Web former for a paper machine

Details Web former for a paper machine Web former for a paper machine

D - Textiles, Paper

21

F

D21F 9/00 (2006.01) D21F 1/48 (2006.01)

Patent

CA 2087043

The invention concerns a twin-wire web former for a paper machine, whose wires (10,20) form a twin-wire forming zone (V1-V2) between them, on which zone water is drained out of the web (W) through both of said wires (10,20). After the twin-wire zone the web (W) is separated from the covering wire (20) and is transferred on the carrying wire (10) to its pick-up point. In hybrid formers (Fig. 1), after the single-wire forming zone (10a), and in gap formers (Fig. 2), after the curved forming zone (a0) placed directly after the forming gap (G), there is a forming shoe (30;30A) provided with a ribbed deck (31) and fitted inside one of the wire loops (10/20). This forming shoe (30;30A) is followed by dewatering and web forming units which include forming ribs and are placed inside both of the wire loops (10,20), of which units at least one is loaded by means of a pressure-hose arrangement.

L'invention porte sur un formeur à double toile pour une machine à papier dont les toiles métalliques (10,20) forment entre elles une zone de formation à deux toiles (V1-V2) dans laquelle la bande de papier (W) est égouttée à travers lesdites toiles métalliques (10,20). Après la zone à deux toiles, la bande de papier (W) est séparée de la toile de couverture (20) et est tranférée sur la toile porteuse (10) à son point de réception. Dans les formeurs hybrides (fig. 1), après la zone de formation à toile simple (10a), et dans les formeurs à intervalle (fig. 2), après la zone de formation incurvée (a0) placée directement après l'intervalle de formation (G), il y a un sabot de formation (30;30A) comportant une surface nervurée (31) et inséré dans l'une des boucles de toile (10/20). Ce sabot de formation (30;30A) est suivi d'unités d'égouttage et de formation de la bande de papier qui comprennent des nervures de formation et sont placées à l'intérieur des deux boucles de toile (10,20), desquelles unités au moins une est chargée au moyen d'un dispositif à boyau sous pression.

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