Process of and apparatus for making low shrinkage yarn

Details Process of and apparatus for making low shrinkage yarn Process of and apparatus for making low shrinkage yarn

1997-07-03

1998-08-18

Stryjewski, William

Textiles: spinning, twisting, and twining

Apparatus and processes

Twist setting

28247, 28271, 57289, 57292, 57309, 57351, 57903, D01H 1326

Patent

active

057944270

ABSTRACT:
A process of making a low-shrinkage, air-textured yarn, in particular sewing yarn, of synthetic, pre-oriented polymer multifilaments, includes the steps of drawing multifilaments in the form of a single strand at a temperature of about 180.degree. to 230.degree. C. by a factor of 1.6 to 2.5, air-texturing the drawn strand at a rate of overfeed of 1.03 to 1.20 to form a single-strand raw yarn, feeding the raw yarn to a fluffing zone of predetermined length at a rate of overfeed of 1.003 to 1.025, winding the fluffy raw yarn at slightest possible tension, reeling off and twisting the wound raw yarn, and treating the twisted raw yarn at a temperature of 125.degree. to 135.degree. C. over 1 to 3 hours in a dyeing unit, and, optionally, dyeing the raw yarn. The process is equally applicable for making plied yarns.

REFERENCES:
patent: 4578940 (1986-04-01), Negishi et al.
patent: 5259098 (1993-11-01), Gupta
patent: 5359759 (1994-11-01), Jacob et al.
patent: 5471828 (1995-12-01), King
patent: 5551225 (1996-09-01), Maruki et al.

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