D-RPA 3000

D-RPA 3000

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INSTRUMENT DESCRIPTION


D-RPA 3000

Oscillation strain

+/- 0.0001° to 360°

Advanced Dynamic Moving Die Rheometer

The D-RPA 3000 is designed for measuring the viscoelastic properties of polymers and elastomeric compounds before, during and after cure. The acquired data gives exact information about the processability, cure characteristics, cure speed, and behavior of the compound at the after-cure.

The D-RPA 3000 fulfills the complete range of all test requirements; Polymers, raw materials, basic, finished and cured compounds can all be characterized. Besides the cure properties, cure characteristics and processability can all be determined and evaluated.

The D-RPA 3000 is the state-of-the-art machine for dynamic testing purposes. The machine can be fitted with several unique options such as variable die gap, low-temperature cooling, and high speed data acquisition – providing the highest frequency-strain combination available on the market.

The high flexibility of the D-RPA 3000 allows the user to program and execute arbitrary test sequences with the MonControl Analyses Software. Each dynamic test sequence can include an unlimited number of the following substeps: timed tests, isothermal tests, non-isothermal tests, amplitude sweeps, frequency sweeps, temperature sweeps, shear rate sweeps, relaxations, retardations, hysteresis and tension tests. Of course, any combination of these sub-tests are possible – with or without an initial strain, as well as strain or stress controlled.

Equipped with single test – multi subtest test procedure programming with up to 1000 sub-programs as well as an unbeaten shear rate range of up to 100 sec-1 – the D-RPA 3000 is truly the most flexible and dynamic multi function Rheometer in the market.

Completely closed, directly heated, biconical test chamber system

entirely made of high-strength stainless steel, precision ground and hardened, significantly reducing sample slippage for highest dynamic test ranges and most accurate torque, modulus and viscosity readings.

Automation options

All MonTech Moving Die Rheometers as well as Rubber Process Analyzers can be easily automated, allowing customers to increase productivity and release operators for other important tasks.

MonTech offers the worlds largest Rheometer Automation portfolio designed for our customers to rely on – in the lab or on the shopfloor, in multiple shifts, 365 days, every year. Depending on the selected type of automation system, samples are loaded and unloaded automatically from linear or rotary trays, film is fed and tested samples are removed automatically.

Of course, every automated machine can – within a single click – also be switched into manual operation mode.

Instrument options

For specific testing requirements MonTech offers a variety of instrument options to customize a testing solution exactly for your specific requirements:

– Forced air and low-temperature cooling systems

– Axial force transducers

– Cavity pressure control systems

– High speed data acquisition systems

– Data, IT and software integration

– Advanced productivity options


APPLICATIONS


Isothermal Cure

Isothermal cure experiments are the most common type of test for quality control in rubber and elastomer processing. MonTech Moving Die Rheometers provide high precision data as well as a simple operation of the instruments. All the important characteristics, such as minimum / maximum elastic torque, scorch times, cure times and reaction rates are precisely calculated, with over 3500 different datapoints. All data is available in numerical as well as graphical form; limits, control gates and tolerance graphs can easily be set, and Pass / Fail status is automatically evaluated after each test.

Non-isothermal Cure

In addition to isothermal static cure testing, MonTech MDRs and RPAs can perform tests at variable temperatures. These non-isothermal sequences can be programmed in order to follow virtually any temperature profile, making them especially valuable for the simulation of manufacturing processes which are usually not isothermal. Typical processes that can be simulated are mixing, milling, extrusion, compression moulding, injection moulding, and storage conditions. Of course, non-isothermal test sequences can be executed in a single test with any other static or dynamic sequence, such as strain and frequency sweeps, providing the most accurate data of the material‘s behavior at any production stage and material state.

