MonTech MDR 3000
System Description

The rubber testing system consists of the moving die rheometer, a PC with screen, keyboard and mouse as well as a printer.

The test chamber is equipped with a pneumatic closing device, with a closing force of 11.6 kN equipped. The opening of the test chamber is at any time possible. Between measurements, the test chamber can be manually closed in standby mode.

To protect the user a safety shield is lowered before the test chamber is closed. Between tests the test chamber can manually be closed in a standby mode. A delay time for opening the safety shield can freely be configured in the software. Furthermore there is the possibility of the attachment of a suction for produced waste gas to the back of the instrument.

The temperature of the two test chamber halves are independently measured by means of PT 100 RTDs and heating is controlled via software.

The rubber mixture sample is tested under torsion generated by rotational vibration of the lower test chamber. The lower test chamber generates sinusoidal rotational vibrations with fixed-angle amplitude. The oscillation amplitude is programmable from 0.1° to 5°. The torque is measured via a strain gauge torque transducer with very high resolution.

Due to the rugged construction of the MDR 3000, it can be used for quality control purposes not only in the laboratory, but also directly in the production area.

The data acquisition and the control of the testing instrument is made by the PC by means of the included 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 the test results from the viscous and elastic portions of the mixture.

Test chamber system

The two test chamber halves form a closed, biconical system. That means the test chamber is formed by two conical test dies. This ensures a constant shear rate which is independent of the die radius in the sample.

The test chamber is equipped with a pneumatic closing system, which moves the upper test chamber half to the lower test chamber half to completely close the test chamber and keep the test sample during the test or cure under pressure. The default closing force is 11,6 kN at 4,5 bar air pressure.

During the test the lower die performs a sinusoidal movement with a variable amplitude and a fi xed frequency. This movement is generated by a high precision torque motor system with integrated ceramic bearing and precision-path-recording which is mounted directly at the shaft of the lower die. This motor is regulated by a corresponding high-resolution motor controller - this controller is freely programmable by the MonControl Analyses Software. Because of an integrated overload protection the drive will be switched of and the current test will be stopped if the maximum permitted torque is exceeded.

The measurement of the reaction torque is made by a DMS torque transducer with a very high resolution which is directly mounted above the upper test die. With this transducer it is also possible to measure the current pressure in the test chamber (optional).

The temperature control of both electrically heated test dies is made by the MonControl Analysis Software with a separate control system for each test die.

The temperature control and temperature measurement is performed by PT 100 resistance thermometers. For the heating of both test dies a heating film is used - one film for each test die. The heating film has a spiral shape with different distances between the windings. Therefore a heat concentration is prevented and a uniform temperature spreading is ensured.

Moving Die Rheometer Volume Punch

For the exact production of test samples for the MDR 3000, the R-VS 3000 sample cutter for moving die rheometers 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.

MonTech MDR 3000
Testing Capabilities

Torque	Elastic modulus S‘ Viscous Modulus S‘‘	Vulcanization speed
Scorch-times	Normal force measurement P (optional)

Determinable Results

Elastic Torque The peak amplitude torque component which is in phase with a sinusoidally applied strain.	Viscous Torque The peak amplitude torque which is 90° out of phase with a sinusoidally applied strain.
Complex Torque The peak amplitude torque response measured by a reaction torque transducer for a sinusoidally applied strain.	Tan-Delta The ratio of loss modulus to storage modulus, or the ratio of viscous torque to elastic torque.
vulcanization-speed First derivation of the elastic torque S‘	Pressure The axial load exerted on the die during the test.

MonTech MDR 3000
Specifications

International standards	ISO 6502 / ASTM D 5289 / DIN 53529
Test chamber	Biconical, closed System
Oscillation frequency	1.667 Hz
Oscillation amplitude	Programmable via Software, 0.1° to 5°
Temperature control system	30 °C to 240 °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) Temperature (°C, °F) Pressure (bar, kg per cm²) Time (min - min / min - sec) Shear rate (1/s, rad/s)
Pneumatics	min. 5 Bar
Electrical	Single phase 220 V - 230 V, 5 Amps
Weight	130 Kg
Connection for dust / vapor extraction	100mm dia
Dimensions