Characterization of the Sharkskin Defect and its Development with the Flow Conditions**
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P. Beaufils
Abstract
We have studied the development of the sharkskin defect of a linear low density polyethylene, by using complementary experimental techniques. Roughness measurements have allowed to accurately characterize the surface of the extrudates. Flow birefringence observations have permitted to visualize the flow conditions inside the die. The development of the defect is strongly dependent on the temperature and quasi-independent on the geometry (die length, entry angle). Theoretical computations of the flow through the slit die have allowed the correlation of the amplitude of the defect with the stress distribution. Sharkskin defect appears as a continuous and regular phenomenon of surface degradation without intervention of wall slip.
© 1989, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Review Paper
- New Developments in Fiber- and Filmextrusion
- Original Contributions
- Use of Chilled Die Lips to Improve Production Rates in Extrusion of PE
- Characterization of the Sharkskin Defect and its Development with the Flow Conditions**
- Modifying Threadline Dynamics in the High-speed Melt Spinning Process
- Computer Simulation of Multi filament Air Jet Melt Spinning
- Structure Development in the Melt Spinning and Drawing of Poly p Phenylene Sulfide Fibers
- Cast Film Extrusion of Polypropylene Films
- Air Ring Effect on Blown Film Dynamics
- Computer Simulation of Melt Viscoelasticity Functions for Binary Polyblends
Artikel in diesem Heft
- Contents
- Contents
- Review Paper
- New Developments in Fiber- and Filmextrusion
- Original Contributions
- Use of Chilled Die Lips to Improve Production Rates in Extrusion of PE
- Characterization of the Sharkskin Defect and its Development with the Flow Conditions**
- Modifying Threadline Dynamics in the High-speed Melt Spinning Process
- Computer Simulation of Multi filament Air Jet Melt Spinning
- Structure Development in the Melt Spinning and Drawing of Poly p Phenylene Sulfide Fibers
- Cast Film Extrusion of Polypropylene Films
- Air Ring Effect on Blown Film Dynamics
- Computer Simulation of Melt Viscoelasticity Functions for Binary Polyblends
