SK119195A3 - Decatizing method of fabric - Google Patents

Abstract

A textile fabric, opt. with an appreciable portion of wool fibres, is decatised in an autoclave together with a covering fabric while wound round a perforated decatising drum. The covering fabric is a surface structure of non-oriented fibres weighing less than 80 gm<-2> and having a water vapour permeability of more than 3500 gm<-2>/24 hours.

Description

Method of decatting textile fabric

Technical field

The invention relates to a method of decatting (a vapor deposition for the purpose of de-glossing) a woven fabric of wool fibers or a fabric made using a substantial proportion of wool fibers. In this case, the textile fiber is wound together with the tread on a perforated decatter roller and the coil thus formed is subjected to an autoclave heat treatment.

BACKGROUND OF THE INVENTION

In the generally known decatting processes, the coils are optionally formed outside the decatting autoclaves, and then the coil is placed in the autoclave or inside the decatting autoclave, so that the transport of the coil back and forth is discontinued. the cylinder remaining in the autoclave. For other pressure and dimensional advantages of coil formation and removal within the autoclave, reference is made to DE-AS 17 85 460.

A drawback common to all the known decatting method results from the strip material used as the tread, the width and length dimensions of which must correspond to the textile fabric to be decatted. In this case, the tread is exposed to high pressures and temperatures, as well as to moisture and residual chemicals, in particular carbon acids, reducing agents, sheet fixatives and the like, which have a detrimental effect on the tread. To keep the tread at least for a limited period of use

- durability, valuable fabric is used. But it is not only costly, but it is also burdened with other disadvantages. In order to meet the mechanical and chemical requirements, the tread has to be made robustly, so it is relatively coarse and has a correspondingly high basis weight. The tread thickness promotes undesirable characteristics on the fabric to be decattered and also causes overheating, which can cause unevenness in the processing result. Finally, the tread thickness also limits the capacity of the decatting autoclave for the textile fabric to be processed.

SUMMARY OF THE INVENTION The object of the present invention is to improve the decatting method of the kind described above in such a way that it can be converted more economically over conventional decatting methods, and also enables qualitatively better processing results.

SUMMARY OF THE INVENTION

To solve this problem, the conventional decatting method as set forth in the feature of claim 1 and according to the characterizing portion of claim 1 of the invention have been proposed to use as a tread a flat fabric composed of non-oriented fibers having a basis weight of less than 80 g / m ² and whose water vapor permeability is not less than 3500 g / m ² / 24h.

The woven fabric used in the invention may, for example, be a non-woven fabric which, e.g.

The tread may consist of being made by a method according to the cheap thin of synthetic polypropylene or polyethylene fibers or the like, wherein the fibers may be bonded together according to the type of needle felt or also by chemical or thermal bonding.

What matters is the low basis weight of the tread used and its good water vapor permeability. In contrast, it is possible to give up high mechanical strength because of the low cost of that

-3requires tread manufacturing, while maintaining economical performance even after small tread usage, replace it with a new tread. As a tread suitable, inexpensive, commercially available sheet material is recyclable and can be. thus also reprocessed to a new tread material.

According to one embodiment of the method of the invention, the fabric has a residual moisture of from 10 to 100 wt. % wound on a perforated cylinder and in this state is subjected to a heat treatment.

A particular advantage of this method is that the woven, woven, decatted textile fabric does not require any intermediate drying after dyeing and prior to the decatting process, but must only be spun to the desired residual moisture. On the other hand, with conventional treads, intermediate drying is necessary because the high tread thickness of the wet textile fabric causes overheating.

Finally, an embodiment of the process according to the invention assumes that the residual moisture required during the treatment time of the textile fabric present in the autoclave is maintained and regulated by external steam supply.

Examples

In order to emphasize possible qualitative improvements of the process according to the invention over conventional processes, the following experiments were carried out:

1. A 1.6 m wide combed yarn of plain wool yarn weighing 280 g / m and a corresponding basis weight of 280 g / m 2: 1.6 = 175 g / m ² was declared using a conventional tread with a basis weight of 440 g / m ² .

2. It is precisely such a worsted yarn fabric that has been decatted under otherwise unchanged conditions using a fiber web of 18 g / m ² .

In both decatting processes, the combed yarn fabric was always stored dry in a decatting autoclave. During the decatting process, both the decatting processes consistently added 100 wt. % steam.

