Method for forming cover for industrial roll

B - Operations – Transporting – 29 – C

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B29C 53/58 (2006.01) D21G 1/02 (2006.01)

Patent

CA 2523049

A process for forming a cover for an industrial roll includes the steps of: providing an elongate cylindrical core (20) having a longitudinal axis (A1); rotating the core (20) about the longitudinal axis (A1); providing a nozzle (22) movable along a nozzle path (N) that is substantially parallel to and above the core longitudinal axis, the nozzle (22) having at least an upstream outlet (24) and a downstream outlet (26), the nozzle outlets being longitudinally offset a distance (d) from each other; and applying multiple strips of polymeric material to the core through the nozzle outlets as the nozzle moves along the nozzle path such that the downstream strip (28) forms an overlapping spiral inner layer and the upstream strip (36) forms an overlapping spiral outer layer that overlies the inner layer, the inner and outer layers being adhered with the core (20).

L'invention concerne un procédé permettant de former un élément de couverture pour un rouleau industriel. Ce procédé comprend les étapes consistant : à utiliser une âme cylindrique allongée (20) présentant un axe longitudinal (A1); à faire tourner l'âme (20) autour de l'axe longitudinal (A1); à utiliser un ajutage (22) pouvant être déplacé le long d'un chemin d'ajutage (N) qui est sensiblement parallèle à l'axe longitudinal de l'âme et qui se situe au-dessus de celui-ci, l'ajutage (22) présentant au moins une sortie amont (24) et une sortie aval (26), les sorties de l'ajutage étant décalées l'une par rapport à l'autre longitudinalement par une distance (d); et à appliquer plusieurs bandes de matériau polymère sur l'âme à travers les sorties de l'ajutage à mesure que ce dernier se déplace le long du chemin de façon que la bande aval (28) forme une couche intérieure spiralée en chevauchement et que la bande amont (36) forme une couche extérieure spiralée en chevauchement qui recouvre la couche intérieure, les couches intérieure et extérieure étant collées à l'âme (20).

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