With the continuous improvement of yarn quality requirements, how to reduce defects?

With the continuous improvement of customers' requirements for yarn quality, spinning companies have paid more attention to strictly controlling the yarn quality. At present, the harmful defects affecting the quality of the cloth mainly include thick knots, details, unevenness, flying, neps and abnormal defects. By standardizing production operations, focusing on equipment maintenance, process adjustment and quality control, spinning companies can control yarn defects within the normal range.

The next yarn exhibition will introduce you.

1. Reasonably configure process parameters to reduce spinning yarn defects

Reduce the yarn defects in the semi-finished fabrics can effectively reduce the end break rate of the spun yarn, while reducing the end break rate of the spun yarn can increase the output, reduce the cost per ton of yarn, stabilize the yarn quality, and create favorable conditions for improving the competitiveness of the company's products. We have summarized several specific practices.

In the combing process, do a good job of optimizing the configuration and management of the combing carding elements, to obtain a good carding effect. By actively and effectively selecting the corresponding technical measures, try to reduce the inlays of the top comb and cylinder. This phenomenon prevents the fibers from entering the cotton web in a bundle structure and reduces the chance of end breaks in the next process. Regularly check the tension state and abrasion of the draft toothed belt and the coiled toothed belt. Reasonably adjust the tension of the coiled ring, while reducing the congestion of the coiler, it can also reduce the probability of broken overhead of the draw frame.

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Appropriately reducing the jaw spacing, roller center distance, and draft ratio of the back of the roving will help reduce the CV value of the fine yarn. However, the tightening of the above process will inevitably increase the sliver drafting force and the planktonic fiber control force. The holding force and the drafting force, the guiding force and the control force must be developed simultaneously to draw normally, to prevent the poor roving process, Poor drafting caused by defects in the drafting element and the pressurizing mechanism. Therefore, the jaw spacing of the roving, the center distance of the rollers, the draft multiple in the rear zone, and the total draft multiple seek an optimal combination.

At the same time, it is necessary to strengthen the operation and management to reduce the influence of factors such as the unclean flying of the machine on the sliver and the adverse effect of the winding mechanism on the sliver. If these defects are more serious, sporadic yarn defects may occur.

2. Perfect and rough process control of semi-finished product quality

In the drawing process, after the sliver is combed through the combing process, the fiber separation, parallelism, and straightness are good, but the cohesion between the fibers is poor, and it is easy to loosen and hair, and the fiber will not be in the subsequent process. There is a chance to comb. Therefore, the thickening process should reduce the deterioration of the internal structure of the sliver before the twisting of the sliver, reduce the factors that cause the edge fiber to be defective, reduce the lint and flying flowers attached to the sliver, and reduce the sliver unwinding and curling. Friction, kneading, entanglement and twisting during winding, thereby reducing the neps formed by friction, rubbing, entanglement and twisting.

Reduce the draft multiple and draft force can reduce the growth rate of lint and neps, thus improving the dryness;

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According to the sliver quantification, choosing a smaller diameter of the sliver bell mouth can improve the tightness of the sliver and reduce the chance of local sliver breakage when the sliver is fed after the roving machine, thereby improving the sliver and hairiness;

According to the sliver quantity and barrel capacity, design a reasonable fixed length to avoid too much sliver capacity and cause excessive squeezing between the top sliver and the sliver chassis to increase friction, kneading and twisting to form neps;

It is necessary to control the deviation of the weight of the sliver, reduce the CV value of the sliver, and prevent the details of the yarn length caused by the poor drawing process.

Therefore, the drawing process should reduce the CV value of cooked slivers on the premise of eliminating long details. These are mainly achieved through reasonable design of the process route, configuration of drafting elements and pressurization mechanisms, strengthening of operation management and machine cleanliness.

In the roving process, the CV value of the roving sliver and the structure of the sliver fiber will affect the CV value of the sliver and the frequently occurring yarn defects. The roving quality CV value will affect the spun yarn quality CV value, and roving yarn defects will affect sporadic yarn defects.

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3. Adjust the low-wet blended yarn defect

Aiming at the problems that users report that R / C65 / 3542tex yarn has high yarn defects and many end breaks, we have found out the reasons for the above problems by rewinding the package and analyzing hundred tube yarn defects. By adopting a series of measures, the yarn quality has reached the user requirements.

