Residence Time Distribution in a High Shear Twin Screw Extruder
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E. Fel
Abstract
The residence time distributions (RTD) of a high shear twin screw extruder were measured by an on–line UV fluorescence device. First, by increasing throughput (Q) and screw speed (N), a decrease of the complex viscosity of the studied polypropylene (PP) was observed, revealing chain scissions. It was associated to high viscous dissipation taking place during extrusion, and more particularly under high shear conditions. Then the impact of these experimental conditions on the RTD was carried out. As expected, an increase of usual throughputs and screw speeds decrease mostly the RTD characteristic data. In this study industrial rate have been studied: throughput varied from 1.5 up to 22 kg h−1 and screw speed varied from 200 min−1 up to 1 200 min−1. However, by increasing the screw speed over usual values (from 500 up to 1 200 min−1), the variation of some experimental RTD characteristics were unexpected. Indeed, the slope of the shape of the experimental RTD function E(t) changed significantly. This phenomenon will be called lag or delay time. This result was only observed at low throughputs and high screw rotation speeds. To finish, a modeling software of twin screw extrusion process was used to compare experimental and calculated results. For usual processing conditions (up to 700 min−1), the simulation predicts nicely the experimental RTDs. However, at high screw speed (N > 800 min−1) and moderate throughput (Q = 4 kg h−1), the simulation fails to predict the RDT delay time. Hence, some side effects apparently occurred during high shear extrusion at low throughputs.
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© 2014, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Invited Articles
- The Effect of Molecular Parameters on the Thermal Behavior of Recycled and Virgin Polyamides and Their Glass Fiber Composites
- Carbon Nanotube Conductive Networks through the Double Percolation Concept in Polymer Systems
- Application of the Experimental Results to the Modified Halpin-Tsai Micromechanical Model to Evaluate the Clay Dispersion in Clay-Reinforced Polyethylene Nanocomposites
- Influence of Solvent Washing and Soxhlet Extraction on the Thermal Stability of Organically Modified Layered Silicates
- Effect of Screw Rotation Speed on the Properties of Polycarbonate/Vapor-Grown Carbon Fiber Composites Prepared by Melt Compounding
- Simulation of Co-Rotating Twin Screw Extrusion Process Subject to Pressure-Dependent Wall Slip at Barrel and Screw Surfaces: 3D FEM Analysis for Combinations of Forward- and Reverse-Conveying Screw Elements
- Preparation of Polymer-Clay Nanocomposites by Melt Mixing in a Twin Screw Extruder: Using On-Line SAOS Rheometry to Assess the Level of Dispersion
- Residence Time Distribution in a High Shear Twin Screw Extruder
- PVDF/Carbonnanotubes/Nanoclay Composites for Piezoelectric Applications
- Viscoelastic and Electrical Properties of Carbon Nanotubes Filled Poly(butylene succinate)
- Sealability and Seal Characteristics of PE/EVA and PLA/PCL Blends
- Effects of Polymer Viscosity and Nanofillers on Morphology of Nanofibers Obtained by a Gas Jet Method
- Modeling of the Torque Requirements for the Mixing and Dispersion of Silica into Rubber
- High Shear Processing of (PP/EPR)/Silica Nanocomposites: Improvement of Morphology and Properties
- An Overview of Molten Polymer Drawing Instabilities
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Invited Articles
- The Effect of Molecular Parameters on the Thermal Behavior of Recycled and Virgin Polyamides and Their Glass Fiber Composites
- Carbon Nanotube Conductive Networks through the Double Percolation Concept in Polymer Systems
- Application of the Experimental Results to the Modified Halpin-Tsai Micromechanical Model to Evaluate the Clay Dispersion in Clay-Reinforced Polyethylene Nanocomposites
- Influence of Solvent Washing and Soxhlet Extraction on the Thermal Stability of Organically Modified Layered Silicates
- Effect of Screw Rotation Speed on the Properties of Polycarbonate/Vapor-Grown Carbon Fiber Composites Prepared by Melt Compounding
- Simulation of Co-Rotating Twin Screw Extrusion Process Subject to Pressure-Dependent Wall Slip at Barrel and Screw Surfaces: 3D FEM Analysis for Combinations of Forward- and Reverse-Conveying Screw Elements
- Preparation of Polymer-Clay Nanocomposites by Melt Mixing in a Twin Screw Extruder: Using On-Line SAOS Rheometry to Assess the Level of Dispersion
- Residence Time Distribution in a High Shear Twin Screw Extruder
- PVDF/Carbonnanotubes/Nanoclay Composites for Piezoelectric Applications
- Viscoelastic and Electrical Properties of Carbon Nanotubes Filled Poly(butylene succinate)
- Sealability and Seal Characteristics of PE/EVA and PLA/PCL Blends
- Effects of Polymer Viscosity and Nanofillers on Morphology of Nanofibers Obtained by a Gas Jet Method
- Modeling of the Torque Requirements for the Mixing and Dispersion of Silica into Rubber
- High Shear Processing of (PP/EPR)/Silica Nanocomposites: Improvement of Morphology and Properties
- An Overview of Molten Polymer Drawing Instabilities
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
