JPH0442594B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulating pack that can be used as a heat insulating material for refrigerators, etc., and a method for manufacturing the same.

Configuration of the conventional example and its problems The configuration of the conventional example will be explained with reference to FIGS. 4 and 5. 1 is a heat insulating material pack, 2 is an inorganic powder such as perlite, and an inner bag 3 is made of breathable paper, etc.
and an outer bag 5 made of a plastic laminate film 4. Reference numeral 6 is composed of a vacuum chamber 7 and a vacuum pump 8, which are separated into upper and lower parts by a vacuum packaging machine, and a heat sealing machine 9 is provided inside the vacuum chamber 7. The inner bag 3 is smaller than the outer bag 5, and when the inner bag 3 is stored in the outer bag 5, exhaust passages 10 are formed in the front, rear, left and right directions.

The manufacturing process of the heat insulating material pack 1 having such a conventional structure will be explained. First, dried inorganic powder 2 such as perlite is placed in a dry inner bag 3 whose three sides have been heat-sealed in advance, and the opening side is sealed by heat-sealing. Next, it is simply flattened and inserted into the outer bag 5, which is also heat-sealed on three sides.

Next, put it in the vacuum chamber 7, close the lid, and use the vacuum pump 8 to exhaust the air inside the vacuum chamber 7 to reduce the pressure, so that the inside of the vacuum chamber 7 is approximately 10 ^-1 Torr.
Do the following. Then, the opening side 11 of the outer bag 6 located on the heat sealing machine 9 is heat sealed by the heat sealing machine 9. Then, the inside of the vacuum chamber 7 is returned to atmospheric pressure, and the heat insulating material pack 1 is formed and taken out.

However, in the above conventional example, the inner bag 3
This requires a lot of man-hours, and the inner bag 2 is filled with dried inorganic powder 2 such as perlite.
The inorganic powder 2 absorbs moisture during the operation of sealing the opening of the inner bag 3 by heat sealing and then inserting the inner bag 3 into the outer bag 5, and as a result, it takes a long time to reach a high vacuum. Moreover, it was difficult to manufacture as a whole.

Further, in the above conventional example, in order to sufficiently exhaust the inside of the inner bag 3, an exhaust passage 1 is provided between the outer bag 5 and the inner bag 3.
It is necessary to form 0's in front, back, left and right. In other words, it is necessary to make the outer bag 5 larger than necessary, which not only wastes material but also reduces the size of the insulation pack 1.
The outer peripheral ear 12 of the container became large and became difficult to handle. Furthermore, when foamed together with the urethane foam heat insulating material, the outer circumference selvage 12 obstructs the flow of the urethane foam heat insulating material, creating a cavity and causing a reduction in heat insulation performance.

Purpose of the Invention The present invention aims to eliminate the drawbacks of the above-mentioned conventional examples, and reduces the number of work steps, enables appropriate evacuation, shortens the evacuation time, and reduces the outer circumference of the insulation pack. purpose.

Composition of the Invention In order to achieve the above object, the present invention provides a plastic container formed by vacuum forming or the like, an inorganic powder filled in the plastic container, and a seal that covers the powder and seals the periphery of the opening of the plastic container. Fill the plastic container with the inorganic powder, cover the opening with a filter made of breathable nonwoven fabric, etc. to reduce the pressure, and then remove the laminate after the pressure reduction is completed. Since this is a method of manufacturing a heat insulating material pack that is sealed with a film, the inorganic powder can be directly filled into the plastic container, eliminating the need for an inner bag and reducing the number of work steps. In addition, moisture absorption of the powder can be prevented, and since the opening of the plastic container is properly evacuated, the evacuation time can be shortened, and the outer rim of the outer bag can be made smaller, making it easier to manufacture vacuum insulation packs. It is something.

DESCRIPTION OF EMBODIMENTS Figures 1 to 3 below describe one embodiment of this description.
The explanation will be made with reference to the drawings, but structures that are the same as the conventional ones will be given the same numbers and the explanation will be omitted.

In the figure, 13 is a ventilated plastic container formed by vacuum forming or the like, with an opening 1
4 has an outer peripheral ear 15. Reference numeral 16 denotes a heat insulating material pack, which is formed by filling the plastic container 13 with dried inorganic powder 2 such as perlite.

