Tinius Olsen MP1200 Extrusion Plastometer Page 15-9
Operation Manual # 02002215
tool (P/N 02001582) in order to remove some of the trapped air. (Depending
on the amount of material to be charged, you may have to tamp the material
down more than once to load it all into the cylinder). Reinsert the piston,
rotate the PPDT clockwise so that the end of the arm is close to the piston
rod, and place the appropriate weight on the piston (either manually or with
the WLD (MP1200M only). 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).
15.3.8 The next screen will countdown the previously entered preheat time and show the
total elapsed 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. 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 end 2
minutes before the start of the first capture.
TEST TIP: When testing materials with high melt flow rates (> 10g/10 minutes), the
weight platform of the WLD can be used to prevent excessive polymer from running out of
the cylinder prior to the end of the preheating period. The actual position of the weight
support platform will vary with flow rate. One example is to lower the weight platform so
that the top surface of the platform is approximately 25 mm (1 inch) above the 46 mm
(1.81 inch) start position of the test measurement. The weight platform will now catch the
weight as it falls and support it, temporarily reducing the load on the material in the
cylinder. When the Release Time reaches 420 seconds (or other time entered above in
13.2.13), the weight platform will lower fully and allow the test to continue. Note that to
achieve the total preheat time of 420 +/- 30seconds, it may be necessary to reduce the
Release Time. The total time from start of test to the start of test measurement can be
observed by watching the elapsed time “ET” display.
15.3.9 The Elapsed Time display will reset to zero and begin to count up, in seconds.
Material will begin to extrude through the orifice.
CAUTION: If the optional WLD is being used in the automatic mode, and the Weight
Support has been programmed to run to a height less than its maximum height, the
weight platform will automatically begin to lower the weight(s) when the START button is
pressed. Keep hands clear!
15.3.10When the elapsed time reaches the preheat time that was entered in 15.2.10,
an alarm will sound (if enabled). The first (lower) scribe line on the ASTM
piston rod should now be close to entering the guide collar.
CAUTION: If the optional WLD is being used, and has been set to “Yes”, the WLD weight
support platform will automatically begin to lower the weight(s) at the end of the
preheating period (Release Time), provided that they have not already been lowered all
the way at the start of the test. Keep hands clear!
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