So you already know what wet felting is and look for further details on nuno felting? It is a very young technique of bonding loose fibers with sheer fabric to create lightweight felt. It was discovered in 1992. Japanese word ‘nuno’ means cloth.
With this basic knowledge you can try to imagine a colander and pasta. When you hold the colander still, only a small amount of pasta passes through its holes. Shaking it, you can only increase the mess. In nuno felting the mess is actually something you want. Wool fibers are your pasta. Silk, linen or other fabric with its open weave is your colander.
Remember rubbing wool during the wet felting process? Nuno felting works the same. You try to increase the fibers’ mess, making links between wool and fabric stronger and stronger.