Tinius Olsen MP1200 Extrusion Plastometer Page 13-7
Operation Manual # 02002215
not dump it in all at once as it will melt and stick to the funnel. Press Continue
when finished.
13.3.7 NOTE: The ASTM D 1238 Method allows one minute to charge the cylinder,
insert the piston, and start the preheat time of test.
CAUTION: The funnel, when placed in the cylinder, can become extremely hot when
the machine is at operating temperature! The time that the funnel is allowed to sit in the
cylinder should be kept to a minimum.
13.3.8 After charging the cylinder, reinsert the piston and place the appropriate
weight on the piston. Press Start to move to the next screen.
NOTE: Materials with high melt flows may require the orifice to be plugged in addition to
supporting the weight. Use the optional Tinius Olsen High Melt Flow Orifice Plug (TO P/N
02001455).
13.3.9 The next screen will countdown the previously entered preheat time. At the
end of the preheat time an alarm will sound (if enabled). At that time, the first
(lower) scribe line on the piston rod should be close to entering the guide
collar. ASTM D 1238 requires a preheat time of 7 +/- 0.5 minutes (420 +/- 30
seconds). If the scribe line has not entered the guide collar during the
preheating period, the amount of material charged should be reduced.
Alternatively, the material in the cylinder can be manually purged. Manual
purging must be completed 2 minutes before the first capture (sample) is
taken.
13.3.10After the first scribe line on the piston disappears into the cylinder, use the
cutoff tool to cut off the material that has extruded from the orifice during the
preheating period, while at the same time pressing the Start button (All cut-
offs must be made directly at the bottom of the orifice. This is the actual start
of the test.
To Next Page
