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Hot Dispersion makes good economic sense and achieves a return upon investment in a comparatively short time in a modern stock preparation plant and is crucial when trying to meet todays demands for quality. The aim of dispersion is to distribute the contaminants in the waste paper to a non-visible size. With a vast number of installations now operating Hot Dispersion makes good economic sense and achieves a return upon investment in a comparatively short time. The HDS is the solution in order to optimise the performance flexibility and operating cost on varying degrees of both raw material and required results. It has a capacity to operate at temperatures up to 120C 248F. HDS produces the best dispersing result on all kinds of dispersible contaminants in waste paper. It is also the most flexible dispersing system. The discharge of the Screw Press KSR does not need to be pressurised as the downstream Plug Screw is designed to seal the system. Retention time through the system is 2 minutes time which enables all fibres as well as contaminants to be uniformly heated all the way through it is also enough for in-line bleaching and a high reduction of spores and bacteria in the pulp. DIRT AND SPECKS Due to the temperature the high consistency at plus 30 and the design of the HDS the dirt reduction efficiency will be very high. Normally it will be in the 85 to 95 range depending on raw material quality and previous treatment. The fibres and contaminants are heated to a point where they are soft and flexible. This will enable a stronger dispersion without the risk of excessive fibre shortening and freeness drops. The dispersion of dirt and specks is made possible due to the fibre-to-fibre friction as well as friction against the disperser plates. The HDS will ensure full and uniform heating of all fibres and contaminants this will in turn guarantee the efficiency. TACKY CONTAMINANTS The high temperature up to 120 deg. Celsius plays an even more important role in dispersion of tacky contaminants. On top of that high consistency at plus 30 and the design of the disperser makes the reduction efficiency of tacky contaminants outstanding. The contaminants are heated to a point where they are soft and can be dispersed over a large amount of fibre surfaces with fibre-to-fibre friction and friction against the disperser plates. WORLD PULPPAPER 17 Figure 2. Speck reduction before and after