Forming fabric with interposing cross machine direction yarns

Details Forming fabric with interposing cross machine direction yarns Forming fabric with interposing cross machine direction yarns

D - Textiles, Paper

21

F

139/64, 92/17.7

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

Patent

CA 2022665

A papermakers' fabric, especially a forming fabric, with very high fiber support and open area on its top surface for superior papermaking characteristics. The papermaking surface consists of a woven fabric layer with single float machine direction yarn knuckles; i.e., no machine direction yarn passes over two or more adjacent top surface cross machine direction yarns. To complete the papermaking surface, into this base structure is woven two additional, generally smaller diameter, cross machine direction yarns for every cross machine direction yarn in the base weave papermaking surface. These two additional cross machine direction yarn pairs are woven in reverse weave patterns to one another such that natural interposing forces cause the two yarns to align one over the other centrally between two adjacent cross machine direction yarns of the fabric layer. One yarn of the interposing pair functions as an additional fiber supporting yarn while the other yarn acts as a locator yarn to position the fiber supporting yarn in the proper or ideal location on the papermaking surface.

Cette invention concerne une toile de machine à papier, en particulier une toile de formation, offrant un très bon supportage et haute perméabilité côté feuille, caractéristiques propres à rehausser la qualité du produit obtenu. La toile côté feuille se compose d'une couche tissée à boucles support simples sens machine, c'est-à-dire un tissu où aucun fil sens machine passe au-dessus de deux fils sens travers adjacents ou plus côté feuille. Pour compléter le côté feuille, on tisse dans cette couche de base pour chaque fils sens travers deux autres fils sens travers de diamètre généralement plus petit. Ces deux fils sens travers additionnels sont tissés selon un motif inversé l'un par rapport à l'autre de sorte que les forces naturelles d'interposition entraînent l'alignement centré des deux fils l'un au-dessus de l'autre entre deux fils sens travers adjacents du tissu. Un des fils de la paire interposée fait office de fil additionnel de supportage des fibres tandis que l'autre fil de la paire sert de fil de positionnement approprié ou optimale du fil support côté feuille de la toile.

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