Method for manufacturing a security paper
AssigneeGiesecke & Devrient GmbH
InventorsUwe Gruszczynski, Thomas Bodendieck
Life of this patent
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Abstract
The present invention relates to a method for manufacturing a security paper, for security or value documents, that exhibits at least one through opening (12) having characteristic irregularities (14) in the edge region. According to the present invention, a paper web having thin sites in the form of the outline of the desired shape of the at least one through opening (12) is formed on a paper mold, and the paper web dewatered after sheet formation, the region delimited by the thin sites being removed from the paper web by the occurring forces.
Claims18
A method for manufacturing a security paper, for security or value documents, that exhibits at least one through opening having characteristic irregularities in the edge region, characterized in that
- on a paper mold, a paper web is formed having sites, thinner than the other parts of the web, said sites being in the form of the outline of the desired shape of the at least one through opening, and
- after sheet formation, the paper web is dewatered, an inner region delimited by the sites being separated from the paper web by the occurring forces, and
- after the dewatering step, the inner region is removed from the paper web.
Dependencies are inferred from the claim text.