Interactions in fiber-fiber joints: • Interaction in crossed cellulosic fiber joints between was studied by atomic force colloidal probe microscopy (AFM) and mapping of surfaces and bonding sites using confocal Raman microspectroscopy (CRM) • CRM imaged surfaces and joints on thermomechanical pulp fibers, bleached pulp fibers and rayon fibers • Chemical and structural constituents relevant for bonding at high enough resolution can be imaged • Differences due to stresses or strains at, or close to, the fiber-fiber bonded area was detected but could not be evaluated. • Clean rayon fibers and bleached kraft pulp fibers, attached to an AFM cantilever and to the edge of an AFM chip, were brought in contact in a 90° crossed configuration • Forces measured in humid air and in water during approach and during retract • Bleached kraft pulp fiber-fiber joints can measured combined in adhesion and friction • Rayon fibers at different RH's give influence of capillary attraction at cross-points. Adhesion values significantly less than predicted by capillary attraction, due to roughness.