Method and apparatus for calendering paper with internally...

D - Textiles – Paper – 21 – G

Patent

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Details

D21G 1/02 (2006.01) D21G 1/00 (2006.01) F16C 13/00 (2006.01)

Patent

CA 2097724

Disclosed is a new internally heated calendering roll capable of finishing paper satisfactorily at the temperatures, heat loads and pressures required for substrata thermal molding. The roll is internally heated and has a circumferential wall at least 4 inches thick. It includes means to provide heat into the interior of the circumferential wall to be conducted through the wall to the outer surface for heating the paper web being calendered by the roll. The roll is constructed of a first material with a thin circumferential surface layer of a second, cermet or ceramic containing material. The surface layer material has a hardness of at least 530 Vickers and a thickness of between .003 inch and .030 inches. It is capable of being polished to a roughness of less than 6 micro inches Ra. The roll has uniformly spaced conduits for passing heated fluid located no more than 2 inches from the outer edge of the conduits to the circumferential surface. The roll is capable of conducting at least 8,500 BTU/Sq. Ft./Hr. heat through the roll without creating tensile hoop stress in excess of 1/2 of the yield strength of the first material.

Nouveau rouleau de calandrage à chauffage interne capable de finir le papier de manière satisfaisante à des températures, des charges de refroidissement et des pressions nécessaires au moulage thermique de substrat. Le rouleau est chauffé intérieurement et a une paroi périphérique d'au moins 4 pouces d'épaisseur. Le rouleau comprend des dispositifs pour fournir de la chaleur à l'intérieur de la paroi périphérique, qui se déplace à travers la paroi vers la surface extérieure pour chauffer la bande de papier calandrée par le rouleau. Le rouleau est construit d'un premier matériau recouvert d'une mince couche d'un deuxième matériau contenant du cermet ou de la céramique. Le matériau de la couche de surface possède un indice de dureté d'au moins 530 Vickers et une épaisseur entre 0,003 et 0,030 pouces. Il a la capacité d'être poli à une rugosité inférieure à 6 micropouces Ra. Le rouleau est muni de conduits uniformément espacés pour laisser passer le fluide réchauffé, situés à 2 pouces ou moins du bord extérieur des conduits, vers la surface périphérique. Le rouleau est capable d'écouler au moins 8 500 BTU/pi carré/h de chaleur à travers le rouleau sans créer de tension circonférentielle de traction de plus de 1/2 de la limite d'élasticité conventionnelle du premier matériau.

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