Causes and Solutions of PVC Injection Molding Defects (Part 3) - Guangyuan Ruifeng New Materials

Category: PVC products

Release Time: 2020-07-28

Summary: (1) Injection pressure is too high, it should be lowered appropriately. (2) Holding pressure time is too long, it should be shortened appropriately. (3) Mold temperature is too low, it should be increased appropriately. (4) Ejection device setting is unreasonable, the ejection cross-sectional area and ejection points should be increased as much as possible. (5) Demolding slope is insufficient, it should be increased appropriately. (6) Melt temperature is too low, the barrel temperature should be increased appropriately.

9. Surface scratches

(1) Injection pressure is too high, it should be lowered appropriately. (Environmentally friendly crosslinking agent, environmentally friendly plasticizer, PVC bonding promoter)

(2) Holding pressure time is too long, it should be shortened appropriately.

(3) Mold temperature is too low, it should be increased appropriately.

(4) The ejection device is not set reasonably, the ejection cross-sectional area and ejection points should be increased as much as possible.

(5) The demolding slope is insufficient, it should be increased appropriately.

(6) The melt temperature is too low, the barrel temperature should be increased appropriately.

10. Poor gloss

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

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

(3) The mold temperature is too low, it should be increased appropriately.

(4) The size of the gating system structure is too small, the cross-section of the gate and runner should be appropriately enlarged.

(5) Poor mold venting, increase mold venting.

(6) Foreign matter and impurities are mixed in the raw materials, they should be removed or the raw materials should be replaced.

(7) Too much release agent is used, the amount should be reduced as much as possible.

(8) The screw back pressure is too low, it should be increased appropriately.

(9) Poor drying of raw materials, the raw materials should be subjected to drying and heat treatment.

11. Uneven color

(1) The barrel 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 raw materials are not colored evenly, the raw materials should be colored evenly. (Environmentally friendly crosslinking agent, environmentally friendly plasticizer, PVC bonding promoter)

12. Surface discoloration

(1) The melt temperature is too high, the molding temperature should be lowered appropriately.

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

(3) The size of the gating system structure is too small, the cross-section of the gate and runner should be appropriately enlarged.

(4) Poor mold venting, increase mold venting.

(5) Foreign matter and impurities are mixed in the raw materials, they should be removed or the raw materials should be replaced.

(6) The screw back pressure is too high, it should be lowered appropriately.

(7) The injection speed is too fast, it should be slowed down appropriately.

13. Delamination

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

(2) The injection speed is too fast, it should be slowed down appropriately.

(3) Foreign matter and impurities are mixed in the raw materials, they should be thoroughly removed or new materials should be used.

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

14. Warping and deformation

(1) The melt temperature is too low, the barrel temperature should be increased appropriately.

(2) The molding cycle is too short, it should be extended appropriately.

(3) The injection pressure is too high, it should be lowered appropriately.

(4) The injection speed is too fast, it should be slowed down appropriately.

(5) The holding pressure time is too long, it should be shortened appropriately.

(6) The mold temperature is too high, it should be lowered appropriately.

(7) The gate cross-sectional size is too large, it should be reduced appropriately.

(8) The ejection device is not set reasonably, the ejection cross-sectional area and ejection points should be increased as much as possible. (Environmentally friendly crosslinking agent, environmentally friendly plasticizer, PVC bonding promoter)

(9) The mold strength is insufficient, the mold rigidity should be improved as much as possible.

(10) The mold cooling system is improperly set, the design should be adjusted to keep the temperature of each part of the mold uniform.

15. Poor demolding

(1) The supplementary material time is too long, it should be shortened appropriately.

(2) The injection pressure is too high, it should be lowered appropriately.

(3) The cooling time is too long, it should be shortened appropriately.

(4) Too much material is supplied, it should be reduced appropriately.

(5) The mold temperature is too high, it should be lowered appropriately.

(6) Poor mold venting, increase mold venting.

(7) The ejection device is not set reasonably, the ejection cross-sectional area and ejection points should be increased as much as possible.

(8) The mold strength is insufficient, the mold rigidity should be improved as much as possible.

(9) The demolding slope of the mold is insufficient, it should be increased appropriately.

(10) The product shape structure is too complex, it should be adjusted if possible. (Environmentally friendly crosslinking

Keywords: Causes and Solutions of PVC Injection Molding Defects (Part 3) - Guangyuan Ruifeng New Materials

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