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[Chemical Knowledge]：Production and manufacturing method and process flow of polyester full-extinction POY

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The manufacturing method
of polyester full extinction POY
Polyester full extinction POY is an important chemical raw material, widely used in textile, chemical fiber and other industries. This article will introduce the manufacturing method of polyester full-extinction POY, including raw material preparation, polymerization, spinning, drafting, winding and other processes.

1. raw material preparation

manufacturing polyester full extinction POY's primary task is to prepare raw materials. The main raw materials are purified terephthalic acid (PTA) and ethylene glycol (EG). These two kinds of raw materials are mixed according to a certain molar ratio, and polyester chips are produced by esterification reaction.

2. Polymerization

Polyester chips need to undergo a polymerization reaction. In the polymerization reaction, PTA and EG undergo a polycondensation reaction under the action of a catalyst to produce polyester chips. The polymerization reaction generally adopts a continuous polymerization method, and the reaction temperature and pressure need to be strictly controlled to ensure the molecular weight and molecular weight distribution of the chips.

3. Spinning

polyester chips are dried, melted, and extruded into filaments through a spinneret in a spinning box. The aperture size of the spinneret determines the fineness of the filament. During the spinning process, it is necessary to control the temperature of the melt, the pressure and the aperture of the spinneret to obtain uniform filaments.

4. Drawing
After the
strand is extruded from the spinneret, it needs to be drawn to increase its strength and fineness. The drafting process generally adopts a multi-stage drafting method, and gradually achieves the required fineness and strength by gradually increasing the drafting ratio. During the drafting process, it is necessary to control the drafting speed and tension to avoid wire breakage or deformation. The

5. winding

the drawn wire rod needs to be wound for subsequent processing and use. The winding process generally uses a high-speed winding machine, winding the wire into a certain shape and specifications of the reel. In the winding process, it is necessary to control the winding tension and speed to ensure the winding quality and wire performance.

above is the manufacturing method of polyester full extinction POY. In the manufacturing process, it is necessary to strictly control the process parameters and quality indicators of each process to ensure the quality and performance of the final product. At the same time, it is also necessary to strengthen the health and safety management of the production site to ensure the smooth progress of the production process.

6. quality control

In the manufacturing process of polyester full extinction POY, quality control is a crucial link. In order to ensure the stability and reliability of product quality, it is necessary to carry out strict quality inspection and control for each process. Specifically, it is necessary to monitor and adjust the quality of the raw materials, the conditions of the polymerization reaction, the temperature, pressure and the diameter of the spinneret during the spinning process, the speed and tension during the drafting process, the tension and speed during the winding process and other parameters in real time. In addition, it is necessary to carry out quality inspection on the produced polyester full extinction POY to ensure that it meets the relevant standards and customer requirements.

7. environmental protection and sustainable development

Polyester full extinction POY manufacturing process will produce a certain amount of waste gas and wastewater, causing a certain impact on the environment. Therefore, in the manufacturing process, it is necessary to strengthen environmental management, take effective measures to reduce the discharge of waste gas and waste water, and reduce the impact on the environment. At the same time, it is also necessary to actively promote the concept of sustainable development, adopt environmentally friendly materials and processes, improve the efficiency of resource utilization, and achieve the coordinated development of economic and environmental benefits.

In short, the manufacturing method of polyester full-extinction POY needs to comprehensively consider the process parameters and quality indicators of raw material preparation, polymerization, spinning, drafting, winding and other processes, and strengthen quality control and environmental protection management to achieve high-quality products. Efficient and environmentally friendly production.

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