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Quality Policy


"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.

ASHOK SHARMA
C.E.O




An ISO 9001:2000 Company

 

Frequently Asked Question's
 

Doubt's regarding authenticity can be arise about design of the Rheometer on being available indigenously, such point are required to be clarified for the above doubt's?


Q1.whether design of the machine is having standard norms?

Q2.Are there main feature's  as per the above standard?

Q3How do you compare "MV" OSCILLATING DISC RHEOMETER with brand Rheometer?

Q4.How "MV" ODR Rheometer is compared to the above mentioned unique feature











Q1.whether design of the machine is having standard norms?

Ans1. Yes, 180-3417:1991 (E) Rubber - Measurement of vulcanization characteristics with the Oscillating Disc Rheometer.

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Q2.Are there main feature's  as per the above standard?

Ans2.Disc & Dies: Made from non-deforming tool steel with minimum Rockwell hardness of 50 HAC. The geometry of the Disc & Dies is detailed in the standard.

a) Die Closure:  Dies shall be closed and held closed during the test by a pneumatic cylinder with a 
                       force of 11.0 +/- 0.5KN.

b) Disc Oscillation: Frequency 1.7 Hz +/- 0.1 Hz. Angular displacement 1.00. +/- 0.02 or 3.00 +/- 0.03 .

c) Torque measuring system:  A device which produces a signal i.e. directly proportional to the torque required to turn the disc shall be used to measure the torque on the disc.

d) Recording: The Recorder shall have a speed of response of full scale deflection on the torque
  scale of one second or less. The torque shall be recorded with an accuracy +/- 0.5% of
  the torque range. Three torque ranges of 0 to 2.SNM, 0 to SNM and 0 to 10NM, shall be provided.

e) Temperature measurement: 
The temperature measuring system shall enable the temperature of the die to be measured to within +/- 0.1C. The Dies shall be mounted in electrically heated aluminum platens. Temperature at steady state be within +/- 0.3C. On inserting test piece at 23C +/- 5C, the temperature recovery should suffice so that the temperature of the dies is +/- 1C of the set temperature within two minutes of the start of the test.

f) Torque measuring system:  Shall be calibrated by means of masses or by a standard torque system such as a calibrated torsion spring

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Q3.How do you compare "MV" OSCILLATING DISC RHEOMETER with brand Rheometer?

Ans3 TO ANSWER THIS QUESTION IT WILL BE BETTER IF WE LOOK AT THE HISTORY OF IMPROVEMENT IN THE ORIGINAL RHEOMETER WITH RESPECT TO CERTAIN SPECIAL FEATURES :

A. MECHANICAL :
1. Structural: In older models, the dies are open to the ambient atmosphere resulting 
       in poor temperature control and poor recovery of temperature. For this
       the dies in later design is housed in a Cabinet with shield controlling the
       access to the dies. This resulted in better temperature control and
       recovery during the test.

2. Main Bearing: In older models the bearing on which rotor oscillates is near to the
       heated region of the sample and also within the measuring system. In
       later models the bearing is located away from the heated region and is
       out of the measuring system. This resulted in less repair and maintenance
       required due to wearing of the bearing. It also resulted in decrease in
       frictional torque during testing.

3. Clamping of Rotor: In older models the Rotor is clamped mechanically by means of a draw
       bar system. In later models this has been replaced by a pneumatic cylinder
       thereby imparting consistent clamping pressure on the Rotor shaft.

4.Torque measurement: In older models a Torque arm strain gauge is used to measure force
       required for maximum displacement. This is replaced in later model by a
       Torque Transducer positioned immediately below the rotor. This resulted
       in direct torque measurement of the rotor. In older models the HALL
       effect switches is used to measure torque signal at maximum
       displacement only (2 readings per oscillation). Whereas in later model an
       Encoder system is used to read 16 points per oscillation thereby
       increasing the efficiency.

5. Temperature Control: In older models a separate solid state Thermister-sensing, time
       sequence proportional controller with integral cycle firing is used. This
       has been replaced in later model by Micro-processor and the control is
       under the Software. This has resulted in better accuracy of +/- 0.2.C
       compare to +/- 0.5 .C. The temperature recovery which was 4.5 to 6
       minutes to set temperature, in older models has improved to 50 to 60
       seconds in later models.
   
6. Recording: In older models recording is by means of flat bed strain gauge recorder.
       The record of torque against time is on a graph paper and by varying the
       X-Axis and Y-Axis, an appropriate graph is obtained. The results are
       manually calculated. In later model the data is collected by built-in
       micro-processor and the results are automatically computed at the end of
       tests and a print out is given out. There is capability of enhancing this
       with an additional software thereby one can do other statistical analysis
        of the data.

7. Result Variation: As per "Rubber World" 1990 January article " New Rheometer and
        Money Technology" by Patrik J. Di Mauro, Monsanto Company, and J. De
        Rudder and J.P. Etienne, Monsanto -Europe, one can appreciate that the
        results variation between original model and later models is quite
        substantial especially the time values. This is purely because of better
        temperature control and recovery. Tests conducted on a SBR compound
        at 177C. in 50 new machines of each type i.e. R1008, ODR 2000 and MDR
        2000, the difference can be summarized as follows:

7 a) Torque Values: ML is lower in ODR 2000 then R1008, MH is slightly higher in ODR 2000
        then R1008. ML & MH are much lower in MDR 2000 due to different design
        of the machine and the dies.

7 b) Time Values: Time values are faster in ODR 2000 against R100 and R1008. In MDR
        2000 it is much faster.                                                                             

 7 b) Sensitivity: The sensitivity of the machines with respect to variation in ingredient
        was also assessed and it was found that the difference between R 1008,
        ODR 2000 and MDR 2000 was insignificant. Any difference noticed was
        purely due to better temperature control and recovery.

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Q4.How "MV" ODR Rheometer is compared to the above mentioned unique feature

Ans4. 1. The Dies are enclosed in a Cabinet with shield for access to the dies. The shield is pneumatically operated.

2. The Main bearing is away from the heated region and out of the measuring system. Thereby reducing the frictional torque and increasing the sensitivity of the system. The repair and maintenance is like wise reduced.

3. The Clamping of the Rotor is by means of pneumatically operated cylinder thereby clamping it uniformly through out the test.

4. The Torque is measured by means of a Torque Transducer placed in line with the main shaft holding the rotor thereby measuring the torque accurately. The signal from the torque transducer is processed by the Computer to compute and record the value against time. This is displayed in real time on the monitor.

5. The temperature is controlled by two independent PID controllers with auto tune facility to provide with accurate and consistent temperature control throughout the test. The accuracy is : 0.3 to 0.5C. and temperature recovery to the set point is within 60 to 90 seconds.

6. The temperature and the torque signals are displayed and recorded by the computer and the result is automatically computed at the end of the test. There is built in customized software "MV-SOFTWARE" which also stores the data of each tests in the hard disk, the data can be retrieved individually or in compatible group for display in the form of multiple graph, the stored data can be statistically and graphically analyzed to bring out meaningful and result for assessing the quality, each result can be qualified by upper/lower limits thereby setting up a statistical quality control.

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