Method and apparatus for producing double-walled thermoplastic p

Details Method and apparatus for producing double-walled thermoplastic p Method and apparatus for producing double-walled thermoplastic p

1977-05-20

1978-08-22

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156285, 156290, 156293, 156294, 156500, 264286, 4251331, 425336, 425396, B29C 1500, B29D 2304

Patent

active

041087038

ABSTRACT:
A double-walled pipe of thermoplastic material is produced, constituted of an inner pipe and an outer pipe concentric therewith, in which the outer pipe is formed into the shape of a helical thread. The pipes are extruded, the outer over the inner, and prior to the setting of the outer pipe it is subjected to forming into a helical thread by a rotating mold. The mold includes vacuum forming rollers spaced along a helical path about the outer pipe, the circumferential edges of the rollers being spaced at different distances from the longitudinal axis of the pipes.

REFERENCES:
patent: 3327039 (1967-06-01), Ruckert et al.
patent: 3692889 (1972-09-01), Hetrich
patent: 3994644 (1976-11-01), Hegler et al.
patent: 3994646 (1976-11-01), Hauck

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