New way for processing packaging board for liquids

This presentation will highlight new innovations aimed at simplifying process solutions and eliminating the need for many traditional unit processes such as secondary pulper, coarse screening, HC cleaners and reject drums in recycled fiber lines. This leads to lower total investments, less energy consumption, less operating costs and reduced climate emissions together with higher fiber yield. 

Recycled paper contains various impurities which have to be removed from pulp. Hard and heavy particles cause wearing of the process equipment and the most economical way is to remove these impurities as early stage of process as possible. Light rejects like plastics tend to rotate above the vortex made by rotor and they have to be continuously removed. Traditionally there are several equipment needed to remove all these different rejects, but it can also be done in a simpler way.

Usually there are easily degradable material and material which is difficult to disintegrate in the recycled paper. It is known many cases where the disintegration time is too short for the material with higher wet strength and this material ends up in reject. New process innovation makes it possible to extend the disintegration time for the most difficult fibers including wet strength papers meanwhile the energy consumption can be kept lower than traditionally.

These new innovations presented at this paper are result of long-term research and engineering work. They make possible to improve efficiency of old pulpers and also building whole new pulping lines where coarse screening of pulp happens inside the pulper are possible.