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작성일 : 16-03-28 14:55
[Rheometers / RPA] MDR 3000 Professional
 
 글쓴이 : 코린스테크
조회 : 714  
MDR 3000 Professional
Rheometer / Rubber Process Analyzer

Moving die rheometer for rubber compound testing with variable oscillation amplitude from ±0.01—20° (±0.14—280% Strain) and variable oscillation frequency from 0.001 Hz to 33 Hz

The MDR 3000 Professional rheometer is designed for measuring the viscoelastic properties of elastomeric and rubber compounds before, during and after cure according to: ISO 6502 / ASTM D 5289 / ASTM D 6204 / ASTM D 6601 / DIN 53529

The MDR 3000 Professional rheometer fulfills the complete range of all test requirements: Polymer or raw materials as well as basic, finished and cured compounds can be characterized. The cure characteristics and the processability can be determined and evaluated too.

The high flexibility of the MDR 3000 Professional rheometer allows the user to program and execute arbitrary test sequences with the MonControl Analyses Software. Isothermal tests, non-isothermal tests, amplitude sweeps, frequency sweeps, temperature sweeps, shear rate sweeps, relaxations, retardations, hysteresis and tensile tests can be defined, as well as a combination of test sequences.

MDR 3000 Professional Rheometer System
MDR 3000 Professional
System Description

The testing instrument consists of the rheometer, computer with MonControl analysis software, wide-screen monitor, keyboard, mouse, and printer.

Because of the very high measuring precision of the MDR 3000 Professional, small variations of ingredients can be detected in the test result data, which simplifies quality control and the development of new rubber compounds.

Due to its rugged construction, the MDR 3000 Professional can be used for quality control purposes in the laboratory and directly in the production area.

Important Advantages

  • Lower costs per test
  • Faster batch release - with only one test, all essential physical characteristics can be determined: (quality control data, cure characteristics and properties)
  • Significant reduction of scrap and rework
  • Efficiency increase of the production process
  • Faster and significantly simplified development cycles
  • Intuitive, simple operation of the MonControl Analysis Software
  • No separate sample preparation necessary

Lower die of a moving die rheometerDescription of Operation

The test chamber is equipped with a pneumatic closing system which moves the upper test chamber half to the lower test chamber half. The two test chamber halves form a closed, bi-conical system. This ensures a constant shear rate which is independent of the die radius in the sample.

The default closing force is 11.6 kN at 4.5 bar air pressure. This completely closes the test chamber and keeps the test sample under pressure during the test / cure. The opening of the test chamber is possible at any time.

To protect the user a safety shield is lowered before the test chamber is closed. Between tests the chamber can manually be closed in a standby mode. A delay time for opening the safety shield can be configured in the software. Furthermore there is a port on the back of the rheometer for suction of waste gas produced during testing.

Temperature control of both electrically heated test dies is made by the MonControl Analysis Software with a separate control system for each test die. Temperature measurement is performed by PT 100 resistance thermometers. Both dies are heated by a heating film with spiral windings. This design ensures temperature uniformity throughout the dies. Both chambers are cooled separately by a PID-controlled forced air cooling system. The cooling system can be programmed in the test definition to cool the dies and compound during test sequences

The rubber mixture sample is tested under sinusoidal torsion generated by the lower test chamber during the test. The MDR 3000 Professional can vary oscillation amplitude from ±0.01° to 20° and frequency from 0.001 Hz to 33 Hz. This movement is generated by a high precision torque motor system with integrated ceramic bearings and precision path recording. The motor is mounted directly to the shaft of the lower die. The motor is software controlled and regulated by a corresponding high-resolution motor controller with overload protection.

Diagram of moving die rheometer testThe reaction torque is measured by a high-resolution strain gauge transducer mounted above the upper test die.

Control and data acquisition is performed via the connected computer using MonControl analysis software. For the storage and analysis of the determined measurement data a modern SQL database structure is provided. Over 1,500 time and torque characteristics are available for the selection of test results from the viscous and elastic portions of the mixture.


MDR 3000 Professional
Testing Capabilities


For the best possible determination of all relevant test parameters the MDR 3000 Professional is equipped with a large variety of test methods, test parameters as well as calculation and evaluation options.

torque graph elastic / viscous modulus graph vulcanization speed graph
Torque Elastic modulus S‘
Viscous Modulus S‘‘
Vulcanization speed
scorch time graph normal force graph  
Scorch-times Normal force measurement P (optional)  

Determinable Results

The following measurands can be determined:

  • Shear modulus G’ and G’’
  • Complex shear modulus G*
  • Torque S’ and S’
  • Complex torque S*
  • Dynamic real viscosity n‘
  • Dynamic imaginary viscosity n‘‘
  • Dynamic complex viscosity n*
  • Loss angle d
  • Tangent-delta
  • Pressure (optional)
  • Modulus under extension/compression E*, E’, E’’
  • Compliance under extension/compression D*, D’, D’’
  • Spring rate Ks, Kc, Kp
  • Damping coefficient C

Oscillation as a function of the frequency
Oscillation as a function of the frequency graphs

Modulation with a constant speed amplitude
Modulation with a constant speed amplitude graphs

Modulation with a superimposed shear
Modulation with a superimposed shear graphs

Further derived measurements

  • Compliance
  • Modulus under extension/compression
  • Compliance under extension/compression

MDR 3000
MonControl Analysis Software


MonControl Analysis Software: Isotherm test
MonControl Analysis Software: Relaxation with preheated test sample
MonControl Analysis Software: Amplitude sweep

MonControl Analysis Software enables the user to configure, combine and execute the respective tests. After inserting the test sample, the actual test sequence is executed fully automatic without any intervention of the operator. The D-MDR 3000 in combination with the MonControl Analysis Software offers a huge variety of test parameters, which makes it possible to determine a wide range of properties in rheometry.

