High-efficiency and energy-saving polyester-cotton dyeing and bathing process

Polyester/cotton fabric is one of the most popular textile fabrics. Because it contains two components of polyester and cotton, it has the advantages of two kinds of fibers, and has the advantages of low price, good hygroscopicity and good shape retention. However, due to the different components, the dyeing process is cumbersome. The traditional dyeing process must include three processes of cotton component pretreatment, polyester dyeing and cotton dyeing. It is not only time-consuming, but also consumes large energy, low efficiency and quality control. Many, product quality is not easy to control.
By applying the new material SR to the processing of polyester/cotton fabrics, Yiwu Jiadelai Co., Ltd. has innovated a new energy-efficient polyester-cotton refining and dyeing process, shortening the process, achieving energy saving and emission reduction, improving processing efficiency and quality. the goal of.
The production process uses polyester-cotton knitted fabric as an example, and adopts SR, glacial acetic acid, high-temperature leveling agent BOF, non-foaming soaping agent, aldehyde-free fixing agent, dispersing dark blue, medium-temperature reactive dye, etc., and the process flow is: SR ×40°C×30min→HAC 0.5g/L, disperse dye x%, BOF run for 10 min →heat up to 130°C for 40 min →cooling reduction cleaning→dyeding→soaping→fixing→soft→dehydration drying→setting .
The technical specifications of the SR new process dyeing finished product are tested simultaneously with the SR new process dyeing finished product and the same specification fabric processed by the traditional process. The results are compared as follows:
The color difference is close to the traditional process ≥3.5;
The fixing rate is equivalent to ≥70% of the reactive dye in the traditional process (depending on the type of dye);
The color fastness to washing is equivalent to ≥3 grades compared with the traditional process;
The color fastness to rubbing is equivalent to ≥2.5 grades compared with the traditional process;
The light fastness is equivalent to ≥3 grades compared with the traditional process;
Contains no 23 carcinogenic aromatic amines;
Formaldehyde ≤ 25ppm;
pH value = 4.5 to 7.5;
Shrinkage rate warp direction, latitude ≤4.5%


The characteristics of the new SR process and the traditional process are compared with the traditional polyester/cotton dyeing process. The new SR process has the following characteristics.
1) Using a new printing and dyeing agent SR synthesized by polymer polymerization without formaldehyde, APEO, biodegradable and environmentally friendly raw materials, it is environmentally friendly, and has high temperature resistance, electrolyte resistance and stability in a wide pH range. Features, fully meet the requirements of dyeing process, to ensure the quality of the products produced is stable, the same effect of different batches. By avoiding the use of alkali in the traditional processing technology for pre-treatment, the fabric is completely eliminated, the washing is not thorough, the cloth is not alkalinized, and it is easy to produce plaques such as alkali spots which are difficult to repair; ensuring the stability and re-enactment of the process Sex.
2) Using the existing equipment of the factory, relying on the support of the efficient and environmentally friendly printing and dyeing new material SR, the pre-treatment process is completed in the subsequent dyeing process, saving the pre-processing process, shortening the processing process, saving time, reducing labor and improving Production efficiency, reduce energy consumption, reduce sewage discharge, reduce production costs, achieve efficient and short process processing, and achieve the goal of reducing energy consumption.
3) Reduce the types of additives, simplify the procurement intensity, reduce the storage burden, reduce the labor intensity and labor, and reduce the addition of a large amount of pretreatment agent to reduce the sewage treatment load.
4) This process simplifies the operation process, and the operation is simple and convenient, and the variable factor that affects the dyeing quality is greatly reduced.


The cost comparison between the new SR process and the traditional process has been proved by production practice that the new SR process can achieve the purpose of energy saving, clean production. According to the actual situation of the actual enterprise, after the comparison of the old and new technology, the processing cost converted to the fabric of 1t per treatment is as follows:
1) Water saving 50t (bath ratio 1:10), according to the tap water price of 5 yuan / t, can save 250 yuan;
2) Reduce the sewage discharge by 50t, and save 100 yuan according to the sewage treatment of 2 yuan/t;
3) Saving processing time 120min;
4) Saving 90 degrees of electricity, according to the average electricity price of 0.68 yuan / kWh, can save 61.2 yuan;
5) Saving steam by 2.5t, according to the steam unit price of 130 yuan / t, can save 325 yuan;
6) Saving pre-treatment auxiliaries: 325 yuan;
7) Reduce labor wages: 55 yuan.

The highly efficient and environmentally friendly new SR technology is a new energy-saving and emission-reduction technology that is worthy of promotion to the industry. According to the annual output of dyed fabrics of 500,000 tons, it can save 25 million tons of fresh water resources, reduce 25 million tons of sewage discharge, save 1.25 million tons of steam, save 45 million kilowatts of electricity, reduce the consumption of caustic soda by 1 million tons, and increase production efficiency by 25%. The comprehensive direct cost per ton of fabric can be reduced by 1116.2 yuan, and the annual cost savings is 560 million yuan. The technology can drive multi-component fiber blending and interlacing fabrics in China's printing and dyeing industry to achieve energy-saving and high-efficiency cleaning and dyeing and finishing production, with great market potential and promotion value, as well as significant economic and social environmental benefits.

Women Nursing Bra