Blow Molding
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HDPE '2079851475616104457 container melt fracture
Fenómeno del problema
The parison surface is rough like sharkskin, and the container surface becomes rough accordingly.
Análisis de la causa
Exit shear stress exceeds the critical value; low mold temperature and fast extrusion speed; more obvious when the regrind ratio is high.
Solución
①Change the extrusion pressure/speed; ②adjust the back pressure; ③reduce the regrind ratio; ④check the head heating band; ⑤increase the die temperature.
Conclusión clave
For rough parison, first adjust the pressure-temperature combination.
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