Twin roll method

The tan 6 measured by our Instrumented Yerzley Oscillograph (abbreviated as lYO) has adequate precision, and was found to correlate reasonably well with tan 6 measured on rubber samples by the MTS equipment at 40 Hz and 60 C. It also correlates remarkably well with rolling resistance of tires (Figure 11) as determined by the "Twin Roll Method" and used for evaluation and testing of tires. 

The rapid solidification methods such as the single-roU method, twin-roll method and atomization method were adopted by the patent (CN1099353A), in which the cooling rate is more than 100 K s for the rapid solidification. That is, both structure of crystal and sm-face of iron oxide are changed, and the crystallite size in a-Fe phase decreases while the amount of high active crystal face increases. Quenching... 

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