D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 17/22 (2006.01) D21H 21/10 (2006.01) D21H 11/14 (2006.01) D21H 17/00 (2006.01)
Patent
CA 2251191
To improve the drainage and consequently the machine speed in making paper or paperboard from recycled paper, a starch hydrolysing enzyme [alpha-amylase] is added prior to the forming section. The enzyme must be active in the temperature range of 40 to 90 ~C and in the pH range of 6 to 9. Amounts as low as 0.05 % by weight of the oven dried paper forming the pulp can allow increases in machine speeds of about 5 % or more.
Afin d'améliorer l'égouttage et par conséquent la vitesse de la machine lors de la fabrication de papier ou de carton à partir de papier recyclé, on ajoute une enzyme hydrolysant l'amidon (une alpha-amylase) avant le passage de la pâte dans la section de formation de la feuille. Cette enzyme doit être active dans une plage de températures se situant entre 40 et 90 ·C et dans une gamme de pH comprise entre 6 et 9. Des quantités enzymatiques pondérales aussi faibles que 0,05 % du poids du papier séché à l'étuve et formant la pâte permettent d'augmenter les vitesses de la machine d'au moins 5 % ou davantage.
Osler Hoskin & Harcourt Llp
Participant Project Ip Limited
LandOfFree
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