JPS60193866A - Method of 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 a glass container. Conventionally, as a method for sealing a glass container, when sealing a liquid, a crown,
Lip caps, screw caps, etc. are used, and when sealing powder, inner seals (hot melt, high frequency seals), etc. are used. However, these sealing methods require high material costs and slow line speeds, so heat sealing has been used as an alternative sealing method.

When sealing a glass container using the heat seal method, a moldable laminated film such as lt
Foil/sealant film (polyethylene etc.) etc. are used. Regarding the unsealability (ease of opening) when such a lid material is used to seal a glass container, the following points are required.

(1) A,! The interlaminar strength between the foil (usually about 40 to 50 microns thick) and the sealant film is suitably strong, and delamination between the At foil and sealant film does not occur when the sealant film is opened.

(2) The adhesive strength between the glass container and the sealant film is strong enough that the contents do not leak and peeling does not occur during transportation and sales, but weak enough that the sealant film exhibits appropriate ease of opening when opened. .

However, with the conventional heat sealing method, it has been difficult to fully satisfy the above requirements. For example, a glass container
When heat sealing a laminated film using thermoplastic resin such as polyolefin as a sealant film 1.
In order to increase the adhesive strength between the glass container and the sealant film, the portion of the glass container to be sealed may be coated with a silane cassilling agent. But then,
The adhesive strength between the glass container and the sealant film became very strong, making it very difficult to open the seal, or even exceeding the lamination strength between the At foil and the sealant film. The glass container and the sealant film do not peel off when the package is opened.
Peeling between the sealant films between the eyebrows occurs.

The present invention was made under these circumstances, and it is an object of the present invention to provide a method for sealing a glass container that exhibits good sealing performance and appropriate unsealability without causing delamination of the laminated film. purpose.

The glass container sealing method of the present invention that achieves this objective includes:
A silane coupling agent is applied to the heat sealing part of the glass container, the applied silane coupling agent is heat treated, and then the glass container is covered with a lid material made of a laminated film containing a thermoplastic resin layer as a sealant film. In the method for sealing a glass container by heat sealing, the conditions for the heat treatment and the type of thermoplastic resin are selected so that heat sealing is performed reliably and opening is performed easily. do.

The heat treatment conditions may be such that a portion of the applied silane cassilling agent is thermally decomposed. Such conditions include 1 at a temperature of 150 to 250°C.
A time of ~30 minutes is reasonable. In other words, heating under such conditions causes the functional groups of the silane cassilling agent to decompose to an appropriate degree, suppressing the adhesive strength between the glass container and the sealant film to below a certain value, and thus preventing delamination of the laminated film. The package can be opened easily without causing any damage.

The laminated film used in the present invention may be any film as long as it has a thermoplastic resin layer as a sealant film. For example, there is a laminated film of At foil and polyolefin film.

The silane cassilling agent used in the present invention has the general formula X3SIY [wherein, X is C1-, RO-].

or RCOO−, Y is +CH2)3NH(CH2
)2NH2°. ]. Specifically, acetoxysilane, aminosilane, vinylsilane, etc. are used in the form of a solution, usually in ethanol or the like.

Hereinafter, the present invention will be explained in more detail by showing examples of the present invention.

Example f The heat-sealed part of the raspin was coated with a 5% ethanol solution of a silane cassilling agent, heated in an open air condition for 10 minutes, and then heated at 250° using a heat seal.
The lid material was heat-sealed for 1 second at a temperature of 3K and a pressure of 17 cm2, and the adhesive strength of the sealed portion 15 was measured. The material of the glass bottle is MI-150 (manufactured by Daiichi Glass), and the silane cassilling agent is X12-560.
(Mixture of aminosilane and vinylsilane, Shin-Etsu Chemical Exhibition)
As the lid material, soft At foil (thickness 50 μm)/Himijin 1 F02 (thickness 50 μm 1 manufactured by Mitsui Polychemicals) was used.
A laminated film was used. The strength measurement results obtained when the heating temperature was varied are as follows.

(a) Interlayer strength between At foil/HIMILAN 17022.
0 to 2.5 Vl 5 (measured at 180°C peeling, 100 g/min tensile speed) (b) Adhesive strength between glass bottle/Hygraph 1702 As the heating temperature of the silane coupling agent (X12-560) increases , showed different values. From the attached drawings, it can be seen that the adhesive strength between the glass pin and the sealant (Himic 1702) reaches its maximum when the heating temperature is 80-120°C, that is, it reaches 5 to 9/15 crrL, and the adhesive strength between the At foil and the sealant (Himic 1702 ) glabella strength 2.0-2.5Kf
It can be seen that the value far exceeds /15c1n.

Considering the above results, next we
After applying a 5% ethanol solution of a silane coupling agent (X12-560, Shin-Etsu Chemical Exhibition Co., Ltd.) to the heat-sealed part of the glass (No. 100M of sake was hot-filled and heat-sealed with a laminated film (At foil = 50 μm/Himilan 1702: 50 μm) at 250° C. for 1 second at a pressure of 3 Kg/cm 2 . After that, glass pin and sealant film (Himitsuku 1702)
When we measured the adhesive strength with
It was determined that the package had been opened, but it was easy to seal it. At that time, no delamination occurred between the At foil/HIMILAN 1702.

In addition, the glabella strength of At foil/Himilan 1702 is 2 to 2.
．． 5 x 9715 mm, and the adhesive strength between the glass pin and the sealant film (HIMIC 1702) is about the same, but the reason why no peeling occurs between the eyebrows when opening the package is because
This is because in order for glabella peeling to occur, the sealant film must be cut before peeling begins, and a force of 4 to 5 kg or more is required at the initial stage of delamination.

Therefore, when considering sealability, unsealability, prevention of delamination, content resistance strength, etc., it is clear that the adhesive strength between the glass container and the sealant film should be 1 to 4 kg/15 mm. The heating temperature required for this purpose is about 170 to 220°C, as seen from the graph in the accompanying drawing. Note that this temperature range is a value for a heating time of 10 minutes, and can be changed by changing the heating time. That is, appropriate heating conditions in the method of the present invention are a heating temperature of 150 to 250° C. for a heating time of 1 to 30 minutes.

As explained above, according to the glass container sealing method of the present invention, by appropriately selecting the heating conditions for the silane cassilling agent applied to the heat-sealed portion of the glass container, the glass container and the sealant film can be sealed. As a result, a heat seal that can be easily opened can be obtained without causing delamination of the laminated film.

[Brief explanation of drawings]

The drawing is a graph showing the relationship between the heating temperature of a silane coupling agent applied to a glass container and the adhesive strength between the glass container and the sealant film.

Claims (4)

[Claims] (1) A silane coupling agent is applied to the heat-sealed part of the glass container, the applied silane coupling agent is heat-treated, and then a lid material made of a laminated film containing a thermoplastic resin layer is used as a sealant film. In a method for sealing a glass container, which involves heat-sealing a glass container, the conditions for the heat treatment and the type of thermoplastic resin should be selected so that heat sealing can be performed reliably and opening can be performed easily. A method of sealing a glass container characterized by: (2) The method according to claim 1, wherein the heating conditions are such that a part of the applied silane coupling agent is thermally decomposed. (3) The heat treatment conditions are 150 to 250°C and 1 to 3
The method according to claim 2, wherein the heating is performed for 0 minutes. (4) The method according to claim 1, wherein the thermoplastic resin layer is a polyolefin film.