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I. Char particles on the surface of the tube – Causes: 1. Excessively high temperature of the machine body or nozzle. 2. The nozzle and filter plate were not cleaned thoroughly. 3. The design of the nozzle diverter is unreasonable, resulting in dead corners. 4. Poor thermal stability of the raw materials or insufficient stabilizing dosage. 5. Failure of the temperature control instrument. Solution 1: Lower the temperature or check if the thermometer is malfunctioning. 2. Clean up again. 3. Improve the head structure. 4. Check the formula and ingredients. 5. Inspect instruments. II. Black stripes on the surface of the tube – Causes: 1. Excessively high temperature of the fuselage and nose section. 2. The filter plate was not cleaned properly. Solution 1: Reduce the temperature of the fuselage or nose. 2. Re-clean. Please don’t get it wrong: Lol Boyang Pony specializes in PVC processing aids, not PVC products. In order to provide better service to PVC manufacturers, our technical team also conducts in-depth research on PVC products. Even for those who are not PVC manufacturers, our technical team still has an advantage. Boyang New Materials welcomes you. 3. The surface of the pipe lacks luster. Causes: 1. The temperature of the die is too low. 2. Excessively high die temperature results in a lack of luster and a rough surface. Solution 1: Increase the die temperature. 2. Reduce the die temperature. IV. Wrinkles on the surface of the tube – Causes: 1. Uneven temperature around the die. 2. The cooling water is too hot. 3. The pulling speed is too slow. Solution 1: Check the heating coil. 2. Increase the cooling water flow. 3. Increase traction speed. Changzhou Boyang New Materials specializes in the production of PVC processing aids, boasting a professional technical team. This technical article was carefully prepared by experienced craftsmen who have dedicated their entire careers to the PVC industry, with the aim of serving those working in the plastics sector. V. Rough inner wall of the pipe – Causes: 1. Low temperature of the core mold. 2. The aircraft body temperature is too low. 3. The screw temperature is too high. Solution 1: Increase the temperature of the core mold. 2. Increase the airframe temperature. 3. Lower the screw temperature. VI. Cracks on the inner wall of the pipe – Causes: 1. Impurities in the material. 2. The core mold temperature is too low. 3. The aircraft body temperature is low. 4. The pulling speed is too fast. Solution 1: Replace the raw materials free from impurities. 2. Increase the core mold temperature. 3. Increase the airframe temperature. 4. Slow down the traction speed. VII. Bubbles on the inner wall of the tube: Cause – material is damp. Solution: Produce after the materials are dried. VIII. Irregularities on the inner wall of the tube – Causes: 1. Excessively high temperature of the screw. 2. The screw speed is too high. Solution 1: Lower the screw temperature. 2. Reduce the screw speed. Boyang New Materials is not only focused on doing business but also on building friendships, in order to serve more plastic manufacturers. IX. Uneven wall thickness of the tube: Causes 1. The die and core mold are not aligned, resulting in a skewed tube. 2. The temperature of the nozzle is uneven, resulting in varying speeds of material output. 3. Abnormal traction slippage, with the pipe diameter varying constantly. 4. The compressed air and vacuum level are unstable. Solution 1: Readjust the mouth die to be concentric with the core die. 2. Check whether the heating coil is damaged. 3. Repair the traction equipment to ensure it functions properly. 4. Stabilize the compressed air and vacuum level. X. Pipe bending – Causes 1. Uneven wall thickness of the pipe. 2. Uneven temperatures around the nozzle cause uneven material output. 3. The centers of the cutting head, cooling water tank, traction cutting, and other equipment are not on the same straight line. Solution 1: Adjust the wall thickness of the pipe. 2. Check whether the heating coil is damaged. 3. Adjust the equipment’s straightness.