Utilization of pressure transducers for improved control of the extrusion process
Utilization of pressure transducers for improved control of the extrusion process . No direct relation between output and melt pressure exists due to melt viscosity fluctuations, but in practice die pressure fluctuations do correlate with output changes. Due to the precise quality and tolerance requirements of extruded products, it is very important to keep both the output rate and the melt condition constant.
1. Melt pressure, which is one of the variables in this process, can be both measured and controlled with the use of improving control of the melt pump extrusion process, can be both measured and controlled with the use of a pressure transducer and some type of instrumentation. The transducer is a highly sophisticated sensor which is capable of measuring very small changes in head pressure can result in extrudate variation. Studies have shown that a head pressure change of 1% can result in a change f up to 3% in the extruder output.
2. Changes in head pressure can indicate the condition of the screen pack, die or heater troubles, screw/barrel wear or damage, material feed problems and start-up or shutdown related problems.
3. In general, improved production, product quality, personnel and equipment safety and diagnostic information can all be achieved with proper pressure measurement.