Multi-layer screen for the wet area of a paper machine and...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/00 (2006.01) D03D 11/00 (2006.01) D21F 11/00 (2006.01)

Patent

CA 2297800

The invention relates to a multi-layer screen (10, 11) for the wet area of a paper machine and to a tissue paper produced using the same. The inventive screen consists of threads, preferably woven threads, forming at least two layers. These layers are joined to each other by additional threads (14) which are interlaced with the layers. Together with the threads which make up the layers, the additional threads (14) form constricted points (16), said constricted points being spread across the length and breadth of the screen. A significantly less quantity of water can pass through these points than through the areas adjacent thereto. Arranged in special sequences, the additional threads are a means of influencing the drainage of water through the screen at the constricted points for producing tissue paper with alternating areas of high and low GSM substance. The invention therefore provides a simple means of producing a tissue paper with a flexible, thin, non- homogeneous, net-like structure.

L'invention concerne une toile multicouche (10, 11) destinée à la région humide d'une machine à papier, ainsi qu'un papier de soie fabriqué avec cette toile, laquelle est constituée de fils, de préférence de fils tissés en au moins deux nappes, qui sont reliés entre eux par des fils supplémentaires (14) entrelacés avec les nappes. Ces fils supplémentaires (14) forment, conjointement avec les fils constituant les nappes, des rétrécissements (16) répartis sur la largeur et la longueur de la toile et par lesquels peut s'écouler nettement moins d'eau que par les régions voisines. Disposés dans une séquence particulière, ces fils supplémentaires servent, au niveau des rétrécissements, de moyen pour influer sur l'égouttage à travers la toile en vue de fabriquer du papier de soie présentant des zones alternées de grammage élevé et de grammage faible. On obtient ainsi d'une manière particulièrement simple un papier de soie possédant une structure souple, mince, non homogène et réticulaire.

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