Causes and countermeasures of PVC injection molding product forming failures - Guangyuan Ruifeng New Materials

Category: PVC products

Release Time: 2020-07-28

Summary: The melt temperature is too low; the barrel and nozzle temperature should be increased appropriately. (Environmentally friendly crosslinking agent, environmentally friendly plasticizer, PVC adhesion promoter)

5. Weld lines

(1) The melt temperature is too low. The barrel and nozzle temperature should be increased appropriately. (Environmentally friendly crosslinking agent, environmentally friendly plasticizer, PVC adhesion promoter)

(2) The injection pressure is too low. It should be increased appropriately.

(3) The injection speed is too slow. It should be increased appropriately.

(4) The mold temperature is too low. It should be increased appropriately.

(5) The size of the gating system is too small. The cross-section of the gate and runner should be appropriately increased.

(6) Poor mold venting. Increase mold venting.

(7) Foreign matter and impurities are mixed in the raw materials. They should be removed.

(9) The amount of release agent or stabilizer is too high. Reduce the amount as much as possible.

(10) The raw materials are not colored evenly. Use a coloring agent with better dispersibility and extend the color mixing and stirring time.

(11) The cold slug well is too small or improperly positioned. Adjust it reasonably.

6. Flow lines

(1) The melt temperature is too low. The barrel and nozzle temperature should be increased appropriately.

(2) The injection pressure is too low. It should be increased appropriately.

(3) The holding time is too short. It should be extended appropriately.

(4) The mold temperature is too low. It should be increased appropriately.

(5) The size of the gating system is too small. The cross-section of the gate and runner should be appropriately increased.

(6) The cold slug well in the mold is too small. It should be enlarged appropriately.

(7) The cooling circuit in the mold is improperly set. Adjust the design to maintain a uniform temperature in all parts of the mold.

(8) The raw materials are not colored evenly. Use a coloring agent with better dispersibility and extend the color mixing and stirring time. (Environmentally friendly crosslinking agent, environmentally friendly plasticizer, PVC adhesion promoter)

7. Scorching and black streaks

(1) The melt temperature is too high. The barrel temperature should be lowered appropriately.

(2) The molding cycle is too long. It should be shortened appropriately.

(3) The injection speed is too fast. It should be slowed down appropriately.

(4) The screw back pressure is too high. It should be lowered appropriately.

(5) The gate cross-section is too small. It should be enlarged appropriately.

(6) Poor mold venting. Increase mold venting.

(7) The raw materials are not dried properly. Increase the drying temperature and extend the drying time.

(8) Too much release agent is used. Reduce the amount as much as possible.

(9) The injection pressure is too high. It should be lowered appropriately.

8. Silver streaks

(1) The melt temperature is too high. The barrel temperature should be lowered appropriately.

(2) The mold temperature is too low. It should be increased appropriately.

(3) Foreign matter and impurities are mixed in the raw materials. They should be removed.

(4) The raw materials are not dried properly. Increase the drying temperature and extend the drying time.

(5) The molding cycle is too long. It should be shortened appropriately.

(6) The injection speed is too fast. It should be slowed down appropriately.

(7) The injection deceleration is too small. It should be increased appropriately.

(8) The gate cross-section is too small. It should be enlarged appropriately.

(9) Poor mold venting. Increase mold venting.

(10) The raw materials are not dried properly. Increase the drying temperature and extend the drying time.

(11) The injection pressure is too high. It should be lowered appropriately. (Environmentally friendly crosslinking agent, environmentally friendly plasticizer, PVC adhesion promoter)

Keywords: Causes and countermeasures of PVC injection molding product forming failures - Guangyuan Ruifeng New Materials

Related Solutions

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