JPS60183303A - Heat sealing method of cover to 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 of heat sealing a lid for a container such as a glass container.

Generally, glass containers used for hermetically packaging liquids or fluids such as jam, gicose, alcoholic beverages, and mayonnaise, and foods such as powdered materials have poor finishing accuracy at the edges, and Asperities with a height difference of about 0.4n+m are formed on the surface. For this reason, even if the mouth of the glass container is heat-sealed by covering the mouth of the glass container with a metal foil lid having a heat sealing material layer on the lower surface, there is a problem in that the mouth of the glass container cannot be reliably sealed.

Therefore, conventionally, for example, as shown in FIG. 4, an elastic body (24) made of rubber is attached to the lower surface of the heating press part IJ' (23), and a lid (22) is placed over the mouth (21) of the glass container (20). ) through the elastic body (24) with the heating pressing member (2
3), the elastic body (24) made of rubber has poor thermal conductivity, and therefore it is difficult to supply sufficient heat to the heat sealing material layer of the lid (22). could not. For this reason, the heating time is very long,
The drawback was that the efficiency of heat sealing work was low. In addition, in order to shorten the heating time, it is possible to raise the heating suppressing member (23) to a higher temperature.
The heat-resistant temperature of the hot water is usually 220 to 240'C, so if the heat suppression member (23) is heated to a higher temperature than this, the elastic body (23)
4) There was a resentment that it would cause damage.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a method for heat-sealing roses for containers such as glass containers, which can efficiently and reliably seal the opening of a container such as a glass container in a very short time. It is in.

In order to achieve the above-mentioned object, the present invention provides a method for heat-sealing a container made of gold foil having a layer of heat-sealing material on five sides by placing it on the mouth of a container. The gist is a method for thermally sealing a lid for a container, which is characterized by using a heated pressing member to which a thin plate is fixed.

In the above, aluminum foil is usually used as the metal foil constituting the lid, but it may be a metal foil of the same type. In the case of aluminum foil, its thickness is 20~1100f1
．． Preferably it is 40 to 60 μm. In addition, the heat sealing material layer provided on the five sides of the mask is made of polyethylene, ethylene-1!
It is composed of a thermo-NJ plastic synthetic resin such as a vinyl chloride copolymer, or a composition in which these resins are blended with other waxy compounds in a predetermined ratio.

Good argument.

On the other hand, the metal thin plate fixed to the soil surface of the heat suppression member needs to have good thermal conductivity and appropriate elasticity. As such a metal thin plate, it is preferable to use one made of copper, aluminum, lead, zinc, etc. The thickness of the metal thin plate is approximately 0.1-2.0 in IIl, preferably 0.3 in IIl.
There is ~0.8mn+te.

Further, the elastic body interposed between the metal shield plate and the heat suppression member is made of synthetic rubber or other elastic material,
The elastic body is arranged so as to correspond to the required part of the thin metal plate, that is, the part where the lid is pressed against the [l] of the container.

According to the method of the present invention, a thin metal plate with good thermal conductivity is fixed to the lower surface of the heat suppressing member, so that sufficient heat is supplied from the heat suppressing member to the heat sealing material layer of the lid through the thin metal plate. can do. This allows for high-speed sealing.
Good efficiency. Moreover, the irregularities on the surface of the circumferential edge of the container can be covered by the thin metal plate and elastic body that hold the swallow in place during heat sealing, deforming appropriately according to the irregularities.
The heat sealing material layer of the lid penetrates into the irregularities, and the lid can be reliably brought into close contact with the circumferential edge surface of the container, ensuring complete sealing of the container. Furthermore, since the metal thin plate has good thermal conductivity, there is no need to raise the temperature of the heating press member particularly high, which prevents damage to elastic bodies such as rubber, and reduces heating time. Coupled with the short length, the amount of energy such as electric power used is small, and therefore the operating cost is low, resulting in a very economical effect.

The present invention will be explained below with reference to the drawings.

1 and 2 show a specific example of an apparatus for carrying out the method of the invention.

In the figure, (1) is a heat sealing device, which is a heat sealing device with a built-in heater (not shown) at the lower end.
Member (2) has been removed and placed in place. (3) is heating press I
"An annular soil elastic body (4) made of rubber on the bottom surface of the member (2)
) is a thin copper metal plate fixed through an elastic body /I)
The portions of the thin metal plate (3) other than the portions that come into contact with are in direct contact with the heating pressing member (2). (5) is a metal support plate (3)
There are 4 rubber annular lower bullets placed on the lower side of the periphery, and the inner circumferential surface of these has a taper that tapers upward. (6) is heat-sealed. Equipment (1
) is an annular mounting member fixed to Poles 1 to (8) on the lower end periphery, and an inward protrusion (7) is attached to the inner periphery of the lower end.
is installed horizontally (), and this inward protrusion (7) connects the heating pressing member (2), the upper elastic body (4), the thin metal plate (3), and the lower elastic body (5). Being kept as a woman.

