Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1984-11-29
1986-12-23
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264DIG15, 264DIG16, 264DIG18, 264101, C08J 922, C08J 324
Patent
active
046311599
ABSTRACT:
A method for aging an expansion-molded body of polyolefin prepared by heating pre-expanded polyolefin particles within a mold involves cooling the molded body within the mold so that the molded body is not substantially smaller than the volume of the mold cavity and is temporarily expandable after being removed from the mold to not more than 110% relative to the volume in the mold cavity, removing the molded body from the mold, placing the molded body in an atmosphere substantially under atmospheric pressure and having a temperature of 25.degree. to 55.degree. C. lower than the melting point of the polyolefin while the volume of the molded body is 70 to 110% relative to the volume of the mold cavity and holding the molded body in this atmosphere until the temperature of the molded body is at least equal to the temperature of the atmosphere.
REFERENCES:
patent: 3953558 (1976-04-01), Hatano et al.
patent: 4272468 (1981-06-01), Slocumb
patent: 4483809 (1984-11-01), Ando et al.
Whittington's Dictionary of Plastics, by Lloyd R. Whittington, Stamford, Conn., Technomic, c1968, Preface, pp. 7, 15, 59, 60.
Akamatsu Naruhiko
Maeda Hirofumi
Nishioka Shunichi
Senda Kenichi
Watanabe Kazuyoshi
Anderson Philip
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
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