| 摘要 |
<p>1. Process for removing colour particles from a fibre suspension obtained from waste paper by sorting, washing-out and flotation of the fibre suspension, characterised in that the entire fibre suspension to be cleaned is washed-out under pressure and simultaneously passed over a screen (212) of such screening fineness as to obtain a washed, first suspension portion that contains almost all the usable fibres before the screen (212) and a washed-out, second suspension portion that has passed through and contains colour particles and the rest of the fibres, and in that the first suspension portion is sorted and the second suspension portion is freed from the colour particles by flotation.</p> |
