Rheograph 25 / 75 / 120 High Pressure Capillary Rheometers
Rheograph 25 / 75 / 120 High Pressure Capillary Rheometers
Rheograph 25 / 75 / 120 High Pressure Capillary Rheometers
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6<br />
<strong>Rheograph</strong><br />
Major options in more detail<br />
Shark Skin Analysis<br />
Flow-instabilities such as shark skin have<br />
long been observed, but difficult to measure.<br />
Common pressure or force transducers<br />
(typical 10 Hz max.) cannot pick up the slight<br />
pressure spikes caused by the instability.<br />
In cooperation with Professor M. Wilhelm<br />
(Institute of Applied Chemistry and Polymer<br />
Chemistry in Karlsruhe, Germany), a revolutionary<br />
sensory device was developed. Using<br />
a slit die and high frequency sensors with up<br />
to 20 kHz sampling rate, the smallest pressure<br />
peaks can be measured and analyzed. Results<br />
are evaluated in our special software and<br />
used to optimize extrusion, film and coating<br />
processes.<br />
<strong>Pressure</strong> [bar]<br />
185<br />
180<br />
1<strong>75</strong><br />
170<br />
165<br />
160<br />
0 5 10 15 20<br />
Time [s]<br />
Thermal<br />
Conductivity<br />
measurement<br />
PVT<br />
<strong>Pressure</strong>-Volume-<br />
Temperature<br />
measurement<br />
• Measurement of heat conductivity<br />
• Temperature range up to 450°C,<br />
pressure up to 1000 bar<br />
• Developed according to ASTM D5930<br />
• Test probe with integrated heater element<br />
and temperature sensor<br />
• No mechanical changeover required<br />
• Process simulation and optimization of<br />
injection molding cycle times<br />
• Measurement according to ISO 17744<br />
• Determination of characteristics<br />
<strong>Pressure</strong>, Volume and Temperature<br />
• Measurements isobar and isotherm<br />
• Presentation of a PVT diagram<br />
• Variable test sample volume<br />
• Easy handling with quick die locking system<br />
• Optimizing of the flow and shrinkage<br />
properties during production process<br />
VOLsp[mm³/g] Thermal conductivity [W/mK]<br />
0,3<br />
0,28<br />
0,26<br />
0,24<br />
0,22<br />
0,2<br />
1351,30<br />
1301,30<br />
1<strong>25</strong>1,30<br />
0 [bar]<br />
100 [bar]<br />
200 [bar]<br />
500 [bar]<br />
900 [bar]<br />
90 110 130 150 170 190 210 230<br />
Temperature [°C]<br />
P [bar]<br />
200<br />
400<br />
600<br />
800<br />
1000<br />
<strong>120</strong>1,30<br />
1151,30<br />
1101,30<br />
1051,30<br />
20,00 70,00 <strong>120</strong>,00 170,00 220,00 270,00<br />
T[°C]
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