Extruder head
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United States of America Patent
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-
Dec 26, 1989
Issued Date -
N/A
app pub date -
Mar 23, 1989
filing date -
Sep 16, 1985
priority date (Note) -
Expired
status (Latency Note)
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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.
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