Method and adjuvant composition to improve retention of...

D - Textiles – Paper – 21 – H

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D21H 17/48 (2006.01) D21H 17/51 (2006.01) D21H 17/53 (2006.01) D21H 21/10 (2006.01) D21H 17/06 (2006.01) D21H 17/09 (2006.01) D21H 23/76 (2006.01)

Patent

CA 2207017

Disclosed is a method for the production of paper and an adjuvant composition comprising the following ingredients: 30 to 80 % by weight of phenolic resin or modified phenolic resin; 10 to 50% by weight of melamine resin; and 5 to 35% by weight of at least one naphthalene sulphonate salt. The ingredients are under granulated form or dissolved in an aqueous solution. The method comprises the step of admixing the adjuvant composition with a solution of one or several polyethylene oxide having a molecular weight varying from 1 x 106 to 13 x 106 and with an aqueous mixture comprising lignocellulosic particles and an aqueous medium to significantly improve the retention of particles such as fines and fibers, on a wire screen and the drainage of the aqueous medium.

Méthode pour la fabrication de papier et composition d'addition renfermant les ingrédients suivants : 30 à 80 % en poids de résine phénolique ou de résine phénolique modifiée; 10 à 50 % en poids de résine de mélamine; 5 à 35 % en poids d'au moins un sel de naphtalènesulfonate. Les ingrédients sont sous forme granulaire ou à l'état dissous dans une solution aqueuse. La méthode consiste à mélanger la composition d'addition avec une solution d'un ou de plusieurs poly(oxyde d'éthylène) de masse moléculaire variable, 1 x 106 à 13 x 106, et avec un mélange aqueux renfermant des particules lignocellulosiques et un milieu aqueux; cela permet d'améliorer nettement la rétention de particules, comme les fines et les fibres, sur un tamis, et de faciliter l'écoulement du milieu aqueux.

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