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Wrinkles / Halo at Gate:
When molten resin enters the mold cavity, it suddenly cools near the gate, increasing in viscosity and slowing its flow. Subsequent resin with lower viscosity and higher flow rate quickly fills the cavity. The difference in viscosity between the first-cooled and later-flowing resin causes visible marks where they meet near the gate.
| 13.1 Causes | 13.2 Solutions |
|---|---|
| 13.1.1 Low mold temperature. | 13.2.1 Increase mold temperature. |
| 13.1.2 Low nozzle temperature. | 13.2.2 Increase nozzle temperature. |
| 13.1.3 Poor material fluidity. | 13.2.3 Use material with better fluidity. |
| 13.1.4 Injection speed too fast or too slow. | 13.2.4 Adjust injection speed appropriately. |
| 13.1.5 Small gate or improper cold slug well. | 13.2.5 Enlarge gate, adjust cold slug well position and size. |
| 13.1.6 Low melt temperature. | 13.2.6 Increase melt temperature. |
| 13.1.7 High screw speed, low back pressure. | 13.2.7 Reduce screw speed, increase back pressure. |
| 13.1.8 Rough mold cavity surface. | 13.2.8 Polish the mold cavity. |
| 13.1.9 Material not properly dried. | 13.2.9 Dry the material. |
| 13.1.10 Low hot runner temperature. | 13.2.10 Increase hot runner temperature. |
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