Production of warp of textured yarns of uniform properties
OwnerBjorn A. Anderseninventor
Life of this patent
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Abstract
A plurality of synthetic fiber yarns which have latent bulk by virtue of false twist texturing or stuffer box crimping are pulled from a creel in the form of a warp between a first pair of rolls and then a second pair of slower moving rolls, passing through a steam chamber therebetween. This produces a pre-shrinking and evens out differences in tension and contractile force within the yarn ends, which renders them especially suitable for further processing as a warp, as in warp printing or dyeing. Since slack may periodically develop in individual ends between the first rolls and steam chamber, the first rolls are occasionally opened instantaneously, causing the slack to be taken out, and the rolls are then brought back together.
Claims7
A process comprising passing a plurality of synthetic yarns having latent texture from a supply into and through the nip of a first pair of rolls in the form of a warp, said yarns having residual shrinkage, driving said first pair of rolls so as to advance said warp, pulling said warp from said first pair of rolls with a second pair of rolls at a speed less than that of said first pair, heating said warp while moving between said first and second pair of rolls at a temperature and for a time sufficient to effect shrinkage of said yarns, the speed of said second pair of rolls being such as to maintain all of the yarns of said warp under almost tension-free condition between said first pair of rolls and the point of heating, and periodically separating said first pair of rolls from one another, whereby slack accumulated in individual yarns between said first and second pairs of rolls will be taken out and said yarns will be restored to equal tensions and a warp of pre-shrunk equally tensioned but almost tension-free synthetic yarns will issue from said second pair of rolls.
Dependencies are inferred from the claim text.