Material Drying
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PET Bottle Drop Rupture
Fenómeno do problema
Finished bottles crack at the bottom or body in drop tests, occasional bottle rupture and leakage during transportation, and the customer complaint rate increases.
Análise das causas
Improper bottom wall thickness stretch distribution forms weak zones, or PET becomes brittle due to high-temperature degradation and insufficient-drying hydrolysis; stress concentration at the bottle bottom corners also induces drop rupture.
Solução
①Optimize bottom stretch ratio and material distribution; ②strengthen raw '2079851475616104451 before preform injection; ③reduce processing temperature to reduce degradation; ④test bottle bottom thickness and IV value.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Drop performance is directly related to material toughness and wall thickness distribution; hydrolysis embrittlement and bottom weakness are the two major root causes, which need to be solved synergistically from drying, temperature and stretching process.
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