Molds & Tooling
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Excessive anisotropy of PBT reinforced products
Problem Phenomenon
The performance difference between the flow direction and the perpendicular direction of glass fiber reinforced PBT products is too large (>50%).
Cause Analysis
The glass fiber is highly oriented in the mold filling flow direction, causing anisotropy of mechanical properties; the product design and gate position are improper.
Solution
Optimize the gate position to make the glass fiber orientation distribution uniform; use mineral/glass fiber hybrid fillers to reduce anisotropy.
Key Takeaway
PBT anisotropy needs to be considered at the design stage.
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