Extrusion of Short Fibre Reinforced PP
-
D. Dospis~il
Abstract
Data regarding the influence of screw geometry on homogeneity and fibre length reduction during single screw extrusion of short glass fibre reinforced PP are presented. Three screw geometries, two grades of PP with different melt flow indices, and four levels of filling (10 to 40 wt.%) were the main variables studied. The fibre breakage mechanism was evaluated with respect to solid and melt conveying and melting mechanisms in the screw channels. The screw with a long compression zone produced a material of poor homogeneity, a stable melting mechanism and a medium level of fibre length reduction. The very short compression zone screw produced unstable melting which considerably improved the homogenization process of the fibres in the polymer matrix. In this way the extrudates remained smooth up to the 30 wt.% filling level. The homogeneity was comparable to that obtained by a process including two steps of compounding: twin screw and single screw extrusion. However, the fibre degradation in the screw with a very short compression zone was substantially lower than in the process including two compounding steps.
© 1994, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- Eleventh in a Series: Fried Krupp: Pioneer Integrated Steel and Processing Machinery Manufacturer. Part 2 – Post World War II Development, Kautex, Corpoplast and Werner and Pfleiderer
- Internal Mixers
- Analysis of Mixing Performance in a VIC Mixer
- Screw Extrusion
- Extrusion of Short Fibre Reinforced PP
- Simulation of Non-isothermal Flow in Twin Screw Extrusion
- Reactive Processing
- Compatibilization and Dynamic Vulcanization of PA 6/Isobutylene Methylstyrene Elastomer
- Thermal Effects in Extrusion: Slit Dies
- Die Extrusion
- Functionalization of Polypropylene with Maleic Anhydride by Reactive Extrusion
- Fiber and Film Processing
- Stationary and Dynamic Analysis of Film Casting Process
- An Experimental Study of a Bicomponent Coextrusion Fiber Spinning
- Molding
- Integral Constitutive Model (K-BKZ) to Describe Viscoelastic Flow in Injection Molding
Articles in the same Issue
- Contents
- Contents
- Editorial
- Eleventh in a Series: Fried Krupp: Pioneer Integrated Steel and Processing Machinery Manufacturer. Part 2 – Post World War II Development, Kautex, Corpoplast and Werner and Pfleiderer
- Internal Mixers
- Analysis of Mixing Performance in a VIC Mixer
- Screw Extrusion
- Extrusion of Short Fibre Reinforced PP
- Simulation of Non-isothermal Flow in Twin Screw Extrusion
- Reactive Processing
- Compatibilization and Dynamic Vulcanization of PA 6/Isobutylene Methylstyrene Elastomer
- Thermal Effects in Extrusion: Slit Dies
- Die Extrusion
- Functionalization of Polypropylene with Maleic Anhydride by Reactive Extrusion
- Fiber and Film Processing
- Stationary and Dynamic Analysis of Film Casting Process
- An Experimental Study of a Bicomponent Coextrusion Fiber Spinning
- Molding
- Integral Constitutive Model (K-BKZ) to Describe Viscoelastic Flow in Injection Molding
