Molding Process
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PBT glass fiber reinforced warpage
Fenómeno do problema
Glass fiber reinforced PBT products warp and deform, with the direction consistent with 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; PBT itself has a large molding shrinkage, and the anisotropy difference after reinforcement causes warpage.
Solução
①Optimize gate position to balance fiber orientation; ②use multi-point gates; ③increase mold temperature to reduce temperature difference; ④select low-warpage or glass bead mixed filling grades.
Conclusão principal
PBT reinforced warpage is a typical manifestation of shrinkage anisotropy; gate design and filler form (fiber changed to beads) are the main countermeasures.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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