Analysis of the causes of swelling and bubbling of injection molded products
Some plastic components may experience swelling or bubbling shortly after being removed from the mold, especially around metal inserts or in areas with thick walls. This issue typically occurs when the plastic hasn’t fully cooled or solidified, leading to gas expansion due to internal pressure.
**Possible Causes:** - Inadequate cooling time during the molding process. - Excessive material temperature or improper drying. - High injection speed or excessive flow resistance. - Improper holding pressure or insufficient packing time. - Uneven wall thickness or design flaws in the part.
**Solutions to Prevent Swelling and Bubbling:** 1. **Improve Cooling Efficiency**: Lower the mold temperature, increase the cooling time, and ensure proper material drying before processing. 2. **Adjust Injection Parameters**: Slow down the injection speed, shorten the cycle time if possible, and reduce flow resistance by optimizing gate design. 3. **Increase Holding Pressure and Time**: This helps maintain consistent pressure during the cooling phase, reducing internal voids and bubbles. 4. **Optimize Part Design**: Avoid sudden changes in wall thickness and ensure even material distribution throughout the component. 5. **Use Proper Material Selection**: Choose materials that are suitable for the specific application and have good thermal stability.
By addressing these factors, manufacturers can significantly reduce the occurrence of swelling and bubbling in injection-molded parts. For more detailed guidance or technical support, feel free to contact us at 13711965595.
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