Method and apparatus for preparing multi-cellular foamed board of thermoplastic resin
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United States of America Patent
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-
Aug 20, 1985
Grant Date -
N/A
app pub date -
Jan 30, 1984
filing date -
Jan 28, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for preparing a multi-cellular foamed board of thermoplastic resin which comprises forming under pressure in a die a thermoplastic resin melt containing a foaming agent to give the resin melt a shape of a flat board having a broad width compared with a thickness thereof, extruding the resin melt from the die having the convex forward end with a middle portion in the width direction thereof protruding the greatest toward the extruding direction, introducing thus extruded resin melt immediately into a moulding passage having a concave end engaging with the said convex forward end of the die, allowing the resin melt to expand in the thickness direction at the portion adjacent to and extending along the concave end of the passage, and thereafter allowing the resin melt to expand in both the thickness and width directions of the board in the passage.
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