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Requested Publication

Title: Magnesium Bisulfite Pulping and papermaking with southern pine

Source: USFS, Forest Products Laboratory Research Paper; FPL-RP-78; August 1967

Author(s): Keller, E.L.; Fahey, D.J.

Publication Year: 1967  View PDF » Mail this web page's link »

Publication Series: Research Papers

Abstract: Southern pine, which does not respond to the conventional sulfite process because of the phenolic extractives of its heartwood, was readily pulped with magnesium bisulfite. The pitch problem common to pine pulps cooked by nonalkaline processes was avoided by storing the logs for some months before cooking. Although such storage typically results in blue stain of the wood. the unbleached sulfite pulp was much brighter than kraft pulp and was further improved by treatment with brightening agents. The pulp was fully bleached using only chlorine, caustic extraction, and hypochlorite in three stages compared to five-stage bleaching, which included two chlorine dioxide stages, used for a kraft pulp made from the same lot ofwood.

Keywords: Magnesium bisulfite, Pulping, papermaking, southern pine

File size: 469 kb(s)

Date posted: 08/16/2010

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