This is basically correct. The swell and shrink depend on the fiber orientation and on the stress/strain during drying. On the paper machine, the sheet stretches in the machine direction and shrinks in the cross direction. On re-wetting, the sheet expands more in the cross direction than in the machine direction. The MD/CD fiber orientation of the sheet can varying across its width (as can the stress/strain) so that its wet expansion will also vary. While these generalities apply to most fiber base papers, specifics depend on the actual paper in question.
Originally Posted by Sim2