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[Chemical Knowledge]：Manufacturing method and process of semi-extinction POY

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The manufacturing method
of semi-extinction POY
1. Introduction

In the field of chemical production raw materials, semi-extinction POY (partially oriented silk) is an important chemical fiber product, widely used in textiles, non-woven fabrics, industrial silk and other fields. Semi-extinction POY has the advantages of high strength, high elasticity and low heat shrinkage, so it is popular. This paper will introduce the manufacturing method of semi-extinction POY, including raw material selection, production process, equipment selection and so on.

2. raw material selection

manufacturing semi-extinction POY's primary task is to choose the right raw materials. Commonly used raw materials are polyester chips, titanium dioxide, oil and so on. Among them, polyester chip is the main raw material, and its quality has an important influence on the performance of semi-extinction POY. Therefore, when choosing polyester chips, we should consider its viscosity, melting point, titanium dioxide content and other indicators.

3. production process

1. Drying

polyester chips need to be dried during the manufacturing process to remove moisture. Generally, hot air drying or vacuum drying is used to control the moisture content in the slices below 0.005%.

2. Melt extrusion
The polyester chips after
drying enter the extruder and undergo high-temperature melt extrusion to form a melt. The temperature of the extruder is generally controlled at 280-300°C, and the pressure is controlled at 10-15MPa.

3. Spinning
The
melt is passed through a spinneret in a spinning beam to form a strand. The aperture size of the spinneret has an important influence on the fineness of the filament. In the spinning process, it is necessary to control the temperature, aperture size and spinning speed of the spinneret to ensure the quality and output of the filament.

4. Stretching

The spun strands are stretched by a stretcher to increase their orientation and strength. The stretching ratio is generally controlled at 3-5 times, and the stretching temperature is controlled at 70-90°C.

5. heat setting

after stretching silk into the heat setting zone, through high temperature setting, the internal molecular structure of silk stable. The heat setting temperature is generally controlled at 180-220°C, and the setting time is determined according to the specifications and quality requirements of the silk strip.

6. Winding
After
and shaping, the filament is wound into a bobbin by a winding machine to obtain a semi-matting POY product. In the winding process, it is necessary to control factors such as winding tension and winding speed to ensure the forming quality and output of the bobbin.

4. equipment selection

manufacturing semi-extinction POY need to use extruder, spinning machine, stretching machine, heat setting machine and winding machine and other equipment. When selecting equipment, factors such as equipment performance, stability, and reliability should be considered to ensure the smooth progress of the production process and the stability of product quality.

5. Quality Control

In the process of manufacturing semi-extinction POY, strict quality control is required for each link, including raw material quality, production process parameters, product quality and other aspects of the control. At the same time, it is also necessary to establish a complete quality inspection system to comprehensively monitor the production process to ensure that the product quality meets relevant standards and customer requirements.

6. conclusion The manufacturing method of

semi-extinction POY involves many links and factors, and it is necessary to strictly control the quality of raw materials, production process parameters and equipment performance to ensure the stability of product quality and improve production efficiency. At the same time, it is also necessary to strengthen quality management and technological innovation, and continuously improve the manufacturing level and product quality to meet the needs of the market and customers.

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