THE DESIGN OF DIES FOR HIGH-SPEED WIRE COATING,

Abstract

It was shown experimentally that the critical shear rate was increased by using smaller taper angles in the flow channel and by improving the flow properties. Improved flow properties can also be obtained by using a higher melt index resin or higher melt temperatures. It was shown that there was an optimum land length, and in this case the ratio of land length to orifice diameter was 11.34. Further work is being done to determine if the same ratio holds for different orifice sizes and if small tapers just prior to the land affect the land length. Thus, for a particular polyethylene, a die for high-speed wire coating can be designed successfully by giving proper consideration to the programming of the rate of increase in shear rate, the effect of the angles and lengths of the tapers, and the ratio of the land length to the orifice diameter. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1959
Accession Number
AD0656238

Entities

People

  • L. R. Hammond

Tags

DTIC Thesaurus Topics

  • Computer Programming
  • Computing-Related Activities
  • Diameters
  • Dielectric Polymers
  • Dielectrics
  • Geometry
  • Macromolecules
  • Materials
  • Mathematics
  • Molecules
  • Physical Properties

Readers

  • Combustion and Flow Dynamics.
  • Polymer Science and Engineering.