Experimental and Theoretical Study of Polymer Melting in a Co-rotating Twin Screw Extruder
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B. Vergnes
Abstract
The flow of molten polymers in corotating twin screw extruders has been largely studied, but little attention has been paid until now to the melting process. In the present work, we develop an experimental study of melting in twin screw extruders, including pressure and temperature measurements, dead-stop experiments and sampling, observation of cross sections and quantification of solid fraction. The influences of process parameters (screw speed and feed rate), screw profile, pellets size and extruder size are also investigated. An original model of the melting process is proposed, deduced from these observations. This model allows one to calculate the evolution of mean shear rate, pressure gradient, dissipated energy, pellet radius and both solid and liquid temperatures along the screws, for a sequence of right- and left-handed screw elements and blocks of kneading discs. The results of the model are in good agreement with the experiments.
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© 2001 Walter de Gruyter GmbH, Berlin/Boston, Germany
Articles in the same Issue
- Contents
- Editorial
- Pioneer of Regenerated Cellulose and Reactive Processing Charles Frederick Cross
- Mixing and Screw Extrusion
- Characterization of Distributive Mixing in Polymer Processing Equipment using Renyi Entropies
- Investigation of Flow Rate and Viscous Dissipation in a Single Screw Pump-Extruder
- Direct Method for Deconvoluting Two Residence Time Distribution Curves
- Process Behavior of Special Mixing Elements in Twin-screw Extruders
- Experimental and Theoretical Study of Polymer Melting in a Co-rotating Twin Screw Extruder
- Experimental and Theoretical Study on the Performance of an Extruder for Cross-linkable PE
- Laminar Fluid Chaotic Mixing in Three-Dimensional Continuous Flow Domains
- Film
- Morphological Characterization of PE Blown Films by Atomic Force Microscopy
- Orientation and Mechanical Properties of Extrusion Cast PA 12 Films in Biaxial Stretching Process
- Injection Molding
- Simulation Opportunities by a Three-dimensional Calculation of Injection Moulding based on the Finite Element Method
- Flow Marks in Injection Molding of PP
- Injection Molding of Plastic Plates Combined with Boss Features on Superplastic Zn–22Al Sheet
- PPS News
- PPS News/Calendar of Future PPS Meetings
- Join in PPS-18
- Join in PPS-18
- Professional News
- Professional News
Articles in the same Issue
- Contents
- Editorial
- Pioneer of Regenerated Cellulose and Reactive Processing Charles Frederick Cross
- Mixing and Screw Extrusion
- Characterization of Distributive Mixing in Polymer Processing Equipment using Renyi Entropies
- Investigation of Flow Rate and Viscous Dissipation in a Single Screw Pump-Extruder
- Direct Method for Deconvoluting Two Residence Time Distribution Curves
- Process Behavior of Special Mixing Elements in Twin-screw Extruders
- Experimental and Theoretical Study of Polymer Melting in a Co-rotating Twin Screw Extruder
- Experimental and Theoretical Study on the Performance of an Extruder for Cross-linkable PE
- Laminar Fluid Chaotic Mixing in Three-Dimensional Continuous Flow Domains
- Film
- Morphological Characterization of PE Blown Films by Atomic Force Microscopy
- Orientation and Mechanical Properties of Extrusion Cast PA 12 Films in Biaxial Stretching Process
- Injection Molding
- Simulation Opportunities by a Three-dimensional Calculation of Injection Moulding based on the Finite Element Method
- Flow Marks in Injection Molding of PP
- Injection Molding of Plastic Plates Combined with Boss Features on Superplastic Zn–22Al Sheet
- PPS News
- PPS News/Calendar of Future PPS Meetings
- Join in PPS-18
- Join in PPS-18
- Professional News
- Professional News
