Pipe extrusion die with a cooled and vacuumed additional mandrel

Details Pipe extrusion die with a cooled and vacuumed additional mandrel Pipe extrusion die with a cooled and vacuumed additional mandrel

1988-03-16

1989-02-28

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

2642093, 26421113, 264565, 4251331, 4253261, 425388, 425467, B29C 4788

Patent

active

048080985

ABSTRACT:
An extrusion die, particularly for double-walled corrugated thermoplastic pipes, including an extrusion head, a nozzle, two concentric hollow mandrels carrying die lips and an additional cooled and vacuumed mandrel. The vacuum is maintained between the latter and the inner wall of the pipe to prevent retraction of the wall from the mandrel until the wall is set.

REFERENCES:
patent: 3907961 (1975-09-01), Carrow
patent: 3976414 (1976-08-01), Hegler et al.
patent: 4362488 (1982-12-01), Casals et al.
patent: 4365948 (1982-12-01), Chaplain
patent: 4462778 (1984-07-01), Calcagni
patent: 4500284 (1985-02-01), Lupke
patent: 4510013 (1985-04-01), Lupke et al.
patent: 4663107 (1987-05-01), Takada et al.
patent: 4721594 (1988-01-01), Jarvenkyla

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