Method and apparatus for preparing multi-cellular foamed board o

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding

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264177R, 264DIG5, 425461, 425817C, B29D 2700

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active

045363579

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.

REFERENCES:
patent: 3624192 (1971-11-01), McCoy et al.
patent: 3874981 (1975-04-01), Hayashi et al.
patent: 3897528 (1975-07-01), Suh
patent: 4071591 (1978-01-01), Kobayashi et al.
patent: 4217322 (1980-08-01), Sugano et al.

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