OF INCREASING THE PLASTICATING EFFICIENCY Lublin, 27 January 2017, - PowerPoint PPT Presentation

Mar 03, 2024 •186 likes •411 views

Lublin University of Technology, Poland Department of Polymer Processing Janusz W. Sikora CONSTRUCTIONAL METHODS OF INCREASING THE PLASTICATING EFFICIENCY Lublin, 27 January 2017, NEWEX project METHODS of increasing the efficiency of

Lublin University of Technology, Poland Department of Polymer Processing Janusz W. Sikora CONSTRUCTIONAL METHODS OF INCREASING THE PLASTICATING EFFICIENCY Lublin, 27 January 2017, NEWEX project
METHODS of increasing the efficiency of plasticating Constructional Technological • Rotational screw speed • Screw construction • Temperature distribution • Barrel construction along the length of the plasticizing unit
 diameter of the screw  pitch of the screw  number of helical lines  channel height  channel width  taper angle of the helical line Skokowa zmiana
SCREW CONSTRUCTION Elements of intensive mixing and shearing EFFECTS • Improvement of polymer homogenization • Increase of polymer temperature • Decrease of polymer pressure • Decrease of output rate All on short length of plasticizing unit
LOCATION • Melting and metering zone • Screw end • Between the plasticizing unit and die
MIXING ELEMENT PIONEER C. Maillefer, 1960 CALLING NAME Barrier flight IDEA Increase of mixing in the polymer flow through forced:  Separating and joining of polymer flows  Rotation of polymer flows Mixing always together with shearing
SOLUTIONS Constructional forms  classical
 modified Semmekrot’s element Saxton’s element Dulmage’s element Pineapple’s element
1 – mixer components – rods, 2 – back die body, 3 – front die body, 4 – die channel, 5 – joining sleeve
SHEAR ELEMENT PIONEER G.H. LeRoy and B. H. Maddock, 1967 „Union Carbide”, USA CALLING NAME Maddock ring IDEA Increase of shear in polymer flow through forced gap flow Shear occurs always together with mixing
SOLUTIONS Constructional forms  classical: rings with longitudinal or helical grooves  modified: short barrier rings
Additional barrier flights a) Maillefer screw, b) Barr screw, c) Dray screw, d) Kim screw, e) DFM screw
BARREL CONSTRUCTION EFFECTS • Increase of output rate • Increase of polymer pressure • Increase of polymer temperature All on short length of plasticizing unit Już w latach
PIONEER G. Fuchs, 1968, „Badischen Anilin & Soda - Fabrik AG”, Germany CALLING NAME Grooved feed section IDEA Increase of polymer friction in the feeding zone through polymer forced movement along the grooves
SOLUTIONS Constructional forms  Passive grooved feed section (grooved feed section in which constructional features are constant during the extrusion process)  Active grooved feed section (possibility to change the constructional features during the extrusion process)
 Active grooved feed section Parameters of active grooved feed section: - Number of grooves, - Taper angle, - Depth of grooves, - Direction of grooves torsion, - Torsional angle, - Shape of grooves cross-section PIONEER P. Meyer, 1983, USA Patent No 4 462 692 There are few patents, most of them from the USA
Longitudinal section of grooved feed zone Grooved feed zone
The latest concept of increasing the efficiency Rotational barrel segment Location: in the melting zone, where most heat is needed
THANK YOU FOR YOUR ATTENTION

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