What are the principal differences between newsprint, linerboard, paper, and specialty pulps?
Newsprint is typically made by grinding woodchips into fibers, applying chemicals to whiten the surface of the fibers, then forming a thin sheet of paper amenable for ink. Newsprint fibers are therefore weak, chopped up, brightened wood fibers. Linerboard is unbleached wood fiber produced by an alkaline (Kraft) pulping process and formed into medium-weight sheets that are very dense and strong. These fibers have undergone little chemical or physical damage and retain lignin from the tree, which acts as a natural glue for the fibers. Paper is usually made from fully bleached fibers originating from either an alkaline, neutral or acid pulping process. The combination of pulping and fully bleaching the fibers results in very bright fibers with little residual lignin. These fibers may be made even brighter and smoother when formed into a sheet containing clays, sizing agents and brighteners or they may be used alone to form paper for writing, copying, etc. Specialty pulps or fibers are fib
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