| 摘要 |
<p>PURPOSE:To enhance vacuum retentivity, shape retentivity and productivity and to reduce a cost. CONSTITUTION:Two molded forms obtained by vacuum molding plastic plates adhered with aluminum foils are adhered to form a vessel 5. A powder pouring inlet 2 and a discharge port 3 are provided a the vessel 5. Inorganic fine powder having low thermal conductivity is poured from the inlet 2 in a chamber 13, the port 2 is thermally melted, the air is evacuated through an evacuation adapter 7 mounted at a plastic discharge port 9 connected to the port 3, the port 9 is melted to be sealed when it becomes a predetermined pressure. Thus, rigidity of a vacuum heat insulating panel is increased to enhance vacuum retentivity, shape retentivity, and a simple structure is provided to enhance productivity and to reduce the cost.</p> |
