Manufacture of paper

D - Textiles – Paper – 21 – H

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D21H 21/10 (2006.01) D21H 17/42 (2006.01) D21H 17/44 (2006.01) D21H 17/68 (2006.01) D21H 23/76 (2006.01) D21H 17/71 (1995.01)

Patent

CA 2168092

Paper is made by forming a thick stock cellulosic suspension, flocvulating the thick stock by adding a relatively high molecular weight and relatively low cationic charge density polymer, diluting the flocculated thick stock to form a thin stock and then draining the thin stock to form a sheet. Usually coagulant is added to the thin stock before drainage and best results are achieved by adding coagulant followed by anionic colloidal material such as bentonite. The process can be operated to give good retention and good formation and, if the thick stock is dirty, to minimise pitch problems.

On fabrique du papier en formant une suspension cellulosique contenant une pâte à papier épaisse, en floculant cette pâte épaisse par adjonction d'un polymère à poids moléculaire relativement élevé et densité de charge cationique relativement faible, en diluant cette pâte épaisse floculée pour qu'elle forme une pâte mince puis en drainant cette pâte mince pour qu'elle forme une feuille. On ajoute généralement un agent de coagulation à la pâte mince avant drainage et on obtient les meilleurs résultats en ajoutant l'agent de coagulation puis une substance colloïdale anionique telle que de la bentonite. On peut utiliser ce procédé pour obtenir une bonne rétention et une bonne mise en forme, et si la pâte épaisse est souillée, pour minimiser les problèmes de substances gluantes.

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