Science of mill processability

A high speed tensile tester was used to match the deformation rates in the internal mixer. 

Reprinted with permission from N. Nakajima, E. A. Collins and H. H. Bowerman, Rubber Chemistry and Technology, 1974, 47, 2, 318. Copyright 1974, Rubber Division of the ACS. 

The stress, o, based on the undeformed cross-section is converted to that based on the deformed cross-section with a use of the extension ratio, a. The value plotted in the figure, o is therefore the true stress. 

Reprinted with permission from N. Nakajima, Polymer Engineering Science, 1979, 19, 3, 215. Copyright 1979, Society of Plastic Engineers. 

Because the mill behaviour and the resnlts of the tensile test are shown to be related, the tensile test results may be used for the characterisation of processability for a given rubber. This aspect will be expanded in Chapter 6. 

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