A method for manufacturing a fastener includes forming a preform sheet having a sheet-form base and an array of hook-shaped fastener elements extending from a broad side of the base, and securing a cover sheet with an aperture across the array of fastener elements, with fastener elements exposed for...http://www.google.es/patents/US7032278?utm_source=gb-gplus-sharePatente US7032278 - Hook fastener engaging zones
