Main Factors Affecting The Quality Of Covered Silk Yarn

　　With the continuous advancement of science and technology, all walks of life have also been greatly developed. The development prospect of covered silk yarn is also very good, so the demand continues to increase, and many manufacturers have also increased on the market. As Hangzhou Southeast Textile Co., Ltd. is a polyester yarn factory, it is also necessary to tell you what are the main factors that affect the quality of covered silk yarn.

　　The reason why covered silk yarn has excellent elasticity is due to the stretching characteristics of spandex, and its size depends on the draft ratio when covering. The greater the elasticity. In addition, when using it, it should be known that spandex yarn with a relatively large draft is conducive to forming a covered yarn with excellent elasticity and uniformity. When determining the specifications of spandex yarn and nylon outer yarn, the draft ratio can also be adjusted to change the yarn quality. The content of spandex in the thread reduces the production cost. Of course, a larger draft is used during spinning, and when the yarn is in a relaxed state, the micro-curl of the outer-wrapped nylon yarn increases, so when it is stretched by an external force, the stretching room of the core-spun yarn increases, making it elongate when it breaks. Increase and obtain greater elasticity; therefore, from the perspective of economy and practicality, it is hoped that the larger the pre-stretch ratio selected, the better. Therefore, everyone should know that if the draft ratio is too large, the number of broken ends of the covered silk yarn will increase, which will affect the quality of the yarn, increase the consumption of raw materials, and reduce the production efficiency; if the draft ratio is too small, it will not be easy to exert elasticity. Therefore, the choice of draft ratio should fully consider the tensile properties of spandex yarns of different specifications.

　　In addition, when using covered silk yarn, it is necessary to pay attention to whether it has a covered yarn with different properties. But the thicker the yarn, the weaker the yarn, and the better the elasticity. This is mainly because the strength of the covered silk yarn is determined by the tension of the outer fiber; in the same number of covered yarns, since the spandex content corresponding to the covered silk yarn is less, its strength is greater (the breaking strength of the spandex Much smaller than nylon filament). Of course, this is mainly due to the high price of covered silk yarn. To save costs and reduce yarn prices, under the condition that the yarn performance requirements are the same as other yarn forming process conditions, the selection of fine denier spandex can reduce the content of spandex in the yarn, and the cost will also be reduced accordingly. It is suggested that you can choose to consider factors such as the use of yarn, elastic requirements, design of spandex content, and yarn density. Generally speaking, if high elasticity and high yarn density are required, spandex yarn with a large denier should be selected.