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[Chemical Knowledge]：BOPP production and manufacturing methods and processes.

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BOPP (biaxially oriented polypropylene) film is an important chemical raw material, with excellent physical properties, chemical stability and processing performance, widely used in packaging, printing, electronics, agriculture and other fields. This article will introduce the manufacturing method of BOPP in detail.

1. raw material preparation

BOPP production raw material is mainly polypropylene resin, which requires high molecular weight, narrow molecular weight distribution and good processing performance. In addition, it is necessary to add some additives, such as antioxidants, antistatic agents, slip agents, etc., to improve the performance of the film.

2. Ingredients Mixing

Polypropylene resin and additives are added to a high-speed mixer according to a certain proportion, and are fully stirred and mixed to ensure the uniform distribution of raw materials.

3. extrusion casting

the mixed raw materials are melted and extruded through an extruder to form a sheet with a certain thickness. During the extrusion process, temperature, pressure and extrusion speed need to be controlled to ensure the quality and thickness uniformity of the sheet.

4. biaxial stretching

the extruded sheet to be biaxially stretched, I .e. stretched in the machine and transverse directions, to increase the strength and toughness of the film. The stretching process needs to be carried out under a certain temperature and tension to ensure the quality and performance of the film.

5. heat treatment

The stretched film needs to be heat treated to eliminate internal stress and improve the dimensional stability of the film. It is necessary to control the temperature and time during the heat treatment to avoid deformation or aging of the film.

6. winding and slitting

the heat-treated film for winding and slitting to obtain BOPP film products with a certain width and length.

In short, the manufacturing method of BOPP requires multiple steps, including raw material preparation, ingredient mixing, extrusion casting, two-way stretching, heat treatment and winding and cutting. Each step requires strict control of process parameters to ensure the quality and performance of the film. At the same time, it is also necessary to pay attention to the safety and environmental protection issues in the production process to avoid harm to the environment and personnel. In the actual production process of

, process optimization and adjustment need to be carried out according to specific product requirements and market demand to improve production efficiency, reduce costs, and improve product quality and competitiveness. In addition, with the continuous progress and application of science and technology, BOPP's manufacturing methods are constantly improving and innovating, injecting new impetus into the development of the industry.

In short, BOPP is an important raw material for chemical production, and its manufacturing method needs to be controlled and adjusted through multiple links and process steps to ensure product quality and performance. At the same time, it is also necessary to pay attention to the safety and environmental protection issues in the production process to promote the sustainable development of the industry.

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