Method for forming and dewatering a web on a fourdrinier fabric
OwnerGlauco Corbellini, Peter A. Rodriguezinventors
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Abstract
Improved system for controlling the forming and dewatering of a web of paper by submerged drainage in which air does not penetrate the fiber/aqueous dispersion and the formed web. The dewatering is via altering the natural tension of the meniscus of the water to induce enhanced drainage of water from the aqueous dispersion of paper making fibers in the wetter end of the system and from the drier end of the fabric. Also, the improved horizontal system provides substantially equivalent side surfaces to the paper formed in such system.
Claims12
A method of removing water from an aqueous fiber dispersion formed into a wet web in contact with an outer surface of a moving Fourdrinier fabric in a paper making process having a wet end portion and a dry end portion which comprises the sequential steps of:
- (a) passing the wet web of fibers and the fabric along and in contact with a meniscus tension unit having a plurality of cells located in the dry end portion, each cell extending to and in contact with an inner surface of the fabric;
- (b) applying a small vacuum to an internal space of each cell of the meniscus tension unit to extract water from the wet web using the tension meniscus of water while preventing air from passing through the wet web;
- and
- (c) permitting air from the atmosphere only to be applied to the inner surface of the fabric to each cell of the meniscus tension unit and thence into the fabric to replace the water removed from the fabric in step (b) thereby enhancing the removal of water from the web and water from the fabric, the atmospheric air passing along and through the interstices between the inner and outer surfaces of the fabric to the internal space of each cell.
Dependencies are inferred from the claim text.