Process for heat treating moving yarns and apparatus therefor

Details Process for heat treating moving yarns and apparatus therefor Process for heat treating moving yarns and apparatus therefor

1993-07-12

1995-02-21

Calvert, John J.

Textiles: manufacturing

Thread finishing

Surface modification of running length

34422, 34629, 28219, 28220, D02J 1300

Patent

active

053904001

ABSTRACT:
A gentle and fast process for heating yarns passing contactlessly through a heating apparatus. The process includes the steps of preheating a heat transfer has to a temperature above the desired final yarn temperature, feeding the preheated heat transfer gas to the yarn duct so that it impinges essentially perpendicularly on the moving yarn and along a length such that the yarn heats up to the desired elevated temperature within the heating apparatus. The present invention may be used for heating air jet textured yarns and for setting two component loops sewing yarns. The invention further relates to an apparatus for carrying out the process including a preheating means, a duct in the form of a tube drilled with holes, feed lines, and a distributor chamber enabling the heat transfer gas to impinge radially upon the outside of the yarn moving contactlessly in the duct.

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