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[Chemical Knowledge]：Production method and process of pure polyester yarn

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The manufacturing method
of pure polyester yarn
in the field of chemical production raw materials, pure polyester yarn is an important product, widely used in textile, clothing and other industries. This paper will introduce the manufacturing method of pure polyester yarn, including raw material selection, processing technology, post-treatment and so on.

1. raw material selection

pure polyester yarn manufacturing first need to select the appropriate raw materials. Polyester is a synthetic fiber with good physical properties and chemical stability, so it is the main raw material for the manufacture of pure polyester yarn. When selecting polyester raw materials, it is necessary to consider its molecular weight, melting point, viscosity and other indicators to ensure that the subsequent processing process can proceed smoothly.

2. processing technology

1. melt extrusion
polyester raw materials are added to the high temperature and high pressure extruder, through the rotation of the screw and heating, the polyester melt plasticization. The molten polyester is formed into strands through the outlet of the extruder and processed into the next step.

2. Stretching deformation
After cooling, the melt-extruded filaments enter the stretching deformation machine for stretching deformation treatment. Through high-speed stretching and air injection, the shape of the wire is changed to increase its strength and elasticity.

3. Twisting
After stretching and deformation of the wire into the twisting machine, through the twisting treatment to increase its twist, improve the structure and stability of the yarn. During the twisting process, attention should be paid to controlling the twist and tension to ensure the quality of the yarn.

4. Winding
The twisted yarn is wound into a certain shape by a winding machine, which is convenient for subsequent textile processing. Winding tension and speed need to be controlled during the winding process to maintain the winding density and shape of the yarn.

3. post-treatment

1. Heat-setting
pure polyester yarn will produce internal stress during processing, and heat-setting treatment is needed to eliminate internal stress and improve the dimensional stability of the yarn. It is necessary to control the temperature and time during the heat setting process to ensure the quality and performance of the yarn.

2. Testing and scoring
The heat-set yarn needs to be quality tested and scored to ensure that it meets relevant standards and customer requirements. The test contents include the strength, twist and evenness of the yarn.
Precautions for
4.

1. During the entire manufacturing process, it is necessary to keep the equipment clean and in good operation to avoid equipment failure and product quality problems.
2. The storage and transportation of raw materials need to pay attention to measures such as moisture and sun protection to ensure the quality and performance of raw materials.
3. In the manufacturing process, attention should be paid to the control of various process parameters to ensure the quality and performance of the product.

In short, the manufacture of pure polyester yarn needs to go through multiple process steps and post-processing processes, and various process parameters and quality indicators need to be strictly controlled to ensure product quality and performance. At the same time, it is necessary to pay attention to the maintenance and maintenance of equipment, as well as the storage and transportation of raw materials, to ensure the smooth progress of production and the stability of product quality.

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