Method and apparatus for deinking paper

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 5/02 (2006.01) B08B 3/08 (2006.01) D21H 11/14 (2006.01) G03G 21/00 (2006.01)

Patent

CA 2324280

Deinking a sheet of paper by removing toner thereon including wetting the sheet of paper with a non-toxic, water soluble deinking solution which comprises water, for wetting the sheet of paper to swell the fibers of the sheet, a water soluble surfactant for lowering the surface tension of the water to enhance wetting of the sheet with the water, and no more than two water soluble solvents for softening the toner, without dissolving the toner, and for breaking the bond between the toner and the sheet; removing the softened toner from the sheet, creating toner particles; heating the sheet to vaporize the deinking solution, removing the solution from the sheet; and calendering the sheet of paper to return the sheet to the predetermined dimensions for immediate reuse.

La présente invention concerne le désencrage du papier par élimination du toner qui y est déposé. Ce procédé consiste à mouiller une feuille de papier au moyen d'une solution de désencrage non toxique et hydrosoluble comprenant de l'eau, un tensioactif et un maximum de deux solvants hydrosolubles. L'eau sert à humidifier la feuille de papier de façon à faire gonfler les fibres de la feuille. Le tensioactif sert à abaisser la tension superficielle de l'eau de façon à augmenter le pouvoir mouillant de l'eau sur la feuille. Les solvants hydrosolubles servent, d'une part à ramollir le toner, sans le dissoudre, et d'autre part à rompre la liaison entre le toner et la feuille. Le procédé consiste ensuite à éliminer de la feuille le toner ramolli, à créer des particules de toner, à chauffer la feuille pour vaporiser la solution de désencrage, à éliminer de la feuille la solution et à calandrer la feuille de papier pour rétablir la feuille dans ses dimensions nominales en vue d'une réutilisation immédiate.

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