B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/663
B29C 67/20 (2006.01)
Patent
CA 1214910
ABSTRACT OF THE DISCLOSURE 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.
446174
Hayashi Motoshige
Ishikawa Mikio
Kobayashi Toshirou
Tsubone Masahiro
Yoshii Motokazu
Marks & Clerk
Sekisui Kaseihin Kogyo Kabushiki Kaisha
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