Textiles: Requirements for Color Matching Technicians

With the development and application of new textile materials, the variety of color products of textile products is becoming more and more abundant. Apparel processing companies have higher and higher quality requirements for printing and dyeing products, which are mainly manifested in the color of dyeing products and various items of dyeing products. Fastness indicator. This puts higher requirements on technical personnel engaged in color matching and proofing.

1 Requirements for Color Matching Technicians

Color proofing is a skill, and the proof rate of proofing speed and proof size depends mainly on the accumulation of basic data and experience of color proofing technicians.

As a technical personnel engaged in color matching and proofing work, one should master the basic principles and methods of dye color matching, the properties of dyeing materials and textiles, especially the color characteristics and basic properties of the dyes used (dye shade, strength, color fastness and Lifting force, etc.) must have a full understanding of the three primary colors of the dye, and the effect of color mixing must be sufficiently understood so that dyes can be correctly selected, and colors can be quickly and accurately matched, sampled, staked, and put into production.

For a technical staff engaged in color matching and proofing work, it is necessary to accumulate the basic materials and experience of color matching and proofing, and should start from the following aspects.

1.1 Making Monochromatic Cards

The purpose of making a monochromatic card of dyes is to grasp the color characteristics of the dyes used, ie, the shade, force, lifting force, and the rule of the color light changes with dyeing depth when the dyestuffs are dyed.

For a beginner, the dyestuff can be dyed with a certain concentration gradient and monochrome proofing, made into a series of monochrome card, and find out the law of the color of the dye with the dyeing depth, and master the dyeing performance of the dye used. Dye monochrome sample card manufacturing method as shown in Table 1

1.2 The production of three-color fight color pagoda map

The aim of the three-primary color fight color pagoda map is to master the principle and method of color matching of three primary color dyes. The technical personnel engaged in color matching and proofing work must master the principles and methods of color matching with three primary colors.

The mixing of colors is a more complicated problem, but they all follow the principle of additive color mixing and subtractive color mixing.

In practice, as long as the basic principles of color matching are mastered, and the specific color mixing is strictly distinguished by additive or subtractive color mixing, the efficiency and quality of color matching can be improved.

Most dyeing and coloring companies use subtractive color mixing. The three primary colors of subtractive mixing are: magenta, yellow, and cyan (usually red, yellow, and blue in practical applications).

2 Comparison between laboratory proofing and workshop production

There is a certain gap between laboratory proofing and workshop production. The existence of these gaps will affect the sample size of dyeing. Taking dip dyeing as an example, see Table 2 for the similarities and differences between dyeing and large-scale production.

3 Factors affecting the sample size

In actual production, there are many factors that affect the size of sample sample rate. Through analysis and research, there are mainly the following aspects.

3.1 The difference in the quality of training and bleaching semi-products

Whether the semi-finished product used for laboratory proofing is consistent with the quality of the semi-manufactured product in the workshop is crucial for the sample size. In actual production, the quality of the semi-finished products may be inconsistent due to the influence of factors such as the origin of the original billets and the pre-processing production process, and it is difficult to match the fabrics used in the laboratory proofing with the production fabrics in the workshop. Causes a decrease in the size of sample size.

Therefore, the selection of laboratory semi-finished products must adhere to the principle of diligence. In the actual operation process, in order to avoid the semi-finished products to bring the sample to bring the impact, you can take the goods before the production of large goods and semi-products for re-sample, to eliminate the semi-finished product quality and affect the sample rate. There are many related discussions among the affiliated people.

3.2 Differences in dyes

At present, there is no strict uniform standard for dye production and sales in China, and the dye market management is not standardized. Basically, it is their own team.

The same dyes, products produced by different dye companies, and even different batches of dyes produced by the same dye company have different shades and strengths, and there are big differences.

3.3 Differences in dyeing process conditions

The difference in dyeing process conditions is also a key factor affecting the sample size.

3.3.1 dye bath ratio

The size of the dye bath is mainly determined by the equipment used for the dyeing. The bath ratio of the dyeing machine is generally 1:20 to 1:30; the bath ratio of the jet overflow dyeing machine is generally I:8 to 1:15. It can be seen that there is a large difference in bath ratios between large and small samples.

Production practices have shown that changes in dye bath ratios can have a corresponding effect on the results of dyeing (dye depth, shade).

3.3.2 Dyeing temperature

The difference in temperature during the dyeing process is also an important factor that affects the sample rate. In the case of medium-temperature reactive dyes, different dyes have their own optimal fixing temperature, and they have different fixing rates under different fixing temperature conditions.

In actual production, no matter whether it is a sample dyeing machine or a jet overflow dyeing machine for production, the inaccuracy of temperature measurement and temperature control generally exists, causing the display temperature of the machine table to be inconsistent with the actual temperature of the dye liquor. 3.8°C error.

This will seriously affect the sample size.

3.3.3 Dyeing time

It is well known that dip dyeing can only overcome or reduce the color difference of dyeing, achieve good dyeing reproducibility, and improve the sample sample rate.

However, in actual production, due to the differences in the technical level and quality of the dyeing operators, they have different attitudes towards the work. The arbitrariness during the operation is large, so that the dyeing time cannot be guaranteed, and the sample rate of the size is affected.

4 Conclusion

Through analysis and research, we know that only when we do the following points can we effectively increase the sample sample rate.

4.1 Periodical training for laboratory color matching technicians and workshop operators to improve their technical water quality and quality, improve their quality awareness, ensure the correct implementation of the dyeing process, and avoid the size due to human factors The effect of sample rate.

4.2 As far as possible, the semi-finished products used in the laboratory are the same as the specifications and quality of the semi-manufactured large-scale products in the workshop, so as to avoid affecting the sample size due to the difference in quality of semi-finished products.

4.3 Ensure that the laboratory proofing is consistent with the performance of the dyeing materials used in the large-scale production of the workshop. The purchased dyestuffs should be tested to ensure the quality of the dyeing materials. Do not influence the dyeing due to the quality of the dyeing materials. Sample sample rate.

4.4 Try to make the laboratory proofing process the same or similar to the production conditions of the workshop. The equipment should be maintained and maintained on a regular basis to avoid the error of the process conditions and affect the sample rate.

Study on Increasing the Success Rate of Cotton Fabric Dyeing

Guo Kaihua, Liao Xuating

"Textile Industry and Technology" February 2013 first issue

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