Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1975-08-11
1978-01-31
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 455, 264 54, 264177R, 264DIG14, 264DIG18, B29D 2700
Patent
active
040715914
ABSTRACT:
A method for producing foamed thermoplastic resin profiles with an outer skin layer of increased hardness and an inner foam structure which may be used in place of wooden articles. The outer skin has a smooth surface and a good appearance, and the inner portion enclosed by the skin has a uniform foam structure. Also, with this method an improved foaming efficiency can be obtained. The method comprises a step of melting and kneading a mixture consisting of a thermoplastic resin and a foaming agent without causing the gasification of the foaming agent, a step of heating the melted and kneaded mixture obtained in the previous step to cause the gasification of the foaming agent without agitating the mixture and under a pressure sufficient to supress the substantial foaming of the mixture, thereby forming an expandable melted resin mixture containing microbubbles which are prevented from gathering and uniting, and a third step of causing the melted resin obtained in the previous step to expand while cooling the resin by leading the resin to a foaming die under low temperature and low pressure conditions.
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Hirayama Toshiharu
Kamiya Takeshi
Kezuka Seiju
Kobayashi Seizo
Takeuchi Hidesuke
Anderson Philip
Calvaruso Joseph A.
Casella Anthony J.
Nippon Petrochemicals Co. Ltd.
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