(10) is a glass container for sealing food such as jam, (11) is the opening of this container, (12) is a lid placed over the top of the opening (11), and this is made of aluminum foil (13). , and a heat sealing material layer (14) provided on the lower surface thereof.

In the above, the heating pressing member (2) of the heat sealing device (1)
A glass container (10) is placed at a predetermined position below the container, and its opening (11) k: M (12) is covered. Then, the heated pressing member (2) heated to the required temperature is lowered to press the :I (12) onto the upper surface of the peripheral edge of the opening (11) of the glass container (10) via the thin metal plate (3). (1
2) is pressed against the tapered inner circumferential surface of the lower elastic body (5) and the outer circumferential surface of the circumferential edge of the opening (11), and the lid (12) is heated to the opening (11) of the glass container (10). Seal it.

-7- In addition, in d3 above, the opening (1) of the glass container (10)
1) Although the case where the lid (2) is brought into close contact with the upper surface and the outer peripheral surface of the periphery is shown, the lid (12) is brought into close contact with the upper surface,
The container (10) may also be sealed. Also, glass containers (
When filling the lid (10) with the contents at a high temperature and performing heat sealing, the center part of the lid (12) will bulge upward during heat sealing, so a thin metal plate (3) is used to release the contents. It is desirable to make a hole in the center of the glass container (10) or provide a recess large enough to accommodate the bulge of the lid (12). Although described above, the method of the present invention is also applicable to other containers such as containers made of synthetic resin.

Next, this invention will be explained in detail.

Example Using the device (1) shown in Figures 1 and 2 above, 18- Then, the method of this invention was implemented.

First, place the glass container (
10) and place the aluminum foil lid (12) having a heat sealing material layer (14) on the bottom surface of the glass container (10).
11) Cover. Next, the heating pressing member (2) preheated to 240° C. is lowered to press the copper thin metal plate (3) and the inner peripheral surface of the lower elastic body (5) against the lid (12) (J, 2).
By applying pressure and heating for seconds, Iff (12) was brought into close contact with the upper surface and outer peripheral surface of the periphery of the mouth (11) of the glass container (10), and the mouth (11) of the glass container (10) was heat-sealed. Then, the temperature sensor (
(not shown) was used to measure the temperature change of the upper surface portion (sealed portion) of the periphery of the mouth (11) of the glass container (10) during heat sealing, and the obtained results are shown in FIG.

For comparison, we used the apparatus shown in Figure 4 to heat-seal a lid on a glass container using the conventional method, and similarly measured the temperature change at the sealed portion. The results are shown in Figure 3! It was shown in

In the above Examples and Comparative Examples, heat sealing was performed i) when the glass container was empty and when it was filled with water.

As is clear from the graph in FIG. 3, according to the method of the present invention, the glass container (10) is empty (a) and the platform is filled with water (b). Also, the heat-sealing humidity was higher than when the glass container was empty (c) and when it was filled with water (d) in the conventional method.

Furthermore, when the peel strength of W(12) after heat sealing was measured, the results shown in the table below were obtained. In addition, the measured value is 3
The average of multiple measurements is shown.

11- As is clear from this table, according to the method of this invention:
Compared to the conventional method, the peel strength 12- of the lid (12) is greater, and therefore the sealing performance is very excellent.

Next, the water-filled glass container (10) that was heat-sealed by the method of the present invention was inverted and left at room temperature for one month. Results were obtained, and no deterioration in sealing performance was observed.

[Brief explanation of the drawing]

Fig. 1 is a partial enlarged sectional view showing a specific example of a heat sealing device for carrying out the method of the present invention, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 is a seal portion during heat sealing. FIG. 4 is a partially enlarged cross-sectional view of a heat sealing device that implements the conventional method. (1)... Heat sealing device, (2)... Heat pressing member,
(3)...Metal thin plate, (4)(5)...Elastic body,
13- (6)... Mounting member, (7)... Inner protrusion, (10
)...Glass container, (11)...Opening, (12)...
- Lid, (13)...metal foil, (14)...heat sealing material layer. 2 Patent Applicants: Showa Aluminum Kumu Co., Ltd. and 4 others -14- -1 Ward 9

Claims (1)

[Claims] Place a heat sealing material layer on the bottom surface (14) and metal foil bars (12) on the right side.
) is placed over the mouth (11) of the container (10) and heat-sealed, using a heating pressing member (2) to which a thin metal plate (3) is fixed to the lower surface via an elastic body (4). ,
A method of heat sealing a lid on a container.