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Studies on the Effect of Pellet Size on Positive Conveying in Helically Grooved Single Screw Extruders

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Published/Copyright: September 9, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 28 Issue 3

The helical grooved barrel feed section permits, when the barrel channel aspect ratio and the barrel channel helical angle are properly designed, an operating mode where the positive conveying is prevailing. While the pellet size of materials is varied, different dimension relationships of the barrel channel depth and pellet size could induce different equivalent barrel channel aspect ratios with the transformation of solids conveying mechanisms from the positive conveying to the friction-drag conveying. Considering the effect of dimension relationships on the solids conveying mechanism, a novel pellet-size physical model was established to guide the available design of the barrel channel geometry for positive conveying. In the pellet-size model, one or two shear interfaces were identified inside the solid-plug resulting in different equivalent barrel channel aspect ratios, based on which the solids conveying mechanism on the shear interfaces was detailed by the boundary condition equations for positive conveying. Besides, the theoretical simulations are also compared with the on-line measuring experimental data. The results show that the equivalent barrel channel aspect ratio on the shear interfaces exists indeed and determines the solids conveying mechanism, which is well confirmed by the excellent consistence between the predicted and measured data.

2 Mail address: Ping Xue, Institute of Plastic Machinery and Engineering, Beijing University of Chemical Technology, Beijing, PRC, 100029, E-mail:

References

SchneiderK., “Reibverhalten von Kunststoffgranulat”, Kunst. Ger. Plast., 59, 97–102 (1969)Search in Google Scholar

ChungC. I., “Plasticating Single-screw Extrusion Theory”, Polym. Eng. Sci., 11, 93–98 (1971). 10.1002/pen.760110204Search in Google Scholar

BroyerE., TadmorZ., “Solids Conveying in Screw Extruders Parts I: A Modified Isothermal Model”, Polym. Eng. Sci., 12, 12–24 (1972)10.1002/pen.760120103Search in Google Scholar

RautenbachR., “Model Tests on the Transport of Plastics Powders in the Feed Section of Single-screw Extruders”, Kunst. Ger. Plast., 69, 6–8 (1979)Search in Google Scholar

GrünschloßE., “Calaulation of the Mean Coefficient of Barrel Friction in Grooved Feed Sections”, Kunst. Ger. Plast., 74, 24–26 (1984)Search in Google Scholar

RauwendaalC., SikoraJ., “The Adjustable Grooved Feed Extruder”, Plast. Add. Compound., 2, 26–30 (2000)10.1016/S1464-391X(00)88882-0Search in Google Scholar

KowalskaB., “Grooved Feed Sections”, Kunst. Plast. Eur., 90, 10–11 (2000)Search in Google Scholar

SikoraJ., “The Effect of the Feed Section Groove Taper Angle on the Performance of a Single-screw Extruder”, Polym. Eng. Sci., 41, 1636–1643 (2001). 10.1002/pen.10861Search in Google Scholar

KramerA., “Experience in Using Extruders with Grooved Feed Zones”, Kunst. Ger. Plast., 78, 21–26 (1988)Search in Google Scholar

MiethlingerJ., “Modeling the Solids Feed Section in Grooved-feed Extruders”, Kunst. Plast. Eur., 93, 49–53 (2003)Search in Google Scholar

SchlafliD., ZweifelY., “Barrier Screws in Helically Grooved Barrels: Operating Characteristics and Implications for Simulation Models”, SPE ANTEC Tech. Papers, 171, 195–199 (2001)Search in Google Scholar

PotenteH., SchoppnerV., “A Throughput Model for Grooved Bush Extruders”, Int. Polym. Proc., 4, 289–295 (1995)Search in Google Scholar

PanL., JiaM. Y., XueP., WangK.-J., JinZ. M., “Studies on the Positive Conveying in Helically Channeled Single Screw Extruders”, Exp. Polym. Letters, 7, 543–560 (2012)10.3144/expresspolymlett.2012.Search in Google Scholar

Received: 2012-9-19
Accepted: 2013-1-29
Published Online: 2013-09-09
Published in Print: 2013-07-01

© 2013, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. Climatic Ageing of Components of Polymer Based Electrochromic Devices
  5. Previous Experimental Polymer Rheology Versus Flow Induced Crystallization
  6. Studies on the Effect of Pellet Size on Positive Conveying in Helically Grooved Single Screw Extruders
  7. Distortion of Interfaces in a Multilayer Polymer Co-extrusion Feedblock
  8. Preparation and Characterization of PES and PA Composite Membranes for Air Separation at Low Pressures
  9. Impact of Feed Opening Width and Position on PVC Extrusion Process Effectiveness
  10. Irradiation Strategy for Laser Transmission Welding of Thermoplastics Using High Brilliance Laser Source
  11. Polytetrafluoroethylene Paste Extrusion: A Fibrillation Model and Its Relation to Mechanical Properties
  12. Improving Weld Line Strength of Fiber Reinforced Plastics By Means of A “Flow Disruptor”
  13. Application of the Network Simulation Method to Flat Dies with Inverted Prelands
  14. In Situ Polymerization of PET in the Presence of Pristine and Organo-modified Clays
  15. Rapid Communications
  16. Accurate Bio-scaling Processing of Micro Structured Shark Skin Based on Swelling of Polydimethylsiloxane
  17. PPS News
  18. PPS News
  19. Seikei Kakou Abstracts
  20. Seikei Kakou Abstracts
https://doi.org/10.3139/217.2709

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. Climatic Ageing of Components of Polymer Based Electrochromic Devices
  5. Previous Experimental Polymer Rheology Versus Flow Induced Crystallization
  6. Studies on the Effect of Pellet Size on Positive Conveying in Helically Grooved Single Screw Extruders
  7. Distortion of Interfaces in a Multilayer Polymer Co-extrusion Feedblock
  8. Preparation and Characterization of PES and PA Composite Membranes for Air Separation at Low Pressures
  9. Impact of Feed Opening Width and Position on PVC Extrusion Process Effectiveness
  10. Irradiation Strategy for Laser Transmission Welding of Thermoplastics Using High Brilliance Laser Source
  11. Polytetrafluoroethylene Paste Extrusion: A Fibrillation Model and Its Relation to Mechanical Properties
  12. Improving Weld Line Strength of Fiber Reinforced Plastics By Means of A “Flow Disruptor”
  13. Application of the Network Simulation Method to Flat Dies with Inverted Prelands
  14. In Situ Polymerization of PET in the Presence of Pristine and Organo-modified Clays
  15. Rapid Communications
  16. Accurate Bio-scaling Processing of Micro Structured Shark Skin Based on Swelling of Polydimethylsiloxane
  17. PPS News
  18. PPS News
  19. Seikei Kakou Abstracts
  20. Seikei Kakou Abstracts
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