Analysis of a certain batch of yarn found that the yarn defect in the pre-spinning process was 56%. After investigation, it was found that the moisture regain of this batch of yarn semi-finished products was small. The standard moisture regain was 11.4% after the slivers were mixed, but the actual moisture resurgence was only 7.5% to 7.8%. We have adopted measures such as pretreatment of viscose fibers, humidification of discs, and moisturization during the carding process, so that the moisture regain of the card can reach 9.5%. The production area of the drawing process is also humidified correspondingly, and carbon black rubber rollers are used to prevent the rubber rollers from sucking and entanglement. After the slivers are mixed, the actual moisture regain is more than 8.5%. Through humidification, the spinning production is significantly improved, and yarn defects are also significantly reduced.

The spun yarn has a high front roller speed for spinning coarse yarns. It is advisable to adopt a large-gap, heavy pressurization process and a reasonable pressurization gear to ensure that the drafting force is compatible with the gripping force and reduce the rubber roller. Damage caused by rubber ring.

Because it is a coarse yarn, if the joint parameters are not adjusted properly during splicing, a defect will be formed and it will appear on the cloth surface. Therefore, in the splicing process, parameters such as blown yarn tail, yarn tail superposition, air-jet splicing, and winding speed must be optimized. By adjusting the splicer and the splicer cavity, the speed of the trough can be reduced to 1200 m / min. The main yarn clearing process parameters are short thick + 130% × 1 cm, long thick + 30% × 15 cm, and long thin-40% × 20 Cm, up to 100,000 meters of yarn defects reached about four.

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Through the implementation of the above measures, the production of this type of yarn is stable, and the defect of 100-tube yarn is significantly improved, which has been recognized by users.

Source: Chemical Fiber Headlines

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As we all know, fabric is the source of clothing innovation, and yarn is the source of fabric innovation. The development of the knitting market and the innovation and development of yarn are closely related. At the beginning of the new year, the yarn exhibition will introduce the innovation and fashion trends of yarns, hoping to provide some inspiration for fabric design.

Clothing fabrics are different from chemical fibers and natural fibers. Chemical fiber fabrics are acrylic, nylon, polyester, viscose, etc., as mentioned before. They have the advantages of good elasticity and high moisture absorption. Natural fiber fabrics are mainly cotton, linen, wool, and silk.

Cotton fibers in natural fibers are relatively heat-resistant. For example, the ironing temperature can reach around 190 degrees, but it is best to wet before ironing, which will help the clothes to be smooth and beautiful. Another feature of cotton fiber is acid and alkali resistance, good hand feeling, easy to wash, and relatively comfortable to wear at affordable prices. Generally, underwear and baby clothes are mostly made of cotton. The public also prefers to choose fabrics in the selection of such clothes .Silk fibers are long and thin and belong to protein fibers. The advantages of silk fabrics are that they feel fine, feel soft and smooth, have a good gloss, and are bright, noble and gorgeous.

In recent years, the development and application of new yarns and fiber products have been comprehensively improved, such as elastic fibers, new functional fibers, natural fibers, etc. The development of knitted products will still use these fibers to extend. Because of the soaring international oil prices, the cost of chemical fiber products has risen at the same time. At the same time, the advancement of production technology has made products made of natural fibers have improved significantly in terms of ease of care and functionality. The requirements for comfort and environmental protection are more and more prominent, and it is reasonable that natural fiber knitwear is more and more popular in the market.

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Luxury yarn

The feedback from the market shows that luxury elements occupy a relatively important position in the fashion trend of clothing. As the basis of luxury elements, their demand is also expanding. Cashmere, alpaca, mohair and other luxurious yarns are processed through special technology, which is not only limited to the application of autumn and winter clothing, but also increasingly popular in the spring and summer market. Cashmere is spun with ultra-fine counts and mixed with other fibers such as cotton, which maintains a cool feel while increasing softness. In addition, luxurious cotton has always been the darling of the high-end market. Super long Peruvian cotton has natural comfort, super soft and skin-friendly, and is the most valuable fabric in pure cotton high-end women's fashion. While satisfying women's pursuit of fashion trends, its meticulous and lightweight quality also brings consumers a more perfect physical experience.

Fine wool

Due to the growing demand for fine wool apparel in the international market, the fine wool industry has established a foothold in Europe, and improved Merino wool products have begun to be introduced. Internationally renowned clothing brands have thrown "hydrangea" on fine wool, using more fashionable elements in the design. For example, Italian brands such as Zegna, Dolce & Gabbana and Armani have increased their development efforts on fine wool products, which has strongly affected the entire clothing market.

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Sports and leisure

The development trend of sports and leisure products has been very strong in recent years, so the requirements for moisture absorption, ventilation, and wind and warmth of fabrics have become higher and higher. With the advancement of natural fiber production technology, functional yarns, which are usually dominated by chemical fiber products, begin to tilt towards natural materials. Well-known sports brands such as Puma and Adidas have adopted natural fibers represented by Tencel, and their deepening into the sports and leisure market seems to better illustrate the excellent quality of natural fibers.

