Polypropylene BCF yarn is first blended into yarn with two fibers with different shrinkage rates, and then the yarn is treated in steam or hot air or boiling water. At this time, the fibers with high shrinkage rate shrink more and are located in the center of the yarn, while the mixed fibers with low shrinkage rate shrink and are squeezed on the surface of the yarn to form a circle. In this way, we can get puffy, plump and elastic yarn.

Polypropylene BCF yarn woven grey cloth generally after dyeing, fleece (one-sided or double-sided) and other finishing, cloth requirements soft feel, fluffy, elastic and uniform dyeing. Therefore, the expansion degree of Polypropylene BCF yarn, raw material specifications, mixing uniformity and so on are its main performance indexes.

The expansion degree is the expansion degree of the original yarn after wet and hot treatment. It is the main factor that determines the richness, softness and elasticity of the cloth. Generally, the expansion degree of the yarn is above 22%. In actual production, the shrinkage of yarn is generally used as the measured index to test the swelling degree, which is generally between 18% and 19.5%. The measurement of shrinkage rate should pay attention to the following problems:

(1) 20g tension should be added before measuring the length of the original yarn;

(2) Steam the measured raw materials in steam for 5 minutes;

(3) After shrinkage, 20g tension should be added to the expanded yarn before measuring the length.

If the expansion degree is too large, the grey fabric will be tight, poor fluffy softness and inelastic. Expansion degree is too small will lead to grey cloth lax, poor plush feeling.

The mixing uniformity of raw materials is an important reason to affect the dyeing effect. Uneven mixing will lead to uneven dyeing of the cloth, and also affect the expansion performance.

The process of Polypropylene BCF yarn is slightly complicated, and the production cost is therefore higher than other finished silk. It is hoped that the production technology will be greatly improved in the near future, which will open the way for polypropylene bulked yarn.

Nantong Linjia Fiber Products Co., Ltd. is located in the Yangtze River Delta economic development area - Nantong city, Jiangsu Province. The area convenient transportation, close to the metropolis Shanghai, the surrounding highway is convenient, fast! Nantong Linjia Fiber Products Co., Ltd. is specialized in the production of various kinds of polypropylene BCF wire, polypropylene double twist wire, polypropylene high strength wire, polypropylene pustrong wire, engineering fiber, which can be produced according to the samples provided by customers to meet the needs of customers for products. In recent years, the company has served customers on product diversification and color chromatography, and won good reputation and good reputation from many customers in the door and window wool strip industry, carpet industry, ribbon industry, engineering industry and so on. Nantong Linjia Fiber Products Co., Ltd. has decades of experience in chemical fiber production. The company staff are all technical experts, formed a united hard work, positive and excellent team, in the chemical fiber market, our company's goal is "customer satisfaction, our pursuit".