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AssigneeKanegafuchi Kagaku Kogyo Kabushiki Kaisha
InventorsKiyoshi Matsuki, Izumi Ibata
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A cellular molded article (11) of a polypropylene resin having a skin (8) was produced by placing a skin material (8) on the interior surface of a die A (13), clamping the die A (13) with a die B (14) to form a mold (7), then charging the mold (7) with pre-expanded particles of a polyethylene resin, pre-heating the pre-expanded particles using steam supplied through the vapor holes (4) of the die B (14) at a temperature lower than the temperature at which the pre-expanded particles are melt bonded together, then holding the pre-expanded particles in said steam, and next performing the main heating of the pre-expanded particles through the die B (14) at a temperature not less than the temperature at which the pre-expanded particles are melt bonded together. At the time of the main heating of the pre-expanded particles through the die B (14), the die A (13) may also be heated up as needed.
A method for producing a cellular molded article of a polypropylene resin having a skin, comprising placing a skin material in the interior of die A, clamping the die A with a die B to form a mold, and then charging the mold with pre-expanded particles of a polypropylene resin, and after supplying steam through vapor holes of the die B to pre-heat the pre-expanded particles at a temperature which is lower than the temperature at which the pre-expanded particles are melt bonded together, holding the pre-expanded particles in said steam, and next performing main heating of the pre-expanded particles through the die B at a temperature which is not less than the temperature at which the pre-expanded particles are melt bonded together.
Dependencies are inferred from the claim text.