Blow Molding
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PE '2079851475616104457 Flash and Excessively Long Cycle
Fenómeno del problema
The parting line flash at the bottle mouth and bottom is thick and difficult to trim, while the '2079851475616104457 cycle is slow and the capacity cannot increase.
Análisis de la causa
Flash is mostly caused by excessive extrusion pressure/back pressure, improper pre-blow pressure or poor mold parting line fit; long cycles are caused by high material temperature, high mold temperature, large wall thickness and insufficient blowing pressure, forcing the cooling and shaping time to be lengthened.
Solución
①Reduce the extrusion pressure/back pressure and adjust the pre-blow pressure; ②repair the mold parting line fit; ③appropriately reduce the melt temperature and mold temperature; ④optimize the wall thickness; ⑤increase the blowing pressure or use a frozen air blowing system to accelerate shaping.
Conclusión clave
2079851475616104457 flash and cycle often have the 'same source'—high temperature and pressure: lower the temperature and adjust the pressure reasonably, reducing both flash and cycle; cooling and blowing efficiency are the two major constraints of the cycle.
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