Polypropylene resin cellular molded article having a skin and production method therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 7, 2000
Issued Date -
N/A
app pub date -
May 27, 1997
filing date -
Apr 23, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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 to 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.
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