Pulp Mill

A pulp mill is a manufacturing facility that converts wood chips or other plant fibre source into a thick fibre board which can be shipped to a paper mill for further processing. Pulp can be manufactured using mechanical, semi-chemical or fully chemical methods (kraft and sulfite processes). The finished product may be either bleached or non-bleached, depending on the customer requirements.

Wood and other plant materials used to make pulp contain three main components (apart from water): cellulose fibres (desired for papermaking), lignin (a three-dimensional polymer that binds the cellulose fibres together) and hemicelluloses, (shorter branched carbohydrate polymers). The aim of pulping is to break down the bulk structure of the fibre source, be it chips, stems or other plant parts, into the constituent fibres.

Chemical pulping achieves this by degrading the lignin and hemicellulose into small, water-soluble molecules which can be washed away from the cellulose fibers without depolymerizing the cellulose fibres (chemically depolymerizing the cellulose weakens the fibres). The various mechanical pulping methods, such as groundwood (GW) and refiner mechanical (RMP) pulping, physically tear the cellulose fibres one from another. Much of the lignin remains adhering to the fibres. Strength is impaired because the fibres may be cut. There are a number of related hybrid pulping methods that use a combination of chemical and thermal treatment to begin an abbreviated chemical pulping process, followed immediately by a mechanical treatment to separate the fibres. These hybrid methods include thermomechanical pulping (TMP) and chemithermomechanical pulping (CTMP). The chemical and thermal treatments reduce the amount of energy subsequently required by the mechanical treatment, and also reduce the amount of strength loss suffered by the fibres.

Read more about Pulp Mill:  The Mill, See Also

Other articles related to "pulp mill, pulp, mill":

Air Pollution In British Columbia - Clean Air Advocacy
... to burn car tires (tire derived fuel) to generate energy in their Crofton pulp mill ... Reach For Unbleached is an organization with a special interest in pulp mill pollution issues in BC ... They also discuss their allegations that provincial monitoring misses pulp mill wastes ...
Sheet Harbour, Nova Scotia - Industry
1885 the Halifax Wood Fibre Company located the first sulphide pulp mill in Canada at East River, Sheet Harbour ... Later on October 5th a ground-wood pulp mill owned by the American Pulp and Wrapping Paper Co ... This pulp mill replaced a saw mill owned by Rhodes Currie and remained in operation until destroyed by hurricane Beth in 1971 ...
Bell Bay Pulp Mill
... The Bell Bay Pulp Mill, also known as the Tamar Valley Pulp Mill or Gunns Pulp Mill, is a proposed $2.3 billion pulp mill which Gunns Limited is ...
Bell Bay Pulp Mill - Opposition
... Opponents of the mill include a number of environmental, social activist and political groups including The Wilderness Society, and TAP into a better Tasmania (formerly ... protests around the entire state and especially in the north since the pulp mill was proposed ... In September 2006, a protest rally against the proposed pulp mill was held in Launceston with speakers, included Greens politician Christine Milne and TV gardener Peter Cundall ...
Pulp Mill - See Also
... Bleaching of wood pulp Kraft process Paper mill Pulp mill dispute Sulfite process Wood pulp ...

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