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Groundwood Paper
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A classification of paper in which more than 10% of the pulp content is derived from a mechanical process that grinds wood into pulp. The cellulose in the wood is the major component of the pulp, but since other undesirable components, such as lignin and resins, are not removed, they also become part of the pulp. The lignin is what causes paper to yellow quickly and become brittle, so groundwood stocks are good choices for non-permanent printed items such as newspapers. In addition to this, the wood grinding process produces a pulp with very short fibers so the resulting paper has low tear strength. Groundwood stocks are less bright and less permanent than paper produced from chemical pulp. Chemical fibers are added to many groundwood stocks to give them added strength.
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