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Base formula KW JV46F KW Base formula Temp JV46F Temp

200 180 160 140 120 100 80 60 40 20 0

1

121

2

361

481

601

Rubber

½ Silica and

½ Silica and

Black and

Silane

Oil

Additives

When the process additive is put into the mix a significant change in mix torque and temperature is noted. The mix goes into a uniform mass almost immediately so there is faster work input . Even though the fill factor is the same the ram bottoms out during this portion of the mix. The lower viscosity causes a reduction in work input even though the shear rate has not changed. We have looked at the JV 46 addition with the silica and have better mixing and good property retentions. We have also looked at mixing times and in the lab mixer have seen the best properties at a 480sec mix time.

The mixing curve for the curatives is similar for both the 2+1 and the 1+1 and adds more work. Generally it is short and of low work input to keep curing reactions reduced.

Depending on the mixer size and type 4000-5000kg per hour per mixer can be produced in a tire factory. After each stage of mixing the mass is dropped from the mixer into a secondary process such as a dump extruder or two roll mill. This cools the stock and also prepares the stock for the next processing step. In our lab work the control mix was not easy to handle on the mill until after the inflection occurred at 6 minutes. The JV 46F stock milled easily and released from the mill even on the shortest mix.

STP0260

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