Applications
Requirements:
Automation for automatic screen change
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Thermoregulation
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Monitoring of molten polymer pressure
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Hydraulic circuit pressure monitoring
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Requirement:
Automation for automatic screen change
Automatic Screen Changer systems require a constant balance between interdependent variables, such as upstream and downstream molten polymer pressure and synchronisation with the main extruder. The control system must respond quickly to temperature or pressure changes, provide integrated diagnostics and support material changes, ensuring stable and continuous process management.
Solution:
- Preconfigured and customisable application templates
- Docker technology for installing applications such as IoT dashboards, predictive maintenance or integration with MES and ERP systems
- Open architecture designed for edge computing
Requirement:
Thermoregulation
Stable rheological behaviour and the resulting dimensional consistency of the extrudate are achieved through proper temperature control. It is therefore essential that the systems downstream of the primary process do not impact the properties obtained in extrusion. The Screen changer must therefore ensure thermal stability, avoiding potential defects (surface instability, thickness variations or alterations in the optical quality of the product).
- Each resistor is managed in a closed loop via PID control, integrated into the PLC or entrusted to dedicated controllers such as the 1850, which allows the melt temperature to be maintained within ±0.5 °C of the setpoint, ensuring constant viscosity and no surface or dimensional defects
- The compact GRP-H solid state relay with integrated heat sink ensures precise current control up to 120 A. IO-Link communication also reduces the number of I/O cards required, thanks to the integrated management of commands, alarms and current consumption
Requirement:
Monitoring of molten polymer pressure
Pressure is the key parameter for assessing filter efficiency. An increase in the pressure differential between upstream and downstream indicates the accumulation of impurities and the progressive obstruction of the filter mesh. Continuous monitoring allows intervention thresholds to be set that activate alarms or automatic replacement procedures, keeping the melt quality stable.
Solution:
- Membrane up to 15 times thicker than traditional sensors, without internal transmission fluid, which transfers pressure directly to the sensitive silicon chip
- High resistance to wear and dynamic shocks, thermal stability less than 1% FS from 20°C to 350°C
- IEPLc version with electrical output and PLc certification, for integration into safety control systems and certified alarm configuration
Requirement:
Hydraulic circuit pressure monitoring
Automatic melt filtration systems may include a hydraulic circuit for moving filter discs or cleaning pistons. Pressure monitoring not only detects anomalies, but also provides direct control of the consistency between command and response. This feedback is crucial for operator safety and machine protection, as well as for process reliability.
Solution:
- Measuring range from 1 bar to 1000 bar
- Outputs: analogue 4…20 mA, 0…10 V
- IO-Link communication
- SIL2 certification
