Apparatus for molding plastic pipe with enlarged portions formed

Details Apparatus for molding plastic pipe with enlarged portions formed Apparatus for molding plastic pipe with enlarged portions formed

1975-06-13

1977-01-18

Baldwin, Robert D.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

425326B, 425DIG206, B29D 2303

Patent

active

040036855

ABSTRACT:
Apparatus for molding a plastic pipe having spaced apart enlarged sleeve portions formed therein along its length and wherein a tube of hot plastic material is continuously extruded into a blow molding zone formed by a series of cooperating pairs of forwardly moving die blocks having concave inner surfaces defining a body-forming mold cavity and an adjacent enlarged sleeve-forming mold cavity of internal dimension greater than that of the body-forming mold cavity, and wherein internal fluid pressure is applied within the hot plastic tube during forward movement of the same through the blow molding zone to expand the tube and mold the same against the body-forming and enlarged sleeve-forming mold cavities to thereby form the tube into body portions of predetermined tubular dimension and adjacent relatively enlarged sleeve portions. To avoid blowing holes in the hot plastic tube as the tube is expanded and stretched to conform with the enlarged sleeve-forming mold cavity to form enlarged sleeve portions in the tube, the internal fluid pressure in the hot plastic tube is periodically lowered as the hot plastic tube is received within the enlarged sleeve-forming mold cavity.

REFERENCES:
patent: 3092874 (1963-06-01), Fallwell
patent: 3188690 (1965-06-01), Zieg
patent: 3286305 (1966-11-01), Seckel
patent: 3520020 (1970-07-01), Williams et al.
patent: 3564087 (1971-02-01), Ruekberg
patent: 3711232 (1973-01-01), Van Zon
patent: 3919367 (1975-11-01), Maroschak

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