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The substitution of birch for spruce-balsam ground in the newsprint furnish

The substitution of birch for spruce-balsam ground in the newsprint furnish

Pulp And Paper Mag Canada 44(2): 148-151

Birch wood with an average density of 0.495 and moisture content of 28.5% produced groundwood pulps with Mullen strengths 10% of normal for spruce and tear values 15% of normal, with a bulk increase of 45%. Paper-machine trials with birch groundwood at 4% of the mixed furnish indicated that Mullen and tensile strengths and paper smoothness were lowered, while bulk increased. Machine efficiency dropped slightly, and sewer losses increased through higher return-water consistencies. There was no measurable improvement in opacity of the news sheet and it was less bright than with the normal furnish. This paper operated well on the printing presses, but was inferior in smoothness, transparency, and the actual printing. The detrimental effect of these particular birch groundwoods, in varying %'s of the mixed furnish, was more than directly proportional to the % of birch.

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