Black spots in PVC granules are mainly caused by **unclean screws, raw material contamination, carbonization from overheating, or poor environmental conditions**. Solutions include regularly cleaning the screw and die head, controlling temperature and residence time, inspecting raw materials, maintaining a clean production environment, cleaning auxiliary equipment and filters, and checking the heating system. These measures help prevent black spots and improve the appearance and quality of PVC granules.

The pvc pelletizing process is the process of measuring, sticking, plasticizing, and pelletizing high polymer resin with various additives and auxiliaries into pelletized plastics. Plastic pellets are semi-finished products in the plastic molding and processing industry and are also extruded. Injection molding, hollow blow molding, foaming and other molding processing raw materials. So, let's take a look at the principle and process technology of pvc pelletizing extruding machine?

With the hot plastic industry, the demand for pvc pelletizing machine is also increasing. Many companies have also begun to produce plastic pelletizing machines, which has led to a wide variety of pvc pelletizing machines on the market with uneven quality.

The technical support of pvc pelletizing is operated by a pvc pelletizing machine. Its main working method is wet pelletizing. A certain amount of water or steam is used to make the basic fertilizer fully chemically react in the cylinder after the humidity is adjusted.