Importance

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Abstract

In a yarn false twist texturing process in which yarn is passed through heating and cooling zones to a false twist device, the yarn is passed in a helical path around a cylinder at opposed ends of which yarn guides are disposed to provide the helical path, preferably through the cooling zone. In order to raise the surge speed at which the process becomes unstable, at least one of the yarn guides is positionally adjustable relative to another guide and/or a third guide is located between the other two so as to increase the helix angle of the yarn path and the effective angle of wrap around a cylindrical cooling device on which the guides are mounted. The cooling cylinder may be a tube to which suction is applied to draw fumes from the yarn as it passes over a port in the tube and to draw ambient air into the tube to assist the cooling effect. The non-abrupt changes in direction of the yarn path allows the twist to run back through the cooling and heating zones.

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First Claim