LCR7000 & RHEOSIGHTS P/N: 974194 |
Rev: A
|
ECO: 52468
www.dynisco.com
From lab to production,
providing a window into the process
-116-
section). When melt time expires, the system then moves at
whatever speed is necessary to keep 900N on the load cell (or
pressure transducer). When position 127.5 mm is reached an
internal timer is started. When position 132.5 mm is reached the
time is stopped and the second point in the test starts (after any
delay time pause).
Terminal Force
Terminal force is a software protection force for the
rheometer. If the
Terminal Force
is observed by the
rheometers on board computer, it will abort the test. The
plunger movement will stop; the rheometer will try to purge
the barrel of its contents. If it cannot, the crosshead will return
to start position. The terminal force also controls the
maximum force allowed during the purging of material from
the barrel. The speed of purging will be automatically adjusted
so that the maximum amount of force applied is half the
terminal force. (if you are having trouble purging the
rheometer) Normally this value is set just below your load cell
capacity (e.g. 1000 LB cell set to 990 LB).
Test Delay
The
Test Delay
is a stop in plunger movement between each
test point for a specified number of seconds. The total delay
between two data points will be the delay time plus the actual
plunger movement time. For example, if all rates are 8
mm/min and all positions are 8 mm apart then the
measurement time is 1.0 minutes plus an additional
Test Delay
of 180 seconds would make the total time between points 4.0
minutes. For thermal degradation runs increase or decrease
the
Test Delay
and or the number of points in the test to
achieve the total time needed to quantify the degradation.