The following test parameters are freely definable:

  • Temperature
  • Oscillation frequency
  • Oscillation amplitude
  • Time
  • Sampling rate
  • Number of measuring cycles
  • Pressure (optional)
  • Die gap (optional)

The following test programs are available with the MDR 3000:

  • Amplitude sweep
    The deflection angle (Amplitude) is changed during test at a predefined frequency and temperature.

  • Frequency sweep
    The frequency of the oscillation is changed during test at a predefined amplitude and temperature.

  • Temperature sweep
    The temperature of the test chamber is changed during test at a predefined amplitude and frequency.

  • Shear rate sweep
    Changing of the shear rate during the examination. The shear rate sweep represents a sequence of different retardation cycles.

  • Relaxation
    Describes the unstressing after a strain. Stable physical systems return to an outer perturbation over relaxation processes nearly into their ground state. The relaxation time is a time constant which is characteristic for the given relaxation process. If the quantity f(t) of the relaxations follows an exponential rule: f(t) = exp( - t / t) * f(t = 0) then t is the accompanying relaxation time.

  • Retardation
    Examination of the fatigue behavior of a material under a constant load. Besides the elastic deformation the material experiences a time-dependent reversible (viscoelastic) and an irreversible (plastic) deformation. At the transition to the plastic condition the tension remains constant in the material. The force-time graph describes an e-function. If the stress is too high it comes time-dependently to a break of the material.

  • Hysteresis
    The change of the viscosity under influence of one constant shear gradient, depending on the duration of the influence. With increasing duration of the influence by the shear force the hysteresis effect is increasingly irreversible.

  • Tensile tests
    A material identification value which indicates the lasting prolongation of the
    break related to the initial measuring length.

  • many more test programs

MDR 3000 Professional
Optional Equipment


Pressure measurement
Features a combined torque / forced transducer to measure torques as well as the pressure within the test chamber. Before each test, the transducer and amplifier is balanced automatically. The system also includes a second channel amplifier system for real-time simultaneous measurements of torque and normal force.

Pressure Control
With this option, that cavity pressure can also be controlled either to a pre-programmed or to an on-line calculated pressure level. Therefore the closing force as well as the die gap are designed as a variable, independent axis, so that the cavity pressure can be precisely controlled. This system is especially suitable for test sequences that include curing as well as a cool-down of the sample for a dynamical mechanical analyses. Therefore the system can be utilized to compensate material shrinkage as well as to avoid any slippage in the test chamber. This technology is worldwide patented by MonTech.

Pneumatic Cooling System
This system uses pressurized air to cool both chambers separately using a PID-controlled forced air cooling system. In MDR mode this system can be used to rapidly cool the rheometer from a higher to lower testing temperature. This significantly reduces non-productive time of the instrument, shortens stabilization time, and operator waiting time. Non-Isothermal and RPA operation modes can be programmed in the test definition to cool the sample during test sequences and follow precise cooling ramps or steps as well as conduct any friction heat from the sample during a test with high shear rates.

High speed data acquisition system
The high speed DAQ option offer unique result stream resolution as well as an ultimate level of precision for torque as well as the motor position signal. Therefore both channels are sampled and processed simultaneously with a resolution of 24Bit at a data rate of 180KHz. All data streams are provided on the PC and calculated on-line in a Real-time kernel. Also it is possible to save the raw data streams to the PC memory. This makes the system especially suitable for FT-Rheology purposes.

R-VS 3000 Rheometer Volume PunchRheometer volume punch
For the exact production of test samples for rheometers, the R-VS 3000 sample cutter is an available option. This volume punch is used for rapid and accurate preparation of test specimens. The usage of a volume cutter is recommended because this ensures reliable and reproducible test results.

MDR 3000 Professional
Specifications


International standards ISO 6502 / ASTM D 5289 / ASTM D 6204 / ASTM D 6601 / DIN 53529
Test chamber Bi-conical, closed System
Test chamber gap 0,45 mm nominal
Force measurement Torque transducer mounted at the upper test chamber
Closing system Soft closing to prevent foil rips and damage of test samples
Oscillation frequency 0.001 Hz - 33 Hz
Oscillation amplitude

Variable, ±0.01—20° (±0.14—280%)

Temperature control system 30°C to 232°C, precision +/- 0.03°C both microprocessor controlled
Temperature check system Recordings of the temperature gradient on the screen, microprocessor monitored
Units of measure Torque (dNm, lbf•in, kgf•cm)
Shear modulus (Pa, dynes/cm², psi)
Dynamic viscosity (Pa s)
Temperature (°C, °F)
Pressure (bar, kg per cm²)
Time (min - min / min - sec)
Frequency (Hz, cpm)
Shear rate (1/s, rad/s)
Pneumatics min. 4.5 Bar
Electrical Single phase 220 V - 230 V, 5 Amps
Weight 230 kg
Connection for dust / vapor extraction 100mm dia
Dimensions






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