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Paper production is mainly a two-step process in which a fibrous raw material is first converted into pulp, and then the pulp is converted into paper. The harvested wood is first processed so that the fibres are separated from the unusable fraction of the wood, the lignin.
The pulp and paper industry comprises companies that use wood, specifically pulpwood, as raw material and produce pulp, paper, paperboard, and other cellulose-based products. Diagram showing the sections of the Fourdrinier machine
Paper is made through the following processes: 1) Pulping procedure will be done to separate and clean the fibers. 2) Refining procedure will be followed after pulping processes. 3) Dilution process to form a thin fiber mixture. 4) Formation of fibers on a thin screened. 5) Pressurization to enhance the materials density.
A pulp mill is a manufacturing facility that converts wood chips or other plant fibre source into a thick fiberboard 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).
In general, pulp, which is the raw material of paper, can be manufactured using two methods: chemical pulping or mechanical pulping. The first one involves breaking down the chemical structure of lignin into a liquid using different chemicals, including sodium hydroxide and sodium sulfide.
Jan 1, 2013 · Manufacturing of pulp starts with raw material preparation (Smook 1992; Biermann 1996 ). This includes debarking (when wood is used as raw material), chipping, and other processes such as depithing (for example, when bagasse is used as the raw material).
Oct 28, 2011 · The main steps in pulp and paper manufacturing are: Raw material preparation and handling, Pulp manufacturing, Pulp Washing and Screening, Chemical recovery, Bleaching, Stock Preparation, and Papermaking. Pulp mills and paper mills may exist separately or as integrated operations. An integrated mill is one that conducts pulp manufacturing on-site.
