Method for producing a filament yarn with alternating S- and Z-twists
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United States of America Patent
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-
Nov 6, 2001
Grant Date -
N/A
app pub date -
Dec 19, 2000
filing date -
Jun 23, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for producing a filament yarn with alternating S- and Z-twists. The yarn is moved between two twisting stops and submitted alternatively to S- and Z-twisting by at least one false twisting unit. The twists are fixed in a fixing unit situated downstream from the false twisting unit. The twisting stop downstream of the fixing unit is moved synchronously with the yarn and held in a yarn engagement position to stop the twisting until at least the twisting inversion points is fixed in the yarn. At least one other twisting stop oriented at a distance from the above mentioned moving twisting stop is engaged with the yarn in a way to stop the twisting and is moved along with the yarn before said yarn is submitted to an opposite twisting by the false twisting unit.
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