Abstract
87 fiber-fiber bonds from an unbleached and unbeaten softwood kraft pulp were analyzed. The statistical evaluation of the results showed that basic geometry (fiber width and crossing angle) explain only 55% of bonded area. Incomplete bonding (holes and overlapping but unbonded edges) additionally account for 27% of the bonded area, while fiber morphology only plays a minor role. This is a contradiction to the conventional theory that fiber conformability controls the bonded area in paper. An explanation for this might be that one cannot rationalize the three-dimensional network of paper directly from twodimensional fiber-fiber bonds.
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