Processing Machinery
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Warpage directionality of glass fiber reinforced PP
Problem Phenomenon
The warpage direction of glass fiber reinforced PP products is consistent with the fiber orientation, and pure resin process adjustment has poor effect.
Cause Analysis
The glass fibers orient along the flow direction; the shrinkage rate in the orientation direction is greatly reduced while the shrinkage in the perpendicular direction is large, and the anisotropic difference causes directional warpage.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Optimize the gate position to balance fiber orientation; ②use multi-point gates to shorten the flow path; ③increase the mold temperature to reduce the temperature difference; ④select a low-warpage grade when necessary.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
The core of reinforced PP warpage is fiber orientation management; gate design is the first means, and the material grade is the fallback solution.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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