"We at Micro vision Enterprises are committed to
achieve customer satisfaction by manufacturing
consistent quality Rubber Testing Machines and providing
continually improved service after sale This is
achieved through adherence to ISO 9001 : 2000 quality policy and active participation of employees and associates.
Introduction Moving
Die Rheometer(MDR) is a testing equipment which
analysis the cure characteristics of
Rubber Compound & monitors the
processing characteristics as well as
physical properties of the material. It is
based upon international technology. It is
the only instrument in the rubber industry
which helps to choose right ingredients
and its appropriate dose to meet the end
products "MicroVision make"
Moving Die Rheometer is a Rotor less
Instrument in which Die oscillate and
measures the change in stiffness of rubber compound compressed between
two heated dies. The "MV" MDR
generates 3 curves S’, S" and Tan Delta.The MDR produces a cure curve labeled S’ which
is similar to the ODR curve.
Definition
of S’ and S"
S’
is called the storage modules ,elastic modulus
or in phase modulus. S" is called the loss
modulus, viscous modulus, or out-of-phase
modulus. All of these terms have been used to
mean the same thing. The unit of S’ and
S" in the product family instruments are in
lbs. These are units of torque. They can also be
in dnm. Which are also torque units.
Tan Delta
The
Tan(Delta) is computed from the ratio S"/S’
or loss of modulus divided by storage modulus.
The smaller the Tan delta, then the more viscous
the material.
Application
of S"
There
have been many research articles which discuss
the benefits of using S"(Loss modulus) or
Tan (Delta). A relationship may exists between
dynamic properties and processability (e.g. die
swell) of uncured compound. After cure, the loss
modulus can indicate whether a compound will
meet some special application. For example, the
rubber used in an automotive engine mount should
have high Tan(Delta). S" in order to dampen
vibration. On the other hand, the compound used
in a rubber band needs a low Tan Delta .
