HU218075B - Method for decatizing textiles - 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

BACKGROUND OF THE INVENTION The present invention relates to a process for decoupling textiles which is wholly or substantially made of wool fibers. In this process, the textile fabric, together with a running pad, is wound on a perforated decathloning roll and the resulting roll is subjected to autoclaving.

In the commonly known decoding process, said coil is optionally formed either outside the decoding autoclave and then the coil is introduced into the autoclave or the coil is produced in the decoding autoclave so that there is no transport of the coil backward, since the completion of the decontamination treatment Afterwards, the textile article, together with the running washer, is pulled from the decompression cylinder remaining in the autoclave. Further pressure and dimensional advantages of autoclave winding and unwinding can be found in DE-AS 17 85460.

The common disadvantage of all known decoating processes is the use of a web of tapes used as a running mat, whose width and length must correspond to the textile fabrics to be decoded. In addition, the cohesive washer is subjected to high pressures and high temperatures, as well as moisture and residual chemicals, especially acids from carbonating agents, reducing agents, surface fixatives and the like, which have an overall detrimental effect on the cohesive washer. In order to maintain the stability of the co-operative washer for at least one limited application period, high-quality technical fabric must be used for this purpose. However, this is not only costly but also has significant additional disadvantages. In order to meet mechanical and chemical requirements, the cooperating washers must be robust in design, resulting in relatively high thickness and high surface mass. The thickness of the running pad creates unwanted marks on the tissue to be decalculated, but also causes heat shocks, which can result in uneven treatment results. Finally, the thickness of the cooperating pad also limits the filling capacity of the decoding autoclave for the textile fabric to be treated.

It is an object of the present invention to improve the decathloning method described in the introduction so that the process can be carried out more economically than the conventional decatheterization method and, in addition, provide better qualitative treatment results.

The object according to the invention starting from that described by way of introduction dekatálási process is solved in that a surface shape consisting of directional fibers backing running together with a surface weight of less than 80 g / m ^2, and having a water vapor permeability of at least 3500 g / m ^2/24 hours.

The surface shape used as a cooperating pad in accordance with the present invention may be, for example, an inexpensive, thin filament fabric made from synthetic polypropylene or polyethylene fibers or the like, which may be bonded to one another or even chemically or thermally bonded to one another. . It is important that the co-washer used has a low surface weight and good water vapor permeability. Conversely, high mechanical strength can be dispensed with, since the low cost of manufacturing the co-washer, while maintaining economy, allows the co-washer to be replaced with a new co-washer after a small number of applications. In addition, the low-cost, commercially available flat material suitable for use as a cooperating washer can be recycled to form a new cooperating washer.

In one embodiment of the process of the present invention, the tissue is wound on a perforated decoupling roll with 100% residual moisture and is heat treated in this condition.

A particular advantage of this process is that the woven fabric to be decoupled in the wet state does not require intermediate drying after dyeing and prior to the decontamination process, but has to be coiled only to the required residual moisture. In contrast to conventional co-washers, intermediate drying cannot be omitted, since the high co-op washer thickness can cause overheating heat build-up in a wet textile fabric.

Finally, in one embodiment of the process of the invention, it is planned to maintain and control the residual moisture content of the textile fabric in the autoclave during treatment by external steam injection.

The following experiments were carried out to explain the quality enhancement of the present invention compared to the conventional method.

1. A 1.60 m wide, 280 g / m 2 running weight corresponding to 280 g / m: 1.60 m = 175 g / m ² pure wool comb fabric was decoded with a conventional 440 g / m ² continuous woven pad. .

2. The same worsted web was decapitated under otherwise unchanged conditions using a co-operative pad of only 18 g / m ² filament.

In both decontamination processes, the comb tissue was always introduced into the decanting autoclave in a dry state. During the decontamination process, 100% by weight of moisture was added in the same manner to both decadation processes by steam.

The mean values given for the following parameters were obtained from the examination of a decomposed textile fabric sample (hereinafter referred to as Test I) using a conventional co-operative washer and a fabric decoded fabric decoded according to the invention (hereinafter referred to as Test II):

(A) Determination of tissue grip according to Kawabata

1. Bending strength in pNm

Test I: Average Yarn x 7.40;

standard deviation s 0.298 weft mean x 5.89; standard deviation s 0.249

II. probe: Yarn mean x 7.01;

standard deviation s 0, 346 mean weft x 6.23; standard deviation s 0.277

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2. Bending hysteresis value in mNm / m

Test I: yarn mean x 0.238 standard deviation s 0.0444 mean x 0.181; standard deviation s 0.0300

