Processing Machinery
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PA12 Thick-wall Part Surface Quality Optimization
Problem Phenomenon
【Problem phenomenon】PA12 thick-wall parts had sink marks and poor gloss on the surface, which became worse after raising the temperature
Cause Analysis
The surface quality of thick-wall non-reinforced PA12 can be improved by selecting a lower melt temperature; high melt temperature prolongs cooling and shrinkage time and instead aggravates sink marks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
For thick-wall parts, take the melt temperature at the lower limit of the window; extend holding pressure compensation and cooling time accordingly; strengthen cooling in the thick-wall area of the mold to equalize shrinkage; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Thick-wall PA12 surface quality relies on low temperature and slow cooling, and raising the temperature is going in the opposite direction; 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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