An extended nip press section apparatus

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/02 (2006.01)

Patent

CA 2325914

An extended nip press section apparatus (10) is disclosed for pressing water from a formed web (W). The apparatus includes an elongated press shoe (14) and a vented backing roll (16) which cooperates with the shoe (14) for defining therebetween an extended nip (18) for the passage therethrough of the web. A bearing blanket (20) slidingly cooperates with the shoe (14) and extends through the extended nip, the blanket (20) being disposed between the web (W) and the shoe (14). A pick-up felt (22) extends through the extended nip for conveying the web to and through the extended nip. A press felt (24) extends through the extended nip such that the web (W) is disposed between the press felt (24) and pick-up felt (22) during movement of the web through the extended nip. The press felt (24) has a water permeability which is less than the water permeability of the pick-up felt (22) such that the web (W) predictably follows the press felt (24) rather than the pick-up felt (22) when the pick-up felt diverges relative to the press felt downstream relative to the extended nip, the arrangement being such that two-sidedness of the resultant pressed web (W) is inhibited.

Cet appareil à presse à pince allongée (10) est destiné à exprimer l'eau présente dans un voile (W) formé. L'appareil comporte un sabot de presse de forme allongée (14) et un contre-rouleau ventilé (16) coopérant avec celui-ci, définissant ainsi une pince allongée (18) au travers de laquelle passera le voile. Un blanchet de support (20) coopère de façon coulissante avec le sabot (14) et traverse la pince allongée, étant placé entre le voile (W) et le sabot (14). Un feutre de transfert (22) passe à travers la pince allongée pour transporter le voile vers cette pince et lui faire traverser celle-ci. Un feutre de presse (24) passe à travers la pince allongée de sorte que le voile (W) vient se placer entre le feutre de presse (24) et le feutre de transfert (22) durant son passage à travers la pince allongée. La perméabilité à l'eau du feutre de presse (24) est inférieure à celle du feutre de transfert (22) de sorte que le voile (W) est davantage susceptible de suivre le feutre de presse (24) que le feutre de transfert (22) lorsque celui-ci s'écarte du feutre de presse vers l'aval par rapport à la pince allongée, l'agencement étant tel qu'un aspect "double face" du voile (W) foulé est évité, ce qui revient à dire que l'on obtient un voile dont les deux faces ont des caractéristiques de surface identiques.

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