Method for making low-density tissue with reduced energy input

D - Textiles – Paper – 21 – F

Patent

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D21F 11/14 (2006.01)

Patent

CA 2307675

A noncompressive dewatering device generates air streams that can be used to remove water from cellulosic webs in an energy efficient manner. Further, a wet-pressed machine can be modified to economically produce low-density tissue with an energy/capital efficiency greater than that of the throughdrying process. For instance, a cellulosic web can be non-compressively dewatered from a post forming consistency to a consistency from about 25 percent to the water retention consistency by passing air through the web with an Energy Efficiency at least 10 percent greater than that achievable using vacuum dewatering at the same speed. In particular embodiments, the web may be non- compressively dewatering to a consistency of at least 70 percent of the water retention consistency using about 13 or less horsepower per inch of sheet width, or to a consistency of at least 80 percent of the water retention consistency using about 30 or less horsepower per inch of sheet width, both at a speed of 2500 feet per minute or greater.

La présente invention concerne un dispositif d'égouttage non compressif qui produit des courants d'air pouvant être utilisés pour égoutter des bandes cellulosiques de manière énergétiquement efficace. En outre, on peut modifier une machine de pressage humide pour produire, de manière économique, un papier tissu basse densité avec un rendement énergie/capital supérieur à celui du processus de séchage. On peut, par exemple, égoutter une feuille cellulosique de manière non compressive, d'une consistance postformable pour obtenir une consistance d'environ 25 % de la consistance de rétention d'eau, en faisant passer de l'air avec une efficacité énergétique supérieure d'au moins 10 % à celle obtenue par égouttage sous vide. Selon des modes de réalisations particuliers, on peut égoutter la bande de manière non compressive jusqu'à une consistance d'au moins 70 % de la consistance de rétention d'eau en utilisant environ 13 chevaux vapeur ou moins par pouce de largeur de feuille, ou jusqu'à une consistance d'au moins 80 % de la consistance de rétention d'eau en utilisant environ 30 chevaux vapeur ou plus par pouce de largeur de bande, à une vitesse de 2 500 pieds par minute.

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