Process for producing hollow moldings

Details Process for producing hollow moldings Process for producing hollow moldings

1991-02-26

1992-05-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Of varying cross-sectional area or with intermittent...

26417716, 2642092, 2642098, 425381, 425465, B29C 4722

Patent

active

051105292

ABSTRACT:
A process for continuously producing an irregular shaped hollow molding includes the steps of extruding a molding material from a molding opening to form the first portion of the hollow molding, and continuously passing the molding material extruded from the molding opening through a molding clearance or molding opening to form the second portion of the hollow molding after the desired length of first portion is obtained. One of the forming steps of the first and second portions includes a step for discharging an excessive molding material.

REFERENCES:
patent: 4281978 (1981-08-01), Shigematsu
patent: 4313327 (1982-02-01), O'Connor
patent: 4531326 (1985-07-01), Ballocca et al.
patent: 4765936 (1988-08-01), Ballocca
patent: 4960375 (1990-10-01), Saito et al.

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