Blow Molding
4 조회수
Blow-Out/Blow-Crack of High-Density Polyethylene Blow Molded Products
문제 현상
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.
원인 분석
（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
해결 방법
（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
핵심 요약
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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