Modeling the Residence Time Distribution of a Non-Intermeshing Twin Screw Extruder
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M. Thompson
Abstract
The residence time distribution (RTD) of a counter-rotating non-intermeshing twin screw extruder has been studied by a radioactive tracer technique. RTDs were measured at both the die exit and at the first compounding zone of the extruder. The operating parameters investigated were: screw speed, screw flight stagger, and barrel temperature. These parameters have an effect on the mixing efficiency. The mixing efficiency was characterized by fitting measured response data with models comprised of different combinations of ideal reactor elements. The empirical flow models tested were: plug flow and tanks-in-series (with and without recirculation), plug flow and axial dispersion, and the Wolf-Resnick model. The fitted model parameters characterized the observed changes in the RTD due to the variation of the operating parameters.
© 1995, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Fourteenth in a Series: Pomini SpA: Dynamic International Machinery Manufacturer
- Internal Mixers
- Non-isothermal Dispersive Flow of a Rubber Mixture Inside an Internal Rotor Mixer
- Screw Extrusion/Continuous Mixing
- Solids Conveying and Melting in a Starve Fed Self-wiping Co-rotating Twin Screw Extruder
- Modeling the Residence Time Distribution of a Non-Intermeshing Twin Screw Extruder
- Mixing Ring
- Morphology in Blends of a Thermotropic Liquid Crystalline Polymer and Polypropylene
- Die Extrusion
- Mechanical Effects in Extrusion: Slit Dies
- Fibers and Films
- Relationship of Stresses in Blown-film Processes
- Molding
- Modelling and Experiments of Squeezing Flow of Polymer Melts
- Crystallization Behavior of Carbon Fiber Reinforced Polyamides (I) Dynamic and Isothermal Crystallization
- Structures and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylenes
- Forging
- Numerical Simulation of Polymer Forging
- Rapid Communication of Recent Advances
- Unstable Gas Penetrations in Symmetrical Rib Channels During Gas-assisted Injection Molding
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Fourteenth in a Series: Pomini SpA: Dynamic International Machinery Manufacturer
- Internal Mixers
- Non-isothermal Dispersive Flow of a Rubber Mixture Inside an Internal Rotor Mixer
- Screw Extrusion/Continuous Mixing
- Solids Conveying and Melting in a Starve Fed Self-wiping Co-rotating Twin Screw Extruder
- Modeling the Residence Time Distribution of a Non-Intermeshing Twin Screw Extruder
- Mixing Ring
- Morphology in Blends of a Thermotropic Liquid Crystalline Polymer and Polypropylene
- Die Extrusion
- Mechanical Effects in Extrusion: Slit Dies
- Fibers and Films
- Relationship of Stresses in Blown-film Processes
- Molding
- Modelling and Experiments of Squeezing Flow of Polymer Melts
- Crystallization Behavior of Carbon Fiber Reinforced Polyamides (I) Dynamic and Isothermal Crystallization
- Structures and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylenes
- Forging
- Numerical Simulation of Polymer Forging
- Rapid Communication of Recent Advances
- Unstable Gas Penetrations in Symmetrical Rib Channels During Gas-assisted Injection Molding
