Flow Visualization and Residence Time Distributions in a Modular Co-rotating Twin Screw Extruder
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P. J. Kim
Abstract
A flow visualization study is reported for the motions of a mineral oil and a thermoplastic polymer individually in a modular co-rotating twin screw extruder. Flow in particular elements and combinations of elements is described. Experiments were also carried out to determine the residence time distribution. The influence of modular screw configuration and screw speed on residence time distribution has been determined. It was found that replacing screw elements with kneading discs or left handed screw elements increases residence time and broadens the residence time distribution. Increasing screw speed at fixed feed rate reduces both the mean residence time and the variance σ2 of the residence time distribution. Increasing feed rate at fixed screw speed has a similar effect. The variation of σ2 with position along the screw axis was measured. The results are interpreted in terms of the fluid mechanics of twin screw extruders including the Akro-Co-Twin Screw program.
© 1994, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- Tenth in a Series: Cincinnati Milacron
- Screw Extrusion and Mixing
- Theoretical and Experimental Investigations into Screws for Extruding Polypropylene
- Flow Visualization and Residence Time Distributions in a Modular Co-rotating Twin Screw Extruder
- Influence of the Thermomechanical Parameters on the Morphology of a Polyamide (PA 6) and Polypropylene Blend
- Die Extrusion
- Cooling and Wall Thickness Uniformity in Plastic Pipe Manufacture
- Fiber and Film
- Melt Spinning Effects on Optical and Mechanical Properties of Poly(Aryl Sulfone)
- High-Speed, Non-Isothermal Fiber Spinning
- Effect of the Cast Film Production Process on the Properties of Oriented Polypropylene Film
- Molding
- Finite Element Simulation of Thick Tube Expansions
- Flexural Modulus of Compression Molded Glass Fiber Reinforced Thermoplastics
- Short Glass Fiber Reinforced PA 6 and ABS Blends
Articles in the same Issue
- Contents
- Contents
- Editorial
- Tenth in a Series: Cincinnati Milacron
- Screw Extrusion and Mixing
- Theoretical and Experimental Investigations into Screws for Extruding Polypropylene
- Flow Visualization and Residence Time Distributions in a Modular Co-rotating Twin Screw Extruder
- Influence of the Thermomechanical Parameters on the Morphology of a Polyamide (PA 6) and Polypropylene Blend
- Die Extrusion
- Cooling and Wall Thickness Uniformity in Plastic Pipe Manufacture
- Fiber and Film
- Melt Spinning Effects on Optical and Mechanical Properties of Poly(Aryl Sulfone)
- High-Speed, Non-Isothermal Fiber Spinning
- Effect of the Cast Film Production Process on the Properties of Oriented Polypropylene Film
- Molding
- Finite Element Simulation of Thick Tube Expansions
- Flexural Modulus of Compression Molded Glass Fiber Reinforced Thermoplastics
- Short Glass Fiber Reinforced PA 6 and ABS Blends
