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[Chemical Knowledge]：Manufacturing method and process of polyester filament

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Manufacturing method
of polyester filament
polyester filament is a widely used chemical production raw material, with excellent physical and chemical properties, such as high strength, good elasticity, heat resistance, corrosion resistance and so on. Therefore, polyester filament has been widely used in textile, clothing, chemical and other fields. This article will introduce the manufacturing method of polyester filament.

1. raw material preparation

manufacturing polyester filament first need to prepare raw materials, mainly polyester chips and additives. Polyester chips are made from terephthalic acid and ethylene glycol through polycondensation reaction, and are the main raw materials for the manufacture of polyester filaments. Additives include antioxidants, lubricants, matting agents, etc., to improve the performance of polyester filaments.

2. Melt Extrusion

The polyester chips and additives are added to the extruder in proportion, and the raw materials are melted and mixed through heating and extrusion to form a uniform melt. The temperature of the melt is controlled between 280-300°C and the pressure is controlled between 10-15MPa. After the

3. spinning

melt extrusion, the melt enters the spinning box and the filaments are ejected through the spinneret. The diameter of the spinneret is generally between 0.2-0.5mm, and the number of holes is determined according to production needs. The ejected filaments are rapidly cooled and solidified in air to form nascent fibers.

4. drawing

the primary fiber through the guide wheel into the stretching zone, through the multi-stage stretching device to stretch, so that the fiber molecular orientation and crystallinity, fiber strength increased. The stretching ratio is generally between 3 and 5 times. The

5. the heat setting

the stretched fiber to enter the heat setting zone, and heat setting is carried out at a certain temperature and tension to stabilize the shape and size of the fiber. The heat setting temperature is generally between 180-220 ℃, and the time is determined according to the fiber variety and specifications.

6. Winding

The heat-set fiber is wound into a bobbin by a winding device to obtain a polyester filament product. The winding speed is generally between 1000-3000 m/min.

The above is the basic manufacturing method of polyester filament. The specific process parameters and operation process need to be adjusted according to the production equipment and product requirements. At the same time, in order to ensure product quality and production efficiency, the following points need to be paid attention to:

1. Strictly control the quality and ratio of raw materials to ensure stable melt quality of melt extrusion;
2. The aperture and number of holes of the spinneret need to be selected according to product specifications and production capacity;
3. The temperature and tension in the stretching and heat setting process need to be properly controlled to ensure product quality;
4. The winding speed needs to be adjusted according to equipment performance and product requirements to ensure production efficiency and product quality.

In short, the manufacture of polyester filament requires strict control of all process links to ensure product quality and production efficiency.

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