Haake Rotovisco1 - Thermo Scientific HAAKE RotoVisco 1 Instruction Manual

Unit Description

7.1 HAAKE RotoVisco1

Thixotropy and flow curve
The determination of the flow behavior of a test substance
requires a speed ramp up, a holding time and a return curve
for the determination of the thixotropy. This hysteresis
method can like all other measuring procedures be PC con-
trolled or can be loaded as procedure in the display and con-
trol unit.
Time curve
Is the viscosity of a test substance changing with time this
can be monitored objectively with the HAAKE RotoVisco1.
This is especially important for substances which are curing
(adhesives, building materials), change their viscosity with
storage time or show considerable changes of viscosity after
shearing during the production process (cosmetics, paint,
food).
Temperature programs
Temperature programs are very time consuming when the
rheometer has to be operated and supervised. With the Ro-
toVisco1 these tasks can be taken over by the PC which con-
trols the rheometer as well as the temperature control units
-- everything without intervention of the operator.
Determination of the yield point
As soon as substances are strained beyond the Hookean
range they start to flow. This can be defined as yield point
and is an important characteristic value in quality control.
With the HAAKE RotoVisco1 this value can be established
relevant to practical applications, fast and easily by applying
a small deformation through extremely low speed values.
CD Mode
In the CD mode (speeds lower than 0.1 min
sured at constant speeds. When ramps or steps are preset,
the following speed table is run:
–1
Speed ( min
0.0125
0.0250
0.0375
0.0500
0.0630
0.0750
0.0875
0.1000
17
)
–1
) it is only mea-