A backside textured papermaking belt is disclosed which is comprised of a framework and a reinforcing structure. The framework has a first surface which defines the paper-contacting side of the belt, a second surface opposite the first surface, and conduits which extend between first and second surfaces...http://www.google.de/patents/US5514523?utm_source=gb-gplus-sharePatent US5514523 - Papermaking belt and method of making the same using differential light transmission techniques
