Mini-Encyclopedia of Papermaking Wet-End
Part Two: Definitions and Concepts
Relative Bonded Area
The relative bonded area between fibers is determined by light scattering. In theory the amount of light scattered by dry fibers is roughly proportional to their surface area. Part of that surface area effectively disappears in locations where fibers are very close together, i.e. in optical contact. The first step in determining relative bonded area is to form a paper sheet from the same fibers dispersed in a non-swelling solvent such as butanol. Such sheets have little hydrogen bonding between the fibers and very little strength. Light scattering does not give a true measure of bonded area because it is possible for parts of the fibers to be in optical contact (within about 200 nm) without being in molecular contact.
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