False twisted yarn

Details False twisted yarn False twisted yarn

1998-04-03

1999-08-03

Calvert, John J.

Textiles: spinning, twisting, and twining

Strand structure

Multifilament yarns

57247, D02G 302

Patent

active

059309890

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a bulky false twisted yarn.
More particularly, the present invention relates to a false twisted yarn with high bulkiness which is superior in crimp shape retention during dyeing and laundering and which is high in stretch recovery.


PRIOR ART

False twisted yarns made of a cellulose fiber are disclosed in JP-A-2-41423, JP-A-2-41428 and JP-A-6-306733. In JP-A-2-41423 and JP-A-2-41428, in particular, false twisted yarns made from a viscose rayon yarn and production processes therefor are disclosed. These false twisted yarns are superior in bulkiness; however, the fabrics made therefrom have problems, for example, in that when the fabrics are subjected to a wetting treatment such as dyeing or the like, or when the fabric products after dyeing are subjected to laundering, the crimp which has been given to the fabrics or fabric products disappears and thereby the bulkiness thereof disappears as well. Thus, fabrics made of conventional false twisted yarns are inferior in crimp shape retention, and it has been difficult to sufficiently utilize the features of the false twisted yarns in final fabric products made therefrom.
As a means for solving such problems, a technique is known for producing a false twisted yarn by mixing a cellulose fiber with a synthetic fiber such as polyester or the like, to allow the yarn to have good crimp shape retention.
However, the fabrics made of such a false twisted yarn produced by mixing a cellulose fiber with a synthetic fiber have problems in that they show a deterioration in touch of surface uniquely possessed by cellulose fiber, i.e., the dry touch possessed by cellulose fiber as compared to a waxy feel (a wax-like touch) possessed by many synthetic fibers, a reposeful and elegant luster similar to silk luster, and drape.
The above-mentioned JP-A-6-306733 mentions a lyocell multifilament yarn, which is a conjugated filament yarn, as an example of an easily fibrillatable fiber and discloses subjecting the yarn to false twisting using a high feed rate (i.e., a high rate of yarn feeding for false twisting). The technique relates to improving the feel of the fabric by subjecting a lyocell multifilament yarn to false twisting to generate fibrils from the yarn and thereby allowing the fabric produced from the resulting false twisted yarn to have a slimy feel (a mixed touch of the above-mentioned waxy feel and a slightly sticky touch). This false twisting at a high feed rate of lyocell multifilament yarn, however, is unable to achieve the bulkiness and crimp shape retainability under wet conditions, as intended by the present invention.


DISCLOSURE OF THE INVENTION

An object of the present invention is to provide a false twisted yarn which has excellent bulkiness and consequent bulging feeling, which has excellent crimp shape retainability even under wet conditions during dyeing, laundering, etc. and which has surface toughness and elegant luster both unique to cellulose fiber.
The present inventors eagerly made a study in an effort to provide a yarn having bulkiness and shape retainability under wet conditions during dyeing, laundering, etc. As a result, the present inventors found out that by allowing a lyocell fiber, which is a cellulose fiber, to have a controlled degree of swelling in water and subjecting the resulting lyocell fiber to false twisting so that the resulting false twisted yarn can have a particular crimp shape, there can be obtained a false twisted yarn superior in bulkiness and crimp shape retainability even under wet conditions. The present invention has been completed based on this finding.
The present invention lies in a false twisted yarn comprising a lyocell multifilament yarn having a crimp shape coefficient, defined by CE/N, of 0.02-0.20, wherein CE is a crimp extension (%) and N is the number of crimps; a crimp extension of 0.7-7%; and a degree of swelling in water of 70% or less.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a process for producing a false twisted yarn using a pin type false twisti

REFERENCES:
patent: 5671757 (1997-09-01), Woodings
patent: 5709716 (1998-01-01), Taylor

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