Strain Sweep for Filler Loading "Payne-effect"

The Payne effect is a particular feature of the stress-strain behavior of rubber, especially rubber compounds containing fillers such as carbon black and silica. Physically, the Payne effect can be attributed to deformation-induced changes in the material‘s microstructure, i.e. to breakage and recovery of weak physical bonds linking adjacent filler clusters. Measurement of modulus vs. strain is therefore essential to understanding and quantifying filler loading, filler dispersion and filler-filler interaction in the low strain region, and polymer-filler interaction at higher strain. The resulting characterizations of material structure are essential as they directly impact dynamic stiffness and damping behavior of final products such as rubber bushings, automotive tyres and all other rubber goods. Similar to the Payne effect under small deformations is the Mullins effect, which is observed under larger deformations in the non-linear viscoelastic range.

Frequency sweep material analysis

In general, the mechanical properties of materials depend on frequency. A good understanding of the influence of frequency on a material is therefore very important for its practical use. For example, a material appears stiff under the action of a force at high frequency, but soft when the force is applied slowly. Isothermal frequency sweeps provide information about the weight distribution MWD (crossover modulus) as well as average molecular weight AWM (crossover frequency). But the behavior of viscoelastic materials like polymers not only depends on frequency, it also depends on temperature.

MonTech has incorporated further advanced testing capabilities such as the Time- Temperature Superposition principle (TTS), which is based on the equivalence between frequency and temperature behavior during transition processes, forming the basis of WLF master-curve modelling available on MonTech dynamic Rheometers, even for predicting material performance at frequencies outside the range that can be measured with a dynamic mechanical analyzer.


TECHNICAL SPECIFICATION


International standards

ISO 13145, ISO 6502, ASTM D 5289, ASTM D 6204, ASTM D 6601, ASTM D 6048, ASTM D 7050, ASTM D 7605, DIN 53529

Die configuration

Biconical, closed die system, sealed

Drive system

Advanced wearless servo drive system with ceramic bearings

Oscillation frequency

0.001 Hz to 100 Hz (0.05 to 6000 cpm)

Oscillation strain

+/- 0.001° to 360° (+/- 0.14% to 5000%)

Temperature range

Ambient to 232 °C

Measured Data

Torque, temperature, frequency, strain; Optional: Normal force, die gap, die pressure

Calculated Data

S΄, S˝, S*, G΄, G˝, G*, tan δ, phase angle, cure speed, η΄, η˝, η*, ...

Die gap

0.45 mm nominal, variable die gap and closing force optional

Sample volume

approx. 4.5 cm³

Closing system

Soft closing to prevent foil rips and damage of test samples, optionally variable closing force and die gap

Torque range

0.0001 to 235 dNm

Temperature check system

Recordings of the temperature gradient on the screen, microprocessor monitored

Subroutines

Isothermal, Non-Isothermal, Timed, Temperature Sweep, Strain Sweep, Frequency Sweep, Shear rate Sweep, Relaxation, Retardation, Hysteresis, Tension tests, LAOS, ...

Data Interface

Ethernet (10/100 MBit), USB (int.), CF card (int.), RS232 (opt.)

Data points

Over 3500 data points available for each static subtest Including S‘ Min, S‘ Max, TS 1, TS 2, TC 10, TC 30, TC

50, TC 90 Integrated, automatic reporting features for dynamic tests

Pneumatics

min. 4.5 Bar / 60 psi

Electrical

200 V - 240 V, 6 Amps, 50/60 Hz

Instrument options

- Instrument control panel with 5“ touchscreen display and printer - Torque transducer for low-viscosity torque range - Normal force / Pressure measurement - Cavity pressure control system - High speed data acquisition - Low-temperature cooling system MCool 10 / MCool -40 - Autoloader 5 or 10 sample linear - Autoloader with 24, 48 or 100 sample tray or tray changers - R-VS 3000 constant volume sample cutter

CALCULATED RESULTS

PARAMETER

Completely closed, directly heated, biconical test chamber system

Tray changer system for up to 240 or 480 samples

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