Microfiber

Abstract

The present invention relates to a high-tenacity cellulosic regenerated fiber with an individual fiber titer of between 0.6 and 0.9 dtex and yarns and planar textile structures which contain regenerated fibers of this kind.

Claims

1. A high-tenacity cellulosic regenerated staple fiber with an individual fiber titer T between 0.6 and 0.9 dtex, wherein the generated fiber has a tenacity (B.sub.c) in the conditioned state of B.sub.c(cN)?1.3?T+2T and a wet modulus (B.sub.m) with an elongation of 5% of B.sub.m (cN)?0.5*?T, wherein the wet modulus is ?10 cN/tex.

2. A yarn which comprises cellulosic regenerated fibers according to claim 1.

3. The yarn according to claim 2, produced using an air spinning process, wherein the yarn has a fineness of more than 50 Nm.

4. The yarn according to claim 2 or 3, comprising 100% cellulosic regenerated fibers.

5. The yarn according to claim 2, further comprising at least one other fiber type.

6. The yarn according to claim 5, wherein the at least one other fiber type is selected from the group consisting of synthetic microfibers, other cellulosic fibers, and fine fibers of animal origin.

7. A planar textile structure comprising cellulosic regenerated fibers according to claim 1.

8. The planar textile structure according to claim 7 having a weight per surface area of less than 150 g/m2.

9. The planar textile structure according to claim 7, comprising 100% cellulosic regenerated fibers.

10. The planar textile structure according to claim 7, comprising at least one other fiber type.

11. The planar textile structure according to claim 10, wherein the at least one other fiber type is selected from the group consisting of synthetic microfibers, other cellulosic fibers, and fine fibers of animal origin.

12. The yarn according to claim 6, wherein the synthetic microfibers are selected from the group consisting of polyester, polyamide and polyacrylic fibers.

13. The yarn according to claim 6, wherein the other cellulosic fibers are selected from the group consisting of cotton, combed cotton, Lyocell, cupro, linen, ramie, and kapok.

14. The yarn according to claim 6, wherein the fine fibers of animal origin are selected from the group consisting of alpaca, angora, cashmere, mohair and silks.

15. The planar textile structure according to claim 8 having a weight per surface area of less than 115 g/m2.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) Since it was shown that the fibers in accordance with the invention are particularly well suited to the production of high-quality, fine, soft textiles with particularly pleasant wear properties, blends with other types of fiber such as for example synthetic microfibers of polyester, polyamide or polyacryclic, other cellulosic fibers (e.g. cotton, in particular combed cottons, Lyocell, cupro, linen, ramie, kapok . . . ), fine fibers of animal origin such as alpaca, angora, cashmere, mohair, various silks are preferred for use.

(2) With the MVS process so-called core yarns can also be produced, the inner core of which is made of another type of fiber in the form of an outer shell. For example it is possible to produce a yarn with a core of endless filament of polyamide, polyester or elastane and a sheath of the fiber in accordance with the invention and thus to combine the mechanical and comfort properties of the two types of fibers.

(3) Likewise a planar textile structure is the subject-matter of the present invention which contains the fibers in accordance with the invention. Apart from the fibers in accordance with the invention, the planar textile structure and the yarn in accordance with the invention can contain other fibers. The planar textile structure is preferably a woven or knitted fabric, and can however also basically be a non-woven. Likewise for high-quality non-wovens, the use of fibers of regular length and diameter and a high tenacity can be of decisive significance.

(4) Since it has been seen that the fibers in accordance with the invention are particularly well suited to the production of high-quality, fine, soft textile structures with particularly pleasant wear properties, planar textile structures with a mass per unit area of less than 150 g/m2, in particular less than 115 g/m2, represent a preferred embodiment of the present invention. These can comprise 100% cellulosic regenerated fibers or in addition at least one other fine fiber type. For example with the fibers in accordance with the invention, woven shirt and blouse fabrics are possible with a mass per unit area of less than 100 g/m2 of yarns from high-performance processes such as the rotor or air jet spinning processes.

(5) For the reasons named above, synthetic microfibers of polyester, polyamide or polyacrylic, other cellululosic fibers (e.g. cotton, particularly combed cotton, Lyocell, cupro, linen, ramie, kapok . . . ), fine fibers of animal origin such as Alpaka, angora, cashmere, Mohair and various silks, are the preferred blending partners for the production of the very finest yarns and textiles with a lighter weight.

Example 1

(6) A cellulosic staple fiber produced according to AT 287905 in a commercial line with a titer of 0.8 dtex displayed, measured according to the BISFA regulations, a strength of 36.3 cN/Tex in the conditioned state and a modulus of 5.9 cN/tex (5% elongation).

(7) Yarns containing 100% this fiber were produced using the air jet technology on a MVS spinning machine with Nm 100(Ne 60), Nm 135 (Ne80) and Nm 180 (Ne 100). They demonstrated a much higher softness than the yarn produced from the normal Lenzing Modal? fiber.

(8) Moreover, the fiber in accordance with the invention from example 1 was spun as a comparison with the well-known ring spinning and siro processes to fine yarns Nm 180 (Ne. 100) (Tab. 1). It was clearly determined that the air jet yarns revealed a similar tenacity (breaking tenacity) and elongation (breaking elongation) to the ring and/or siro yarns which are known indeed for a high quality but for a much lower productivity.

(9) TABLE-US-00001 Spinning Process MVS MVS MVS Ring Siro Yarn count Nm 100 135 180 180 180 Ne 60 80 100 100 100 Breaking cN//tex 18.3 17.3 16.4 18.3 18.7 tenacity Breaking EF (%) 7.3 6.3 5.6 7.0 6.6 elongation

(10) Knitted fabrics were made from MVS yarns in Nm 100 and/or Nm 135 with weights per unit area in the range of 100 and 125 g/m2. It was possible to produce these knitted fabrics without any difficulties and they revealed excellent useful properties.

Example 2

(11) A cellulosic staple fiber also produced in a pilot plant in accordance with AT 287905 with a titer of 0.65 dtex revealed, measured using the BISFA regulations, a tenacity in the conditioned state of 36.4 cN/tex and a modulus (5% elongation) of 6.3 cN/tex. A yarn made of this fiber also revealed a much higher softness than the yarn made of conventional Lenzing Modal? fiber.