Molds & Tooling
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PA66 glass fiber warpage (GF30)
Problem Phenomenon
GF-PA66 structural parts warp, cooling adjustment ineffective, highly repeatable.
Cause Analysis
Fiber orientation shrinkage difference; gate position determines orientation; GF30 is a commonly used reinforced specification with typical orientation warpage; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Adjust gate position/number to change melt flow direction and convergence position; ②use Moldflow etc. for fiber orientation and warpage analysis; ③balance holding pressure and time, taking into account both feeding and stress; ④verify fiber content and grade; ⑤symmetric structural design, avoid large flat surfaces and asymmetric rib positions.
Key Takeaway
GF-PA66 warpage='orientation problem': the gate is the breakthrough point; warpage of reinforced nylon must be treated at the fiber orientation source, hard pressing by cooling is ineffective; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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