Extrusion die for externally ribbed plastic tubing
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United States of America Patent
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-
Jun 26, 1990
Issued Date -
N/A
app pub date -
May 1, 1989
filing date -
Mar 25, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An extrusion die for externally annularly ribbed seamless plastic tubing has an elongated nozzle within which a hollow mandrel is placed. The nozzle and mandrel define an annular extrusion orifice for extrusion of a parison. The orifice has a coaxial conical portion with its generatrix forming an angle of more than 45.degree. with the longitudinal axis of the nozzle for efficient filling of mold cavities corresponding to annular ribs of the formed tube. The diameter of the inner conical portion at its delivery end may be at least that of the outer portion.
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