Method of treating synthetic yarns

Textiles: spinning – twisting – and twining – Apparatus and processes – Elements

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28 21, 57157R, D02J 112

Patent

active

039721760

ABSTRACT:
A novel and improved carpet yarn for cut-pile carpets is produced by twisting a strand of yarn having pre-existing latent filament crimp characteristics to a predetermined twist level in a given direction and then plying it with a similar strand or strands having the same amount of twist inserted therein in the same direction. The yarns are plied together, receiving a ply twist essentially equal in amount to the twist in the single strands, but in the opposite direction. The plied yarn is then wound on a rotating mandrel which is also adapted to advance the yarn along the length of the mandrel and through a treatment zone wherein predetermined conditions of heat and moisture are applied to fully develop the latent crimp characteristics of the yarn filaments. The plied yarn is then removed from the opposite end of the mandrel under a minimum tension which is maintained only long enough to remove the yarn from the mandrel and which is immediately relieved by depositing the yarn under no tension in a suitable container for further treatment. The yarn is deposited in such containers in a substantially uniform low density mass wherein linear segments of the yarn are arranged in an irregular short-term configuration which is obtained by rotating the containers while placing the yarn along the radii thereof in a recirpocating fashion. The container of yarn is then positioned in a second treatment zone wherein the yarn is subjected to more severe conditions of heat and moisture adequate to permanently set in the yarn the previously manifested filament crimp characteristics, the yarn twist and ply twist, and the irregular short-term configuration of the plied yarn.

REFERENCES:
patent: 2722729 (1955-11-01), Wilhelm
patent: 2723440 (1955-11-01), Corbiere et al.
patent: 3025661 (1962-03-01), Stub, Jr. et al.
patent: 3683650 (1972-08-01), Hirschburger
patent: 3774384 (1973-11-01), Richter

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