6. The choice of UHP water jetting.
There are 2 options:
- High water pressure, about 2.000 bar.
- Ultra-High waterpressure, about 4.000 bar.
One can understand that the higher the water pressure, the greater will be the penetration into the rubber.
BTRC has chosen the 2nd option with some 4.200 bar which is getting a 4 to 6cm penetration into the rubber and provides the best performance (yield) for big tyres.
On small car tires, there the 1st option @ 2.000 bar which is sufficient for pulverizing the thin layer of rubber in the tread.
The 2nd option @ 4.200 bar provides directly powder <400µm with a specific morphology having a surface-de-vulcanised powder of reclaim quality.
It gives directly (surface) de-vulcanised rubber.
Of course the latter has a significant positive effect on the sales price and thus on the higher yield of this “pulverizing” operation.
