Extrusion & Post
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PET bottle drop pinhole leakage
Fenómeno do problema
After the bottle body is dropped or squeezed, pinholes that are hard to distinguish with the naked eye appear, causing slow leakage, which can be detected by a vacuum leak detector.
Análise das causas
Internal bubbles or black speck impurities in the preform form extremely thin areas during bottle blowing stretching, which rupture into pinholes upon impact; local excessive stretching also brings the wall thickness below the limit.
Solução
①Strengthen raw '2079851475616104451 to eliminate preform bubbles; ②reject preforms containing black speck impurities; ③optimize stretch distribution to avoid local excessive thinness; ④strengthen online leak detection.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Pinholes originate from defects inside the preform being magnified by stretching; drying and impurity removal are the fundamental prevention, and the leak detection process is indispensable for pressurized products such as carbonated beverages.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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