Molds & Tooling
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PA66 melt temperature upper limit
Problem Phenomenon
Melt temperature raised to 305℃ to improve filling, products brittle and gate yellowed
Cause Analysis
PA66 melt temperature over 300℃, degradation rate rises sharply, molecular weight drops rapidly, strength and toughness lost and color turns yellow; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Melt temperature controlled 270-295℃, upper limit 300℃; filling difficulties solved by increasing speed, mold temperature or changing the gate instead; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
300℃ is the PA66 melt red line, over-temperature machine adjustment is not worth the loss; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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