Processing Machinery
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PA66 high-temperature retention degradation
Fenómeno do problema
Products turn yellow and brittle when production resumes after a short shutdown.
Análise das causas
PA66 degrades noticeably after staying a few minutes near 290℃; shutdown without lowering temperature or emptying is the direct cause; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solução
①Lower temperature or empty as soon as shutdown exceeds the time limit; ②fully displace and flush with purging material before startup; ③select a matching small machine according to product weight to shorten residence time; ④monitor melt residence time to avoid exceeding limits; ⑤standardize shutdown SOP: lower temperature or empty as soon as the time limit is exceeded.
Conclusão principal
PA66 residence time='minute-level management': high-temperature nylon degrades after staying a few minutes; shutdown SOP is an iron rule for quality assurance and cannot be delayed; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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