Dynisco 4004 User Manual

 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, the sample extrudate is so
slow that one does not reach the flag before 8 minutes has expired one must
either:
 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 for Method A can also be used here
for Method B testing.
Cleaning Up
NOTE: There is a 1/4" calibration flag that is higher (closer to the hole) on the
flag and used only for calibration purposes. Do not use this flag in normal
testing.
Push down on the weight and purge any material remaining in the barrel.
Remove the rod by twisting it clockwise to break the seal created by the molten
plastic then pull straight up. Warning: If you pull the rod out too quickly you
may cause a suction the pulls the die out along with it. Wipe the plunger rod
with a cotton rag. Remove the die with the die removal tool. Put two patches
directly over the barrel about 1/2 way overlapped and, using the cleaning tool,
push the patch down into the barrel. Run the patch up and down a half dozen
times or so, then repeat the process. A minimum of two sets of patches are
generally needed to clean the barrel properly, however, some materials are
harder to clean that others. Repeat the process until used patches come out
clean. When the system is clean, put the die and plunger back into the barrel.
This allows the plunger and die to heat up before the next test.
With materials that are thermally stable (less than 5% viscosity change
over 1/2 hour) we recommend only cleaning the barrel between runs of the
exact same material. For materials that degrade or are moisture sensitive it is
recommend that both the barrel and the die be cleaned completely. To clean the
die, use the die removal rod and push the die up from the bottom of the barrel
and out the top. Wipe it with the cotton rag and clean it by running the drill bit
through it several times. Remove material that collects in the grooves of the drill
bit and repeat until the drill passes easily through the die. Scrape the die with
the cutting knife if needed to clean the top and bottom faces. For materials that
crystallize quickly you can clean the die by first running a drill bit up into the
die while it is hot and in the indexer. This will make it much easier to get the
cleaning drill bit in when the die is removed and the material starts to solidify.
USER TIP: Experienced users often listen for the double bounce of the die
when they drop it back into the barrel to know that the barrel is clean.
Also, while the die is out look down the barrel bore to be sure it is clean (use
safety glasses when looking down the barrel!). The inside surface of the barrel
is smooth and shiny when completely clean.
If you don't use gloves you will eventually get burned. If you are using a PVC
die (D3364 unstable materials) be sure to get the material out of the conical top
Series 4000 Melt Indexer Operation Manual Method "B" Run  37

Dynisco 4004 Specifications

General

Brand	Dynisco
Model	4004
Category	Laboratory Equipment
Language	English