Dimensional Instability:
This occurs when the molded part exhibits inconsistent shrinkage due to poor mold manufacturing accuracy, unstable injection molding process conditions, or improper post-processing of the product.
| 7.1 Causes | 7.2 Solutions |
|---|---|
| 7.1.1 Unstable electrical or hydraulic system of the machine. | 7.2.1 Check for faults in electrical components or hydraulic systems; regularly clean electrical parts and replace hydraulic oil periodically. |
| 7.1.2 Unstable molding conditions or inconsistent molding cycles. | 7.2.2 Record and monitor process parameters to maintain stable molding cycles. |
| 7.1.3 Insufficient mold strength; positioning pins are bent or worn. | 7.2.3 Ensure sufficient mold strength; repair the mold and replace worn parts promptly. |
| 7.1.4 Insufficient mold strength causes unstable movement or inaccurate positioning of moving parts. | 7.2.4 Repair the mold to ensure stable motion and accurate positioning of moving components. |
| 7.1.5 Unstable mold clamping—sometimes loose, sometimes tight—leading to flash. | 7.2.5 Check mold clamping conditions and ensure no gaps in mold fitting areas. |
| 7.1.6 Gate size too small or uneven; unbalanced cavity filling. | 7.2.6 For multi-cavity molds, ensure uniform runner and gate dimensions and even cooling performance in all cooling channels. |
| 7.1.7 Uneven plastic pellets or inconsistent feeding amount. | 7.2.7 Ensure uniform pellet quality and consistent feeding volume. |
| 7.1.8 Insufficient cooling time; uneven cooling after demolding. | 7.2.8 Ensure adequate cooling time both in-mold and after demolding to achieve consistent shrinkage. |
| 7.1.9 Improper ratio of recycled to virgin material. | 7.2.9 Adjust the mixing ratio according to specifications. |
| 7.1.10 Unstable crystallinity in crystalline materials. | 7.2.10 Maintain stable mold temperature when using crystalline materials to ensure uniform crystallization. |
| 7.1.11 Poor part rigidity or uneven wall thickness. | 7.2.11 Adjust part design to achieve uniform wall thickness or add reinforcing ribs. |
| 7.1.12 Unstable post-processing conditions. | 7.2.12 Maintain consistent post-processing temperature and time. |
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