Method to reduce forming fabric edge curl

Details Method to reduce forming fabric edge curl Method to reduce forming fabric edge curl

D - Textiles, Paper

06

C

D06C 13/00 (2006.01) D21F 1/00 (2006.01) D21F 1/10 (2006.01)

Patent

CA 2203025

A method for reducing or eliminating forming fabric edge curl includes slitting or scoring the knuckles formed by cross-machine direction yarns (14) on the long-shute knuckle side (16) of a papermaker's forming fabric (10). The knuckles are scored or slit to a depth no greater than half the diameter of the cross-machine direction yarns. At least one such slit or score (18) is provided per knuckle (20). The scoring or slitting has the effect of bringing the ratio between the shrink forces acting on the two sides of the forming fabric in the cross-machine direction closer to unity, and, in turn, reduces or eliminates the edge curl resulting from shrinkage in the cross-machine direction.

Procédé de réduction ou d'élimination du roulage des bords d'une toile de formation consistant à fendre ou entailler les éléments articulés formés par les fils (14) dans le sens travers du côté (16) des éléments articulés trame longue d'une toile (10) de machine de fabrication du papier. Les éléments articulés sont entaillés ou fendus à une profondeur inférieure à la moité du diamètre des fils en sens travers. Au moins une fente ou une entaille (18) est formée par élément articulé (20). Faire une entaille ou fente permet de rapprocher de un le rapport entre les forces de retrait agissant des deux côtés de la toile de formation dans le sens travers, et permet également de réduire ou éliminer le roulage des bords dû au retrait dans le sens travers.

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