Molds & Tooling
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PVDF Shrinkage Directional Differences and Dimensional Design
Fenómeno del problema
【Problem phenomenon】PVDF products have inconsistent shrinkage in flow and transverse directions, round parts lose roundness, and flat plates warp
Análisis de la causa
2-3% high shrinkage superimposed with crystalline orientation makes shrinkage show directional differences; uneven mold temperature further amplifies the bidirectional dimensional difference; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solución
Compensate the mold by directional measured shrinkage differences; homogenize mold temperature; glass fiber reinforced grades can reduce and homogenize shrinkage but chemical resistance changes must be verified; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
High shrinkage plus directional differences; PVDF mold compensation must use directional measured values; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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