About Recycled Polyester DTY Yarns：basic content and contrast

Recycled polyester yarns are made of recycled materials such as old polyester bottle pieces, spinning waste, bubble material, etc., which are crushed, cleaned, mixed and re-granulated. Due to the big difference in the source of raw materials, the fiber fineness is uneven, the mass specific resistance, the super long fiber content, the defect content, the oil content, the color absorption rate, the physical indexes such as the pitch are very different, and the stability and consistency between the package and the batch are very different. In the process of spinning recycled polyester yarn, there are two typical quality problems: the phenomenon of electrostatic winding and the transverse defects of dyed fabric. The technical measures to solve the problem of electrostatic winding of cleaning comb. There is a lot more about it, Let's learn about it.

Here is the content:

• The brief meaning of DTY

• Comparison of recycled polyester DTY yarn and virgin polyester DTY yarn

The brief meaning of DTY

Draw texturing yarn (DTY for short) is a kind of deforming yarn of polyester chemical fiber. It is made from PET slice, preoriented polyester yarn (POY) spun at high speed, and then processed by drawing and false twisting. It has the characteristics of short process, high efficiency and good quality.

Comparison of recycled polyester DTY yarn and virgin polyester DTY yarn

1. The surface of recycled polyester DTY yarn contains more granular substances than that of native polyester DTY, but there is no obvious difference in molecular structure between the recycled polyester DTY yarn and native polyester DTY.

2. Crystallinity of recycled polyester DTY yarn was lower than that of native polyester DTY, and the lowest was obtained by physical method.

3. The glass transition temperature, melting point and melting heat of the chemically recycled polyester DTY yarn are not much different from that of the original polyester DTY, while the physical method is lower. In addition, the thermal stability of the recycled polyester DTY yarn is slightly worse than that of the original polyester DTY.

4. The fracture strength of recycled polyester DTY yarn was lower than that of native polyester DTY, while the physical method had a higher elongation at break, and the coefficient of variation of the fracture strength and elongation at break of recycled polyester DTY yarn was also higher.

5. The crimp shrinkage, crimp stability and boiling water shrinkage of chemically recycled polyester DTY yarn were not significantly different from those of native polyester DTY, while the physical method was significantly smaller.

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