Method of forming decorative tissue sheets
Forming fabrics for making tissue webs are provided with structural icons on the side of the fabric that does not contact the tissue web during formation. The resulting tissue web has good formation without pinholes, yet contains a watermark corresponding to the shape of the structural icon.
1. A method of forming a tissue sheet in which papermaking fibers are deposited onto a forming fabric and retained on the surface of the forming fabric to form a sheet having a basis weight of from about 10 to about 40 grams per square meter, the forming fabric having a sheet-contacting side and an opposite machine-contacting side, wherein the forming fabric comprises one or more pixilated structural icons on the machine-contacting side of the forming fabric which create a watermark in the sheet during formation, said pixilated structural icons being formed from a multiplicity of spaced-apart elements having a size of from about 0.2 to about 2 millimeters, a spacing of from about 0.2 to about 2 millimeters, and a density of from about 25 to about 500 elements per square centimeter.
2. The method of claim 1 wherein the sheet is air-formed by depositing the papermaking fibers onto the forming fabric while the papermaking fibers are suspended in air.
3. The method of claim 1 wherein the sheet is wet-formed by depositing the papermaking fibers onto the forming fabric while the papermaking fibers are suspended in water.
4. The method of claim 1 wherein the elements are dots.
5. The method of claim 1 wherein the elements are squares.
6. The method of claim 1 wherein the elements are triangles.
7. The method of claim wherein the elements are hexagons.
8. The method of claim 1 wherein the element density is from about 50 to about 300 elements per square centimeter.
9. The method of claim 1 wherein the size of the elements is from about 0.2 to about 0.8 millimeter.
10. The method of claim 1 wherein the size of the elements is from about 0.4 to about 0.6 millimeter.
11. The method of claim 1 wherein the basis weight of the tissue sheet is from about 10 to about 30 grams per square meter.
12. The method of claim 1 wherein the basis weight of the tissue sheet is from about 10 to about 20 grams per square meter.