JPS60172799A - Manufacture of heat-insulating material pack - 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 Field of Industrial Application The present invention relates to a heat insulating material pack used as a heat insulating material for heat insulating boxes of refrigerators, freezers, showcases, etc.

Conventional configuration and its problems Figures 1 to 3 show conventional insulation packs.

The configuration of this conventional example will be explained below with reference to FIGS. 1 to 3.

In the figure, 1 is an insulating material pack and a breathable inner bag 2
A powder 3 such as foamed perlite is filled and sealed, and after sufficiently drying, the bag 4 is inserted into a bag 4 made of plastic-laminated film.Then, the bag is left in a vacuum chamber 5 and evacuated with a vacuum pump 6 to reach a predetermined pressure. At this point, the opening 8 of the bag 4 is thermally welded by the heat sealing machine 7 to form a thermally welded portion 9.Next, the operation of the above conventional example will be explained. In such a product, when the insulation pack 1 becomes large and the width of the opening 8 becomes long, the plastic laminate film bag 4
When the opening 8 of the weld is strongly curled, the curled opening 8 is folded over when heat welded by the heat sealing machine 7, causing wrinkles in the heat welding part e, which tends to cause a vacuum break due to poor welding. Ta. In addition, since the opening 8 is wavy due to curling, the powder 3 and the inner bag 4 absorb moisture when the pressure is reduced through the opening bottom 8, which has a wide opening area, and vacuum degassing is required to reduce the pressure to a predetermined pressure. I rarely encountered problems that took a long time.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional examples, and aims at stabilizing quality and improving productivity.

Structure of the Invention In order to achieve the above object, the present invention is to spot-weld the opening immediately after inserting the inner bag into the bag made of plastic laminate film, and then heat-weld the opening by vacuum degassing. This eliminates welding defects at the welded part and prevents moisture absorption from the time the inner bag is inserted to the time it is vacuum degassed, contributing to stable quality of the insulation pack.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be explained below with reference to FIGS. 4 to 6.
The explanation will be given with reference to the drawings, but the same components as those in the conventional art will be given the same reference numerals and detailed explanation thereof will be omitted. - In the figure, 10 is a spot heat welding part, where the opening 8 is partially heat welded immediately after inserting the inner bag 2 filled with sufficiently dried powder 3 such as foamed perlite into the plastic laminate film bag 4. It is. The spot heat welded portions 10 are formed at intervals of about 20 cm. After that, the vacuum chamber 5 is left still in the vacuum chamber 5, the interior of the vacuum chamber 5 is evacuated using the vacuum pump 6, and when a predetermined pressure is reached, the opening 8 of the plastic laminate film bag 4 is heated using the heat sealing machine 7. They are welded to form a thermally welded portion 11. At this time, the closer the heat welding part 11 is to the spot heat welding part 10, the more the effect of the spot heat welding part 1o is exhibited.

Next, the operation of the above embodiment will be explained.

Since the opening 8 is spot heat-welded immediately after inserting the inner bag 2 into the plastic laminate bag 4, the curling and waving of the opening 8 are reduced, and the opening area of the opening 8 is reduced. As a result, the amount of moisture absorbed by the inner bag 2 and the powder 3 through the opening 8 until vacuum degassing is reduced, and the vacuum degassing time is shortened. In addition, since curls are eliminated, when heat welding is performed after vacuum degassing, curls do not overlap and cause poor heat welding, and quality instability that can lead to vacuum breaks is eliminated.

Effects of the Invention The present invention has the above-described configuration, and the following effects can be obtained.

a) Immediately after inserting the inner bag into the plastic laminate film bag, the opening is spot heat welded, so spot heat welding makes the plastic laminate film bag stiff and eliminates curling and waving at the opening.

As a result, the opening area of the opening becomes smaller, and the moisture absorption of the powder and inner bag through the opening until vacuum degassing is reduced, reducing vacuum degassing time and contributing to stable productivity. It is.

b) Curling and waving at the opening are eliminated, so when heat welding is performed after vacuum degassing, curls will not overlap and cause welding defects, and vacuum breaks will not occur, resulting in stable quality. It contributes.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional insulation pack, Figures 2 and 2 are cross-sectional views of the inner bag inserted into a plastic laminate bag, Figure 3 is a cross-sectional view of the insulation bank during decompression, and Figure 4 is a cross-sectional view of the insulation bank during depressurization. The figure is a sectional view of a heat insulating material pack according to an embodiment of the present invention.
The figure is a sectional view of the insulation pack with the inner bag inserted into the plastic laminate bag and spot welded, and FIG. 6 is a sectional view of the insulation pack of FIG. 5 during depressurization. 2...Inner bag, 3...Powder, 4...
...Plastic laminated film bag, 8...
...Opening part, 1o... Spot heat welding part. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 (!I Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] Powder such as foamed perlite is filled into a breathable inner bag, sealed and dried, this inner bag is inserted into a plastic laminated film bag, and the opening of the bag is locally sealed by spot heat welding or the like. A method for manufacturing a heat insulating material pack that is sealed, then placed in a chamber to reduce pressure, and the opening is heat welded.