Tinius Olsen MP1200 - Page 73

Tinius Olsen MP1200 Extrusion Plastometer Page 14-3
Operation Manual # 02002215
14.2.7 Press the Test Load box. Again, a keypad is shown next. Enter the desired
test load. Press the DONE button when finished.
14.2.8 Press the Orifice Diameter box. Again, a keypad is shown next. Enter the
desired orifice diameter. The nominal orifice diameter for ASTM D 1238 is
2.095 mm (0.0825 in.). Enter the numeric value of the orifice diameter to
have Shear Stress calculated. Press the DONE button when finished.
14.2.9 Press the Orifice Length box. Again, a keypad is shown next. Enter the
desired orifice diameter. The nominal orifice length for ASTM D 1238 is 8.00
mm (0.315 in.). Press the DONE button when finished.
14.2.10Press the Preheat box. Again, a keypad is shown next. Enter the desired
preheat period. ASTM D 1238 requires a preheat time of 7 +/- 0.5 minutes
(420 +/- 30 seconds). However, refer to the appropriate ASTM material
specification to determine the recommended preheat time for the material that
is to be tested. Enter 390 seconds (minimum preheat time) or other
appropriate time. Press the DONE button when finished.
NOTE: If the MWLD is being used in a test, the Preheat time may be used as a release time for
the weight lift platform. Set the release time (which is dependent on the expected flow rate
and may take some experimentation to determine the proper value) so that the test starts
7 min +/- 30 seconds after the test starts.
14.2.11Press the CONTINUE button to go to the next screen.
14.2.12Press the Entered button next to MELT DENSITY TYPE (assuming that the
melt density value for the material being tested is known).
14.2.13Press on the Entered Value box and use the keyboard that appears to enter
the melt density value.