevenness, and environmental temperature. Since the breaking strength varies, it is difficult to obtain a material having stable peelability.

On the other hand, according to the present invention, the peel strength at the time of separating the inner seal material adhered to the container opening portion into the reseal layer and the seal layer by the rotation of the cap is stable,
(EN) Provided is an inner seal material for sealing a container mouth with good quality, in which the peel strength between the reseal layer and the seal layer is constant.

"Means for Solving the Problem" The inner sealing material for sealing a container mouth portion according to the first aspect of the present invention separates between the back surface of the reseal layer and the surface of the seal layer, and the back surface of the reseal layer. The biaxially stretched polypropylene resin film having only one surface subjected to corona discharge treatment and the polyethylene resin laminated on both upper and lower sides of the biaxially stretched polypropylene resin film In the laminated constitution with the layer, it is formed between the corona discharge non-treated surface of the biaxially stretched polypropylene resin film and the polyethylene resin layer laminated on the corona discharge non-treated surface.

The inner sealing material for sealing the mouth of the container according to the second aspect of the present invention is the inner sealing material for sealing the mouth of the container according to the first aspect of the present invention, in which the back layer of the reseal layer is subjected to corona discharge treatment only on one surface. Is formed of a biaxially stretched polypropylene resin film layer.

The inner sealing material for sealing the container mouth of the third aspect of the invention is the same as the inner sealing material for sealing the mouth of the vessel of the first aspect of the invention, wherein the surface layer of the seal layer is corona discharge treated only on one side surface. It is formed of a biaxially oriented polypropylene resin film layer attached thereto.

Further, the inner sealing material for sealing the container mouth portion of the fourth invention is the inner sealing material for sealing the container mouth portion of the first, second, or third invention, wherein the back surface layer of the sealing layer is heat-bonded. And a metal foil is laminated in the seal layer.

The resealing layer in the inner sealing material for sealing the container mouth portion of each of the above inventions is formed mainly of paperboard, and is engaged with the inner surface of the back surface of the cap to provide a packing action to the cap. It is a thing.

In addition, the back surface of the sealing layer is adhered to the mouth of the container,
In order to retain moisture resistance against the filling material in the container, the back surface layer of the seal layer is formed of a heat-adhesive resin layer, and when a metal foil is laminated in the seal layer, Using the heat generated by the metal foil in the seal layer due to high-frequency induction heating and the heat-welding ability of the heat-welding resin layer that forms the back surface layer, the inner seal material and the container mouth can be bonded together. .

When the back surface layer of the seal layer and the metal foil are adjacent to each other, the heat-adhesive resin layer as the back surface layer is an acid-modified polyethylene resin having excellent adhesiveness to the metal foil, for example, ethylene. And a carboxylic acid-based monomer such as acrylic acid or methacrylic acid and ethyl (meth) acrylate, butyl (meth) acrylate, etc.
Original copolymer resin, ethylene-vinyl acetate copolymer resin,
Furthermore, the heat-adhesiveness of an acid-modified ethylene-based copolymer resin such as an ionomer resin, which is mainly composed of an acid-modified ethylene-based copolymer resin having a carboxyl group conversion amount of about 3 to 25 mol% It is preferably made of resin.

When the back surface layer of the seal layer is formed of a thermoadhesive resin layer, the stability of the resin layer itself and the heat between the inner seal material and the container mouth that are adhered by the high frequency induction heating method. From the viewpoint of stability of the adhesive portion, it is preferable that the thickness is formed to be about 20 to 100 μm.

Further, when the back layer of the seal layer is made of glassine paper, the inner seal material and the container mouth are adhered by gluing.

In the inner sealing material for sealing a container mouth of the present invention, a biaxially stretched polypropylene resin film used for an adhesive structure between the back surface of the resealing layer and the front surface of the sealing layer is
From the viewpoint of its stability, those having a thickness of about 20 to 50 μ are used, and the corona discharge treatment applied to one surface of the film improves the adhesion strength between the corona discharge treated surface and the polyethylene resin layer. It is preferable that the corona discharge treatment is performed so that the corona discharge treated surface is 35 dyne or more so that the value can be sufficiently measured.

[Advantage of the Invention] The inner sealing material for sealing the mouth of the container of each invention is a biaxially stretched material in which the back surface of the resealing layer and the front surface of the sealing layer are bonded to each other only on one surface by corona discharge treatment. In a laminated constitution of a polypropylene resin film and a polyethylene resin layer laminated on both upper and lower sides of the biaxially stretched polypropylene resin film, a corona discharge treated surface and a corona discharge treated surface of the biaxially stretched polypropylene resin film are formed. Since it is formed between the laminated polyethylene resin layer, the peeling strength when separating the inner seal material into the reseal layer and the seal layer by rotating the cap is stable, A constant peel strength is obtained between the seal layer and the seal layer.

