Causes of swelling and bubbling of injection molded products
Some plastic parts swell or bubble on the back of the metal insert or in particularly thick areas very quickly after molding and demoulding. This is due to the fact that the plastic that has not been completely cooled and hardened expands by releasing gases under the action of internal pressure.
Solution(s):
- Effective cooling. Reduce the mold temperature, prolong the mold opening time, and reduce the drying and processing temperature of the material.
- Reduce the mold filling speed, reduce the forming cycle, and reduce the flow resistance.
- Increase the holding pressure and time.
- Improve the situation that the wall surface of the workpiece is too thick or the thickness changes greatly.
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injection mold
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swelling
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bubbling
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