ABSTRACT
It took as long as to 1840 when, in Germany, Friedrich Gottlob Keller invented a method for making a raw material for papermaking directly from wood. His invention of the grinding process was patented in 1840. In the same century, English chemists Hugh Burgess and Charles Watt in 1851 invented a process for manufacturing
12.1 Advantages of Paper Recycling .................................................................. 261 12.2 Recyclability of Paper Products .................................................................264 12.3 Collection Systems for Recovered Paper ...................................................269 12.4 Dry Sorting Technologies .......................................................................... 274 12.5 Classification of Paper for Recycling in Europe (EN 643) ........................280 12.6 Basic Stock Preparation Processes for Recovered Paper Production......... 282
12.6.1 Repulping ......................................................................................285 12.6.2 Coarse Cleaning ...........................................................................287 12.6.3 Screening ...................................................................................... 289 12.6.4 Flotation ........................................................................................ 291 12.6.5 Bleaching ......................................................................................292
