Patent ID: 7669304

Claim:
A process of hydroentangling a fibrous web comprising: positioning the fibrous web on a porous support in translatory movement or rotating about an axis; treating the fibrous web by means of a plurality of streams of water arranged in at least two rows perpendicular to a direction of movement of the fibrous web, the streams having a cylindrical form, wherein the at least two rows comprise streams of a first constant cross-section and streams of a second constant cross-section different from the first cross-section, and at least one row of said at least two rows comprises streams of non-constant spacing; and forming a relief structure in the fibrous web, wherein the streams of the first constant cross-section and the streams of the second constant cross-section hydroentangle the fibrous web creating at least a first region having a first level and a second region having a second level, the first level being distinct from the second level.