Rubber Field Info

Rubber Field Info

Moving Die Rheometer (MDR)

Moving Die Rheometers serve as the established testing technique for evaluating rubber curing across quality control and research and development domains.

Consequently, these rotor-free curemeters are outfitted with an enclosed, sealed, biconical die system compliant with pertinent ISO, ASTM, and DIN standards. Throughout the testing process, the lower die executes a sinusoidal oscillation with consistent amplitude and frequency, either at a steady (isothermal) temperature or a fluctuating (non-isothermal) temperature.

Testing Principle

The rubber test specimen is positioned within a substantially enclosed die cavity, maintained at the designated test temperature. This die cavity comprises both an upper and a lower die. The lower die executes a gentle linear back-and-forth motion (oscillation), inducing shear strain within the sample. The test piece’s reaction torque to the cavity’s action is gauged. The extent of this reaction torque is contingent upon the shear modulus of the rubber compound.

Importance of MDR

In the manufacturing of rubber goods, vulcanization is a crucial step. The rubber goes through a number of intricate chemical modifications during this process. In order to achieve more ideal physical and chemical qualities, the rubber transforms from a plastic compound to a highly elastic or hard cross-linked rubber, improving and expanding the use value and application range of rubber materials. As a result, vulcanization is crucial to the production and use of rubber and its products.

Under heating conditions, the raw rubber in the rubber compound chemically combines with the vulcanizing agent to transform the rubber from linear structure macromolecules into three-dimensional network structure macromolecules. This process is known as vulcanization. Vulcanization is the name given to this process. Under specific temperature, time, and pressure conditions, this crosslinking reaction is accomplished. These are referred to as vulcanization conditions. These vulcanization conditions are essential in the rubber business for creating compound formulations, comprehending rubber performance, and determining rubber quality. These requirements can be met by the MDR, which is also essential to the vulcanization process.

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