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S-shaped Flow Marks (Snake Marks / Jetting):
This defect occurs when the molten resin injected from the gate into the mold cavity solidifies on the surface of the molded part in a serpentine, snake-like pattern.
| 12.1 Causes | 12.2 Solutions |
|---|---|
| 12.1.1 Improper gate location, e.g., a direct gate allows molten resin to enter the cavity in a snake-like pattern and solidify quickly without resistance. | 12.2.1 Change the gate location and design so that the melt does not enter the cavity directly but flows in after being resisted. |
| 12.1.2 Runner system too long, causing material to cool too quickly. | 12.2.2 Shorten the runner system. |
| 12.1.3 Low mold or melt temperature. | 12.2.3 Properly increase mold and melt temperatures. |
| 12.1.4 Improper cold slug well position. | 12.2.4 Adjust the position and shape of the cold slug well. |
| 12.1.5 Low injection pressure or low injection speed. | 12.2.5 Increase injection pressure and speed. |
| 12.1.6 Low hot runner temperature. | 12.2.6 Increase hot runner temperature. |
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