Tubular Film Extrusion Stability of Metallocene Linear Low Density Polyethylene
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K. Kim
Abstract
The bubble stability of tubular film extrusion in metallocene linear low density polyethylene(m-LLDPE) and metallocene linear low density polyethylene/linear low density polyethylene(m-LLDPE/LLDPE) blend was investigated. Unstable bubble characteristics in m-LLDPE were found at low draw down ratio (DR) with a symmetric periodic bubble instability at low blow up ratio (BUR) and a helical instability at high blow up ratio. However, m-LLDPE showed better operation windows in tubular film extrusion than that of LLDPE, especially in bubble instability at low BUR. Both bubble instability and helical instability in LLDPE tubular film extrusion were enhanced by the blending with m-LLDPE. m-LLPE possesses higher melt elasticity as compared to m-LLDPE and LLDPE due to the long chain branching introduced by 1-octene co-monomer during polymerization. Blending resulted in broadening of molecular weight distribution (MWD) and thus increase in activation energy.
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© 2006, Hanser Publishers, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Dedication of the Special Issue of International Polymer Processing in Honor of Prof. James Lindsay White, Editor Emeritus and Founding Editor
- Invited Papers
- Melt Compounding of Polymeric Nanocomposites
- Experiments and Analysis of Effect of Calender Gaps on Melting of PVC Powders in an Intermeshing Counter-rotating Twin-screw Extruder
- Quantitative Analysis for Polymer Degradation in the Extrusion Process
- Visualization of Flow Instabilities for High Density Polyethylene
- Heat Transfer through Metal Walls of Finite Thickness
- Simulation and Experimental Verification of Crystallization and Birefringence in Melt Spinning of PET
- Structural Development and Properties of Melt Spun Poly(butylene succinate) and Poly(butylene terephthalate-co-succinate-co-adipate) Biodegradable Fibers
- External Calibration in PA12 Tube Extrusion
- Tubular Film Extrusion Stability of Metallocene Linear Low Density Polyethylene
- Multilayer Barrier Film of Biaxially Oriented PA6/EVOH by Double Bubble Tubular Film Process
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Dedication of the Special Issue of International Polymer Processing in Honor of Prof. James Lindsay White, Editor Emeritus and Founding Editor
- Invited Papers
- Melt Compounding of Polymeric Nanocomposites
- Experiments and Analysis of Effect of Calender Gaps on Melting of PVC Powders in an Intermeshing Counter-rotating Twin-screw Extruder
- Quantitative Analysis for Polymer Degradation in the Extrusion Process
- Visualization of Flow Instabilities for High Density Polyethylene
- Heat Transfer through Metal Walls of Finite Thickness
- Simulation and Experimental Verification of Crystallization and Birefringence in Melt Spinning of PET
- Structural Development and Properties of Melt Spun Poly(butylene succinate) and Poly(butylene terephthalate-co-succinate-co-adipate) Biodegradable Fibers
- External Calibration in PA12 Tube Extrusion
- Tubular Film Extrusion Stability of Metallocene Linear Low Density Polyethylene
- Multilayer Barrier Film of Biaxially Oriented PA6/EVOH by Double Bubble Tubular Film Process
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
