JPS6088295A - Manufacture of vacuum heat-insulating material - 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 the Invention The present invention relates to a method for producing a vacuum heat insulating material for use in heat insulating boxes for refrigerators and showcase hotels.

Structure of the conventional example and its problems A method of manufacturing a vacuum heat insulating material of the conventional example will be explained with reference to FIG. 11 is filled with a filler 12 made of inorganic powder such as expanded perlite or silica gel, and is filled with a breathable inner bag 13 such as paper, and a non-ventilated material such as plastic or metal foil laminated film to house this inner bag 13. This is a vacuum insulation material consisting of a container 14.

Next, to explain the manufacturing method of this vacuum insulation material 11, in order to remove moisture contained in the filler material 12 in advance,
The filler 12 is dried in a drying oven or the like, and then the filler 12 is stored in a breathable inner bag 13, and the open end of the bag is adhered with adhesive, tape, etc. to form the powder filler 12. Further put it into the container 14, taking care not to leak it. Thereafter, the vacuum insulation material 11 was made by vacuum degassing and thermal welding of the open end surface of the container 14 using a vacuum packaging machine. However, with this method, during vacuum degassing, while the pressure inside the inner bag 13 is high, the vacuum degassing proceeds smoothly, but as the pressure decreases and the pressure decreases, the pressure difference between the inside and outside of the inner bag 13 increases. As the inner bag 13 becomes smaller, the coating side of the inner bag 13 itself acts as resistance during vacuum degassing, reducing the rate of pressure reduction inside the inner bag 13, and it takes time to obtain a high vacuum. Therefore, when productivity is taken into account, it is not possible to spend much time on vacuum degassing, and the vacuum degassing time has to be shortened, thereby sacrificing insulation performance. Furthermore, if this is avoided and the inner bag 13 is discontinued, the filler material 12 on top of the powder will fall during vacuum evacuation and fall into the container 14.
There was a problem that the adhesive would fly out/stick and adhere to the heat welded parts. Figure 4 shows the general relationship between degree of vacuum and thermal conductivity of vacuum insulation materials filled with inorganic powder such as 7gnesia and silica airgel.
Understand that in order to improve insulation performance (that is, reduce thermal conductivity), it is better to increase the degree of vacuum.
The degree of vacuum P is equal to the degree of vacuum P2, and 7 is 4' (if the degree of vacuum P2 is changed to the degree of vacuum P3, the degree of heat conduction becomes smaller). However, if a sufficiently high vacuum cannot be obtained inside, it is difficult to obtain a high-performance insulating material with low thermal conductivity.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional examples, and aims to provide a total heat insulating material with low thermal conductivity and high heat insulating performance.

Structure of the Invention In order to speed up the above-mentioned object, the present invention provides a vacuum insulation material in which the components and materials constituting the vacuum insulation material are placed in a sealed chamber in advance, and air and other non-condensable gases are excluded. 5. This method employs the method of manufacturing a vacuum insulation material within the sealed chamber described above, making it possible to easily obtain a vacuum insulation material with good insulation performance.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 is a closed chamber used for manufacturing the vacuum heat insulating material 8, and has a see-through window 2 through which the inside of the chamber 1 can be seen.
It consists of work gloves 3 made of thick airtight rubber and a door 4 for accessing equipment, an exhaust pulp 5 leading from the chamber 1 to an exhaust pump 6, and an opening used to return the inside of the chamber 1 to normal pressure. It is equipped with a valve 7.

Next, regarding the method for manufacturing the vacuum insulation material 8, the filler 9, which is made of inorganic powder such as perlite, which constitutes the vacuum insulation material 8 in advance. Heat-weldable non-ventilated container made of metal foil-plastic etc. 10. Although not shown in the figure, a heat sealing machine for thermally welding the open end of the container 1o is inserted into the chamber 1 through the access door 4. Next, close the release valve 7,
The exhaust pulp 6 is opened, the vacuum pump 6 is activated I7, and the chamber 1 is evacuated. When the inside of the chamber 1 reaches a predetermined degree of vacuum, the exhaust pulp 5 is closed, the hand is put into the work glove 3, and while observing the inside of the chatter bar 1 through the see-through window 2, the inside of the chamber 10 is 1)r (111 Insert the fan filling month 9 of .
The open end 10a of the container 1o is thermally welded and sealed using a heat sealing machine. Next, when 91 pieces of vacuum insulation material 8 are completed, the release valve 7 is gradually opened, and when the inside of the chamber 1 returns to normal pressure, the vacuum insulation material 8 is taken out through the access door 4.

In the vacuum insulation material 8 manufactured in this way, even if the filler material 9 is a powder, it can be filled into the container 10 by a powder filling machine or the like, and the IL can be filled into the container 10 during vacuum evacuation as in the conventional method. There is no scattering of powder, there is no need to fill a breathable inner bag in advance, and the container containing the filler 8 can be simplified.

The inside of the chamber 1 is vacuum depressurized and the filling material 9 is placed in the container 1o.
Since the filling material 12 is placed inside the container and the opening end of the container is heat-sealed, there is no need to receive the exhaust resistance of the container 1-3 itself, unlike when the filling material 12 is built into the container 13 and then evacuated. The vacuum heat insulating material 8 can be produced reliably in a short time, and the manufacturing process can be rationalized.

Effects of the Invention As in the method described above, the present invention provides a method in which an inorganic filler such as perlite, silica gel, or an organic filler such as plastic is provided in a closed chamber, and a heat-weldable non-ventilated filler is provided in the chamber. After removing air and other non-condensable gases from the container, the filling material is placed in the container and sealed to create a vacuum insulation effect. A vacuum heat insulating material can be easily and reliably produced without considering the exhaust resistance of the packaging container itself, which is required when the packaging container is filled with air and exhausted only from the open end of the packaging container. This also becomes a significant effect when the vacuum insulation material becomes large in size. Furthermore, even when the filler is in powder form, the vacuum heat insulating material can be produced without the need for an inner bag or the like as in the past.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a manufacturing apparatus for vacuum insulation material according to an embodiment of the present invention, FIG. FIG. 3 is a cross-sectional view of a conventional vacuum insulation material, and FIG. 4 is an operational diagram showing the degree of vacuum and insulation performance of inorganic powders such as silica gel and pearlite. 1... Sealed chamber, 6... Vacuum pump, 8... Vacuum insulation material, 9... Filling material, 10... Group a Foil - plastic film. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2, Figure 70, Figure 3, f.

Claims (1)

[Claims] After placing an inorganic filler such as perlite, silica gel, or an organic filler such as glasstic in a sealed chamber and a non-ventilated container that can be thermally welded, air or other non-condensable gases in the chamber are removed. A method for producing a vacuum heat insulating material, in which the light phase is removed and then stored in the container and sealed.