Adhesion problems in plastic injection molding occur when the part is difficult to eject from the mold or sticks to its surface. This issue can stem from mold design, process settings, raw material, and surface condition. With proper analysis, both production errors and cycle losses can be reduced.
How to solve adhesion problems?
1. Use of appropriate mold release agents
- High-quality mold release agents suitable for the process should be preferred
- Silicone-free release agents should be used for parts to be painted
- Instead of excessive use, thin and controlled application should be performed
2. Mold surface cleaning
- Carbon, resin, and oil residues should be cleaned
- Dirty surfaces can cause the part to stick
- Vent channels should be kept open
3. Optimization of mold temperature
- Excessively high mold temperature can increase adhesion
- Balanced temperature distribution should be ensured
4. Adjustment of injection parameters
- Excessive injection pressure and holding pressure should be reduced
- Cooling time should be sufficient
- An overly compressed part can stick to the mold
5. Mold surface quality
- Scratched or worn surfaces increase adhesion
- Polishing and surface maintenance procedures should be applied
6. Design and draft angle control
- Insufficient draft angle makes part ejection difficult
- An appropriate draft angle should be provided
7. Raw material control
- Moist or degraded plastic material can cause surface problems
- Proper drying and process temperature should be applied
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