What is the difference between ODR and MDR rheometer?
There are two types of rheometers in the rubber industry, ODR (oscillating disc rheometer) and MDR (moving die rheometer), but their purpose and role are the same. We insert a piece of raw unvulcanized rubber into the cavity of the rheometer and close the rheometer.
What is MDR in rubber?
An MDR, or Moving Die Rheometer, is apparatus for testing the viscoelastic properties of rubber compounds before, during and after cure. This machine provides information on the curing behaviour of rubber materials.
What is ts1 rheometer?
ts1, ts2 (induction time). After reaching the minimum torque, during the curing phase the torque is increased, ts1 or ts2 is the abrasion time for the viscosity to increase 1 or 2 units above ML. • ts5 (scorch or burn time). It is the time for the viscosity (torque) to increase 5 units above the ML.
What does MDR measure?
The RPA and MDR instruments perform oscillation, or dynamic measurements of polymer and rubber properties. These tests provide basic torque information, as well as viscoelastic properties such as the storage and loss modulus, tan δ, and viscosity.
What is ODR machine?
This machine is designed to get the characteristic curve and characteristic parameters of rubber vulcanization by measuring the applied moment of rubber to the oscillating dye body.
What is Mooney Scorch?
The Mooney scorch test is performed to determine the scorch time of rubber compounds. In the scorch test, viscosity decreases before increasing as vulcanization progresses.
What is optimum cure time?
Optimum cure time (t90), which as stated earlier, is the. time required for the torque to reach 90% of the maximum. achievable torque (T90) and relates to the time necessary for the. cured rubber to achieve optimal properties.7 The last stage can. involve overcuring reactions depending on the rubber type, vul-
What is ML rheometer?
ML: Minimum Torque. This calculation returns the minimum torque value measured during the test; The calculation provides useful information regarding the viscosity of the green compound at test temperature.
What is ML and MH in rheometer?
The minimum torque (ML) is a measure of the extent of mastication, whereas the maximum torque (MH) is an indication of the cross-linking density of the fully vulcanized rubber.
What is the use of rheometer?
Rheometers are used to analyse the complex flow characteristics of materials by subjecting a sample to various types of stress, such as shear stress and deformation.
Is ADR same as ODR?
ODR and ADR are fundamentally the same thing. Doctors practice medicine. When they introduce technology into their work, they do not consider that a new field – it is still medicine.
What is rubber scorch?
Scorch is premature vulcanization in which the rubber compound be- comes partly vulcanized before the product is in its final form and ready. for vulcanization.’ It reduces the plastic properties of the compound so that. it can no longer be processed.
What are rotorless die rheometers?
Moving Die Rheometers are the standard testing method for characterisation of rubber curing in quality control as well as research and development. Therefore these rotorless curemeters are equipped with a closed, sealed, biconical die system according to all relevant ISO, ASTM and DIN standards.
What is the MDR 3000 rubber moving die rheometer?
The MDR 3000 rubber moving die rheometer features the tough 3000 series frame made of stainless steel and aerospace grade aluminum. The software programmable MDR motor drive system allows the oscillation strain to be preset from 0.01 to 5.0° while achieving unmatched accuracy and repeatability.
How does the Montech rheometer work?
Every MonTech Rheometer is equipped with a pneumatic die closing system for a reliable closing and sealing of the die cavity. Optionally, instruments can be equipped with variable closing force, cavity pressure and variable die gap control.
What is the effect of low viscosity on die pressure on rubber?
A low viscosity will mean than rubber will easily flow through the extruder with low die pressure.Once the rubber is extruded it is required to be in the correct size – however as the rubber is extruded through the die it is in compression across the direction of flow and extension in the direction of flow.