Manufacture of paper

D - Textiles – Paper – 21 – H

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Details

D21H 23/16 (2006.01) D21H 17/28 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2167803

Paper strengthened by starch, typically in amounts of 3 to 15 % dry weight, is made by flocculating a cellulosic suspension using a polymeric retention aid which can be dissolved cationic starch but is preferably a synthetic polymer having IV above 4dl/g, optionally shearing the resultant flocculated suspension and reflocculating it by adding bentonite or other microparticulate anionic material, draining the flocculated or reflocculated suspension and drying the resultant wet sheet, wherein insoluble particles of starch are added to the suspension as a slurry of substantially freely dispersed particles in part or all of the aqueous solution of the polymeric retention aid or in part or all of the aqueous suspension of microparticulate anionic material.

On fabrique du papier renforcé à l'amidon, généralement à raison de 3 à 15 % en poids sec, en floculant une suspension cellulosique avec un adjuvant de rétention polymère qui peut être de l'amidon cationique dissous mais est de préférence constitué d'un polymère de synthèse à viscosité intrinsèque dépassant 4 dl/g, puis en cisaillant éventuellement cette suspension floculée résultante et en la re-floculant par adjonction de bentonite ou d'une autre substance anionique à microparticules, en drainant cette suspension floculée ou refloculée et en séchant la feuille humide résultante. Des particules d'amidon isolubles sont ajoutées à la suspension sous forme d'une pâte de particules dispersées de façon pratiquement libre dans tout ou partie de la solution aqueuse de l'adjuvant de rétention polymère ou dans tout ou partie de la suspension aqueuse de la substance anionique à microparticules.

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