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Single and Double Bubble Tubular Film Extrusion of Polybutylene Terephthalate

  • K. Song and J. L. White
Published/Copyright: February 23, 2022
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International Polymer Processing
From the journal International Polymer Processing Volume 15 Issue 2

Abstract

An experimental study of film formation and structure development of polybutylene terephthalate (PBT) in single and double bubble tubular film extrusion processes is presented. PBT was found largely stable in the first stage. In the second stage, the bubble was unstable and biaxial inflation was achieved only with a blow-up ratio of one. The sources of second bubble instabilities were related to the crystalline nature of the first bubble being inflated in the second stage. The structure and properties in the films varied substantially with processing conditions. While the first bubble had poorly ordered α-structure, the double bubble possessed oriented polymorphic texture. The second deformation that induced high film-line stress favored the formation of a stable β phase. The mechanical behavior of the films reflected the crystal perfection as well as orientation in the films.

Prof. Dr. J. L. White, Institute of Polymer Engineering, University of Akron, Akron, OH-44325-0301, USA

Acknowledgements

The authors wish to thank BASF Co. and Hoechst Celanese Co. for supplying the polymer resins studied. They also give special thanks to Mr. M.D. Crist, Dr. K. Mühlbach and Mr. J.J. Ocampo at BASF Co. for their useful discussions concerning the processing of the polymers.

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Received: 1999-02-22
Accepted: 1999-12-26
Published Online: 2022-02-23

© 2000 Walter de Gruyter GmbH, Berlin/Boston, Germany

Articles in the same Issue

  1. Contents
  2. Editorial
  3. Second of a Series: Pioneering Polymer Industry Developments—The IG Farbenindustrie and the Establishment of Synthetic Rubber
  4. Screw extrusion/mixing
  5. Analysis of Mixing in Corotating Twin Screw Extruders through Numerical Simulation
  6. Melt Conveying in Co-rotating Twin Screw Extruders
  7. The Adjustable Grooved Feed Extruder
  8. Reactive Extrusion
  9. Hydrolytic Depolymerization of Polyethylene Terephthalate by Reactive Extrusion
  10. Effect of Conversion on Chain Addition Copolymerizations Performed in a Backmixed Drag Flow Extruder Reactor
  11. Fiber and film
  12. Single and Double Bubble Tubular Film Extrusion of Polybutylene Terephthalate
  13. Molding
  14. Viscoplastic Material Modeling for the Stretch Blow Molding Simulation
  15. The Effects of Compression Pressure on Injection Compression Molding
  16. Numerical Simulation of Compression Molding of UHMWPE
  17. Numerical Simulation of Compression Molding of UHMWPE
  18. Mechanical Properties of Isotactic Polypropylene with Oriented and Cross-hatched Lamellae Structure
  19. Morphological Characterisation of Long Glass Fibre Composites for the Thermoforming Process
  20. PPS News
  21. PPS News
  22. Professional news
  23. New Petrochemical Complexes
https://doi.org/10.1515/ipp-2000-0007

Articles in the same Issue

  1. Contents
  2. Editorial
  3. Second of a Series: Pioneering Polymer Industry Developments—The IG Farbenindustrie and the Establishment of Synthetic Rubber
  4. Screw extrusion/mixing
  5. Analysis of Mixing in Corotating Twin Screw Extruders through Numerical Simulation
  6. Melt Conveying in Co-rotating Twin Screw Extruders
  7. The Adjustable Grooved Feed Extruder
  8. Reactive Extrusion
  9. Hydrolytic Depolymerization of Polyethylene Terephthalate by Reactive Extrusion
  10. Effect of Conversion on Chain Addition Copolymerizations Performed in a Backmixed Drag Flow Extruder Reactor
  11. Fiber and film
  12. Single and Double Bubble Tubular Film Extrusion of Polybutylene Terephthalate
  13. Molding
  14. Viscoplastic Material Modeling for the Stretch Blow Molding Simulation
  15. The Effects of Compression Pressure on Injection Compression Molding
  16. Numerical Simulation of Compression Molding of UHMWPE
  17. Numerical Simulation of Compression Molding of UHMWPE
  18. Mechanical Properties of Isotactic Polypropylene with Oriented and Cross-hatched Lamellae Structure
  19. Morphological Characterisation of Long Glass Fibre Composites for the Thermoforming Process
  20. PPS News
  21. PPS News
  22. Professional news
  23. New Petrochemical Complexes
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