The examination of the textile fabric tested with the conventional tread (test I) and the textile fabric test with the process of the invention (test II) gave the following mean values for the following parameters:

A. Determination of Kowabat feel

1. Bending stiffness in μΝτη test I:

osnova str. h. x 7.40; Std. variation with 0,298 getaway x 5.89; H with 0,249 exam II: warp x 7.01 II with 0,346 getaway x 6.23 1! with 0,277

2. Size of the bending hysteresis in mNm / m test I:

osnova str. h. x 0,238; Std. variation with 0.0444 getaway 11 x 0,181; II with 0,0300 exam II warp II x 0,230 II with 0.0524 getaway 11 x 0,197 11 with 0.0272 Stiffness in cut in N / m row test I: warp p. h. x 41; Std. variation with 2.0 getaway 11 x 40; II with 1.4

-5 exam II:

Outline Escape x x 23; 22; 11 II s s 0.7 1.8 4. Hysteresis size in cut at 0,5 ° h N / m test I: osnova str. h. x 0.6; Std. variation with 0.01 getaway x 0.5; II with 0.09 exam II: warp x 0.4; II with 0.04 getaway x 0.4; 11 with 0.03 5. Hysteresis size in cut at 5 ° N / m test I: osnova str. h. x 1.5; Std. variation with 0.02 getaway x 1.4; II with 0.05 exam II: warp x 0.6; II with 0.02 getaway x 0.6; 11 with 0.02 6th Highest ductility at 500 cN / cm in% test I: osnova str. h. x 3.7; Std. variation with 0.19 getaway x 5.7; II with 0.10 exam II: warp x 6.7; 11 with 0.28 getaway x 7.9; 11 with 0.50 7. Tensile work in J / m ² test I: osnova str. h. x 6.6; std . variation with 0.28 getaway x 9.6; 11 with 0.10 exam II: warp x 9.6; 11 with 0.22 getaway x 11.4; 11 with 0.47

8. Recovery capacity in% test I:

osnova str. h. getaway exam II: x x x x 6 6; 65; 67; 67; Std. variation H II II s s with with 1.1 0.7 0.4 0.3 Outline ¹¹ Escape 9. linearity test I: osnova str. h. x 0.74; Std. variation with 0,014 getaway x 0.69; II with 0,011 exam II: warp x 0.58; II with 0,012 getaway x 0.59; n with 0,013 B. Drop coefficient test I: p. h. X 1 0,756; Std. variation with 0,012 exam II: 11 x 0,690; II with 0,026 C. Gloss coefficient test I: p. h. x 1.38; std . variation with 0.00 exam II: n x 1.25; B with 0.03

D. Thickness and compressibility

1. Thickness at 2 cN / cm ² an exam I: Str. h. x 0.391; Std. deviation with 0.004 an exam II: 11 x 0.502;  s 0,006

-Ί-

2. Thickness at 20 cN / cm ² test I:

p. h. x 0.329; Std. deviation with 0,005 test II:

x 0.391; s 0,001

3. Absolute compressibility in mm

an exam an exam I: 0.062 II: 0.111 (comparison feasible medium) (comparison feasible medium) values values it's not it's not Relative compressibility in% an exam I: 15 (comparison of middle values it's not feasible) an exam II: 22 (comparison of middle values it's not

feasible)

E. Areal curvature. according to the Aku-test

First Stamp immediately after release an exam an exam I: 2 II: 4 Second mark after 1 hour recovery an exam I: 5 an exam II: 6-7 3. mark after 2 hours recovery an exam I: 6 an exam II: 7 4. An exam after 24 hours recovery an exam I: 7-8 an exam II: 7-8

(grade 1 to 8: worst for 1 and best for 8)

F. Urea solubility in% (as a measure for chemical changes) Test I: 42.2

Test II: 45.5

Thickness measurements were made according to DIN 53855 and urea-bisulfite solubility according to IWTO (International Wool Technical Organization) 11-64.

area curvature was performed with the support of the Aku-method (cylindrical crouching method) with 3.5 kg load weight and 25 min. load time.

All tests were carried out in a normal climatic environment.

A comparison of the mean values of the test results shows that a surprising improvement in the quality of the textile fabric in different directions is achievable by the decatting method of the invention.

Claims (3)

PATENT CLAIMS A method of decatting a woven fabric of wool fibers or a fabric made using a substantial proportion of wool fibers, wherein the fabric fabric is wound together with a tread on a perforated decatter roller and the coil so formed is subjected to an autoclave heat treatment characterized in that the optical unit consisting of a non-oriented fibers, the basis weight is less than 80 g / m ² and the water vapor permeability of not less than 3500 g / ^m2 / 24h. Method according to claim 1, characterized in that the fabric is wound on a perforated decatting roller with a residual moisture of 10-100 masses. % and in this state it is subjected to heat treatment. Method according to claim 1 or 2, characterized in that the residual moisture of the textile fabric present in the autoclave is always maintained and controlled by the external steam supply during the treatment time.