Process for the preparation of injection molded-stretch formed t

Details Process for the preparation of injection molded-stretch formed t Process for the preparation of injection molded-stretch formed t

1983-08-25

1986-03-18

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264325, 2643287, 425547, 425393, B30B 700, B29C 4557, B29C 5710

Patent

active

045767750

ABSTRACT:
Disclosed is a process for the production of a shaped article from a thermoplastic resinous material, comprising the steps of heat plastifying the thermoplastic material; injecting the heat-plastified plastic material into a forming tool having a first shape configuration and at least one parting plane, to form a pre-form of the thermoplastic material; subjecting the thermoplastic material pre-form in the forming tool to a cooling phase; providing at least a partially new second shape configuration to the forming tool containing the pre-form; and during the cooling phase subjecting the pre-form in the forming tool having the second shape configuration to at least one pressure treatment under elevated pressure to produce a shaped article. Also disclosed are several embodiments of apparatus for carrying out the process.

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Kaufer, H. and A. Burr, "Comparison Between Transfer-Injection Stretch Moulded and Injection Moulded Pom Gear Wheels", German Plastics, translated from and in Kunststoffe, 73 (1983), 11, pp. 684-689.

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