Blow Molding
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Blow-Out/Blow-Crack of High-Density Polyethylene Blow Molded Products
Fenómeno do problema
During the blow '2079851475616104453, the parison is blown out, and holes or cracks appear in the product.
Blow-out causes product scrapping and is usually caused by excessive blowing air pressure or parison quality problems.
Análise das causas
（1）The blowing air pressure is too large, exceeding the bearing capacity of the parison
（2）The parison wall thickness is uneven, and the thin-walled parts are blown out first
（3）The parison temperature is too low, and the ductility is poor
（4）The blowing speed is too fast, and the parison has no time to deform uniformly
（5）There are impurities or bubbles in the parison as weak points
Solução
（1）Appropriately reduce the blowing air pressure to 0.3-0.6MPa
（2）Enable parison wall thickness control to ensure uniform wall thickness
（3）Appropriately increase the extrusion temperature to a reasonable value within the 180-260°C range
（4）Adopt a staged blowing method of pre-blowing + high-pressure blowing
（5）Check the cleanliness of the raw material and remove impurities
Conclusão principal
Blow-out is caused by excessive blowing air pressure or poor parison quality, and the blowing process and parison quality need to be optimized.
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