Table of Contents
Advertisement
7.10 wAIT UNTIL THE TEST HAS FINISHED
The test is now running.
The "Pre-Conditioning" part of the test allows the sample to heat up and become fluid and so start to
flow through the die. The pre-conditioning ends 3 minutes after the sample was first inserted into the
barrel then the "Speed Check" screen is displayed.
The Probe Speed should initially be between 0.5 and 1.0 (mm/min) and this is determined by the IV of
the polymer and the applied gas pressure.
A high IV polymer will require a high gas pressure and a low IV polymer will require a low gas pressure.
If the Probe Speed is below 0.5, the equipment will beep and display the screen below to request that
the gas pressure is increased. Increase the pressure using the pressure regulator on the right hand
side of the equipment until the probe speed is above 0.5.
If the Probe Speed is above 1.0, the equipment will beep and display the screen below to request that
the gas pressure is decreased.
If the pressure is too high, rotate the pressure regulator on the right hand side of the equipment
anti-clockwise, press the key under GAS OFF to release the pressure then press the same key (now
labelled GAS ON) to re-apply the pressure. Finally, increase the pressure, using the pressure
regulator, to give a probe speed below 0.7.
46 PET Plus User Manual
Advertisement
Table of Contents
