Processing Machinery
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PC Stress Cracking by Solvents
Problem Phenomenon
[Problem Phenomenon] PC cracks after contact with solvents, with stress and solvent superimposed
Cause Analysis
PC is sensitive to solvents such as ketones, esters and aromatic hydrocarbons, and solvents induce cracking under internal stress (environmental stress cracking); this is the most typical PC 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
Solution
Check the solvent environment; anneal high-stress parts; select chemical-resistant grades or coatings for sensitive environments; 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
Key Takeaway
For PC stress cracking, look at solvents; annealing and material selection are the two countermeasures; 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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