| 摘要 |
PURPOSE:To efficiently manufacture a comparatively thick plank-shaped heat insulating material with high heat insulating performance without using large facilities by a method wherein synthetic shrunk foam, which has a function to expand itself again when it is left in the air, is inserted in the hollow part of a frame body made of heat insulating material so as to be expanded again. CONSTITUTION:A synthetic resin shrunk foam piece is basically composed of styrene-acrylonitrile-based resin and contains expanding agent gas and has a capacity to restore itself nearly to the expanded state with the expansion ratio realized before shrinkage when it is left in the air. Small styrene- acrylonitrile-based resin shrunk foam pieces 3 are inserted in the hollow part 1 of a frame body 2, which is made of polystyrene low foam and in the interior or which the hollow part 1 with a square section is provided, so as to expand the small shrunk foam pieces again by allowing the air to flow in the hollow part through a small through-hole bored in order to manufacture a heat insulating material, which manifests high heat insulating performance.
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