Process of cross-linking and extrusion molding thermoplastic pol

Details Process of cross-linking and extrusion molding thermoplastic pol Process of cross-linking and extrusion molding thermoplastic pol

1975-10-22

1978-05-16

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling fluid pressure in direct contact with molding...

264 406, 264176R, 264236, B29C 2500

Patent

active

040899179

ABSTRACT:
Moldings of cross-linked thermoplastic polymers are obtained by the method comprising: melting a cross-linkable thermoplastic polymer admixed with a cross-linking agent by applying a temperature and a pressure insufficient to cause a cross-linking reaction; passing the thus-melted molding material through a first orifice thereby to raise its temperature by a shearing action to an extent that will start a cross-linking reaction; passing the thus-treated melted molding material through a second orifice thereby further to raise its temperature to an extent that will effect a rapid cross-linking reaction of the molding material; and then introducing the thus-treated molding material into a pre-forming die to advance the cross-linking reaction of the molding material and then cooling the molding material by means of a liquid under an elevated pressure.

REFERENCES:
patent: 2478013 (1949-08-01), Roddy
patent: 3480997 (1969-12-01), List
patent: 3546326 (1970-12-01), Seifert et al.
patent: 3737506 (1973-06-01), Martin et al.
patent: 3758658 (1973-09-01), Riggert
patent: 3876736 (1975-04-01), Takiura
patent: 3928525 (1975-12-01), Fuwa et al.

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