Application of Jiangsu Jingming Mechanical Vacuum Shaving Machine in Textile Industry

In recent years, international and domestic textile market demands for products have become higher and higher. With the advancement of science and technology in the textile industry and the knitting industry, new technologies and new products have also emerged and applied. Vacuum steamers have come to the forefront at this moment. Into the textile machine world. However, the industry has different opinions about it, and it is mixed. According to its own understanding, the writer talks a bit about the experience and tries to throw in the limelight.

1 Comparison between vacuum steamer and traditional steamer

Traditional steaming pans have long been used in the knitting industry of the textile industry, and were first used for setting and shaping textiles and blended products. Put the yarn in a closed container and add saturated steam from the outside. Call it hot and humid setting. With the development of vacuum technology, the vacuum pump is placed on a steaming pan, forming a combination of loose setting and hot and humid setting. It has played a role in the development of textiles and clothing varieties and improves the quality of textiles, but the traditional steaming pan The following drawbacks restrict its application in the textile and knitting industries.

(1) Saturated steam is added to the outside, and the saturation pressure in the vessel is difficult to control and constant. Batches in the process are very different and easy to form yellow white yarn;

(2) The requirements for the bobbin are high, and the paper tube can hardly be used, otherwise it will pollute the yarn near the paper tube;

(3) The structure of the equipment is simple, the treatment of the yarn in the vessel by the steam is not uniform, resulting in a layer difference and product surface contamination;

(4) Unreasonable configuration and high energy consumption.

At present, the new steamer on the market has the following features, just to make up for the insufficiency of the traditional steamer:

(1) The steam generator is set inside the steamer. Under the vacuum state, saturated steam is generated according to the process requirements. This steam is called low-pressure indirect saturated steam. The low-pressure indirect saturated steam is suitable for paper tube steaming and does not make paper. Excessive moisture deformation of the tube, pollution of the product;

(2) Using programmable controllers, precise process control of various process parameters to avoid batch differences. In particular, the programmable controller can achieve precise control of the saturation temperature, prevent the occurrence of superheated steam, and avoid the occurrence of the yellow-white yarn phenomenon;

(3) The top drainage plate is set to prevent the surface contamination of the product; the indirect steam flow process is guided and controlled to avoid the layer difference and the regional difference;

(4) The steam generator has been optimized, the energy consumption of electric heating has been greatly reduced, and the recovery of condensate water has been significantly reduced, which has played a role in boosting the energy saving of the whole machine.

2 The function and application scope of steamer

China's current use of the steamer in the cotton textile industry is mostly used to shape and shape, adjust the resurgence; the knitting industry is used to shape. The steamer is widely used in the textile, knitting, printing and dyeing, clothing, thread making, handicraft and other industries abroad. The author learned from the contacts of Pakistani, Turkish, and Indian textile companies that they are very concerned about the use of steamers. It is particularly noteworthy that steamers are indispensable when designing new plants abroad. Supporting auxiliary equipment is included in the process equipment system. China, as the largest textile country in the world, does not attach importance to steaming machines. Only large-scale and large-scale enterprises are equipped with equipment such as steaming machines, which are used to shape and shape the yarns. However, there are no further researches and developments on the other functions of the steamer.

After all, it is the information age. After all, some textile companies in China have gradually attached importance to the role of steaming machines. The author visited more than two dozen steamer companies in China and summarized their effectiveness according to their different usage conditions.

(1) The cotton textile industry is used to adjust the yarn resurgence, increase the wet strength of the yarn, and further increase the efficiency of the yarn in post-processing. After steamer-treated yarns, the moisture regain rate can be increased to about 8.5%, and both the breaking strength and the fracture work are greatly improved, which is very beneficial to the processing of the post-process. After the steam treatment of the cop, the efficiency of the cotton yarn in the winding and parallel processing can be increased, and the generation of hairiness can be reduced; the steaming treatment of the tube yarn can improve the processing efficiency of the warping, and reduce the influence of the knocking, twisting and twisting defects; Due to the consistency of yarn regain, the sizing rate during the sizing process is stable, the efficiency in weaving can be improved, and the style of the fabric is better.

