Extrusion & Post
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PA66 annealing treatment application
Problem Phenomenon
Thin-walled parts molded at low mold temperature drift in dimension over time, clearance changes after assembly
Cause Analysis
When mold temperature is below 40℃, PA66 thin-walled parts' crystallinity continues to change over time, dimensions unstable long-term; annealing promotes completion of crystallization, locking dimensions in a stable state
Solution
①Anneal low-mold-temperature thin-walled parts to stabilize dimensions; ②annealing temperature below the heat deflection temperature; ③slow cooling after annealing to prevent new stress; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Annealing is dimensional insurance for low-mold-temperature PA66 parts; if high mold temperature can solve it, annealing is unnecessary, but when low mold temperature is required, annealing cannot be omitted; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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