Head for extrusion of a tubular parison formed of at least one layer of material
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United States of America Patent
Stats
-
Sep 18, 1984
Grant Date -
N/A
app pub date -
Apr 5, 1982
filing date -
Apr 9, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Improved extrusion head for use in forming plastic containers or tubular films (optionally with multi-ply walls) by the extrusion-blowing process. The typical extrusion head used in this process has flat compensating rings bounding a portion of the frustoconical flow passages which ultimately feed the extrusion orifice. These are replaced by spherical segmental rings having a beveled surface in the form of a spherical, conical, toric or ogival shape which bounds said flow passage and thus eliminates stagnating recesses (of the type encountered through use of the prior art flat rings).
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- Non-US Classification not provided for expired patents
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- Citation Ranking not provided for expired patents
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