In-line tubing die
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United States of America Patent
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-
Mar 5, 1996
Grant Date -
N/A
app pub date -
Oct 20, 1994
filing date -
Oct 20, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An in-line tubing die for forming thin walled plastic tubing from molten plastic extrudate is provided. The hub of the tubing die is concentrically positioned within a housing and held in place by radially extending fins that join the housing to the hub. Every one of the fins that holds the hub within the housing has an air passage formed through it so that the fins are of a uniform temperature and the plastic extrudate flows uniformly around each of the fins to keep the thickness of the plastic tubing walls uniform around the entire circumference of the tubing. An annular groove or grooves are provided around the housing and are enclosed by a sheath which permits the air to circulate around the housing and be warmed to some extent before entering the passages within the fins and thereafter entering into the passage extending coaxially with the hub and into the interior of the plastic tubing.
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