Injection Molding
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Low weld line strength of PBT reinforced material injection molded parts
Problem Phenomenon
The strength of PBT reinforced products at the weld lines is significantly lower than that of the body, and they easily break there.
Cause Analysis
The glass fiber at the weld lines is oriented perpendicular to the flow direction and cannot transmit load; the temperature of the two melt fronts is low and the fusion is poor.
Solution
Raise the melt temperature and mold temperature; increase the injection speed; optimize the gate position to move the weld lines out of the high-stress area.
Key Takeaway
The low weld line strength of PBT reinforced materials is an inherent weakness caused by glass fiber orientation.
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