Rheological and Theoretical Estimation of the Spinnability of Polyolefines
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R. Vogel
Abstract
Melt spinning is a polymer processing technique that makes great demands on the extensibility of the polymer melt in the distance between die exit and solidification point [1]. The polymer material is exposed to a rapidly growing deformation rate over a large range of deformation within a short time of about 100 milliseconds. Simultaneously an extreme cooling occurs with cooling rates of about 1000 K/s. For this reason only a few polymer materials are usable for this kind of polymer processing with sufficient take-up speeds. Most polymers show a fiber break in the molten state either by brittle cohesive rupture or ductile failure when approaching critical conditions of deformation. The rheological behaviour of a polymer melt at the critical conditions of deformation in the fiber forming process can not be predicted by means of usual rheological material functions. This paper reports the attempt to find out material functions, which describe the critical deformation states of the melt spinning process. The established material functions are compared with the results of spinning experiments to estimate their practicality.
© 1999, Carl Hanser Verlag, Munich
Articles in the same Issue
- Regular Contributed Articles
- Polymer Processing Problems from Non-Rheological Causes1
- Utilization of Rheology Control to Develop Wood-Grain Patterned PVC/Wood Flour Composites
- Screw Drive Power of Single Screw Plasticating Units With Smooth Barrels
- Design of Dispersive Mixing Devices
- Dynamic Performance of Single-Screws of Different Configurations
- A Comparative Study of Residence Time Distributions in a Kneader, Continuous Mixer, and Modular Intermeshing Co-Rotating and Counter-Rotating Twin Screw Extruders
- Influence of a ‘Rotating Tip’ on the Properties of Tubing Made Using a Cross-Head Tubing Die
- Modelling of Capillary Rheometer Data and Extrapolation of the Viscosity Function into the Linear Viscoelastic Region
- Relationship Between Structure and Spinning Processing of As-Spun PP Fibres
- Rheological and Theoretical Estimation of the Spinnability of Polyolefines
- Drawing of β-Crystal Nucleator-Added PP
- Wave Behavior in the Coating Process of Multilayer Polymeric Materials
- Process Optimization of Thermoforming PP/CaCO3 Composites
- A Stiffness Criterion For Cooling Time Estimation
Articles in the same Issue
- Regular Contributed Articles
- Polymer Processing Problems from Non-Rheological Causes1
- Utilization of Rheology Control to Develop Wood-Grain Patterned PVC/Wood Flour Composites
- Screw Drive Power of Single Screw Plasticating Units With Smooth Barrels
- Design of Dispersive Mixing Devices
- Dynamic Performance of Single-Screws of Different Configurations
- A Comparative Study of Residence Time Distributions in a Kneader, Continuous Mixer, and Modular Intermeshing Co-Rotating and Counter-Rotating Twin Screw Extruders
- Influence of a ‘Rotating Tip’ on the Properties of Tubing Made Using a Cross-Head Tubing Die
- Modelling of Capillary Rheometer Data and Extrapolation of the Viscosity Function into the Linear Viscoelastic Region
- Relationship Between Structure and Spinning Processing of As-Spun PP Fibres
- Rheological and Theoretical Estimation of the Spinnability of Polyolefines
- Drawing of β-Crystal Nucleator-Added PP
- Wave Behavior in the Coating Process of Multilayer Polymeric Materials
- Process Optimization of Thermoforming PP/CaCO3 Composites
- A Stiffness Criterion For Cooling Time Estimation
