A METHOD AND EQUIPMENT FOR MANUFACTURING PREDETERMINED LOW BARK CONTENT WOOD CHIPS AND A HIGH BARK CONTENT FUEL FRACTION FROM WOOD CHIPS WITH BARK ATTACHED

摘要

The object of the invention is a method and equipment manufacturing predetermined low bark content wood chips and a high bark content fuel fraction from wood chips with bark attached, which method includes the following stages: mechanical bark removal treatment (7), in which the bark is removed from the chips and their size is reduced; and pre-cleaning (6, 9, 11) of the flow of chips with bark attached; and final cleaning of the aforesaid wood chip flow from the pre-cleaning, with the aid of an optical separator (10). Before the mechanical bark removal process (7) a thin fraction of the chips is sieved out of the flow of wood chips, and then bypasses the mechanical process (7), which improves the yield and the piece size distribution.