Introduction
With the development and application of new textile materials, the designs and varieties of textile products are becoming more and more abundant, and garment processing enterprises are also increasingly demanding quality for printing and dyeing products. High, mainly reflected in the color pattern of dyed products and various fastness indicators of dyed products. This puts forward higher requirements for technicians engaged in color matching and proofing work.
1. Requirements for color matching and proofing technicians
Color matching proofing is a skill. The speed, size and sample rate of proofing mainly depend on the color matching proofing technician’s accumulation of basic information and experience in color matching proofing.
As technicians engaged in color matching and proofing work, you 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 (the color and light of the dye, Strength, color fastness, lifting power, etc.) must be fully understood, and the mixing effect of the three primary colors of dyes must be fully understood, so that the dyes can be correctly selected, color matching, proofing, lofting, and put into production quickly and accurately.
For a technician who is engaged in color matching and proofing work, to accumulate basic information and experience in color matching and proofing, he should start from the following aspects.
1. Production of single-color sample cards
The purpose of making single-color sample cards of dyes is to grasp the color characteristics of the dyes used, that is, color light, The strength, lifting power and the change of color light with dyeing depth when using dyes.
For a beginner, you can make single-color dyeing proofs of the dyes used according to a certain concentration gradient, make a series of single-color sample cards, and find out the law of the color change of the dye with the dyeing depth, and Understand the dyeing properties of the dyes used.
The production method of dye single color sample card is as shown in Table 1
2. Production of color-matching pagoda pictures of three primary colors of dyes
The purpose of making a pagoda diagram of the three primary colors of dyes is to master the principles and methods of the three primary colors of dyes. Technical personnel engaged in color matching and proofing work must master the principles and methods of color matching with three primary color dyes.
Color mixing is a relatively complex problem, but it all follows the principles of additive color mixing and subtractive color mixing.
In actual work, as long as you master the basic principles of color matching and strictly distinguish whether the specific color mixing is additive color mixing or subtractive color mixing, you can improve the efficiency and quality of color matching.
In the color matching proofing of printing and dyeing enterprises, subtractive color mixing is mostly used. The three primary colors of subtractive color mixing are: magenta, yellow, and cyan (usually red, yellow, and blue in practical applications).
2. Comparison between laboratory proofing and workshop production
Between laboratory proofing and workshop production There are certain gaps, and the existence of these gaps will affect the sample rate of dyeing samples. Taking dip dyeing as an example, the similarities and differences between dyeing for small samples and large-scale production are shown in Table 2.
3. Factors affecting the sample size rate of dyeing
In actual production, there are many factors that affect the sample size rate. Through analysis and research, the main aspects are summarized as follows.
1. Differences in the quality of semi-finished products for scouring and bleaching
Whether the quality of semi-finished products used for laboratory proofing is consistent with that of semi-finished products produced in the workshop. So crucial. In actual production, the quality of semi-finished products may be inconsistent due to factors such as different origins of raw materials and different pre-treatment production processes. In addition, it is difficult to match the cloth used for laboratory proofing with the cloth used for workshop production. This will Resulting in a decrease in the sample rate of large and small samples.
Therefore, the principle of frequent replacement should be adhered to in the selection of laboratory semi-finished products. In the actual operation process, in order to avoid the impact of semi-finished products on the sample, it is possible to take bulk semi-finished products for duplicate samples before producing large quantities of goods to prevent the difference in quality of semi-finished products from affecting the sample rate. There are many discussions related to No Borders for the Infected.
2. Differences in dyeing materials
At present, my country does not have strict unified standards for the production and sales of dyes, and the dye market management is not standardized. Basically, They are in separate formations.
The same dye, products produced by different dye companies, or even different batches of dyes produced by the same dye company, have inconsistent shades and strengths, and there are large differences.
3. Differences in dyeing process conditions
Differences in dyeing process conditions are also a key factor affecting the sample size rate.
①Dyeing bath ratio
The dyeing bath ratio is mainly determined by the equipment used for dyeing. The liquor ratio of the dyeing prototype machine is generally 1:20-1:30; the liquor ratio of the jet overflow dyeing machine is generally 1:8-1:15. It can be seen that there is a big difference in the liquor ratio of large and small sample dyeing.
Production practice has proven that changes in dyeing bath ratio will have a corresponding impact on the dyeing results (dyeing depth, color light).
②Dyeing temperature
The difference in temperature during the dyeing process is also an important factor affecting the sample size rate. Taking medium-temperature reactive dyes as an example, different dyes have their own optimal fixation temperatures, and they have different fixation rates under different fixation temperatures.
In actual production, whetherDyeing machines such as these, or jet overflow dyeing machines for production, generally have inaccuracies in temperature measurement and temperature control, causing the temperature displayed on the machine to be inconsistent with the actual temperature of the dye liquor. Generally, there is an error of 3.8°C. .
This will seriously affect the sampling rate of large and small samples.
③Dyeing time
As we all know, in dip dyeing, only by achieving the ideal “dyeing balance” can we overcome or reduce the dyeing color difference and obtain better dyeing weight. performance and improve the sample rate of large and small samples.
However, in actual production, due to the different technical levels and qualities of dyeing operators, their serious and responsible attitudes towards their work are different. There is a lot of randomness in the operation process, so the dyeing time cannot be guaranteed, which affects the sample compliance rate of large and small samples.
IV. Conclusion
Through analysis and research, we know that only by following the following points can we effectively improve the size of samples Sample rate.
1. Conduct regular training for laboratory color matching and proofing technicians and workshop operators to improve their technical quality and quality, improve their quality awareness, ensure the correct implementation of the dyeing process, and avoid human factors The impact on the sampling rate of large and small samples.
2. Try to make the specifications and quality of semi-finished products used for laboratory proofing consistent with those of semi-finished products produced in the workshop to avoid affecting the sample compliance rate of large and small samples due to differences in the quality of semi-finished products.
3. Ensure that the performance of the dyeing materials used in laboratory proofing and workshop production is consistent. The purchased dyeing materials must be tested to ensure the quality of the dyeing materials. Quality problems will affect the sample compliance rate of dyeing samples.
4. Try to make the process conditions of laboratory proofing and workshop production the same or similar. Regular maintenance and upkeep of equipment should be carried out to avoid errors in process conditions caused by equipment reasons that affect the size of samples. Sample rate. </p
