Head for extruding a thermoplastic tubular member

Details Head for extruding a thermoplastic tubular member Head for extruding a thermoplastic tubular member

1978-03-14

1979-05-01

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Plural distinct feed inlets

264173, 264209, 4251331, 425380, 425467, B29D 2304

Patent

active

041521048

ABSTRACT:
In an axially extending extruder head for producing a thermoplastic tubular member, the material to be extruded is first supplied into a pair of annular first passageways spaced apart in the axial direction of the head, these passageways extend obliquely of the head axis. From the first passageways the material enters an axially elongated annular second passageway extending between the two first passageways. An annular third passage, extending transversely of the head axis, conveys the material from the second passageway into an axially extending feed passageway from which the material is extruded through the nozzle end of the head. The first, second and third passageways can be located in different parts of the extruder head.

REFERENCES:
patent: 3478139 (1969-11-01), Martin et al.
patent: 3546743 (1970-12-01), Roth
patent: 3985490 (1976-10-01), Kader
patent: 4038017 (1977-07-01), Langecker
patent: 4048428 (1977-09-01), Baird, Jr. et al.

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