Manufacture of paper and paperboard

Details Manufacture of paper and paperboard Manufacture of paper and paperboard

D - Textiles, Paper

21

H

D21H 23/76 (2006.01) D21H 17/24 (2006.01) D21H 17/33 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01) D21H 17/28 (2006.01) D21H 17/43 (2006.01) D21H 23/14 (2006.01)

Patent

CA 2389393

A process for making paper comprising forming a cellulosic suspension, flocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet, wherein the cellulosic suspension is flocculated by addition of a water soluble polymer which is selected from a) a polysaccharide or b) a synthetic polymer of intrinsic viscosity at least 4 dl/g and then reflocculated by a subsequent addition of a reflocculating system, wherein the reflocculating system comprises i) a siliceous material and ii) a water soluble polymer. In one aspect the siliceous material is added prior to or simultaneous with the water soluble polymer. In an alternative for the water soluble polymer is anionic and added prior to the siliceous material.

L'invention concerne un procédé de fabrication de papier consistant à former une suspension cellulosique, à floculer ladite suspension, à l'égoutter sur un tamis de manière à former une feuille puis à sécher ladite feuille. La suspension cellulosique est floculée par addition d'un polymère soluble dans l'eau choisi entre a) un polysaccharide ou b) un polymère synthétique ayant une viscosité intrinsèque d'au moins 4 dl/g, et elle est ensuite refloculée par addition subséquente d'un système de refloculation, ledit système comprenant i) une matière siliceuse et ii) un polymère soluble dans l'eau. Selon un aspect de l'invention, la matière siliceuse est ajoutée avant ou simultanément au polymère soluble dans l'eau. Selon un autre aspect de l'invention, le polymère soluble dans l'eau est anionique et il est ajouté avant la matière siliceuse.

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