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The undesirable odour (usually at pulp mills, which are a little different from paper mills) is caused principally by process by-products, specifically the reduced sulfur gases resulting from the cooking process. Thankfully, these airborne particles are not harmful to the health of the community, but they are considered a nuisance. The Kraft process of reducing wood logs to their fibre constituent is primarily responsible for the odour, as opposed to the sulfite process.
Paper mills can be fully-integrated mills or smaller processing mills. The integrated mill will receive the whole forest log (or wood chips), process it down to the individual fiber level and into a 4% (approximately) pulp slurry, then process that pulp slurry into a sheet of paper. Non-integrated mills cannot process the log or wood chips but instead purchase preprocessed pulp slurry in a dried and baled form, known as market pulp , from pulp mills. The pulp bales are then rehydrated into a 4% solution in order to be processed into a sheet of paper.
The modern paper mill uses large amounts of energy, water, and woodThis article describes the wood that comprises trees and boards. For the Chinese element, see wood (classical element). For the town, see Wood, South Dakota or Wood, Wisconsin. For the type of golf club, see golf club (equipment). Veluwe, The Netherlands in a highly efficient and extremely complex series of processes, using modern and sophisticated controls technologyTechnology ( Gr. tau;εχνολογια < τεχνη "craftsmanship" + λογος "word, reckoning" + the suffix ια) has more than one definition. to produce a sheet of paper that can be used in incredibly diverse ways. Modern paper machines are very large and can be 500 feet in length, produce a sheet 400 inches wide, and operate at speeds of over 100 mph.