Flash and Burrs:
When the molten material enters the gaps between the mold parting surfaces or the joints between the mold and the slider, excess thin fins or burrs appear on the molded part.
| 4.1 Causes | 4.2 Solutions |
|---|---|
| 4.1.1 Poor closing or misalignment at the parting surface. | 4.2.1 Increase clamping force; repair the mold parting surface to ensure tight fitting. |
| 4.1.2 Excessive clearance between the cavity and core sliding parts. | 4.2.2 Polish and fit the sliding parts of the cavity and core to ensure close contact. |
| 4.1.3 Insufficient mold strength or rigidity causes local deformation under cavity pressure, creating gaps. | 4.2.3 Adjust process parameters to reduce cavity pressure; if severe, remake the mold or improve mold material and structure. |
| 4.1.4 Poor mold parallelism or mold deformation. | 4.2.4 Repair or remake the mold to ensure proper parallelism. |
| 4.1.5 Uneven filling due to one-sided mold clamping or improper installation pressure. | 4.2.5 Reinstall and properly secure the mold; repair gates as needed. |
| 4.1.6 Unbalanced filling in multi-cavity molds due to improper gate size. | 4.2.6 Adjust gate sizes according to product structure and runner length to achieve uniform filling. |
| 4.1.7 Injection speed too high, holding pressure too large, or holding time too long. | 4.2.7 Reduce injection speed, holding pressure, and holding time. |
| 4.1.8 Injection pressure too high, insufficient clamping force, or misaligned mold plates. | 4.2.8 Adjust injection pressure and clamping force; correct clamping system and ensure mold plates are parallel. |
| 4.1.9 Projected area of the molded part exceeds the machine’s clamping capacity. | 4.2.9 Use an injection molding machine with a larger clamping area. |
| 4.1.10 Plastic material has excessively high flowability, or melt/mold temperatures are too high, and injection speed is too fast. | 4.2.10 Use material with suitable flowability or adjust melt temperature, mold temperature, and injection speed. |
| 4.1.11 Excessive feeding amount. | 4.2.11 Adjust to a proper feeding amount. |
| 4.1.12 Foreign objects on mold surface. | 4.2.12 Clean the parting surface thoroughly. |
| 4.1.13 Mold temperature too high. | 4.2.13 Adjust mold temperature; check heater, thermocouple, and temperature controller settings in hot runner molds. |
| 4.1.14 Damage on the mold parting surface or cavity. | 4.2.14 Repair the damaged areas of the mold. |
| 4.1.15 Excessive temperature inside the hot runner. | 4.2.15 Lower the hot runner temperature. |
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