Processing Machinery
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PC Chemical Resistance Boundaries
Fenómeno do problema
[Problem Phenomenon] PC parts crack and swell after contact with chemicals
Análise das causas
PC is resistant to dilute acids, oils and aliphatic hydrocarbons, but not resistant to alkalis, ketones, esters, aromatic hydrocarbons, chlorinated hydrocarbons and ammonia; selection ignoring the boundaries leads to failure; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solução
Check against the media list; avoid alkali, ketone, ester and aromatic hydrocarbon environments; immersion verification at contact areas; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Conclusão principal
PC chemical resistance has forbidden zones; alkalis, ketones, esters and aromatic hydrocarbons must be avoided; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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