Modular construction pattern rolls for use in paper...

B - Operations – Transporting – 31 – F

Patent

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Details

B31F 1/07 (2006.01)

Patent

CA 2137653

The invention comprises a modular pattern roll for embossing a cellulosic fibrous structure. The pattern roll is made by assembling separate components, rather than being one piece and chemically etched according to the prior art. The pattern roll comprises a cylindrically perforate outer shell (40) having radially extending protuberances (30) inserted through the holes in the cylindrical shell (4). The protuberances (30) are provided with an interference fit and/or, if desired, a shoulder (44) at the proximal end to prevent the protuberances (30) from being extruded and expelled through the hole (42) and creating a missile hazard during operation. The center of the hollow cylindrically perforate shell is filled with a base roll (48) and a radially expanding internal locking assembly (64), to prevent the protuberances (30) from moving radially inwardly under the compressive forces which occur during operation.

L'invention comprend une molette à motif modulaire servant à gaufrer une structure cellulosique fibreuse. La molette est composée d'éléments distincts plutôt que d'être monopièce et elle est gravée par procédé chimique selon une technique déja connue. La molette à motif comprend un corps extérieur cylindrique perforé (40) présentant des protubérances (30) s'étendant dans un sens radial et insérées dans les trous du corps cylindrique (4). Les protubérances (30) comprennent un ajustement avec serrage ou, si besoin est, un épaulement (44) à l'extrémité proximale afin d'empêcher que les protubérances (30) ne soient extrudées ou éjectées à travers les trous (42) et constituent ainsi un projectile dangereux au cours de l'opération. Le centre du corps cylindrique perforé et creux est occupé par un rouleau de base (48) et il comprend un assemblage (64) de blocage interne s'avançant dans un sens radial pour prévenir le déplacement des protubérances (30) vers l'intérieur selon un sens radial sous l'effet des forces de compression exercées durant le fonctionnement.

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