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Rules of Thumb

Modified on Monday, 02 February 2015 12:48 PM by mpieler Categorized as Extrusion Hints
Rules of Thumb
Vol. 25 #3, Dec. 1998

As we constantly strive for more output, we can and do cause problems in melt quality and rate. Some simple reminders:

  • An increase of 1000 psi will increase melt temperature normally from 5 to 30 deg. F.
  • Higher pressure will improve mixing.
  • Higher pressure will increase die swell.
  • Higher pressure may reduce rate per rpm.
  • An increase of 10% screw speed will increase melt temperature by approximately 5% and an increase in screw speed will eventually result in poor melting, uneven melt, and surging.

- Mark Sewak, LCI Corp.

See also:
  • High motor amps
  • Monitor back pressure
  • Pressure increases temperature
  • Pressure transducers 2
  • Profile die design

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