D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 27/30 (2006.01) D21F 11/08 (2006.01) D21H 21/40 (2006.01) D21H 21/42 (2006.01) D21H 21/44 (2006.01) D21H 27/32 (2006.01)
Patent
CA 2692479
The present invention relates to a process for manufacturing a sheet material, comprising at least two fibrous plies juxtaposed one on top of the other, said process comprising the following steps: a first paper ply, which includes at least one elongate region of zero thickness, is produced by filtration of an aqueous suspension of fibres on the wire of a first cylinder mould or of a former, an at least partially transparent element being inserted into said ply during the formation of said ply, and such that said at least transparent element is placed at least in said elongate region of zero thickness; a second paper ply is produced on the wire of a second cylinder mould so as to form at least one recess in said second ply; the two plies are joined together so that at least one recess in the second ply is located facing said at least one elongate region of zero thickness of the first ply comprising an at least partially transparent element; and thus a window is formed and the structure thus obtained is dried.
La présente invention concerne un procédé de fabrication d'un matériau en feuille comportant au moins deux jets fibreux juxtaposés l'un sur l'autre, ledit procédé comportant les étapes suivantes : réaliser un premier de jet de papier, comprenant au moins une zone allongée d'épaisseur nulle, par filtration d'une suspension aqueuse de fibres sur la toile d'une première forme ronde ou d'un former, un élément au moins partiellement transparent étant inséré dans ledit jet durant la formation dudit jet, et tel que ledit élément au moins partiellement transparent est disposé au moins dans ladite zone allongée d'épaisseur nulle, réaliser un second jet de papier sur la toile d'une seconde forme ronde de façon à former au moins un évidement dans ledit second jet, réunir les deux jets de sorte qu'au moins un évidement du second jet soit situé en regard de ladite au moins une zone allongée d'épaisseur nulle du premier jet comportant un élément au moins partiellement transparent et former ainsi une fenêtre, sécher la structure ainsi obtenue.
Camus Michel
Doublet Pierre
Arjowiggins Security
Robic
LandOfFree
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