METHOD OF SEPARATING BARK FROM CHIPS AND THEIR DRYING Russian patent published in 2010 - IPC F26B3/00 

FIELD: heating system, drying.

SUBSTANCE: invention refers to woodworking industry and can be used during production of composite materials, wood flour, biofuel both of bulk and granular type (pellets, granules, timber or bark bricks). Method of separating the bark from chips and their drying, which involves chips storehouse, manipulators with grab buckets, petrolatum and water capacities, separator, pumps, fans, pipelines, electric motors, swivel plates, cylinders, hydraulic motors. The method is differed by the fact that loading manipulator with grab bucket grabs the chips which are not separated from bark from the pile, and not opening bucket grab jaws, it lowers chips with bark down to boiling petrolatum, where the portion of chips is kept in bucket grab for not more than 2 minutes, and then it moves bucket grab with chips to the outside and keep it above capacity with petrolatum, bark and chips are dried; at that, drying process of bark takes more time than timber, bark is separated from chips, and chips and bark from which petrolatum is evaporated become dry, and loading manipulator with bucket grab is stopped above capacity with water rotating in it, and bucket grab opens jaws, chips and bark are emptied to water capacity; at that, bark, being lighter, is accumulated at the top of the capacity, and chips are in lower layer; then, loading manipulator with bucket grab takes upper bark from water capacity and transfers it to separator, where it is finally separated from chips and supplied with the pump from the swivel plate of separator to bark pipeline, and then the same loading manipulator takes by means of bucket grab the lower layer in water capacity and transfers chips separated from bark to separator, where chips are taken with pump to its pipeline; during separation of bark from chips and their drying there provided is keeping of chips with bark in boiling petrolatum for not more than 2 minutes and keeping above petrolatum capacity for not more than 5 minutes; at that, petrolatum temperature is 125-140°C, water rotation speed is not less than 3 m/s, final humidity of chips is 8-12%, bark is 4-6%.

EFFECT: implementation of the proposed method of separating bark from chips will allow processing unpeeled timber, paper wood, fire wood, branch timber, fencing wood, slabwood, half-timber for chips, and then separating bark from timber and drying them, and goods are produced from dried chips and bark.

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