Board machine and method of manufacturing a multilayer...

D - Textiles – Paper – 21 – F

Patent

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D21F 11/04 (2006.01) D21F 3/04 (2006.01)

Patent

CA 2383863

A board machine for manufacturing a multilayer cardboard web (1) with a printable surface layer (2), comprising a press section (5) with at least one double-felted press (45) and a wet section (4) with a first forming unit (7) for forming a first layer (2) and one or more further forming units (8) for forming one or more further layers (3). In accordance with the invention, the first forming unit (7) forms the printable surface layer (2) and, with its forming wire, transfers the web (1), which is couched by several layers (2, 3), to the upper press felt (49) with the surface layer (2) facing downwards in the press nip to contact the lower press felt (52), which exerts a greater adhesion force on the web than the upper press felt and which encompasses the lower press roll (48) by a pre-determined minimum sector angle. The invention also relates to a method for manufacturing a multilayer cardboard web by means of such a board machine.

Cette machine à carton, servant à fabriquer une feuille continue (1) de carton multicouche possédant une couche superficielle (2) pouvant être imprimée, comprend une section de presse (5), dotée d'au moins une presse à double feutre (45), et une section humide (4), pourvue d'une première unité de formation (7) d'une première couche (2) et d'au moins une autre unité de formation (8) d'au moins une autre couche (3). Selon l'invention, la première unité de formation (7) forme la couche superficielle (2) pouvant être imprimée et, à l'aide de sa toile de formation, elle transfère la feuille continue (1) -couchée au moyen de plusieurs couches (2, 3)- vers le feutre supérieur (49), la couche superficielle (2) étant tournée vers le bas dans le pincement de la presse de manière entrer en contact avec le feutre inférieur (52), lequel exerce une plus grande force d'adhérence sur la feuille continue que le feutre supérieur et forme avec le rouleau de presse inférieur (48) un angle de section minimale déterminée. L'invention concerne également un procédé de fabrication d'un feuille continue de carton multicouche au moyen d'une telle machine à carton.

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