Melting of Polymer Blends in Co-rotating Twin Screw Extruders
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H. Potente
Abstract
Experimental studies of the melting process in extruders generally involve a high outlay and can only be performed with certain restrictions, both in respect of the method employed and with regard to the evaluation of the results. This part of the work describes one possible way of studying the melting of binary incompatible polymer combinations. The method described makes it possible to estimate the degree of melting of the two components over the length of the screws of the twin screw extruder. Experimental studies were performed of polypropylene/polyamide 6 (PP/PA6) blends containing low weight contents of the disperse PA 6 phase.
In order to verify the theoretical models set out in Part I, page 124 of this issue, not only were the process conditions of screw speed and throughput varied but also the viscosity ratio. This was achieved by using two different PP grades. In addition, comparable tests were performed on two different sizes of extruders.
The tests show that the melting of polymer blends, and particularly the melting of the second component, which melts at a higher temperature, is determined to a significant extent by the screw rotational speed, the throughput, the ratio of the extruder channel depth to granule diameter and also the material combination (viscosity ratio).
Comparisons of calculations and experiments show that the melting profiles calculated for different material combinations and process conditions tally well with the experimental studies in overall terms.
© 2001, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Editorial
- Ninth of a Series Pioneer of the Modular Co-rotating Twin Screw Extruder–Rudolf Erdmenger (1911–1991)
- Internal Mixer
- The “New-Generation” Co-flow Intermeshing Internal Mixer
- Screw Extrusion/Continuous Mixers
- Twin Screw Compounding of PE-HD Wood Flour Composites
- A Transient Melting Model of Polymer Balls Sliding Against the Barrel
- Prediction of Screw Length Required for Polymer Melting and Melting Characteristics
- Melting of Polymer Blends in Co-rotating Twin Screw Extruders
- Melting of Polymer Blends in Co-rotating Twin Screw Extruders
- Melting of Polymer Blends in Co-rotating Twin Screw Extruders
- The Mapping Method for Mixing Optimization Part I: The Multiflux Static Mixer
- The Mapping Method for Mixing Optimization
- Reactive Processing
- Comparison Studies of Anionic Polymerization of Caprolactam in Different Twin Screw Extruders
- Compatibilization of SBR/NBR Blends Using Chemically Modified Styrene Butadiene Rubber
- Coextrusion
- Convective Instabilities in the Coextrusion Process
- Numerical Simulation of Polymer Coextrusion Flows
- Thermoforming
- Tight Tolerance Thermoforming
Artikel in diesem Heft
- Editorial
- Ninth of a Series Pioneer of the Modular Co-rotating Twin Screw Extruder–Rudolf Erdmenger (1911–1991)
- Internal Mixer
- The “New-Generation” Co-flow Intermeshing Internal Mixer
- Screw Extrusion/Continuous Mixers
- Twin Screw Compounding of PE-HD Wood Flour Composites
- A Transient Melting Model of Polymer Balls Sliding Against the Barrel
- Prediction of Screw Length Required for Polymer Melting and Melting Characteristics
- Melting of Polymer Blends in Co-rotating Twin Screw Extruders
- Melting of Polymer Blends in Co-rotating Twin Screw Extruders
- Melting of Polymer Blends in Co-rotating Twin Screw Extruders
- The Mapping Method for Mixing Optimization Part I: The Multiflux Static Mixer
- The Mapping Method for Mixing Optimization
- Reactive Processing
- Comparison Studies of Anionic Polymerization of Caprolactam in Different Twin Screw Extruders
- Compatibilization of SBR/NBR Blends Using Chemically Modified Styrene Butadiene Rubber
- Coextrusion
- Convective Instabilities in the Coextrusion Process
- Numerical Simulation of Polymer Coextrusion Flows
- Thermoforming
- Tight Tolerance Thermoforming
