Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-10-08
1999-07-20
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528322, 528332, 428357, 428364, 428395, 428397, 264103, 264129, 264130, 2642108, 26421115, 26421117, C08G 6908, D02G 300, B32B 2734
Patent
active
059257270
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a thick and thin polyamide based multifilament having dry touch and a, rustling touch, capable of manifesting a difference of color shade over a short periodic length when dyed, and having excellent color fastness.
BACKGROUND ART
Polyamide fibers have been mass-produced for clothing, industrial use and interior use because of their excellent fiber properties. However, polyamide fibers, particularly fibers obtained from nylon 6, 66, etc. are poor in dry touch as presented by polyesters used as general purpose fibers, and have a greasy touch. For reducing the greasy touch, the use of thick and thin yarns has been attempted.
For production of thick and thin polyamide fibers, as techniques for causing melt fractures by use of abnormal flow at the spinneret, those disclosed in Japanese Patent Publication (Kokoku) Nos. 42-22576 and 44-7744 are publicly known. Furthermore, Japanese Patent Publication (Kokoku) No. 44-15573 discloses a method of spinning in a stress range to cause melt fractures by mixing a polyamide based polymer with a material having poor compatibility with the polymer. Moreover, Japanese Patent Laid-Open (Kokai) No. 55-122017 discloses a thick and thin yarn made of a composition obtained by mixing a polyester and a polyamide. Still furthermore, Japanese Patent Laid-Open (Kokai) No. 58-36210 discloses a method comprising the steps of blend-spinning a polyamide and a thermoplastic polymer 80.degree. C. or higher in glass transition temperature, and drawing at a low ratio. However, all of the above methods are poor in stability in the yarn forming process, and yarn breaking is likely to occur, making continuous production difficult.
Japanese Patent Laid-Open (Kokai) No. 63-211335 discloses a thick and thin yarn changing in sectional area in the axial direction by heat-treating an undrawn polyamide yarn at 110.degree. C. to 200.degree. C., to keep the crystallinity at 35% or more, and subsequently drawing at a low ratio of 1.2 to 3.0 times. However, the multifilament obtained is as long as many centimeters to several meters in the periodic length of thickness unevenness in the length direction of the multifilament, and furthermore, even though thickness unevenness can be obtained since the crystallinity of the undrawn yarn is enhanced before irregular drawing, the color shade contrast obtained when dyed is weak, and the color fastness is poor, and lowers the commercial value.
DISCLOSURE OF THE INVENTION
The present invention is intended to obtain fibers to provide a color shade contrast short that is in periodic length when dyed, and also to provide natural irregularity and microscopic unevenness on the surface of the fabric produced from the fibers, in a material with a dry touch and a rustling touch to the eyes, and by touch.
The object of the present invention can be achieved by providing thick and thin polyamide based fibers, characterized in that the unevenness of thickness in the length direction of the polyamide based multifilament is 5 to 20% expressed as Uster Evenness value and that the standard deviation of stress at 40% elongation in the stress-strain curve, with a sample length of 20 cm, is 0.3 g/d or less.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is one example of a drawing machine, useful in the present invention, for producing a thick and thin yarn using an undrawn yarn.
FIG. 2 is another example of a yarn forming machine, useful in the present invention for producing a thick and thin yarn by direct spin drawing.
In the drawings, symbols 1 and 10 indicate undrawn yarn, 2, nip rolls; 3 and 11, feed rolls; 4 and 12, a fluid vortex nozzle; 5 and 13, draw rolls; 6, a third delivery roll; 7 and 14, a thick and thin yarn; 8, a spinneret; and 9, an oiling roller.
THE MOST PREFERRED EMBODIMENTS OF THE INVENTION
In the present invention, the fabric obtained by using polyamide based fibers of 5 to 20% Uster Evenness value has a color shade contrast achieved by dyeing and natural irregularity, and furthermore, has microscopic uneven
REFERENCES:
patent: 4242862 (1981-01-01), Negishi et al.
patent: 4969322 (1990-11-01), Sasaki et al.
patent: 5259098 (1993-11-01), Gupta
patent: 5360667 (1994-11-01), Boles, Jr. et al.
Higuchi Tetsunori
Onda Kiyoshi
Hampton-Hightower P.
Miller Austin R.
Toray Industries Inc.
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