CS229236B1 - A method of selecting a barviol recipe for preparing a dyeing bath - Google Patents

Abstract

The invention is intended to optimize the selection of dyeing recipes for the preparation of a dye bath for dyeing textile products. Optimization is carried out mainly from the point of view of the reproducibility of the operational dyeing. The essence lies in the fact that .. the influence of the concentration deviation of all dyes used in the evaluated dyeing recipes on the dyeing deviation is experimentally determined, then for each dyeing recipe a statistically significant number of dye bath preparations are simulated with varying concentrations of individual dyes with a mean value corresponding to the dyeing recipe specification and with a variance corresponding to the variance of the operational dyeing, while the resulting dyeing of individual simulated cases is graphically recorded in the dyeing space, after which dyeing recipes are selected with an admissible variance of hue and brightness in the color space.

Description

The invention relates to a method of selecting a dye formulation for preparing a dye bath for dyeing textile materials and articles in terms of reproducibility in process dyeing.

There are known methods of assembling and selecting coloring formulations both from the point of view of reaching the desired shade and from the economic point of view. By combining the available dyes, the coloring formulas for the specified shade are assembled and the combinations thus prepared are used to prepare the dyeing bath. where the sum of the cost of each color component is the lowest. Such determination of the most inexpensive dye combination is preferably performed by computer technology. '

However, this known method does not take into account the effects of inaccuracies occurring in the preparation of the dyeing bath, in particular variations in the concentration of the individual dyes and failure to observe the process conditions. As a result, unwanted color variations occur during process dyeing, which reduce the quality of the textile product and thus its economic efficiency.

It is an object of the present invention to overcome these disadvantages and to provide a method for selecting a coloring formulation which ensures that the specified shade is maintained under the usual inaccuracies encountered in process dyeing. _with

The essence of the invention is that for each dye formulation a statistically significant number of dye bath preparations with varying concentrations of individual dyes are simulated with an average

229 239 with the corresponding coloring formula specification and with the variance corresponding to the operational coloring variance, whereby the resulting color simulations evaluate the color variance and select the least variance formula. The color variance is expressed either by the mean value of the color variation or significant components thereof, for example, the mean color variance, or the color variance is expressed by the size of the ellipsoid semi-axis in the color space.

From the point of view of the reliability of the recipe selection it is important that the dispersion of the concentrations of individual dyes in the simulation of dye bath preparations is 2 to 20% ·

From the economic point of view, it is beneficial that the cheapest coloring formula is chosen from the coloring formulas with the lowest color variance.

In particular, the advantage of the invention is the optimization of coloring formulations in terms of operational reproducibility. T _and this advantage is reflected particularly in the dyeing process, where the emphasis is on keeping the hue, for example for dyeing fabrics, knitted fabrics, threads and silk. By utilizing the invention, the amount of color deviation is reduced both within and between backups. As a result, the quality of production will be improved, the number of recolorations will be reduced, and thus the costs.

The formulation of formulas for a given shade is based on a comparison of the color shade of the given shade and the given dyes. Color is mostly represented by spectral. reflectance curve or trichrematic units. On the basis of these known data, the necessary dye concentrations necessary to mimic the color of the given shade are calculated. Usually, the calculation is performed with a series of dyes, most often in the number of three to twelve, so that all possible double, triple and quadruple combinations of the dyes are monitored. For a given shade, a number of recipes are obtained, usually in the number of one to twenty, which can be ordered according to the dyeing costs, thus obtaining an economic optimization. However, the formulations thus obtained may behave differently in terms of reproducibility in process dyeing. Some may be more volatile

229 239 shade for repeated process dyeing, for others to lesser ·

According to the invention, the method of evaluating the degree of color variation and selecting the recipe for its operational reproducibility consists in evaluating the effect of variation in the concentration of the dyes used on the color variance variation. a statistically significant number of dye bath preparations are simulated, with the concentration of individual dyes varying according to the normal distribution with a mean value corresponding to the specified formula and a variance corresponding to the variance in the operational dyeing range of 2 to 20% ·

The variance is chosen either for all dyes constant or graded according to the dye ratio · For the simulated change of dye concentration, the difference in the color of the simulated dye versus the color of the given recipe with the specified basic colors is calculated. the criterion of optimization is of course the economic criterion ·

The color variance can be expressed in various ways, either by the mean value of the color deviation or in the color space by the size of the ellipsoid, by the dimension of the half-axis or by the mean value of the individual components of the color deviation and the like.

For each possible recipe the color variance evaluation is carried out as described above. From a number of individual recipes, the most suitable recipe for which the color variance is lowest is chosen as the most suitable. It is even more advantageous to make an optimized recipe selection not only in terms of minimum color variance but also in terms of minimal dye costs.

Below are two specific examples of coloring formula selection ·

Example 1 ^{229 239}

A total of thirteen suitable formulations were obtained using the three dye combinations from the nine dispersion dyes when preparing the PES comb formulation. The cost of dyes ranged # 44.85 CZK / 57.87 CZK / 100 kg of material.

Using a method of simulating hue variation using a 10% color balance inaccuracy of the dye, it made it possible to rank the recipes obtained in order of hue dispersion as follows:

Dye combination orange scarlet black yellow scarlet black yellow violet black scarlet blue gold brown brown scarlet blue orange violet blue

Medium The cost of coloring deviation

0.13-best q 14 in terms of reproducibility0,21 readability

0.64

0.71

0.74

56.80

59.40 j 80

48.40

45,63-cheapest 48,60

Example 2

For the dark brown shade, the formulas were calculated from 10 specified dyes. 13 suitable triple combinations were obtained in which the cost of the dyes was 189.64 to 238.86 Kc / 100 kg. Using the method of simulating inaccuracy of dye dosing & scattering 10% of the weighed amount of dye, the following series of dyes could be assembled.

Color combinations yellow scarlet blue yellow gold.fire black blue gold.fire black scarlet blue gold.fire yellow scarlet black

Mean color deviation

0.75 -Best from _{0 7I} - ⁱⁿ terms of » 'reprodu0,80 forgeability -7 1.40 1.40

Coloring costs

213.32 221.20 199.20

189,65-cheapest · 234, With this shade it is obvious that the optimal choice will be formula # 3, which has a slightly higher average color deviation, but is the second cheapest formula.

229 238

The invention is intended to optimize the selection of dye recipes for preparing a dye bath for dyeing textile products such as fabrics, knitted fabrics, yarns, tows and the like. The invention also makes it possible to perform optimization for shades that differ slightly from the specified shade. For the application, it is then possible to select a shade whose resistance to technological inaccuracies is highest.

Claims (5)

A method for selecting a dye formulation for preparing a dye bath for dyeing textile materials and articles in terms of reproducibility in process dyeing, characterized in that: - for each Colorants simulates a statistically significant number prepare a dyebath with varying concentrations of individual dyes with the mean value corresponding entry of the coloring formulation as scattering corresponding scattering operation dyeing, with _Λ of the resulting simulated dyeing evaluate scattering color is selected and the formulation with the smallest variance · E. Method for selecting a coloring formulation according to claim 1, characterized in that the color variance is expressed by the mean value of the color deviation or significant components thereof, for example, the mean deviation of the hue. Method for selecting a coloring recipe according to claim 1, characterized in that the color variance is expressed by the size of the ellipsoid half-axis in the color space. Method for selecting a coloring formulation according to claim 1, characterized in that the scattering of the ends of the individual dyes is 2 to 20%, Method for selecting a coloring formulation according to claim 1, characterized in that the ⁴ cheapest coloring formulas are selected from the coloring formulas with the lowest color variance.