Next, the manufacturing process of this heat insulating material pack 16 will be explained. Dried inorganic powder 2 such as perlite is filled into the container 13 formed by vacuum forming or the like. Thereafter, a filter 17 made of nonwoven fabric or the like having breathability and heat sealability is adhered to the outer peripheral ear 15 by heat sealing so as to cover the opening 14 of the container 13.

Then, the pressure is reduced within the vacuum packaging machine 20 via a filter 17.

Next, a heat sealing machine 18 capable of heat sealing the shape of the outer peripheral ear 15 of the container 13 is provided.
The plastic container 13 is placed in a vacuum packaging machine 20 which has a cutter 19 capable of cutting the plastic laminate film 4 to the size of the outer peripheral edge 15 and the plastic laminate film 4, and the pressure inside the vacuum packaging machine 20 is reduced to 0.1 Torr or less. Thereafter, the plastic laminate film 4 is heat-sealed to the outer peripheral edge 15 using a heat-sealing machine 18 so as to cover the filter 17. Then, the cutter 19 cuts the plastic laminate film 4 to the size of the outer peripheral edge 15 of the plastic container 13 to form the vacuum insulation pack 16.

Therefore, the inner bag 3, which was conventionally indispensable to prevent the inorganic powder 2 such as pearlite from scattering outside the outer bag 5 during vacuum suction, can be omitted, and the number of work steps can be significantly reduced. . In addition, since the inorganic powder 2 such as dried pearlite can be directly filled into the container 13, the time that the inorganic powder 2 is in contact with the outside air is shortened, and moisture absorption of the inorganic powder 2 can be prevented. Since exhaust can be performed from the entire opening 14, the time required to reach a high vacuum of 0.1 Torr or less can be shortened and work efficiency can be improved.

Further, the outer circumferential ear 15 of the opening 14 of the container 13 is for heat-sealing the filter 17 and the plastic laminate film 4, and the outer bag 5 is enlarged for the exhaust passage 11 as in the conventional example. Since the outer peripheral ear 12 does not become large, the outer peripheral ear 15 of the opening 14 of the container 13 can be made small.

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

(a) Fill a container with inorganic powder such as perlite,
Conventionally, the opening of the plastic container is covered with a breathable filter such as a nonwoven fabric, and the inside of the container is evacuated through the filter to prevent the inorganic powder from scattering, and then the opening is heat-sealed. It is possible to omit the inner bag, which was previously used, and the number of work steps can be reduced.

(b) Since the dry inorganic powder can be directly filled into the container, the time that the inorganic powder is in contact with the outside air is shortened, and moisture absorption of the powder can be prevented. Also, since the entire opening of the container can be evacuated, vacuum The pulling time can be shortened and work efficiency can be improved.

(c) The outer rim of the container can be made smaller because it is used to heat seal the filter and the plastic laminate film that covers it.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a vacuum insulation pack according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of a container during powder filling, and Fig. 3 is a longitudinal sectional view of a vacuum packaging machine during evacuation. FIG. 4 is a longitudinal sectional view of a conventional vacuum insulation material pack, and FIG. 5 is a longitudinal sectional view of the conventional vacuum insulation material pack being evacuated by a vacuum packaging machine. 2...Powder, 3...Inner bag, 11...Exhaust passage,
12...Outer edge of outer bag, 13...Plastic container, 15...Outer edge of plastic container, 16...
...Vacuum insulation pack, 17...Filter.

Claims (1)

[Claims] 1. A container and an inorganic powder filled in the container,
A heat insulating material pack consisting of a filter such as a breathable non-woven fabric that covers the powder and is sealed around the opening of the melter, and a film that covers the filter and is sealed around the opening of the melter, and has a reduced pressure inside. 2. A step of filling the powder through the opening of the container, a step of covering the powder and adhering a filter such as a breathable non-woven fabric to the periphery of the opening of the container, and a step of drawing a vacuum through the opening. A method for producing a heat insulating material pack, comprising the step of applying a film to cover the filter after vacuuming.