Metallic line

Whether used in the form of single yarn or blended with cotton, wool, etc., the metal wire has a very good performance. In the design of knitted garments, the application of metal wires is considered the finishing touch. Lively colors and bright luster are destined to be the darlings of the future fashion market. The innovative application of metal wires has subverted the traditional understanding of yarns. Fabrics containing metal wires have become an important part of future trends due to their unique memory and wrinkle effects. In addition, the fabric containing metal wires can permanently prevent static electricity, radiation, and ultraviolet rays, and can effectively protect pregnant women and office workers who work in front of computers for a long time.

The above is the prospect of yarn trends from the perspective of innovation and technology. Natural fiber products are undoubtedly the current trend of market development. After that, we will analyze the situation of the latest season yarn from the perspective of fashion trends.

Source: China Textile News

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Black stockings are a type of stockings commonly worn by women, referred to as black silk, which is very sexy to wear. There are many black stockings on the market, including nylon silk, crystal silk, cored silk, velvet, Lycra, Teda, and so on. Stockings are very thin, so you must always pay attention to cleaning and maintenance methods. When cleaning, use neutral detergent in warm water and do not wring. Let ’s take a look with Shanghai Sock Show next.

What are the materials of black stockings

1. Ordinary nylon yarn: ordinary nylon silk stockings belong to the early products. The biggest drawbacks are poor elasticity, low transparency, and smoothness.

2. Crystal silk: In order to solve the defects of ordinary nylon silk, crystal silk is available. This material has greatly improved transparency, making stockings no longer rigid, but the disadvantage of poor elasticity has not been improved, and the feel is relatively rough.

3. Core-covered silk: It has high transparency and excellent elasticity. It completely overcomes the defects of nylon silk and crystal silk. Generally, the tightness is the top grade, and the looseness is relatively poor.

4. Velvet: Compared with cored silk, velvet has slightly less transparency, but its elasticity is much higher. Not only does it feel better, it also increases warmth.

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5. Ultra-thin velvet: Weaving with high-tech ultra-fine fiber full-elastic yarn that is softer than hair, with dense and delicate texture, smooth and silky touch, crystal transparency, and good breath ability.

6. Lycra: A new type of fiber introduced by DuPont of the United States. This fiber can be stretched very easily, but it can be closely attached to the surface of the human body after recovery. The binding force on the human body is small. It's comfortable and fits well on the body. Lycra-containing stockings have better performance in elasticity and resilience, chroma and breath ability.

7. TEDA: High-tech polyester fiber developed by DuPont. It is soft to the touch, breathable and comfortable to wear. The fabric made by TEDA is fine, breathable, soft, comfortable and wrinkle-resistant, and the fabric shines , Clothing as new.

How to clean and maintain stockings

Clean

1. Wash with warm water in a neutral detergent. Do not wring. Use a dry towel to absorb excess water. When washing the stockings, use mild soapy water to soak the stockings for a while. Use mild neutral soap or shampoo to pat gently with warm water (not more than 30 degrees), and absorb excess water with a towel when drying. , The sun is the most jealous, as long as it is directly exposed to the sun, its fiber elasticity fatigue is greatly reduced, and then dry the socks with clothespins, do not dry on a smooth drying rack, easy to hook.

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2. Dry naturally in a cool place.

3. Do not use in the sun or iron.

4. If washing with a washing machine, please put stockings in the washing net before throwing them into the washing machine.

maintenance

New stockings should be soaked in water and placed in the freezer of a refrigerator. After the stockings are frozen, take them out and let them melt and dry naturally so that they are not easily damaged when worn. After freezing the fibers in stockings, the strength of the fibers will increase. Therefore, frozen stockings are less likely to be threaded than ordinary stockings. Similarly, soaking nylon socks in vinegar water has a similar effect. These are all ways to reduce the activity of the molecule. However, the elasticity of the corresponding stockings decreases.

When the socks are threaded, apply a little glue or nail polish to the broken silk ends, and then gently scrape them with your hands. The broken silk ends will stick firmly and will not fall off. Larger, you can take a piece of old stockings of the same color with strong glue, then stick it to the hole, and it will be repaired when it is dry, but be sure to cover the stockings on a smooth cylinder and flatten it. Otherwise it will not be worn if it sticks together.

Stockings are not resistant to high temperatures. It is best to replace the stockings you wear when you work at the kitchen to prevent high-temperature objects such as stoves and ovens from deforming and contracting the stockings, which affects wearing. Stockings are not easy to be gnawed by insects, no insect repellent, sanitary balls, etc. are needed for storage, and they can be stored after washing and drying.

Source: Network finishing

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