A papermakers felt having improved void volume and a method for manufacturing of the felt are disclosed. The felt as woven comprises at least three plies with one ply being comprised of removable yarns. Through removal of the removable yarns, a series of voids are created in the final felt....http://www.google.com.au/patents/US4537816?utm_source=gb-gplus-sharePatent US4537816 - Papermakers superimposed felt with voids formed by removing yarns
