Processing Machinery
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POM glass fiber reinforced aggravated warpage
Fenómeno do problema
Glass fiber reinforced POM products warp more severely than pure resin with obvious directionality, and the warpage direction is consistent with the glass fiber orientation.
Análise das causas
Glass fibers orient along the flow direction, with small shrinkage in the orientation direction and large shrinkage in the perpendicular direction, and anisotropic shrinkage causes warpage; the higher the fiber content, the stronger the directionality.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①Optimize the gate position to balance fiber orientation; ②increase mold temperature to reduce temperature differences; ③adjust the holding pressure curve; ④evaluate switching to a low-warpage grade.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
The core of reinforced POM warpage is fiber orientation anisotropy; gate design and mold temperature are the main means, and severe cases need to be solved at the material level.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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