The inner sealing material for sealing the container mouth portion of the fourth invention is such that the inner sealing material can be adhered to the container mouth portion by using a thermal bonding method by a high frequency induction heating method. Compared to other heat-bonding methods, there is no risk of degrading the contents due to local heat generation, and the high-frequency induction heating method, which has excellent characteristics in that the finish is quick, is used. Can be done.

[Examples] Hereinafter, a specific configuration of the inner sealing material for sealing the container mouth portion of the present invention will be described with reference to the drawings.

Example 1 In FIG. 1, after 30 μm-thick aluminum foil 2 and 50 μm-thick ionomer resin film [HM04c (Tamapoly)] 3 were bonded by dry lamination, a pattern printing pattern m was printed on the surface of the aluminum foil 2. Then, the anchor coat layer 4 was formed so as to cover the printed pattern m.

Subsequently, the corona discharge non-treated surface of the biaxially stretched polypropylene resin film 5 having a thickness of 20 μ, which is subjected to corona discharge treatment only on one side surface, and the anchor coat layer 4 surface,
A polyethylene resin extruded resin layer 6 having a thickness of 20 μ was laminated between the two.

The corona discharge treatment of the biaxially stretched polypropylene resin film 5 has a wetting index of the corona discharge treated surface.
It was carried out under the condition of 35 dyne or more.

Furthermore, subsequently, the corona discharge treated surface of the biaxially stretched polypropylene resin film 5 and the cardboard 7 having a basis weight of 230 g / m ² are interposed between the two by extruding a resin layer 8 of polyethylene resin having a thickness of 20 μ. By laminating, a molding material for an inner seal material for sealing the container mouth was obtained.

Subsequently, the molding material is punched into a disk shape having a diameter of 7.51 cm to form an inner sealing material for sealing the mouth of the container, which is one embodiment of the present invention and is indicated by reference numeral 1 in FIG. Got

In FIG. 1, the portion indicated by reference numeral 9 is the reseal layer of the inner seal material 1, and the reference numeral 10
The part indicated by is the seal layer.

The obtained inner seal material 1 is used as the inner seal material 1
The 7th side of the thick paper comes into contact with the inner surface of the cap and engages with the back side of the cap, and after fitting this into the mouth of the container, the magnetic field [anode voltage: 5KV, anode current: 0.55A, grid Current of 330 mA, sealing time: 15 seconds], and the inner seal material 1 was heat-bonded to the mouth of the container by the heat sealing method accompanying the heat generation of the aluminum foil 2 in the seal layer 10 of the inner seal material 1. .

After cooling, removing the cap from the container,
The inner seal material 1 is sealed by a normal operation.
The polyethylene resin layer 6 forming the surface layer of 10 and the biaxially stretched polypropylene resin film 5 forming the back layer of the reseal layer 9 were easily separated.

That is, the sealing layer 10 remains fixed at the mouth of the container to completely seal the inside of the container, and the back surface layer is formed of the biaxially stretched polypropylene resin film 5 on the inner peripheral surface of the cap. The reseal layer 9 was engaged and held as packing of the cap.

On the surface of the seal layer 10 that remained fixed to the mouth of the container, the brilliance of the metal due to the aluminum foil 2 in the seal layer 10 was beautifully exposed.

Example 2 In FIG. 4, after the picture print pattern m1 was applied to the surface of the glassine paper 42 having a basis weight of 30.5 g / m ² , the anchor coat layer 43 was formed so as to cover the picture print pattern m1.

Then, an aluminum foil 44 having a thickness of 10μ and the surface of the anchor coat layer 43 are laminated between the two via an extrusion resin layer 45 of a polyethylene resin having a thickness of 40μ, and further,
The printed pattern m2 and the anchor coat layer 46 were sequentially formed on the surface of the aluminum foil 44.

Subsequently, the corona discharge-untreated surface of the biaxially stretched polypropylene resin film 47 having a thickness of 20 μ whose only one surface is subjected to corona discharge treatment and the anchor coat layer 46 surface,
A polyethylene resin extruded resin layer 47 having a thickness of 20 μ was laminated between the both.

The corona discharge treatment conditions for the biaxially oriented polypropylene resin film 47 were such that the wetting index of the corona discharge treated surface was 35 dyne or more.

Further continuously, after forming an extrusion resin layer 49 of polyethylene resin having a thickness of 20 μ on the corona discharge treated surface of the biaxially stretched polypropylene resin film 47, the polyethylene resin layer 49 surface and a basis weight of 620 g / m ² are formed. The cardboard 50 was adhered with a wax layer 51 of 20 g / m ² to obtain a molding material for the inner sealing material for sealing the container mouth.

Then, the molding material is punched into a disk shape having a diameter of 7.51 cm to form an inner seal for sealing the mouth of the container, which is another embodiment of the present invention indicated by reference numeral 41 in FIG. I got the material.

