The invention relates to a double layered paper making forming fabric with a coarse structured running side and a fine structured paper side comprising a longitudinal thread set (yarns in machine direction) and at least two transverse thread sets (yarns in cross-machine direction), which are interwoven...http://www.google.com/patents/US5074339?utm_source=gb-gplus-sharePatent US5074339 - Double layered paper making forming fabric with a coarse structured running side and a fine structured paper side
