Injection Molding
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Large weight fluctuation of general-purpose polyethylene injection molded products
Fenómeno del problema
The weight of products continuously produced from the same mold is unstable, with fluctuations exceeding ±2%.
Weight fluctuation reflects process instability, directly affects dimensional accuracy and consistency of mechanical properties, and is especially critical in precision '2079851475616104452.
Análisis de la causa
（1）The screw non-return ring is worn or damaged, and the injection amount is inconsistent each time
（2）The plasticizing back pressure is unstable, and the melt density fluctuates
（3）The barrel temperature fluctuates greatly, and the melt density changes with temperature
（4）The injection speed is unstable, and the hydraulic system pressure fluctuates
（5）The raw material supply is discontinuous, the feeding port bridges or the material level is unstable
Solución
（1）Check the screw non-return ring, and replace it if the wear exceeds 0.1mm, to ensure consistent injection amount each time
（2）Stabilize the back pressure at 5-8MPa, and the back pressure fluctuation should not exceed ±0.5MPa
（3）Stabilize the barrel temperature, and control the fluctuation of each section within ±3°C (within the range of 160-260°C)
（4）Check the pressure stability of the hydraulic system, and repair the hydraulic pump and valves if necessary
（5）Ensure smooth feeding, install a magnetic frame on the hopper to prevent metal impurities, and avoid bridging
Conclusión clave
Weight fluctuation is caused by unstable plasticization and metering, and needs to be solved from the screw non-return ring, temperature control, and hydraulic system stability.
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