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US 5,664,307 AGranted
Draw process
AssigneeBarmag AG
InventorsAlbert Stitz, Hans Peter Berger, Ulrich Enders
Life of this patent
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Abstract
A draw process is described, in which yarns in particular of thermoplastic plastics are drawn by influencing their temperature, so as to improve the yarn properties. The process can be employed in a spin process or in a subsequent improvement step. In accordance with the invention, the temperature of the temperature modulating device is controlled as a function of a yarn tension signal, which is obtained within or downstream of the draw zone.
Claims17
A method of processing an advancing yarn comprising the steps of
- advancing the yarn along a path of travel,
- applying a drawing force to the advancing yarn in a draw zone located along the path of travel and so as to draw the advancing yarn,
- monitoring the tension of the advancing yarn at a location along the path of travel downstream of the draw zone and producing a control signal which is representative of the monitored tension, and
- modulating the temperature of the advancing yarn so that the temperature of the advancing yarn is controlled as a function of the control signal.
1 more element
An apparatus for processing an advancing yarn comprising
- means for advancing the yarn along a path of travel,
- means for applying a drawing force to the advancing yarn in a draw zone located along the path of travel and so as to draw the advancing yarn,
- a yarn tension measuring device positioned at a location downstream of the draw zone and for producing a control signal which is representative of the monitored tension, and
- a yarn temperature modulating device positioned at a location along the path of travel so that the temperature of the advancing yarn passing through the draw zone is controlled as a function of the control signal.
1 more element
Dependencies are inferred from the claim text.