Polyethylene Film forming process

Polyethylene Film forming process

Polyethylene Film mainly has three kinds of heavy packaging film, general packaging film and agricultural film according to the application requirements.The molecular weight of the polyethylene resin is expressed by the magnitude of the melt index. The melt index is small, the molecular weight is high, and the tensile strength is also high. On the contrary, the melt index is large, the molecular weight is low, and the tensile strength is also low.

In the process of forming a Polyethylene Film, the uniformity of the annular gap of the machine head directly affects the uniformity of the thickness of the product. It has an important impact on the quality of the product. The die gap is generally 0.6~1mmm, and the annular gap of the die is adjusted by a steel feeler to ensure uniformity everywhere.

The temperature of the hopper should not be too high to prevent the particles from sticking. The temperature of the barrel can reach 180 °C. The temperature of the head can be 10-20 °C lower than the temperature of the fuselage. The molding temperature should not be too high or too low, so the film can not be fully plasticized. , and produce an irregular flow, which cannot be stretched and stretched smoothly.

Temperature control is the key in the Polyethylene Film process and an important parameter affecting quality. The advantage of this temperature control method is that the high temperature time experienced by the material is not easy to decompose, which can reduce the number of times of disassembling the machine head and improve the production capacity of the machine.

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