Molding Process
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PBT Glass Fiber Reinforced Warpage Mechanism
Problem Phenomenon
Glass fiber reinforced PBT products warp and deform, longitudinal and transverse shrinkage are inconsistent, and assembly is difficult
Cause Analysis
Glass fibers orient in the flow direction and restrict resin shrinkage, and PBT induces crystallization around the glass fibers, strengthening this effect; the non-uniform shrinkage with longitudinal shrinkage smaller than transverse causes warpage
Solution
①Increase mold temperature and injection cycle to improve; ②Optimize gate position for fiber orientation; ③For severely warped parts evaluate material-side anti-warpage solutions; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The essence of PBT/GF warpage is fiber orientation plus induced crystallization; when process improvement is limited, material-side anti-warpage formulation is the radical cure route; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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