Before mixing, PE and EVA are dried to remove moisture and volatile substances in them to ensure that the mixed material has uniform properties. Use efficient mixing equipment to mix PE and EVA according to a determined ratio to ensure that the mixed material has uniform composition and properties.
During the melt extrusion process, the temperature of the extruder needs to be strictly controlled. Too low temperature will cause the raw materials to not be completely melted, affecting the softness and elasticity of the film; too high temperature may cause the raw materials to decompose, produce odor and reduce performance. Choose a screw design suitable for the PE and EVA mixture to ensure that the raw materials can be evenly melted and mixed during the extrusion process.
The blow-up ratio refers to the degree of expansion of the film during the blowing process. By adjusting the blow-up ratio, the thickness and stretching degree of the film can be controlled, thereby affecting its softness and elasticity. The traction speed determines the production speed and stretching degree of the film. Too fast traction speed may cause the film to be over-stretched, reducing softness and elasticity; too slow traction speed may cause the film to be too thick, affecting the use effect.
The cooling rate has an important influence on the softness and elasticity of the film. Too fast a cooling rate may increase the internal stress of the film, affecting its softness and elasticity; too slow a cooling rate may cause the film to stick or uneven thickness. During the cooling and setting process, the film can be further stretched and set using a setting device to improve its softness and elasticity.
During the heat setting process, the temperature and time need to be strictly controlled. Too high a temperature or too long a time may cause the film to soften or deform excessively; too low a temperature or too short a time may not achieve the expected setting effect. Select a suitable heat setting device and process parameters to ensure that the film can be heated evenly during the heat setting process and achieve the expected softness and elasticity.
Perform an appearance inspection on the produced film to ensure that its surface is flat, free of bubbles, cracks and other defects. Perform performance tests on the film such as softness, elasticity, strength, and heat resistance to ensure that it meets product standards and customer needs. Batch management of the produced film ensures that the quality and performance of each batch of products are consistent.
During storage, it is necessary to maintain a dry, ventilated, and light-proof environment to prevent the film from getting damp, aging or deforming. During transportation, it is necessary to choose appropriate transportation methods and packaging materials to ensure that the film is not damaged or deformed during transportation.