Pulp and Paper Industry

Pulp is the fibrous material found in paper. While pulp can be made from diverse materials such as cloth rags, hemp, and straw, tree pulp remains the most popular. Trees of small diameters, tree limbs or crowns, or waste from lumber manufacturing are often pulped. Recovered wastepaper has gained importance in recent years. Electronic substitution for print materials has led to some reduction in paper demand, although new product lines also emerge for pulp. For example, fluff pulp is used in baby diapers and other highly absorbent products.

During wood pulping cellulose is separated from lignin, a natural polymer, which bonds the cellulose fibers together to create structure in trees. Mechanical, chemical, or chemi-thermomechanical pulping processes are most often used. The process chosen depends on the ...

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