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09-Aug-2020 09:32

The pulp paper-making process is ascribed to Cai Lun, a 2nd-century CE Han court eunuch.In the 19th century, industrialization greatly reduced the cost of manufacturing paper.There are three main chemical pulping processes: the sulfite process dates back to the 1840s and it was the dominant method extent before the second world war.The kraft process, invented in the 1870s and first used in the 1890s, is now the most commonly practiced strategy, one of its advantages is the chemical reaction with lignin, that produces heat, which can be used to run a generator.Papers are essential in legal or non-legal documentation.The pulp papermaking process developed in China during the early 2nd century CE, possibly as early as the year 105 CE, The oldest known archaeological fragments of the immediate precursor to modern paper date to the 2nd century BCE in China.

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The pulp can also be bleached to produce white paper, but this consumes 5% of the fibres; chemical pulping processes are not used to make paper made from cotton, which is already 90% cellulose.

On the paper machine, the most common is the steam-heated can dryer.

These can reach temperatures above 200 °F (93 °C) and are used in long sequences of more than forty cans where the heat produced by these can easily dry the paper to less than six percent moisture.

The paper may then undergo sizing to alter its physical properties for use in various applications. Coated paper has a thin layer of material such as calcium carbonate or china clay applied to one or both sides in order to create a surface more suitable for high-resolution halftone screens.

(Uncoated papers are rarely suitable for screens above 150 lpi.) Coated or uncoated papers may have their surfaces polished by calendering.

In the TMP process, wood is chipped and then fed into steam heated refiners, where the chips are squeezed and converted to fibres between two steel discs.



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