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Crystallization Studies of LLDPE during Tubular Blown Film Processing

  • M. D. Bullwinkel , G. A. Campbell , D. H. Rasmussen , J. Krexa and C. J. Brancewitz
Published/Copyright: June 6, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 16 Issue 1

Abstract

The final physical properties of semi-crystalline blown films are highly dependent on the crystalline morphology and orientation of polymer chains within the film. Simultaneous on-line SALS (Small Angle Light Scattering) and IR (Infrared) temperature measurements were successfully used to study crystallization during tubular blown film extrusion of LLDPE. SALS patterns were recorded at various vertical positions along the bubble. For LLDPE, an undeformed spherelulitic structure is formed if the stress level during processing is not too high. The change in average scattered intensity with axial position can be described using multiple step Avrami kinetic processes in parallel. The first step accounts for crystal growth and corresponds to the well-known temperature plateau. The later processes start with the impingement of the growing spherulites and may reflect secondary crystallization and orientation processes. Because the magnitude of the average intensity is responsive to changes in process conditions, the on-line SALS system is potentially a useful tool for monitoring process-property interactions.

* Mail address: M. D. Bullwinkel, Dept. of Chem. Eng., Clarkson University, Potsdam NY 13699-5705, USA
Received: 2000-9-14
Accepted: 2000-12-7
Published Online: 2013-06-06
Published in Print: 2001-03-01

© 2001, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Editorial
  2. 10.3139/217.0101
  3. Invited Paper
  4. Polymer Processing Technology in the 21st Century from the Viewpoint of the Japanese Plastics Industry
  5. Screw Extrusion Blend
  6. Polymer Blends in Co-Rotating Twin-Screw Extruders
  7. Reactive Extrusion
  8. Polymerization of ∊-Caprolactone in a Twin Screw Extruder
  9. Fiber and Film
  10. Crystallization Studies of LLDPE during Tubular Blown Film Processing
  11. Numerical Study of Internal Bubble Cooling (IBC) in Film Blowing
  12. Modeling Heat Transfer with Crystallization in Rods and Filaments
  13. Molding
  14. Relevance of Crystallisation Kinetics in the Simulation of the Injection Molding Process
  15. Causes of Cracks in Petaloid Bottom of Carbonated PET Bottle
https://doi.org/10.3139/217.1624

Articles in the same Issue

  1. Editorial
  2. 10.3139/217.0101
  3. Invited Paper
  4. Polymer Processing Technology in the 21st Century from the Viewpoint of the Japanese Plastics Industry
  5. Screw Extrusion Blend
  6. Polymer Blends in Co-Rotating Twin-Screw Extruders
  7. Reactive Extrusion
  8. Polymerization of ∊-Caprolactone in a Twin Screw Extruder
  9. Fiber and Film
  10. Crystallization Studies of LLDPE during Tubular Blown Film Processing
  11. Numerical Study of Internal Bubble Cooling (IBC) in Film Blowing
  12. Modeling Heat Transfer with Crystallization in Rods and Filaments
  13. Molding
  14. Relevance of Crystallisation Kinetics in the Simulation of the Injection Molding Process
  15. Causes of Cracks in Petaloid Bottom of Carbonated PET Bottle
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