Step

Operation

Duration

(min)

1

Heating the cylinders surface to 70˚C

1

2

Plasticization of the natural rubber

1

3

Incorporation of the crumb (after spacing the cylinders)

2

4

Incorporation of the activators: ZnO + Stearic acid

1

5

Incorporation of the accelerators: TMTD

1

6

Incorporation of the Carbon blacks: N330

1

7

Incorporation of the antioxydant: Vulkacit H/30

1

8

Incorporation of the sulfur (after reducing the cylinder gap)

2

9

Drawing of the raw sample in slabs

2