Molds & Tooling
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GF-PC Warpage (Fiber Orientation)
Problem Phenomenon
Glass fiber reinforced PC structural parts warp, cooling adjustment is not obvious, and repeatability is strong.
Cause Analysis
Fiber orientation along the flow direction causes directional shrinkage differences; the gate position determines the orientation pattern; GF-PC warpage is orientation-type warpage jointly determined by material and gate.
Solution
①Optimize gate position/number; ②Moldflow analysis of fiber orientation; ③Balance holding pressure and cooling; ④Adjust wall thickness distribution when necessary; ⑤Evaluate low-warpage grades.
Key Takeaway
For GF-PC warpage, 'first look at the fiber orientation map': gate design is the breakthrough point; orientation-type warpage has a fixed direction, pressing it hard with cooling is ineffective, it must be adjusted from the orientation source.
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