Improvements in making sheets

Details Improvements in making sheets Improvements in making sheets

D - Textiles, Paper

21

F

D21F 11/00 (2006.01) B24D 15/00 (2006.01) D21F 13/00 (2006.01) D21H 21/40 (2006.01)

Patent

CA 2718813

The invention relates to improvements in methods of making sheets for security documents having edge or corner reinforcing watermarks (13, 18) and a surface applied feature (15) and a method of making a sheet from a fibrous substrate, said sheet has corners and edges joined at said corners. The method comprises the step of forming the substrate by depositing fibres on a support surface and forming at least one reinforcing watermark (13, 18) at a predetermined position in the substrate. The reinforcing watermark (13, 18) increases the stiffness of the sheet in the watermarked region and is a positive watermark formed by varying the grammage of fibres of the substrate to form at least two adjacent bars (13a, 18a) of increased grammage relative to the mean grammage of fibres in adjacent areas of the substrate. At least one raised region (17) is formed by increasing the grammage of fibres, which joins the adjacent bars within the at least one reinforcing watermark to form a smooth planar surface. This surface is suitable for a subsequent application of a substantially planar security feature (15) to a portion of at least one surface of the substrate across the smooth planar surface.

La présente invention porte sur des perfectionnements apportés à des procédés de fabrication de feuilles pour documents de sécurité munies de filigranes de renfort de bord ou de coin et dune caractéristique appliquée en surface ainsi que sur un procédé de fabrication, à partir d'un substrat fibreux, d'une feuille munie de coins et de bords réunis au niveau des coins. Le procédé consiste à formation un substrat par dépôt de fibres sur une surface de support ; et à former au moins un filigrane de renfort en une position prédéterminée du substrat. Le filigrane de renfort augmente la rigidité de la feuille dans la région filigranée et constitue un filigrane positif formé par variation du grammage de fibres du substrat pour former au moins deux barres adjacentes de grammage accru par rapport au grammage moyen de fibres dans des zones adjacentes du substrat. Au moins une région surélevée est formée par augmentation du grammage de fibres et lie les barres adjacentes dans le ou les filigranes de renfort pour former une surface plane lisse. Cette surface est appropriée à lapplication ultérieure d'une caractéristique de sécurité sensiblement plane à une partie d'au moins une surface du substrat sur la surface plane lisse.

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