In this work the control system for a continuous gravimetric blender for polymer extrusion process has been designed. The plant considered in this paper is a blending machine that mixes two different polymers, a bulk one and an additive. Each component of the mix is metered by a dedicated screw meter system. The mass delivered by each meter is measured by a load cell. The two components are poured into a hopper (the mixer) directly embedded on the extruder input. The control objectives are manifold and include: accurate mass flow estimate on the basis of the weight and screw speed measurements; accurate mass flow regulation of each meter; keeping of the relative proportions among all the components that are metered in all the operating conditions; guarantee that inside the mixer there is always material enough to fulfill the mass flow variation request of the extruder.

Control System Design for a Continuous Gravimetric Blender

PREVIDI, FABIO;BELLOLI, DAMIANO;SAVARESI, SERGIO MATTEO;
2011-01-01

Abstract

In this work the control system for a continuous gravimetric blender for polymer extrusion process has been designed. The plant considered in this paper is a blending machine that mixes two different polymers, a bulk one and an additive. Each component of the mix is metered by a dedicated screw meter system. The mass delivered by each meter is measured by a load cell. The two components are poured into a hopper (the mixer) directly embedded on the extruder input. The control objectives are manifold and include: accurate mass flow estimate on the basis of the weight and screw speed measurements; accurate mass flow regulation of each meter; keeping of the relative proportions among all the components that are metered in all the operating conditions; guarantee that inside the mixer there is always material enough to fulfill the mass flow variation request of the extruder.
2011
Proceedings of the 18th IFAC World Congress
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/609026
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