Method for producing a watermark element, watermark element,...

Details Method for producing a watermark element, watermark element,... Method for producing a watermark element, watermark element,...

D - Textiles, Paper

21

F

D21F 1/44 (2006.01) D21H 21/40 (2006.01)

Patent

CA 2737578

According to one aspect, the invention relates to a method for producing a watermark element (10) for forming a shadow watermark image in a substrate by means of dewatering of a fibrous suspension, wherein the watermark element (10) comprises a body with a relief side (12) having a relief (14) and a dewatering side (16) positioned opposite the relief side, perforations (18) being provided at least in the relief (14), a perforation (18) comprising a channel (20) with a channel inlet (21) at the relief side (12) and a channel outlet (22) at the dewatering side (16), which method includes the steps of forming perforations in a body in a mechanical manner and introducing a relief in the intended relief side, the perforations (18) being formed in such a way that the dewatering capacity, expressed as the open surface area of the channel inlet(s) per unit of surface area of the relief, is dependent on the height (h) of the channel inlet (21) with respect to the dewatering side (16), it being the case that the higher the height, the lower the dewatering capacity.

L'invention concerne selon l'un de ses aspects une méthode de production d'un élément de filigrane (10) permettant de former une image fantôme de filigrane dans un substrat par déshydratation d'une suspension fibreuse. Le corps de l'élément de filigrane (10) comporte une face (12) présentant un relief (14) et une face de déshydratation (16) lui étant opposée. Des perforations (18) sont faites au moins dans le relief (14), chaque perforation (18) comprenant un canal (20) présentant une entrée (21) sur la face (12) et une sortie (22) sur la face (16). Ladite méthode consiste à effectuer mécaniquement les perforations et à introduire un relief sur la face (12). Les perforations (18) sont faites pour que la capacité de déshydratation exprimée en tant que rapport entre la surface de l'entrée d'un canal et une unité de surface du relief, dépende de la hauteur (h) séparant l'entrée du canal de la face (16), la capacité de déshydratation étant d'autant plus faible que la hauteur est importante.

Affiliated with

Also associated with

Rating

Method for producing a watermark element, watermark element,... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for producing a watermark element, watermark element,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing a watermark element, watermark element,... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1404183