Testing The Polymer - Ametek Davenport PET Plus User Manual

Note that the plastic tubes MUST still be at-
tached to the quick release connectors and the
vacuum pump MUST be left running.
Dried samples of polymer can remain in the
parking area for up to 24 hours before testing
with the vacuum pump running. Therefore, a
number of samples, from 1 to 6, can be dried at
the same time.

10.7TESTING THE POLYMER

NoTE: It is very important that the Die, the Barrel and the Follower are scrupulously clean
and have been assembled correctly after cleaning.
It is also important that the PET Plus is set to the "Pre-Test" screen ready for testing.
THIS PROCEDURE IS PART OF THE MAIN PROCEDURE SHOWN IN SECTION 7.7.
Select a sample phial and turn the vacuum valve
in the plastic vacuum tube to closed (lever is at
90 degrees to the vacuum pipe).
Press the release lever on the front of the quick
connector so that the metal tube springs up out
of the connector.
Note that the quick release connector has a
sealing valve so that the vacuum is not released
from the other sample phials.
Press the key under PURGE to allow a low
volume of nitrogen gas to flow through the barrel
to displace any air that may be present. Allow
the gas to flow for a few seconds to ensure that
the barrel is full of nitrogen.
Place the long filling funnel into the top of the
barrel. Note that the long funnel prevents the
powder sticking to the sides of the barrel.
Also note that the funnel must be cold or the
powder may stick to the funnel.
Place the open metal end from the sample phial
into the top of the filling funnel.
Open the vacuum valve in the plastic vacuum
tube (lever is in line with the vacuum pipe) to
release the vacuum. A slight hissing sound will
be heard as the vacuum draws hot dry nitrogen
into the sample phial.
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