A Physico-Mathematical Model for Solids Conveying in Co-Rotating Twin Screw Extruders
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H. Potente
Abstract
Contrary to the case for the melt conveying zone, no adequate description exists as yet for the solids conveying zone of a co-rotating twin-screw extruder. A physico-mathematical model of the solids conveying zone, however, is a prerequisite for determining the location of the plasticizing zone and for establishing the optimum screw configuration that goes with a selected point of operation. This paper presents a physico-mathematical model to describe the processes taking place in the solids conveying zone. The conveying zone is divided into a partially-filled feed zone and a completely filled compression zone. Force and torque balances are drawn up for three different volume elements and, with the solutions obtained for these, it is possible to calculate the maximum conveyable throughput, the pressure profile over the length of the solid material accumulations and the drive power that is required or the solids conveying zone.
© 1996, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Seventeenth in a Series: Reifenhäuser – From Blacksmiths to Master Integrated Screw Extrusion System Manufacturers
- Invited Paper
- 35 Years of Studies of Mixing of Rubber and Viscoelasticity
- Mixing
- Melt Strength and Elastic Behaviour of LLDPE/LDPE Blends
- Screw Extrusion
- Melting and Blending in a Modular Co-Rotating/Counter-Rotating Twin Screw Extruder
- A Physico-Mathematical Model for Solids Conveying in Co-Rotating Twin Screw Extruders
- Fibers and Films
- High-speed Melt Spinning of PET
- Die Extrusion
- Evaluation of the FAN Technique for Profile Die Design
- Molding
- Analysis of the Mold Filling Process with Phase Change Considering the Non-steady Effect
- Analysis of the Local Volume Flow Rate of Polymers During Injection Molding
- Surface Defect Formation in the Injection Molding of Acrylonitrile-Styrene-Acrylate Polymers
- Injection Molding of Microcomposites Based on Polypropylene and Thermotropic Liquid Crystalline Polymers
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Seventeenth in a Series: Reifenhäuser – From Blacksmiths to Master Integrated Screw Extrusion System Manufacturers
- Invited Paper
- 35 Years of Studies of Mixing of Rubber and Viscoelasticity
- Mixing
- Melt Strength and Elastic Behaviour of LLDPE/LDPE Blends
- Screw Extrusion
- Melting and Blending in a Modular Co-Rotating/Counter-Rotating Twin Screw Extruder
- A Physico-Mathematical Model for Solids Conveying in Co-Rotating Twin Screw Extruders
- Fibers and Films
- High-speed Melt Spinning of PET
- Die Extrusion
- Evaluation of the FAN Technique for Profile Die Design
- Molding
- Analysis of the Mold Filling Process with Phase Change Considering the Non-steady Effect
- Analysis of the Local Volume Flow Rate of Polymers During Injection Molding
- Surface Defect Formation in the Injection Molding of Acrylonitrile-Styrene-Acrylate Polymers
- Injection Molding of Microcomposites Based on Polypropylene and Thermotropic Liquid Crystalline Polymers