In FIG. 4, a portion indicated by reference numeral 52 is a reseal layer of the inner seal material 41, and a reference numeral 53
The part indicated by is the seal layer.

The obtained inner seal material 41 is replaced with the inner seal material 41.
The 50 side of the thick paper is brought into contact with the inner peripheral surface side of the cap and engaged with the back surface of the cap, and while being fitted into the container mouth portion, it is adhered to the container mouth portion with starch-based glue. .

When the cap was removed from the container after the adhesive was completely dried and solidified, the inner seal material 41 was formed by a normal operation so that the polyethylene resin layer 48 forming the surface layer of the seal layer 53 and the reseal layer 51 were formed. It was easily separated from the biaxially oriented polypropylene resin film 47 forming the back layer.

That is, the seal layer 53 remains fixedly attached to the container mouth to completely seal the inside of the container, and the back surface layer is a biaxially stretched polypropylene resin film on the inner peripheral surface of the cap.
The reseal layer 52 formed of 47 was engaged and held as a packing of the cap.

In addition, on the surface of the seal layer 53 that remained fixed to the mouth portion of the container, the brilliance of the metal due to the aluminum foil 44 in the seal layer 53 was beautifully exposed.

[Advantages of the Invention] The inner sealing material for sealing the container mouth portion of the present invention is an inner sealing material for sealing the container mouth portion, which is separated between the back surface of the reseal layer and the surface of the seal layer, to seal the back surface of the reseal layer. Biaxially oriented polypropylene in a laminated structure in which a polyethylene resin layer is laminated on both lower and upper sides of a biaxially oriented polypropylene resin film having only one side surface subjected to corona discharge treatment for adhesion between layers. Since it is formed between the corona discharge non-treated surface of the resin film and the polyethylene resin layer laminated on the corona discharge non-treated, for example, a reseal layer and a seal layer based on nonuniformity of the coating layer, etc. There is no instability in peelability between them, and it becomes an inner seal material with stable quality.

In addition, the inner sealing material for sealing the mouth of the container according to the fourth aspect of the present invention is characterized by the presence of the metal foil in the sealing layer and the heat-welding characteristics achieved by the heat-adhesive resin layer which is the back layer of the sealing layer. Adhesion of the inner seal material to the container mouth does not change the contents due to local heat generation, and moreover,
It is performed using a high-frequency induction heating method that has a quick finish.

Therefore, when the cap is removed from the container in which the inner seal material is adhered to the container mouth and the seal layer adhered to the container mouth is removed, the peeling of the seal layer is complete, A part of the seal layer does not remain on the upper edge of the portion, and a clean state suitable for a container for food and drink such as coffee powder or cream powder can be obtained, for example.

[Brief description of drawings]

FIG. 1 is a model cross-sectional view showing an inner seal material for sealing the container mouth portion of the present invention as one embodiment product, and FIG. 2 is a model cross-sectional view of a conventional inner seal material for sealing the container mouth portion, FIG. 2 is a model cross-sectional view showing a state in which the cap is removed from the container in which the inner seal material of FIG. 2 is adhered to the container mouth, and FIG. 4 shows the inner seal material for sealing the container mouth of the present invention. It is a model cross section which shows another Example product. 1 ... Inner seal material for sealing container mouth, 2 ... Metal foil in seal layer, 3 ... Thermo-adhesive resin layer forming back surface layer in seal layer, 5 ... Only one surface is subjected to corona discharge treatment Biaxially oriented polypropylene resin film, 6
...... Polyethylene resin layer, 8 …… Polyethylene resin layer,
9 ... Reseal layer, 10 ... Seal layer.

Claims (4)

[Scope of utility model registration request] 1. An inner seal material for sealing a mouth of a container, which is separated between the rear surface of the reseal layer and the front surface of the seal layer,
Adhesion between the back surface of the reseal layer and the surface of the seal layer is such that a biaxially stretched polypropylene resin film having only one surface subjected to corona discharge treatment and laminated on both upper and lower sides of the biaxially stretched polypropylene resin film. And a polyethylene resin layer laminated on the corona discharge non-treated surface of the biaxially stretched polypropylene resin film in a laminated constitution with the polyethylene resin layer Inner seal material for sealing the mouth of a container. 2. The container mouth portion according to claim 1, wherein the backside layer of the reseal layer is formed of a biaxially stretched polypropylene resin film layer whose only one surface is subjected to corona discharge treatment. Inner seal material for sealing. 3. The container mouth portion according to claim 1, wherein the surface layer of the sealing layer is formed of a biaxially stretched polypropylene resin film layer whose one side surface is subjected to corona discharge treatment. Inner seal material for sealing. 4. A utility model registration claim in which the back surface layer of the seal layer is formed of a heat-adhesive resin layer, and a metal foil is laminated in the seal layer. The inner seal material for sealing the container mouth according to claim 3.