II. probe: Yarn mean x 0.230;

standard deviation s 0.0524 weft mean x 0.197; standard deviation s 0.0272

3. Shear elasticity in N / m rad

Test I: Chain Mean x 41;

standard deviation s 2.0 weft mean x 40; standard deviation s 1.4

II. probe: Yarn mean x 23;

standard deviation s 0.7 weft mean x 22; standard deviation s 1.8

4. Shear hysteresis value at 0.5 ° N / m

Test I: Chain Mean x 0.6;

standard deviation s 0.01 weft mean x 0.5; standard deviation s 0.09

II. probe: Yarn mean x 0.4; standard deviation s 0.04 mean weft x 0.4; standard deviation s 0.03

5. Shear hysteresis value at 5 ° N / m

Test I: average yarn of the chain χ 1.5; standard deviation s 0.02 weft mean x 1.4; standard deviation s 0.05

II. probe: Yarn mean x 0.6;

standard deviation s 0.02 weft mean x 0.6; standard deviation s 0.02

6. Elongation at maximum tensile force at 500 cN / cm%

Test I: Chain Mean x 3.7; standard deviation s 0.19 weft mean x 5.7; standard deviation s 0.10

II. probe: Yarn mean x 6.7; standard deviation s 0.28 weft mean x 7.9; standard deviation s 0.50

7. Tensile work in J / m ²

Test I: Average Yarn x 6.6; standard deviation s 0.28 weft mean x 9.6; standard deviation s 0.10

II. probe: Yarn mean x 9.6; standard deviation s 0.22 weft mean χ 11.4; standard deviation s 0.47

8. Recovery ability in%

Test I: Chain Mean x 66; standard deviation s 1.1 weft mean x 65; standard deviation s 0.7

II. probe: Yarn mean x 67; standard deviation s 0.4 weft mean x 67; standard deviation s 0.3

9. Linearity

Test I: Chain Mean x 0.74; standard deviation s 0.014 weft mean x 0.69; standard deviation s 0.011

II. probe: Yarn mean x 0.58; standard deviation s 0.012 weft mean x 0.59; standard deviation s 0.013

B) Drop coefficient

Test I: Mean x 0.756;

standard deviation s 0.012

II. test: mean x 0.690;

standard deviation s 0.026w

C) Brightness number

Test I: Mean x 1.38;

standard deviation s 0.00

II. test: mean x 1.29;

standard deviation s 0.03

D) Density and Compressibility

1. Density at 2 cN / cm ²

Test I: Mean x 0.391;

standard deviation s 0.004

II. test: mean x 0.502;

standard deviation s 0.006

2. Density at 20 cN / cm ²

Test I: Mean x 0.329;

standard deviation s 0.005

II. test: mean x 0.391;

standard deviation s 0.001

3. Absolute compressibility in mm

Test I; 0.062 (no mean comparison possible)

II. test: 0.111 (no mean comparison possible)

4. Relative Compressibility in%

Test I: 15 (no mean comparison possible)

II. test: 22 (no mean comparison possible)

E) Surface creasing according to the Battery test

1. Rating immediately after unloading

Test I:

II. test: 4

2. Rating after 1 hour of recovery

Test I: 5

II. trial: 6-7

3. Rating after 2 hours of recovery

Test I: 6 II. trial: 7

4. Rating after 24 hours of recovery

Trial I: 7-8

II. Trial: 7-3 (Grades 1-8: Grade 1 is the worst, Grade 8 is the best score)

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F) Urea Bisulphite Solubility (HBL) in% (as a measure of chemical change)

Test I: 42.2

II. test 45.5

Density was measured according to DIN 53 855 and urea bisulphite leachability according to IWTO (International Wool Technical Organization) 11-64.

Surface creasing was performed using the Aku method (cylindrical creasing method) with a load of 3.5 kg and a loading time of 25 minutes.

All tests were performed in a normal climate.

A comparison of the mean values of the test results demonstrates that the decoupling process of the present invention achieves a surprising quality improvement in the textile fabric in many respects.

Claims (3)

PATENT CLAIMS CLAIMS 1. A method for decoding a textile fabric of wool or a substantial portion of wool fiber, wherein the textile fabric is wound together with a running mat to a perforated decathloning cylinder and the resulting roll is subjected to an autoclave heat treatment, wherein Less than 80 g / m ² and having a water vapor permeability of 3500 g / m ^{2 or more} per 24 hours. A process according to claim 1, characterized in that 10-100% by weight of the remaining moisture content of the textile fabric is wound on a perforated decoupling roll and subjected to a heat treatment in this state. Method according to claim 1 or 2, characterized in that the residual moisture required for the textile fabric in the autoclave at all times during the treatment is maintained and controlled by external steam supply.