Gear Pump Performance in Polypropylene Filament Yarn Uniformity
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B. B. Shumpert
Abstract
We report the development of a high resolution computerized monitoring system for fiber melt spinning and the results of its application to polypropylene fiber production. Variation in pack pressure caused by the melt pump was found to significantly affect the uniformity of the filament linear density. In this study, the variation in the pack, or gear pump outlet, pressure during polypropylene fiber melt spinning is correlated with various process parameters and the resulting fiber characteristics. We found the coefficient of variation in pump discharge pressure to decrease with increasing pump capacity and pump speed. The coefficient of variation in pack pressure was directly correlated with the coefficient of variation in filament yarn uniformity. Pump wear was found to have a marked impact on the variance in pack pressure.
© 1996, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- First in a Series: Pioneers of Polymer Processing: Thomas Hancock – The First Polymer Processing Innovator
- Mixing
- The Extensional Flow Mixer, EFM
- Reactive Extrusion
- Continuous Polymerization of Caprolactam-Polyether Sulfone Solutions in a Twin Screw Extruder to Form Reactive Polyamide–6/Polyether Sulfone Blends and Their Melt Spun Fibers
- Biodegradable Poly(Lactic Acid) with High Molecular Weight
- Acceleration of Chemical Reaction in Reactive Extrusion Accompained by Devolatilization
- Fibers and Films
- Viscous-Elastic Effects in a PA 6 Melt – Cause of Unevennesses in Melt-Spun Yarns**
- Gear Pump Performance in Polypropylene Filament Yarn Uniformity
- Molding
- Physically-Based Model of Thermoplastics Injection Molding for Control Applications
- Effect of Pressure and Shear Stress on Crystallization Behaviors in Injection Molding
- The Crystallinity of PVC and its Effect on Physical Properties**
- Molecular Orientation in Polycarbonate Induced by Cooling Stresses
Articles in the same Issue
- Contents
- Contents
- Editorial
- First in a Series: Pioneers of Polymer Processing: Thomas Hancock – The First Polymer Processing Innovator
- Mixing
- The Extensional Flow Mixer, EFM
- Reactive Extrusion
- Continuous Polymerization of Caprolactam-Polyether Sulfone Solutions in a Twin Screw Extruder to Form Reactive Polyamide–6/Polyether Sulfone Blends and Their Melt Spun Fibers
- Biodegradable Poly(Lactic Acid) with High Molecular Weight
- Acceleration of Chemical Reaction in Reactive Extrusion Accompained by Devolatilization
- Fibers and Films
- Viscous-Elastic Effects in a PA 6 Melt – Cause of Unevennesses in Melt-Spun Yarns**
- Gear Pump Performance in Polypropylene Filament Yarn Uniformity
- Molding
- Physically-Based Model of Thermoplastics Injection Molding for Control Applications
- Effect of Pressure and Shear Stress on Crystallization Behaviors in Injection Molding
- The Crystallinity of PVC and its Effect on Physical Properties**
- Molecular Orientation in Polycarbonate Induced by Cooling Stresses
