Blow Molding
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Wall thickness too thin at the mold closing line of general-purpose polyethylene blow molded products
Fenómeno do problema
The wall thickness of the blow molded product near the mold closing line is significantly thinner, with low strength and easy to crack from here.
The thin wall at the mold closing line affects the sealing and pressure resistance of the product.
Análise das causas
（1）The parison is excessively squeezed at the mold closing line
（2）The blow-up ratio is too large, and the inflation at the mold closing line is the most severe
（3）The venting at the mold closing line of the mold is poor, and the melt does not fit tightly
（4）The parison position is offset and not in the center of the mold
（5）The blowing air pressure is too large, and the mold closing line is over-stretched
Solução
（1）Adjust the parison wall thickness distribution, and appropriately thicken near the mold closing line
（2）Optimize the blow-up ratio to avoid being too large
（3）Set venting grooves or venting holes at the mold closing line of the mold
（4）Adjust the parison position to ensure it is in the exact center of the mold
（5）Appropriately reduce the blowing air pressure and blow in stages
Conclusão principal
The thin wall at the mold closing line is caused by parison squeezing or uneven inflation, and the parison wall thickness distribution and blowing process need to be optimized.
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