JPS60183304A - Method of hermetically sealing glass vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for sealing the mouth of a glass container.

BACKGROUND ART Conventionally, a method is known in which a glass film is used as a lid material at the mouth of a glass container and is adhered by heat sealing (thermal fusion). In this case, it is known that a film of resin that has adhesive properties to glass, such as ionomer, ethylene vinyl acetate copolymer, or modified polyolefin, is heat-sealed directly to the mouth of the glass container, but the adhesive strength is insufficient. However, there is a problem in terms of sealing performance, and therefore, the general method is to apply a silane cassilling agent to the glass side in advance, heat it, and then heat seal the adhesive film as described above. It is being

However, when the above-mentioned adhesive film was heat-sealed with a 7-run cut-off ring agent interposed, there was a problem in that the adhesive film and the opening of the glass container became too strongly bonded, making it difficult to open the container. .

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for sealing a glass container, which has good sealing performance at the mouth of the glass container and is easy to open. That is, the present invention provides a multilayer film in which a silane cassilling agent is applied to the mouth of a glass container to be sealed, and then heat-treated to increase the adhesive strength of the cassilling agent, and then a thermoplastic resin layer is applied as the lower layer. The present invention provides a method for sealing a glass container, which comprises: heat-sealing the opening of the container with a lid made of the same.

There are no particular limitations on the silane cassilling agent used in the present invention (any conventionally known silane cassilling agent may be used as appropriate; It is preferable to select one of several types. For example, when the thermoplastic resin layer is made of polyethylene, polypropylene, or crosslinked polyethylene, vinylsilane or methacryloxysilane is preferable, and when the thermoplastic resin layer is made of polyvinyl chloride or nylon, it is preferable to use aminosilane.

The multilayer film used as the lid in the present invention may have two or more layers with a thermoplastic resin layer as the bottom layer, but a three-layer film as shown in FIG. 1 is particularly preferred.

That is, the first layer 10 is made of a material with good moldability and tear resistance when unsealed, such as aluminum foil (for example, 40 to 50 μm thick) or a glasstic film with comparable tear strength. .

The second layer 11 is made of a material that does not stretch when opened and has a higher adhesive strength with the first layer 10 than with the third layer 12, such as a stretched film of thermoplastic plastic such as polyester or nylon. is good. The thickness of this second layer 1 is generally desirably about 10 to 30 μm.

The third layer 12 is a layer that is heat-sealed to the silane coupling agent, and is made of a material that has good adhesion to the silane coupling agent, such as polyolefin, crosslinked polyolefin, polyvinyl chloride, nylon, etc. as described above. be able to. The thickness of this third layer 12 may normally be about 10 to 60 μm.

The conditions for applying the silane coupling agent and heat treatment are as long as the silane coupling agent is applied to the extent that a thin film is formed on the sealing surface of the mouth of the glass container, and usually 5% of the silane coupling agent is applied in a solvent such as ethanol. The silane cassilling agent may be diluted to a certain degree, applied, and then heat treated at a temperature such that the silane cassilling agent is thermally decomposed, for example, room temperature to about 200°C, more preferably 50 to 150°C, for about 1 minute. .

Example 2000C for one cup of sake is a raspin with a silane coupling agent (X12-560, trade name, (vinylsilane:aminosilane = 1 mixture)), Shin-Etsu Chemical Co., Ltd.
A 5% solution (solvent: ethanol) of M.D. Co., Ltd.) was applied thinly with gauze, and then heated at 110° C. for 10 minutes.

On the other hand, overprint varnish/Atf/3 (40μm thickness)
(First layer 10) / Polyethylene terephthalate stretched film (16 μm thick) (Second layer 1)) / Ionomer (Hisilane H1702, trade name, manufactured by Mikata Polychemical Co., Ltd.)
(50 μm thick) (3rd layer 5-12) was formed to correspond to the reduced pressure inside the container when cooling after heating and filling sake, and then Punch out the character f1 in the shape corresponding to the mouth. ? I got it.

Next, as shown in FIG. 2, the glass bottle 14 is filled with 180 ml of sake at 65°C, and the cap is placed on the mouth part 15 of the bottle at 250°C through the silane cassilling agent layer 16.
, 1 second, 3 kg Atn2 Tehito sealing was performed.

Next, after this heat sealing, the Laspin 14 was left in cooling water for a week and after confirming that there was no leakage,
When the package was opened, one layer of ionomer was found, as shown in Figure 3.
The package could be opened with only the heat-sealed portion of the second layer peeled off from the second layer 1 remaining at the opening 15 of the glass bottle. The initial peel strength upon opening is approximately 2 kg.
It was about 800g after the initial stage.

In the above example, a glass bottle was sealed and opened under the same conditions except that a multilayer film without the second polyethylene terephthalate layer 6-1 was used. The package was able to be opened by peeling between the two.

As detailed above, according to the present invention, since a multilayer film including a thermoplastic resin layer is used as the lid, the lid can be firmly adhered to the mouth of the glass container via a silane coupling agent. In addition, when the lid is opened, the lid can be easily and cleanly peeled off due to the interlayer peeling of the multilayer film that constitutes the lid.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the multilayer film for lid used in the present invention, FIG. 2 is a sectional view showing the lid heat-sealed to a glass container, and FIG. It is a sectional view showing a state when a cover body is peeled off from a thing. In the figure, 10...1st layer, 1no...2nd M, 12...
・Third layer, 14... Glass bottle, 15... Mouth, 1
6... Silane coupling layer. 7- Figure 1) 2 Meat 2 Figure b ■3 Figure 17-

Claims (3)

[Claims] (1) Consisting of a multilayer film in which a silane cassilling agent is applied to the mouth of a glass container to be sealed, then heat treated to increase the adhesive strength of the cassilling agent, and then a thermoplastic resin layer is applied as the lower layer. A method for sealing a glass container, comprising heat sealing the opening with a lid. (2) The method according to claim 1, wherein the multilayer film is composed of three layers, and the intermediate layer is a stretched film of thermoplastic resin. (3) The method according to claim 1, wherein the multilayer film consists of three layers, the upper layer being aluminum foil.