De La Rue International Limited

Melzer Maschinenbau Gmbh

Arndt Melzer

Matthew Charles Sugdon

Siegfried Hoffner

Simon Quainton

Thorsten Föller

The present invention relates to a method of manufacturing a security sheet comprising a security element (), a core structure () for forming the security sheet, a stack () including such a core structure (), a security sheet comprising the core structure () or stack () and a security document comprising the security sheet. At least one perforation () is formed through, from a first core surface () to a second core surface () of, at least one core layer () comprising plastic. A security element () is fed through the at least one perforation () such that the security element () extends through, from the first core surface () to the second core surface () of, the at least one core layer (). At least one first region () of the security element () is located over part of the first core surface () and at least one second region () of the security element () is located over part of the second core surface ().

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Schwelm, Germany

Arndt Melzer