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[Chemical Knowledge]：The production and manufacturing method and process of PE packaging film.

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The manufacturing method
of PE packaging film
1. Introduction

PE packaging film is a widely used chemical production raw material, because of its excellent durability, tear resistance, transparency and water resistance, is widely used in food, medicine, electronic products and other fields of packaging. This paper will introduce the manufacturing method of PE packaging film in detail, including the steps of raw material selection, ratio, mixing, extrusion, stretching, cooling and winding.

2. raw material selection and ratio
The main raw material for
PE packaging film is polyethylene resin. High density polyethylene (HDPE) or linear low density polyethylene (LLDPE) should be selected as the main material to improve the strength and toughness of the packaging film. According to need, some additives can be added, such as antioxidants, anti-ultraviolet agents, color agents, etc.
The ratio of
raw materials should be carried out according to the specific requirements of the product. Generally speaking, the ratio of HDPE and LLDPE can be between 70%-90%, and the ratio of additives should not exceed 10%.

3. Mixing

The well-proportioned raw materials are added to a mixer for high-temperature mixing. The purpose of kneading is to fully mix the raw materials, improve the uniformity of molecules, and at the same time make the additives uniformly dispersed in the polyethylene resin. The mixing temperature and time should be determined according to the performance of the equipment and the nature of the raw materials. Generally, the mixing temperature is 150-200 ℃, and the mixing time is 10-30 minutes. The

4. extrusion

adds the mixed material into the extruder, and extrudes the material into a film through the rotation and advancement of the screw. During the extrusion process, attention should be paid to controlling the extrusion speed, temperature and pressure to ensure uniform film quality and thickness. The extrusion temperature is generally 180-220°C and the pressure is 5-10MPa.

5. stretching

extruded films require a stretching process to increase their strength and toughness. Stretching can be unidirectional or bidirectional stretching, and the specific method should be selected according to the requirements of the product and the ability of the equipment. The draw ratio is generally between 2 and 5 times.

6. Cooling

The stretched film needs to be shaped by a cooling process to maintain its stretched state and properties. Cooling is generally air-cooled or water-cooled, and the cooling temperature should be controlled at 30-50°C to avoid internal stress and deformation of the film. The

7. winding

the cooled film is wound into a roll by the winding machine to complete the production process. During the winding process, attention should be paid to controlling the winding speed and tension to ensure that the film is wound neatly and without damage.

8. quality control

In the entire production process, it is necessary to strictly control the process parameters to ensure product quality. At the same time, it is necessary to carry out quality inspection on the produced products, including the detection of thickness, strength, toughness, transparency and other indicators.

9. environmental protection and sustainable development

should pay attention to environmental protection and sustainable development in the production process. Try to choose environmentally friendly raw materials and additives to reduce the discharge of waste and pollutants in the production process, while improving the energy efficiency and resource utilization of equipment.

10. conclusion The manufacturing method of

PE packaging film includes the steps of raw material selection, proportioning, mixing, extrusion, stretching, cooling and winding. In the production process, it is necessary to strictly control the process parameters to ensure product quality. At the same time, we should pay attention to environmental protection and sustainable development, and improve the energy efficiency and resource utilization of equipment. Through scientific manufacturing methods, high-quality and high-performance PE packaging films can be produced to meet the needs of different fields.

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