Melt Temperatures and Residence Times in an Extruder by Infrared Spectroscopy
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T. Nietsch
Abstract
This article presents melt temperature measurements with an infrared thermometer during extrusion and investigates the influence by the surface emissivity and the rotating screw. This influence can be used for on line residence time measurements in the extruder line, to measure the number of revolutions of the screw, and to measure both the surface temperature and the bulk's temperature.
The results show that colouring the PE with a high emisffisivity tracer allows us to measure the melt's surface temperature and minimise the influence of the rotating screw. Its influence is weaker in complete filled section as in partial filled sections of the extruder and the mean bulk's temperature is measured when the emissivity is lower than one.
Furthermore it is shown that it is possible to measure the residence time distribution on line with an infrared thermometer, by taking advantage of its sensibility on a changing surface emissivity. Measurements with classical methods shows the same residence time distribution as obtained with the infrared spectroscopy. The advantage of this method is its wide range of applications, such like as the use in pressure zones, for a wide range of temperature and to measure on line the local residence time distribution all along the screw.
© 1997, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Editorial
- Screw Extrusion/Mixing
- Melt Temperatures and Residence Times in an Extruder by Infrared Spectroscopy
- Continuous Mixing of Low Viscosity and High Viscosity Polymer Melts in a Modular Co-Rotating Twin Screw Extruder
- Flow Field Analysis of Both the Trilobal Element and Mixing Disc Zones within a Closely Intermeshing, Co-Rotating Twin-Screw Extruder
- A Composite Model for Solid Conveying, Melting, Pressure and Fill Factor Profiles in Modular Co -Rotating Twin Screw Extruders
- Temperature Rise in the Extrusion of Highly Viscous Composite Materials
- Simulation of Free Surface Flow in Partially Filled Internal Mixers
- Die Extrusion
- Processing of Sheath-Core and Matrix-Fibril Fibers Composed of PP and a TLCP
- Fibers and Films
- Experimental and Theoretical Study of Rectangular Fiber Melt Spinning
- Distributed Crystallinity Control during Cast Film Extrusion
- Application of Neural Networks to Analyze the Drawing Process of PET Films
- Molding
- Physically-Based Adaptive Control of Cavity Pressure in Injection Molding: Filling Phase
- In-Mould Shrinkage Measurements of PS Samples with Strain Gages
- The Occurrence of Flow Marks during Injection Molding of Linear Polyethylene
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Editorial
- Screw Extrusion/Mixing
- Melt Temperatures and Residence Times in an Extruder by Infrared Spectroscopy
- Continuous Mixing of Low Viscosity and High Viscosity Polymer Melts in a Modular Co-Rotating Twin Screw Extruder
- Flow Field Analysis of Both the Trilobal Element and Mixing Disc Zones within a Closely Intermeshing, Co-Rotating Twin-Screw Extruder
- A Composite Model for Solid Conveying, Melting, Pressure and Fill Factor Profiles in Modular Co -Rotating Twin Screw Extruders
- Temperature Rise in the Extrusion of Highly Viscous Composite Materials
- Simulation of Free Surface Flow in Partially Filled Internal Mixers
- Die Extrusion
- Processing of Sheath-Core and Matrix-Fibril Fibers Composed of PP and a TLCP
- Fibers and Films
- Experimental and Theoretical Study of Rectangular Fiber Melt Spinning
- Distributed Crystallinity Control during Cast Film Extrusion
- Application of Neural Networks to Analyze the Drawing Process of PET Films
- Molding
- Physically-Based Adaptive Control of Cavity Pressure in Injection Molding: Filling Phase
- In-Mould Shrinkage Measurements of PS Samples with Strain Gages
- The Occurrence of Flow Marks during Injection Molding of Linear Polyethylene
