Molding Process
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ABS hopper bridging, unstable feeding
Fenómeno do problema
The hopper feeding is intermittent, the plasticizing amount fluctuates, the product is good at times and bad at times, clearly related to the feeding rhythm.
Análise das causas
The hopper temperature is too high or the granule shape is uneven (including crushed material), causing the granules to bridge at the hopper mouth; bridging is more likely when the regrind flake ratio is high; unstable feeding directly causes plasticizing and metering fluctuations.
Solução
①Pass cooling water through the hopper neck to control the temperature; ②control the crushed material ratio and particle size; ③install stirring or vibrating feeding; ④keep the drying air circulation normal; ⑤monitor the plasticizing time as an early warning.
Conclusão principal
ABS 'if the feeding is unstable, no matter how accurate the process is, it is in vain': bridging and crushed material are common culprits; include the plasticizing time in monitoring, it often alarms before the product has problems.
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