Comparison between LDPE Conventional and Autothermal Extrusion Characteristics
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J. W. Sikora
Abstract
In the paper, a characterization of autothermal and conventional extrusion processes of low density polyethylene (LDPE) in the typical single screw extruder equipped with a classical screw was presented. It was shown that autothermal (adiabatic) extrusion process is characterized by better effectivity factors than a conventional extrusion process carried out in the same basic extrusion conditions. In both processes the mass flow rate, total extruder power, total energy consumption per unit mass, extruder energy efficiency, extrusion velocity, temperature distribution along the plasticating system and extruder head, were compared. The attempt to present shear stress and flow rate distribution during laminar and isothermal flow of the non-Newtonian fluid through the circular channel (extrusion die) was undertaken. Appropriate dependences of experimental factors on the rotational speed and angular frequency of the screw were made. Appropriate conclusions were drawn.
© 1998, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- J. A. Biesenberger, G. Astarita, D. C. Bogue
- Screw Extrusion/Mixing
- Modeling Solids Conveying in Polymer Extruders
- Comparison between LDPE Conventional and Autothermal Extrusion Characteristics
- Transesterification of Ethylene Acetate Copolymer in a Twin Screw Extruder
- Stabilising the Structure of HDPE by the Use of Highly-dispersed Mixture of Fe/FeO
- Pumping Characteristics of an Intermeshing Co-rotating Twin Screw Extruder
- Flow Behaviour of Blends of Poly(ethylene-Co-Acrylic Acid) and Epoxidised Natural Rubber
- Die Extrusion
- Rheological Behaviour of HDPE/PA 11 Blends
- Melt Flow Properties of LDPE/HDPE Blends in Capillary Extrusion
- Fibers and Film
- Rheological Behaviour of LLDPE/LDPE Blends under Elongational Deformation
- Processing/Structure Relationships of Mica-Filled PE-Films with Low Oxygen Permeability
- On the Charge State of Melt-Blown Polymer Materials
- Temperature Measuring in Plastics Processing with Infrared Radiation Thermometers
- Comparative Study of Structure Development in Melt Spinning Polyolefin Fibers
- Moulding
- Sintering Rheology of Semi-Crystalline Polymers
- Molding
- Melt Flow Instabilities of Filled HDPE
- Experimental Validation of Shrinkage Predictions for Injection Molded Products
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- J. A. Biesenberger, G. Astarita, D. C. Bogue
- Screw Extrusion/Mixing
- Modeling Solids Conveying in Polymer Extruders
- Comparison between LDPE Conventional and Autothermal Extrusion Characteristics
- Transesterification of Ethylene Acetate Copolymer in a Twin Screw Extruder
- Stabilising the Structure of HDPE by the Use of Highly-dispersed Mixture of Fe/FeO
- Pumping Characteristics of an Intermeshing Co-rotating Twin Screw Extruder
- Flow Behaviour of Blends of Poly(ethylene-Co-Acrylic Acid) and Epoxidised Natural Rubber
- Die Extrusion
- Rheological Behaviour of HDPE/PA 11 Blends
- Melt Flow Properties of LDPE/HDPE Blends in Capillary Extrusion
- Fibers and Film
- Rheological Behaviour of LLDPE/LDPE Blends under Elongational Deformation
- Processing/Structure Relationships of Mica-Filled PE-Films with Low Oxygen Permeability
- On the Charge State of Melt-Blown Polymer Materials
- Temperature Measuring in Plastics Processing with Infrared Radiation Thermometers
- Comparative Study of Structure Development in Melt Spinning Polyolefin Fibers
- Moulding
- Sintering Rheology of Semi-Crystalline Polymers
- Molding
- Melt Flow Instabilities of Filled HDPE
- Experimental Validation of Shrinkage Predictions for Injection Molded Products
