Extruder head

Details Extruder head Extruder head

1989-03-23

1989-12-26

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

264171, 4253761, B29C 4706, B29C 4720

Patent

active

048894770

ABSTRACT:
An extruder head for the extrusion of tubular preforms having single-layer or multiple-layer walls, from plastics material which has been plasticized in extruders. The extruder head utilizes the so-called coextrusion system. The extruder head includes a plurality of equal or similar head parts which can be optionally placed one behind the other and each have a central annular discharge and/or passage duct. Each of the head parts has at least one spirally extending distributor which leads via an annular gap to the discharge and/or passage duct. The ends of adjacent head parts facing one another have complementary engagement elements which are used to bring the discharge and/or passage ducts into axial alignment.

REFERENCES:
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patent: 4047868 (1977-09-01), Kudo et al.
patent: 4167383 (1979-09-01), Marakami et al.
patent: 4370114 (1983-01-01), Okamoto et al.
patent: 4522775 (1985-06-01), Briggs et al.
patent: 4578025 (1986-03-01), Ando et al.
patent: 4657497 (1987-04-01), Dehennau et al.

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