Processing Machinery
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PA66 product heat-resistance deformation
Problem Phenomenon
Short-term deformation in hot air environment, heat resistance not up to standard.
Cause Analysis
PA66 has good heat resistance but heat deflection temperature drops after water absorption; wet-state use overestimates heat resistance; water absorption rate is an invisible variable of heat resistance; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Design according to wet-state thermal performance data, reserving performance margin; ②select heat-resistant or hydrolysis-resistant modified grades; ③conduct hot-humid aging verification to evaluate long-term performance; ④do a good job of sealing and moisture-proofing, control environmental and storage humidity; ⑤control the use environment.
Key Takeaway
PA66 heat resistance 'check by wet state': heat deflection temperature drops after water absorption; dry-state data cannot be directly used for wet-state design, sufficient margin must be left; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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