(2) Steam treatment of yarns in the knitting industry has considerably improved the quality of knitwear processing and finished products. Due to the constant setting of the yarn, the height of the looping is uniform, the unwinding tension is reduced, the uniform size of the tissue is stable, and the cloth surface is clear. In particular, the setting of seamless underwear is an indispensable processing procedure. Steam treatment not only stabilizes the twist of the yarn, but also fully relaxes the yarn and reduces the shrinkage of the finished product.

(3) The printing and dyeing industry applies steam treatment to the sheet cloth so that the stress of the grey cloth during processing is eliminated, so that the color absorbing property is uniform, the color of the fabric is bright, and the color is uniform;

(4) The garment industry steams the fabrics to make the fabrics dimensionally stable, reduce the shrinkage of garments, and increase the sensation of hanging.

(5) The handicraft industry relaxes and shapes the yarns and cloths used in processed products through steaming, especially chemical fiber raw materials. The quality and ornamental quality of finished products have been significantly improved.

3 points in the operation of the steamer

As mentioned earlier, steaming machines have been used for quite a long time in our country. However, as a kind of equipment, there are very few people who study the process rules in operation, and they rarely see similar articles in academic journals. The author conducted some experiments on the steamer and accumulated a bit of experience for analysis and reference by the industry.

(1) Although the steamer can increase the wet strength of the yarn, it is necessary to formulate different steaming processes in combination with the yarn count of the processed yarn and the fiber type of the yarn. The yarn count is low, the raw cotton grade is low, and the internal short fleece content is high. If the vacuum is too high, the yarn is excessively relaxed, and although the moisture regain increases, the cohesion of the fibers inside the yarn decreases, but instead Reduces the strength of the yarn. Below 21 pieces of pure cotton yarn, the vacuum degree is smaller, the steam treatment temperature is lower, and the temperature rise and the constant temperature time are slightly longer. Polyester and cotton blends and pure polyester yarns, as well as combed yarns, have high vacuum degree and high steaming temperature. The temperature rise and constant temperature time depend on the specific twist, and the maximum is not more than 70 minutes;

(2) During the steaming process of yarn, the control of temperature must be based on the type of fiber in the yarn. According to the data, the residual strength of cotton fiber is only 92% after 100 days of treatment at 100°C, while the residual strength of polyester fiber is 100% under the same conditions. Different kinds of fibers, their glass transition temperature, flow temperature, melting and decomposition of thermal indicators such as there are big differences. The highest temperature of cotton fiber, steaming should not exceed 85 °C, the steam temperature of pure polyester fiber can reach 140 °C. Otherwise it will have a great negative impact on the fracture stress and color of the yarn;

(3) The steaming treatment does not improve the indicators such as the dryness of the yarn, but does not deteriorate these indicators. The yarn just emerging from the steamer was detected by a capacitive strip gauge. The dryness cv value and the nep index rose sharply. However, after 24 hours of storage between the storage yarns, the dryer was tested again and all the indicators returned. As it is. After steaming, part of the moisture enters the inside of the yarn to form a relatively stable crystal water, and the other part adheres to the appearance of the yarn to form an unstable surface water. The surface water layer by layer is inconsistent segment by segment, resulting in a difference in the dielectric coefficient, which causes the bargraph to give an erroneous signal;

(4) Because the hygroscopic hygroscopicity of the cotton fiber is determined, the steamed yarn and the product just out of the steamer are preferably placed in the yarn storage room for 30 minutes before being packaged or used. Have sufficient time to evaporate the unstable surface moisture and make the moisture regain uniform inside and outside;

(5) Steamed yarns and untreated yarns must not be mixed; otherwise, they will show obvious lines after dyeing. Knitwear is particularly prominent.

4 Conclusion

From the steaming pan to the steamer, great changes have taken place in terms of name and technology, and the equipment has been manufactured from home and abroad. It is used in different industries for different purposes. People from all walks of life are also benevolent and considerate to the benevolent wise. In particular, it is emphasized that the same steamer is placed in a different area and steamed to handle the same product with different process parameters. Because the atmospheric pressure varies from place to place; the same equipment handles different varieties, and the process used is also quite different. In short, a lot of research and exploration is still needed to achieve meaningful results. The above is only a little rough experience of my steaming equipment. With more and more people in the industry working hard and steaming equipment playing a role in the industry, this equipment can truly make its due contribution to the textile and clothing industry.