The use of wood to make paper is a relatively recent invention. In 1800, fiber crops such as flax fibers are the primary source of the material, and the paper was a relatively expensive well. Wood for making paper pulp has begun development of mechanical FG Keller in Germany in 1840, and a Canadian inventor Charles Fenerty Nova Scotia. Shortly after the chemical processes, the former J. Roth has sulfuric acid used to treat wood, followed by B. Tilghman 's U.S. patent, the use of bisulphide of calcium, Ca (HSO3) 2, wood pulp in 1867. Almost ten years later, the first commercial sulfite pulp mill was built in Sweden. It 'used to fight the magnesium ion and was based on the work of Carl Daniel Ekman. In 1900 sulfite pulping had become the dominant mode of production of pasta over the mechanical pulping methods. competitive pulp, sulphate or Kraft was developed by Carl F.
Global production of wood pulp in 2006 was 160 million tonnes (175 million tonnes). In the previous year 57 million tons (63 million tons) of market pulp (not the production of paper from the same plant) were sold, with Canada is the largest source of 21% of the total, followed by the United States of 16%. Pulp consisting of 93% wood pulp.
Dahl in 1879 and the first kraft mill started (Sweden) in 1890. The invention of the recovery boiler by GH Tomlinson in the early 1930 can be kraft mills to recycle almost all chemical pulp. This, along with the ability to accept more different types of wood kraft process and produce strong fibers predominant kraft pulping process to begin in 1940. (@ agriculture commodities)
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