The melting problem has been mentioned in the previous temperature control regulations. Generally, the poor melting is specifically manifested as: the extruded insulation layer has a toad skin; the plastic surface is black, dull, and has small cracks; the extruded insulation layer is in the process of bonding. There are significant seams on the glue; the key reasons are:
1. The temperature control is too low, especially the engine position;
2. Other plastic materials with different characteristics are stained in the insulating layer or sheath material;
3. The screw of the extruder rotates too fast, and the plastic cannot be completely melted;
4. The plastic itself has product quality problems.
For the above reasons, attention should be paid to the rationalization of extrusion temperature control; the quality of the raw materials and the product name should be determined; the extrusion rate cannot be increased by the pursuit of production; the storage of raw materials should be improved, especially in the plastic drying process; effective Match the mold to increase the working pressure of extrusion and the flow back of the extruder screw.
