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The Degradation Factor is the reduction of IV per minute so a value of 0.010 means that the polymer
has degraded by 0.010 IV per minute during the test. This value indicates how the polymer may
degrade inside the production extruder.
Therefore, if the polymer stays within the heated zone of the production extruder for 3 minutes, the IV
will drop by an estimated 0.03.
The test result should normally be saved into the internal memory so that the statistics can be
calculated. If, for any reason the result is not to be stored, it can be deleted.
When either action is selected by pressing the relevant key, the "Pre-Test" screen is re-displayed as
below.
The equipment is now ready for cleaning.
7.11 CLEANING THE BARREL
Ensure that the pressure displayed on the screen is nominally zero.
Using heat-protecting gloves, remove the probe from the barrel and, if necessary, wipe any polymer
from the tip.
Store the probe in the probe holder at the right
hand side of the vertical column.
Ensure that the body of the probe rests onto
the probe holder so that the large knurled nut is
below the holder.
Unscrew the die retaining nut from the bottom of
the barrel with the tool provided. Note that the
die will NOT be attached to the die retaining nut.
Insert the charging tool into the top of the barrel
until it touches the top of the follower.
Gently push downwards on the barrel cleaning
tool until the die is pushed out of the bottom of
Shown: Top of PET Plus with probe holder
the barrel.
Remove the charging tool from the top of the barrel.
Hold the die with tweezers then remove any polymer from the sides and faces using a sharp blade.
WARNING: Wear cut-resistant gloves when cleaning.
48 PET Plus User Manual
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