Control method for the manufacture of oriented plastic tubes
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United States of America Patent
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Nov 28, 2000
Grant Date -
N/A
app pub date -
Apr 29, 1998
filing date -
Aug 18, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A method of expanding a tube of plastics material in which a longitudinally travelling tube is progressively diametrically expanded in internal fluid pressure in an expansion zone between an upstream plug and an expandable downstream plug. Expansion of the tube is controlled in response to parameters which directly or indirectly indicate variation in the relative velocity at which material is delivered to and removed from the expansion zone, such as detecting upstream velocity, early expansion diameter, axial force on a sizing device or the tube diameter just before the expansion zone.
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