Manufacturing method of semi-matte POY
I. INTRODUCTION
In the field of raw materials for the production of chemicals, semi-matte POY (partially oriented yarn) is an important chemical fiber product, which is widely used in the fields of textiles, nonwoven fabrics, and industrial yarns. Semi-matte POY is favored because of its advantages of high strength, high elasticity and low heat shrinkage. This paper will introduce the manufacturing method of semi-matte POY, including raw material selection, production process, equipment selection and other aspects.
Second, raw material selection
The first task of manufacturing semi-matte POY is to select suitable raw materials. Commonly used raw materials are polyester chips, titanium dioxide, oil and so on. Among them, polyester chips are the main raw materials, and their quality has an important impact on the performance of semi-darkening POY. Therefore, when choosing polyester chips, its viscosity, melting point, titanium dioxide content and other indicators should be considered.
Three, production process
1. Drying
Polyester chips need to be dried during the manufacturing process to remove the moisture in them. Generally, hot air drying or vacuum drying is used to control the moisture content in the chips below 0.005%.
2. Melt Extrusion
After drying, the polyester chips enter the extruder and are melted and extruded at a high temperature to form a melt. The temperature of the extruder is generally controlled at 280-300°C, and the pressure is controlled at 10-15 MPa.
3. Spinning
The melt passes through the spinneret inside the spinning chamber to form the filaments. The aperture size of the spinneret has an important influence on the fineness of the filament strip. During the spinning process, the temperature of the spinneret, the aperture size and the spinning speed need to be controlled to ensure the quality and yield of the tow.
4. Stretching
The spun tow is stretched by the stretching machine to increase its orientation and strength. The stretching times are generally controlled at 3-5 times, and the stretching temperature is controlled at 70-90℃.
5. Heat-setting
The stretched filament enters the heat-setting area, and the molecular structure inside the filament is stabilized through high temperature setting. The temperature of heat-setting is generally controlled at 180-220℃, and the time of setting depends on the specification and quality requirement of the filament. Winding
6. After sizing, the filaments are wound into tubes by the winding machine, that is to say, we get the semi-matte POY products. In the winding process, it is necessary to control the winding tension, winding speed and other factors to ensure the quality of the cylinder molding and yield.
Four, equipment selection
Manufacture of semi-matte POY need to use the extruder, spinning machine, stretching machine, heat-setting machine and winding machine and other equipment. When selecting equipment, the performance, stability, reliability and other factors of the equipment should be considered to ensure the smooth running of the production process and the stability of product quality.
V. Quality control
In the process of manufacturing semi-matte POY, it is necessary to carry out strict quality control of all aspects, including the quality of raw materials, production process parameters, product quality and other aspects of control. At the same time, it is also necessary to establish a perfect quality inspection system to monitor the production process comprehensively to ensure that the product quality meets the relevant standards and customer requirements.
VI.CONCLUSION
The manufacturing method of semi-matte POY involves a number of links and factors, and it is necessary to strictly control the quality of raw materials, production process parameters and equipment performance in order 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 to continuously improve the manufacturing level and product quality to meet the market and customer needs.
