Processing Machinery
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ESCR stress cracking of PP products
Problem Phenomenon
PP containers in contact with detergents or oils develop cracks during use.
Cause Analysis
Although PP's stress cracking resistance is better than PE's, products with high internal stress still crack when contacting specific media; improper grade selection carries higher risk.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Reduce the internal stress of the product; ②select a stress-cracking-resistant grade; ③perform media compatibility verification; ④avoid sharp corner design.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
Products in contact with media must undergo ESCR verification; both a low-stress process and correct material selection are important.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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