Table 2. Mixing Procedures

Time (min:s) rpm Action
1st stage 0:00 20 Add Rubber (NR/BR)
1:30 60 Add ½ (Carbon black + oil)
2:30 60 Add ½ (Carbon black + oil)
3:30 60 Add additives
5:30 60 Dump (dump temp.: 140-150°C)
2nd stage 0:00 20 CMB from 1st stage (initial temp.: 60°C)
0:30 40 Add curatives
2:30 40 Dump (dump temp.: 80-90°C)