Water Jet - New Technique for Pulpstone Surface Control, 1994 Pulping Conference Proceedings
S. Blomqvist, J. Valli, P. Reponen, R. Vahteri
Conditioning the pulpstone surface has been on of the major challenges in groundwood pulp manufacturing. Metallic burrs are used in sharpening. Controlling the penetration of the burr into the stone is difficult, and repeatability is even more problematic.
As a consequence, the freeness deviation of the pulp produced is often quite wide during a sharpening cycle. This limits pulp production because grinder power has to be reduced at the beginning of the sharpening cycle to avoid overly coarse pulp, and the output drops at the end of the cycle because of the dull stone.
To eliminate these disadvantages, Valmet-Tampella has developed a new stone conditioning system which is based on a high pressure water jet. In this system, the stone surface is sprayed with a water jet, and the efficiency of the treatment is controlled by adjusting the water pressure.
Water Jet - New Technique for Pulpstone Surface Control, 1994 Pulping Conference Proceedings