B2B Internet for Chemical products

The manufacturing method of polyester film 

1. Introduction 

Polyester film is a polymer material widely used in chemical, electronic, food packaging and other fields, with excellent mechanical properties, thermal stability, electrical insulation, and chemical corrosion resistance. This article will introduce the manufacturing method of polyester film, including steps such as raw material preparation, polymerization reaction, melt extrusion, biaxial stretching, heat treatment, and winding

2、 The main raw materials for polyester film are terephthalic acid and ethylene glycol. Firstly, it is necessary to mix these two raw materials together in a certain molar ratio, then add auxiliary materials such as catalysts and stabilizers, stir evenly, and send them into the polymerization reactor

3、 Polymerization reaction 

In a polymerization reactor, the raw materials undergo esterification and condensation reactions under high temperature and pressure conditions to generate polyester polymers. This process requires controlling a certain reaction temperature and pressure to ensure the smooth progress of the reaction and the quality of the product

4、 After the polymerization reaction is completed, the obtained polyester polymer melt is extruded through the extruder head to form a certain thickness of sheet material. During the extrusion process, it is necessary to control the temperature, pressure, and flow rate of the melt to ensure the uniformity and surface smoothness of the sheet

5、 The extruded sheet is subjected to longitudinal and transverse stretching by a biaxial stretching machine to increase its strength and toughness. During the stretching process, it is necessary to control the stretching ratio and speed to ensure the mechanical properties and service life of the sheet

6、 Heat treatment is required for sheets that have undergone biaxial stretching to eliminate internal stress and improve dimensional stability. During the heat treatment process, temperature and time need to be controlled to ensure the performance and quality of the sheet

7、 Wrap the heat treated sheet to obtain the final polyester film product. During the winding process, tension and speed need to be controlled to ensure the quality and appearance of the product

8、 Quality control and testing 

In the production process, it is necessary to control and test the quality of raw materials, semi-finished products, and finished products to ensure that the quality of the products meets relevant standards and requirements. The testing items include physical properties, chemical properties, appearance quality, and other aspects

9、 Environmental protection and safety production 

During the production process of polyester film, attention should be paid to environmental protection and safety production. Effective measures need to be taken to reduce emissions of exhaust gas, wastewater, and solid waste, reduce energy and resource consumption, and improve production efficiency and economic benefits. At the same time, it is necessary to strengthen equipment maintenance and operation management to prevent the occurrence of safety accidents

10、 Conclusion: The manufacturing method of polyester film includes steps such as raw material preparation, polymerization reaction, melt extrusion, biaxial stretching, heat treatment, and winding. During the production process, attention should be paid to issues related to quality control and testing, environmental protection and safety production. By mastering appropriate manufacturing methods and control techniques, high-quality and high-performance polyester film products can be produced to meet the application needs of different fields.