Measuring Polymer Melt Density and Viscosity in Real-time during Extrusion Processes using Ultrasound Sensors Fusion
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N. H. Abu-Zahra
Abstract
A dual-sensor system is developed to measure the density and viscosity of polymer melts, simultaneously, during extrusion process. The sensory system utilizes a 2.25 MHz longitudinal ultrasound transducer in conjunction with a 2.25 MHz shear type ultrasound transducer, placed in a modified extrusion die. The acoustic impedance of the polymer melt, corresponding to the longitudinal ultrasound waves (UTL), is used to measure the density of the polymer melt using established physical models. While, the acoustic impedance of the shear waves (UTS) is used to measure the viscosity of the polymer melt, utilizing the density measurements obtained by the longitudinal ultrasound transducer.
The system was evaluated using polyvinyl chloride compounds containing various levels of foaming agent and processing aid at fixed processing conditions. The system measurements of the melt density was compared to the density of the extrudate, while the viscosity measurements were compared to the calculated values using slit-rheometry equations. The correlation coefficients between the ultrasound sensor and actual measurements were in the range of 92% and 96% for the melt density and viscosity; respectively.
© 2003, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Fourth of a Series: Pioneering Polymer Industry Developments: The First Continuous Kneading Machines
- Screw Extrusion
- Prediction of Residence Time Distribution in EZ and KE Element of a Ko-Kneader by using CFD Method
- Computational Study of Velocity Field in the KE Element of a Modular Ko-Kneader with CFD Method
- Optimization of Sweet Bread Dough Processing Conditions by Twin Screw Extrusion
- Experimental Development of Processing Technology for Yuba-like Films Using Twin Screw Extrusion
- Die Extrusion
- Flow Analyses in a Spiral Mandrel Die Assuming Wall Slip
- Effect of Elongational Viscosity on the Flow in a Flat Die
- Measuring Polymer Melt Density and Viscosity in Real-time during Extrusion Processes using Ultrasound Sensors Fusion
- Film
- Scale-up Rule for Double Bubble Tubular Process of PA6 Film
- Molding
- Analysis of the Morphological Development of PBT/ABS Blends during the Twin Screw Extrusion and Injection Molding Processes
- Investigation of the Mechanical Properties and Chemical Resistance of PC/PBT/Impact Modifier Blends
- Structure Development in Injection Molding of Isotactic Polypropylene, its Blends, Compounds and Dynamic Vulcanizates
- The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
- The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
- PPS News
- PPS News
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Fourth of a Series: Pioneering Polymer Industry Developments: The First Continuous Kneading Machines
- Screw Extrusion
- Prediction of Residence Time Distribution in EZ and KE Element of a Ko-Kneader by using CFD Method
- Computational Study of Velocity Field in the KE Element of a Modular Ko-Kneader with CFD Method
- Optimization of Sweet Bread Dough Processing Conditions by Twin Screw Extrusion
- Experimental Development of Processing Technology for Yuba-like Films Using Twin Screw Extrusion
- Die Extrusion
- Flow Analyses in a Spiral Mandrel Die Assuming Wall Slip
- Effect of Elongational Viscosity on the Flow in a Flat Die
- Measuring Polymer Melt Density and Viscosity in Real-time during Extrusion Processes using Ultrasound Sensors Fusion
- Film
- Scale-up Rule for Double Bubble Tubular Process of PA6 Film
- Molding
- Analysis of the Morphological Development of PBT/ABS Blends during the Twin Screw Extrusion and Injection Molding Processes
- Investigation of the Mechanical Properties and Chemical Resistance of PC/PBT/Impact Modifier Blends
- Structure Development in Injection Molding of Isotactic Polypropylene, its Blends, Compounds and Dynamic Vulcanizates
- The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
- The Flow Behavior of Core Material and Breakthrough Phenomenon in Sandwich Injection Molding
- PPS News
- PPS News
