Method for recycling mixed wastepaper using ink agglomeration

Details Method for recycling mixed wastepaper using ink agglomeration Method for recycling mixed wastepaper using ink agglomeration

D - Textiles, Paper

21

C

D21C 5/02 (2006.01) D21B 1/32 (2006.01) D21D 5/02 (2006.01) D21H 11/14 (2006.01)

Patent

CA 2220520

Recycling of mixed wastepaper, including plastic coated paper and printed paper, is accomplished by repulping (12) the wastepaper mixture to disperse paper fibers, ink and plastic components into a pulp medium. Contact with a deinking chemical causes attraction between the ink components to form larger ink particles. The ink is adsorbed onto the plastic components to form ink/plastic clusters which are removed to produce a substantially ink and plastic free pulp medium. Recycled paper products with improved strength comprising paper fibers from pulp medium produced in accordance with the method of the invention are also provided.

Ce procédé de recyclage de déchets de papier variés, notamment de papier plastifié et de papier imprimé, consiste à refondre (12) le mélange de déchets de papier afin de disperser les fibres de papier, l'encre et le plastique dans la pâte de cellulose. Le contact avec un produit chimique de désencrage attire les particules d'encre entre elles, ce qui aboutit à la formation de particules d'encres plus grosses. L'encre est retenue par adsorption sur les composants plastiques, ce qui aboutit à la formation d'agglomérats encre-plastique, qu'on retire de façon à obtenir une pâte de cellulose sensiblement dépourvue d'encre et de plastique. L'invention concerne également les produits de papier recyclé à résistance améliorée, constitués de fibres de papier provenant de la pâte de cellulose produite suivant le procédé décrit.

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