| 摘要 |
A method and an apparatus for removing impurities from plant fibrous material which constitutes residual products in the refining of tuber or root vegetables, fruits etc. are described. The TS content of the plant fibrous material is adjusted for forming a first substance (21), whereafter the first substance, by means of a first screening means (51) is fractionated to form a first fraction (31). The TS content of the first fraction (31) is reduced, for the formation of a first mass (11), and the mass (11) is dried, for the formation of a second substance (22). This is fractionated in a second screening means (52) to form a second fraction (32) which substantially exclusively consists of plant fibres. An apparatus according to the invention comprises first means (41) for adjustment of the moisture content of supplied material, a first screening means (51) for the formation of a first fraction (31), a moistening device (60) which forms from the first fraction (31) a first mass (11), drying means (42) reducing the moisture content of the first mass (11) and forming a second substance (22), and a second screening means (52) which receives said substance and separates therefrom a second fraction (32) which substantially consists exclusively of plant fibres. |
