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[Chemical Knowledge]：Manufacturing method and process flow of polyester staple fiber

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Manufacturing method
of polyester staple fiber
polyester staple fiber is a widely used raw material for chemical production, which has excellent performance and wide application. This article will introduce the manufacturing method of polyester staple fiber, including raw material preparation, polymerization reaction, spinning, stretching, heat setting and other steps.

1. raw material preparation

polyester staple fiber raw materials are mainly petrochemical products, such as ethylene, propylene and so on. First, these raw materials need to be processed to prepare monomers suitable for polymerization.

2. polymerization

polymerization is a key step in the manufacture of polyester staple fiber. In the polymerization reaction, a monomer is subjected to an addition polymerization reaction by an initiator to form a polymer compound. In order to obtain high-quality polyester staple fibers, it is necessary to control the polymerization conditions, such as temperature, pressure, and initiator dosage.

3. Spinning

After completion of the polymerization reaction, the resulting polymer compound needs to be spun. In the spinning process, the polymer compound is formed into filaments by the spinneret, and the filaments are solidified by the action of the cooling wind. The spinning process needs to control parameters such as the aperture of the spinneret and the speed of the cooling air to ensure the quality and output of the filaments.

4. Stretching
After
spinning is completed, the filaments need to be stretched to improve their strength and elasticity. During the stretching process, the filament is gradually stretched through multiple stretching rollers to achieve the desired strength and elasticity.

5. Heat-setting
After the
drawing is completed, the filament needs to be heat-set to make it have a stable shape and performance. During the heat setting process, the filaments pass through a high-temperature oven to rearrange the molecular chain segments, eliminate internal stress, and improve dimensional stability.

above is the manufacturing method of polyester staple fiber. In actual production, it is necessary to carefully adjust and optimize the process parameters of each step according to specific product requirements and production conditions to ensure product quality and production efficiency. At the same time, it is also necessary to pay attention to the safety and environmental protection issues in the production process to ensure that the production process meets the requirements of relevant regulations and standards.

In short, the manufacturing method of polyester staple fiber is a complex system engineering, which requires full consideration of raw materials, technology, equipment, operation and other factors. Only through continuous practice and summary can we continuously improve the manufacturing level of polyester staple fiber and contribute to the development of the chemical production field.

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