Injection Molding
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Insufficient fiber retention length in the product
Fenómeno del problema
Inspection finds that the fiber length in the product is <0.5mm, far below the design target
Análisis de la causa
The shear in the screw mixing section is too strong, cutting the glass fibers; the shear rate at the runner/gate of the injection system is too high; the material is repeatedly cut through multiple thermal histories
Solución
Use a low-shear screw design (L/D=18-20, compression ratio 1.5-1.8); optimize runner and gate dimensions with smooth transitions to reduce shear rate; reduce screw speed
Conclusión clave
Fiber retention length is the primary factor determining the reinforcement effect
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