One reason for this is high demands of reliability of used components. On the other hand there can be seen many reasons for use of water hydraulics in the paper machine environment. Most of the piping are all ready made of stainless steels and there are large amount of different kind of waters available in the paper machine environment. Water jet cutting can be used from paper to metal, for example cutting the turbine vane made from titan. Water jet cutting can be divided roughly to normal and abrasive cutting.
Normal cutting means cutting with pure tap water.
In abrasive cutting small hard particles are added to water. When the water jet is pointed to cut material it develops surface pressure which is bigger than crushing strength of the cut material. Surface of the material is crushed and water penetrates to hair crack and transfers disengaged parts away. Properties of cutting can be affected by changing the water pressure, diameter of the orifice, cutting distance and speed of cutting. The shape of the cutting jet stream is also very important.