Grooved long nip shoe press belt

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/02 (2006.01)

Patent

CA 2395748

A resin-impregnated endless belt for a long nip press of the shoe type has a base structure impregnated by a polymeric resin material which renders the belt impermeable to fluids, such as oil, water and air. The polyemic resin material forms layers on the inner and outer sides of the base structure. The inner layer is smooth, but the outer layer has primary grooves for the temporary storage of water pressed from a paper web. The primary grooves are separated by land areas which have secondary grooves extending thereacross to relieve stresses which give rise to flex fatigue and stress cracking.

L'invention concerne une courroie sans fin imprégnée de résine, destinée à une presse à ligne de contact allongée de type à sabot. Cette courroie présente une structure de base imprégnée d'une résine polymère rendant la courroie imperméable aux fluides, tels que l'huile, l'eau, et l'air. La résine polymère forme des couches sur les côtés intérieurs et extérieurs de la structure de base. La couche intérieure est lisse mais la couche extérieure est pourvue de rainures principales qui permettent le stockage provisoire de l'eau générée par le pressage d'une bande de papier. Ces rainures sont séparées par des surfaces d'appui, elles-mêmes pourvues de rainures secondaires qui s'étendent à travers elles de manière à éliminer les contraintes entraînant la fatigue de souplesse et la fissuration sous contrainte.

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