Head for extruding thermoplastic tubes

Details Head for extruding thermoplastic tubes Head for extruding thermoplastic tubes

1978-08-25

1980-06-17

Lowe, James B.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Core, pin or insert member

4251331, 425462, B29D 2304, B29F 304

Patent

active

042081785

ABSTRACT:
An extrusion head for producing tubes of thermoplastic material includes a housing laterally enclosing a mandrel and an extruding nozzle mounted on one end of the housing. The housing and mandrel combine to form an accumulator space into which the thermoplastic material is charged from a source. One of the housing and the mandrel includes an extrusion plunger which is displaceable away from the nozzle into the accumulator space for displacing the thermoplastic material toward the nozzle. As the plunger moves into the accumulator space it forms one side of a variable length annular passageway defining the outlet path of the thermoplastic material from the accumulator space.

REFERENCES:
patent: 3205534 (1965-09-01), Langecker
patent: 3345690 (1967-10-01), Hagen
patent: 3611494 (1971-10-01), Feuerhern
patent: 3690806 (1972-09-01), Kovacs
patent: 3909183 (1975-09-01), Hsu
patent: 4120633 (1978-10-01), Feuerhern

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