METHOD AND APPARATUS FOR REMOVING PRINTING INK FROM SUSPENSION OF PRINTING WASTE PAPER PULP Russian patent published in 1997 - IPC

FIELD: paper waste disposal. SUBSTANCE: pulp is fed in the form of suspension into inlet opening of a shallow tank. Inner guide walls in this tank determine trajectory of flow from inlet to outlet opening. Size and arrangement of walls provide constant area of flow cross-section. Multitude of modules are disposed over the flow trajectory, each one including at least one injector to aerate flow and extractor to remove floating foam of printing ink. A part of flow from each module recycles into preceding module, preferably through pipe with pump. In preferable embodiment of invention, only injector (injectors) disposed next to inlet opening is fed from the following module and only extractor is disposed next to inlet opening. Flow velocity in main recycle circuit is higher than that between two modules. EFFECT: enhanced efficiency of process. 18 cl, 2 dwg