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[Chemical Knowledge]：Manufacturing methods and processes for downstream products

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In the field of chemical production raw materials, the manufacturing methods of downstream products are diverse, depending on the specific properties and applications of the desired products. This article will introduce a common downstream product-polyethylene (PE) film manufacturing method. Polyethylene film has excellent chemical resistance, electrical insulation and moisture resistance, and is widely used in packaging, agriculture, electronics, construction and other fields.

1. Raw Material Preparation

1. Polyethylene Resin: Select polyethylene resin with appropriate molecular weight and molecular structure as the main raw material.
2. Additives: As required, add auxiliary materials such as antioxidants, light stabilizers, lubricants, etc. to improve film properties.

2. ingredients mixing

1. Polyethylene resin and additives are added to a high-speed mixer in a certain proportion.
2. At a certain temperature and speed, the components are fully mixed.

3. Extrusion Pelletizing

1. Add the mixed raw materials to a single screw or twin screw extruder.
2. During the extrusion process, the raw materials are subjected to high temperature and shear, and gradually melt and plasticize.
3. through the die extrusion molding, and then by water cooling solidification, cut into a certain length of pellets.

4. Film Blowing

1. The pellets obtained by extrusion pelletization are charged into the hopper of a film blowing machine.
2. After the pellets are heated and melted, a tubular film blank with a certain thickness is formed through a die.
3. High-pressure air inflates the film blank, while the film blank is continuously stretched under the action of traction to form a thin film.
4. The film is cooled and shaped by the cooling air ring, and finally wound into a roll by the winding device.

5. quality testing and slitting packaging

1. after the winding film quality testing, including thickness, strength, transparency and other indicators.
2. According to customer needs, cut the film into different widths and lengths and pack them.

Through the above steps, we can manufacture high-quality polyethylene film. However, actual operation needs to be adjusted and optimized according to specific equipment and process conditions to ensure production efficiency and product quality. At the same time, the production process needs to pay attention to safety and environmental protection, comply with relevant laws and regulations.

In summary, manufacturing methods for downstream articles need to be selected and optimized based on product characteristics and uses. The manufacturing method of polyethylene film introduced in this paper is only one of them, and it needs to be adjusted and improved in the actual production.

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