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The toughness of paper appears to be a linear function of fiber length. Long fibers from old-growth trees provide a considerable toughness, despite their greater coarseness. This allows about 20% less reinforcement pulp in the printing paper furnish, which in turn has positive effects on the opacity of the paper and the cost of the furnish. The toughness of paper appears to be a linear function of the proportion of reinforcement pulp, thus no effect of percolation transition is found. Differences between the reinforcement pulps appear to vanish with heavy calendering, and thus the “best” pulps should be used in products where the process stages critical for runnability take place before calendering.
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Opacity, Smoothness and Toughness of Mechnical Printing Papers: the Effect of Softwood Kraft Pulp Pr