Sizing apparatus
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United States of America Patent
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-
Apr 18, 2000
Grant Date -
N/A
app pub date -
Mar 13, 1998
filing date -
Sep 15, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sizing sleeve for controlling the diameter of plastic tube includes pressurized sizing sleeve portions in which fluid is injected under pressure about the tube circumference to form a lubricating layer. Drainage zones axially separate and isolate adjacent pressurized portions to allow independent temperature and pressure control. Each pressurized portion has flow stabilizer reducing variations in flow responsive to changes in the lubricating layer pressure. The flow stabilizer may comprise a high pressure fluid source and high pressure drop constrictor comprising fine apertures, which may be formed as grooves milled into end surface of abutting sizing sleeve segments.
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