History
The kraft process (so called because of the superior strength of the resulting paper, from the German word Kraft) was invented by Carl F. Dahl in 1879 in Danzig, Prussia, Germany. U.S. Patent 296,935 was issued in 1884, and a pulp mill using this technology started (in Sweden) in 1890. The invention of the recovery boiler by G.H. Tomlinson in the early 1930s, was a milestone in the advancement of the kraft process. It enabled the recovery and reuse of the inorganic pulping chemicals such that a kraft mill is a nearly closed-cycle process with respect to inorganic chemicals, apart from those used in the bleaching process. For this reason, in the 1940s, the kraft process surpassed the sulfite process as the dominant method for producing wood pulp.
Read more about this topic: Kraft Process
Famous quotes containing the word history:
“If you look at the 150 years of modern Chinas history since the Opium Wars, then you cant avoid the conclusion that the last 15 years are the best 15 years in Chinas modern history.”
—J. Stapleton Roy (b. 1935)
“As History stands, it is a sort of Chinese Play, without end and without lesson.”
—Henry Brooks Adams (18381918)
“The history of all countries shows that the working class exclusively by its own effort is able to develop only trade-union consciousness.”
—Vladimir Ilyich Lenin (18701924)