Aerodynamic method for making tissue paper

D - Textiles – Paper – 21 – F

Patent

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D21F 9/00 (2006.01) D21F 11/00 (2006.01) D21F 11/14 (2006.01)

Patent

CA 2350479

An aerodynamic method of making tissue paper comprises the steps of preparing an aerosuspension out of cellulose fibers, forming a layer of fibers (8) on a forming wire (7), moistening the formed layer of fibers and pressing and drying of said formed layer. The step of moistening the layer of fibers is performed concurrently with the step of pressing, for which purpose the layer of fibers is placed between the profiling (3) and moistening (4) belts. The surface of the profiling belt (3) comprises protruding elements (14), wherein a distance between two mutually-adjacent protruding elements doesn't exceed an average length of the fibers. A wire with smoothed nodes (14) of interweaving threads can be used as the profiling belt, while fine-mesh wire can be used as a moistening belt. Selective moistening of fibers only in the areas being pressed eliminates moistening of the entire layer, and drying of the paper web requires significantly less expenditures of time and energy. Shrinkage of the paper web is also minimized because the non-pressed areas of fibrous layer don't practically get moistened.

L'invention concerne un procédé aérodynamique permettant de fabriquer du papier de soie. Ce procédé consiste à préparer un toile de formation, à humidifier la couche de fibres obtenue puis à comprimer et sécher cette couche de fibres. Etant donné que l'humidification de la couche de fibres se fait en même temps que la compression, la couche de fibres est située entre les courroies de profilage et d'humidification. La surface de la courroie de profilage comprend des éléments saillants séparés entre eux par une distance ne dépasse pas la longueur moyenne des fibres. Une bande pourvue de noeuds lisses constitués de fils entrelacés peut servir de courroie de profilage, tandis qu'une bande à mailles fines peut servir de courroie d'humidification. L'humidification sélective des fibres réalisée uniquement sur les zones en cours de compression permet d'éviter l'humidification de toute la couche tandis que le séchage de la bande de papier demande sensiblement moins de temps et d'énergie. Grâce à ce procédé, les zones de la couche fibreuse qui ne sont pas comprimées ne sont pratiquement pas humidifiées, ce qui permet de minimiser le rétrécissement de la bande de papier.

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