Solution

During the plastic blow molding process, there may be some impurities in plastic materials such as PE, PVC, PP, and PET, such as metal, wood chips, sand, and fiber, which will affect the quality and appearance of the product. Therefore, filtering the plastic through a melt filter can improve the quality and appearance of the product. The specific necessity is as follows:

1. Improve the transparency of the product: In the processing of transparent plastics such as PET, if there are impurities, the product will be opaque, atomized, and other problems. Filtering through a melt filter can effectively improve the transparency of the product.
2. Improve the strength of the product: In the processing of plastics such as PE, PVC, and PP, if there are impurities, the strength of the product will decrease. Filtering through a melt filter can effectively improve the strength of the product.
3. Improve the surface finish of the product: In the plastic processing process, if there are impurities, the surface of the product will have defects, bubbles, and other problems. Filtering through a melt filter can effectively improve the surface finish of the product.
4. Extend the service life of the equipment: In the plastic processing process, if there are impurities, the equipment will be aggravated. Filtering through a melt filter can effectively extend the service life of the equipment.

Therefore, filtering plastics through melt filters can improve the quality and appearance of products and extend the service life of equipment, which is an essential step in the plastic processing process.