Existing Scale-up Rules for Single-screw Plasticating Extruders
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H. Potente
Abstract
This paper gives a review of existing scale-up rules for single screw plasticating extruders. It is shown that there were and still are rather varied trends. The main three are:
scale-up rules under the boundary conditions of an invariant shear rate,
scale-up rules including the power law,
scale-up rules including the zones of operation.
In Europe, at least, the scale-up rules, which take the power law-flow characteristics into account, seem to have been established in practical terms. For economical reasons conventional extruders are designed in such a way, that the output increases with the square of the diameter. This however, results in the problem that the melting rate does not follow the same scale-up rules as the pumping rate and the solid conveying rate. Thus the discussion continues, to calculate the operating section lengths according to varying scale-up rules. Finally the scale-up problem is discussed once more with respect to the dominant dimensionless numbers, and despite several similarity theoretical difficulties a standardized solution will be attempted to be found.
© 1991, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Review Paper
- Existing Scale-up Rules for Single-screw Plasticating Extruders
- Internal Mixers
- Scale-up Effect in Internal Mixers
- Mixing and Extrusion of High Silica and all Silica-natural Rubber Compounds
- Screw Extrusion
- An Analytical Model of Partial and Thorough Melting in Single-screw Extruders
- Dimensionless Non-Newtonian Isothermal Simulation and Scale-up Considerations for Modular Intermeshing Corotating Twin Screw Extruders
- Erratum
- Die Extrusion
- Extrusion of Rubber Compounds and Highly Filled Thermoplastics through Coathanger Dies
- Pressure Oscillations during Capillary Extrusion of High Density Polyethylene
- Frequency Analysis of Pressure Fluctuations in a Single Screw Extruder
- Fibers and Films
- Orientation and Mechanical Property Development in the Melt Spinning of Fibers from Polyetherimide and Polyarylate
- Study on the Formation of β-Crystalline from Isotactic Polypropylene Fiber
- Biaxially-oriented Polyethylene Films by Compression of Injected Moldings
- Modelling of the Cooling of Semi-crystalline Polymers during their Processing
- Molding
- Non-isothermal Mold Filling and Curing Simulation in Thin Cavities with Preplaced Fiber Mats
- Predicting the Skin-Core Boundary Location in Injection Moldings
Articles in the same Issue
- Contents
- Contents
- Review Paper
- Existing Scale-up Rules for Single-screw Plasticating Extruders
- Internal Mixers
- Scale-up Effect in Internal Mixers
- Mixing and Extrusion of High Silica and all Silica-natural Rubber Compounds
- Screw Extrusion
- An Analytical Model of Partial and Thorough Melting in Single-screw Extruders
- Dimensionless Non-Newtonian Isothermal Simulation and Scale-up Considerations for Modular Intermeshing Corotating Twin Screw Extruders
- Erratum
- Die Extrusion
- Extrusion of Rubber Compounds and Highly Filled Thermoplastics through Coathanger Dies
- Pressure Oscillations during Capillary Extrusion of High Density Polyethylene
- Frequency Analysis of Pressure Fluctuations in a Single Screw Extruder
- Fibers and Films
- Orientation and Mechanical Property Development in the Melt Spinning of Fibers from Polyetherimide and Polyarylate
- Study on the Formation of β-Crystalline from Isotactic Polypropylene Fiber
- Biaxially-oriented Polyethylene Films by Compression of Injected Moldings
- Modelling of the Cooling of Semi-crystalline Polymers during their Processing
- Molding
- Non-isothermal Mold Filling and Curing Simulation in Thin Cavities with Preplaced Fiber Mats
- Predicting the Skin-Core Boundary Location in Injection Moldings
