Melting and Blending in a Modular Co-Rotating/Counter-Rotating Twin Screw Extruder
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J. W. Cho
Abstract
A comparative experimental study of blending polyethylene and polystyrene in a modular self wiping co-rotating and intermeshing counter-rotating twin screw extruder is described with similar modular screw configurations. Comparisons are made using different screw configurations possessing different numbers and placement of kneading disc blocks. Generally the intermeshing counter-rotating mode melts and mixes more rapidly than the co-rotating mode. The phase morphology in each machine seems to similarly from mixtures of pellets to polyethylene lamellae surrounding polystyrene pellets to a co-continuous morphology. Kneading disc blocks greatly enhance the rate of melting and mixing and are most effective when placed near the feed port rather than near the die. At 160°C, where the polystyrene has a much higher viscosity a co-continuous morphology develops. At 260°C where the polystyrene has a lower viscosity first a co-continuous and then a disperse phase morphology evolves.
© 1996, Carl Hanser Verlag, Munich
Articles in the same Issue
- 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
Articles in the same Issue
- 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
