Method of manufacturing liquid flow guiding structures to porous substrates

摘要

The invention relates to a method for manufacturing liquid- guiding structural layers by flexo or gravure printing on a substrate sheet, using a printing solution, which alters the properties of the substrate sheet in such a way that liquid flow is prevented in the area of the structural layers. The penetrability of the printing layer into the substrate sheet can be regulated by the printing-cylinder pressure and the composition of the printing solution. In the method it is possible to use printing solutions consisting of economical polymers and a solvent. In terms of printing technology, the invention is compatible with existing printing machines and is thus highly suitable for mass production.

主权项

1. A method for manufacturing printed structural layers on a porous substrate sheet for guiding a liquid flow, comprising:
forming the printed structural layers on the substrate sheet by flexo or gravure printing by using a printing solution, which penetrates into the substrate sheet and alters the properties of the substrate sheet in such a way that liquid flow is prevented in the area of the printed structural layers, so that the printed structural layers extend over the entire thickness of the substrate and form a liquid flow channel on the substrate sheet, wherein the printing solution comprises a polymer and a solvent, an amount of the polymer being approximately 5% by weight, the polymer is polystyrene, the solvent is at least one solvent selected from the group consisting of toluene and xylene, at least two printed layers of the printed structural layers are printed at a distance from each other on a front side of the substrate sheet, so that a lateral flow channel is formed between the at least two printed layers of the printed structural layers, and one or more patterned printing solution layer is printed on a front side of the substrate sheet and one or more unified printing solution layer is printed on a rear side of the substrate sheet, so that the unified printing solution layer extends over the entire width of the lateral flow channel and prevents the liquid from in a depth direction from coming through the substrate.