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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