Method and device for hydroentangling a web made of a fibrous cellulose product, and a web of this type
The invention relates to a process of hydroentangling a fibrous web (N) including of positioning the web on a porous moving support ( 10 ) in translatory movement or in rotation about an axis, and of treating at least one side of the web by means of a plurality of streams of water arranged in a row perpendicular to the direction of movement of the web, characterized in that the row includes streams with a first cross-section ( 14 A) and at least streams with a second cross-section ( 24 A) different from the first. The invention also relates to a process including treatment of the web by means of a plurality of streams of water arranged in at least two rows perpendicular to the direction of movement of the web. The rows include streams with a first cross-section ( 14, 16, 17, 18, 19 ) and at least streams with a second cross-section ( 24, 26, 27, 28, 29, 39 ) different from the first cross-section, at least one row including streams the spacing of which is not constant. This process may be applied to produce webs the state of the surface of which varies.
1. A process of hydroentangling a fibrous web comprising positioning the web on a porous support in translatory movement or rotating about an axis, treating one side of the web by means of a plurality of streams of water arranged in a row perpendicular to a direction of movement of the web, the streams having a cylindrical form, wherein the row comprises streams of a first constant cross-section and streams of a second constant cross-section different from the first cross-section.
2. A process as defined in claim 1 , wherein both sides of the web are treated.
3. A process as defined in claim 1 , wherein the web comprises cellulose fibers.
4. A process of hydroentangling a fibrous web comprising positioning the web on a porous support in translatory movement or rotating about an axis, treating the web by means of a plurality of streams of water arranged in at least two rows perpendicular to a direction of movement of the 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, wherein said treating is with streams arranged in from two to four rows, wherein a first row comprises streams made up of groups spaced at intervals from each other, and a second row comprises streams not in alignment in the direction of movement of the web with the streams of the first row, and wherein the first row comprises streams with the first cross-section and streams with the second cross-section, and a second row comprises streams with the second cross-section or streams with the second cross-section and streams with a third cross-section.