Impulse dryer roll with shell of high thermal diffusivity

D - Textiles – Paper – 21 – F

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D21F 5/02 (2006.01) D21F 3/02 (2006.01) D21G 1/02 (2006.01)

Patent

CA 2173140

In a paper-making machine a roll (22) is composed of two parts: a metallic base shell (38), which is constructed of conventional spun-cast steel alloy, and a thin outer shell (40) constructed of a material of high thermal diffusivity. The outer shell (40) is one to a few tenths of an inch thick and is in intimate contact with the surface of the steel alloy base shell (38). Typical materials of high thermal diffusivity for uses in the outer shell (40) are copper and aluminum. The roll (22) may be formed by flame spraying a layer of copper approximately two-tenths of an inch thick on the surface of a steel alloy base shell (38). The roll (22) is employed where improved heat transfer to a paper web is desired for example in an impulse paper dryer, or in a calendar.

Dans une machine à papier, un cylindre (22) est composé de deux parties: une enveloppe de base métallique (38) en acier allié classique coulé par centrifugation et une enveloppe extérieure mince (40) en un matériau à diffusivité thermique élevée. L'enveloppe extérieure (40) possède une épaisseur d'un à quelques dizièmes de pouce et est en contact étroit avec la surface de l'enveloppe de base en acier allié (38). Les matériaux classiques présentant une diffusivité thermique élevée et constituant l'enveloppe extérieure (40) sont le cuivre et l'aluminium. On peut fabriquer le cylindre (22) par projection à la flamme d'une couche de cuivre d'environ deux dizièmes de pouce d'épaisseur sur la surface d'une enveloppe de base en acier allié (38). On utilise le cylindre (22) afin d'améliorer le transfert thermique sur une bande de papier dans, par exemple, un cylindre sècheur à impulsions ou une calandre.

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