Injection Molding
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PA66 injection pressure window
Problem Phenomenon
Insufficient pressure causes short shots, excessive pressure causes flash and mold expansion, and fluctuation is large within the 75-125MPa window
Cause Analysis
PA66 injection pressure is conventionally 75-125MPa, and glass fiber reinforced grades need to be increased by 20-30%; material batch, wall thickness, and flow length changes all change pressure demand, and fixed parameters cannot cover all
Solution
①Trial-mold and finalize within 75-125MPa according to product structure; ②Set reinforced grades at the upper limit; ③Use pressure-controlled transfer point for switchover to holding; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA66 pressure setting should be tailored to the part; trial-mold finalization plus scientific transfer points adapt to fluctuations better than empirical parameters; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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