| 摘要 |
<p>PURPOSE:To eliminate an existence of unfilled part by a method wherein a vacuum heat insulative materail is mounted on an urethane foaming metal die, and hard urethane foam is filled and foamed without being influenced of 'fin' which injure fluidity by inserting a heat insulator unit which is foamed and molded into a rectangular board. CONSTITUTION:A container is formed, by heat sealing at three sides of laminate film which sandwiches an aluminium foil 3, between a PET film 1 having high gas barrier property and a PE 2 which is prominent in the heat sealingness. Fine powdery silica 4 is filled in this container and the inside of the container is vacuum exhausted, and the, an opening is heat sealed to form a vacuum heat insulative material 5. On the other hand, a rectangualr board-shaped foaming metal die 7 is formed which has a depth and a thickness of a box of an electric refrigerator as its length and thickness, and also a prescribed width. After the vacuum heat insulative materail 5 which is made a little smaller than the metal die 7 and has a 'fin' 6, a heat sealing margin, formed all over the periphery is inserted along a bottom surface of the metal die 7, hard urethane foam is poured in as a foaming agent.</p> |
