Method and system for producing wet-pressed, molded tissue...

D - Textiles – Paper – 21 – F

Patent

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D21F 11/14 (2006.01)

Patent

CA 2586764

A process for producing tissue webs is disclosed. The process may include the step of partially dewatering a tissue web, subjecting the web to at least one deflection against a fabric, such as a coarse fabric, and then creping the web. During the process, after being dewatered, the tissue web is transferred from a transfer conveyor to the fabric using a pneumatic force, such as a suction force. In order to prevent liquids from rewetting the tissue web as the tissue web is being transferred to the fabric, the transfer conveyor is made from a material that inhibits or prevents liquids from flowing into the tissue web. For instance, in one embodiment, the transfer conveyor may comprise a felt comprised of small capillary materials. The felt may have an intake rate, for instance, of less than about 150 ~L/s when wet, may have a mean free pore size of less than about 20 microns, and may have a minimum pore size of less than about 5 microns.

L'invention concerne un procédé permettant de produire des bandes continues de tissu. Ce procédé peut consister à déshydrater partiellement une bande de tissu, à soumettre la bande à au moins une déviation contre un tissu, tel qu'un tissu grossier, puis à crêper la bande. Dans ce processus, après avoir été déshydratée, la bande de tissu est transférée d'un convoyeur de transport au tissu au moyen d'une force pneumatique, telle qu'une force d'aspiration. Afin d'empêcher que les liquides ne réhydratent la bande de tissu pendant que la bande de tissu est transférée au tissu, le convoyeur de transport est constitué d'un matériau qui inhibe ou empêche les liquides de s'écouler dans la bande de tissu. Par exemple, dans un mode de réalisation, le convoyeur de transport peut comprendre un feutre constitué de petits matériaux capillaires. Le feutre peut présenter un taux d'absorption, par exemple, inférieur à environ 150 ?L/s lorsqu'il est humide. Le feutre peut également présenter une taille de pores moyenne libre inférieure à environ 20 microns et peut présenter une taille de pores minimale inférieure à environ 5 microns.

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