Use a flow plug
Reduce the test load (e.g. 2160 to 225 g)
Reduce the test temperature (e.g. 230 to 190 C)
Support the plunger and piston during melt time
Change to a non-standard die (e.g., 1/2 diameter, 1/2 height)
The first two are typically used. If, on the other hand, if the sample extrudate is
so slow that you do not reach the flag before 8 minutes has expired you must
take one of the following actions:
Add less material
Increase the test load (e.g. 2160 to 21,600 g)
Increase the test temperature (e.g. 190 to 230 C)
Change to a non-standard die (typically larger diameter)
Since Dynisco Polymer Test flags start at the same position as the first
scribe mark, the amount of sample charge works for both Method A and Method
B testing.
Making the Cut
When the lower scribe mark on the plunger reaches the top of the guide bushing
simultaneously cut the extrudate and press RUN. Use the cutting knife in a
wiping like action up against the bottom of the die. After pressing RUN, a
countdown timer appears on the left of the front display. As it counts down it
will give a warning beep when 10 seconds remain. Exactly when it reaches zero
and beeps cut the extrudate up against the bottom of the die, as before. Weigh
the sample and enter the weight in grams using the touch panel then press YES.
You may have to wait for the flag to traverse the photo eye for slow flowing
materials. A precision balance is needed in order to obtain correct flow rate
measurements. The flow rate and melt density will be immediately calculated
and displayed. A extrudate weight of about 1.0 gram or more will reduce
weighing errors, adjust the cut time as needed to get at least 0.5 grams of
material.
If the indexer has printing capability, flow rate will be printed along
with other test details. When multiple tests have been completed an average,
standard deviation and coefficient of variance can be printed once, when the
END key is pressed.
Cleaning Up
Your data
Clean up is the same as that for Method A.
Data will be displayed on the VFD or printed if you have the printer option.
Follow the prompts on the VFD to END or SAVE the run.
Series 4000 Melt Indexer Operation Manual Method "A/B" Run
31
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