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Improvements in security documents

A safe document and security technology, applied in printing, information-carrying cards, printed matter, etc., can solve the problems of reducing the strength of documents and increasing the cost of substrate materials

Inactive Publication Date: 2011-08-24
DE LA RUE INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] A disadvantage of a watermark applied across the entire banknote is that it increases the material cost of the substrate because the denser parts of the watermark contain more fibers and / or reduces the strength of the document because the lighter areas of the watermark represent weak spots
These issues are insignificant for moderately localized watermarks, but become significant in the case of global watermarks

Method used

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  • Improvements in security documents
  • Improvements in security documents
  • Improvements in security documents

Examples

Experimental program
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Embodiment Construction

[0029] refer to figure 1 , which shows a security document 10 according to the invention made of a substrate such as paper. The substrate is preferably made using a cylinder paper machine as described above. Many security documents have conventional multi-tone watermarks 11 of the type described above, which can be seen in transmitted light.

[0030] A paper machine cage includes a cage wire that provides a support surface on which a substrate is formed. The cage screen generally consists of four layers of wire mesh (cloth), usually made of phosphor bronze, the outer two layers of which are embossed to form any desired watermarks 11 in the substrate. The outermost layer on which the substrate fibers are deposited, thus forming the substrate, is known as the face cloth and typically has a screen size of 27 warp yarns per centimeter by 18 weft yarns per centimeter (27 / 18). Figure 2a with Figure 2b Sections of two different configurations of wire mesh are shown for the oute...

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PUM

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Abstract

The invention relates to improvements in security documents, and a method for making such security documents. The security document made from a fibrous security substrate comprising at least one watermark and a background wiremark pattern. At least one of the said watermark or watermarks comprises at least one machine detectable pattern and, the at least one machine detectable pattern comprises a series of regularly repeating elements in which the pitch of the elements of the pattern is selected to be different from that of the background wiremark pattern formed in the substrate and lies in the range of (5) to (100) elements per cm.

Description

technical field [0001] The present invention relates to improvements in security documents and methods for producing such security documents. Background technique [0002] Valuable securities and identification tools, such as banknotes, passports, ID cards, certificates, etc., have the disadvantage of being easy to copy or forge. The increasing availability of color photocopying, electronic scanning and other imaging systems, and the improved technical quality of color photocopying have led to an increase in the falsification of these documents. There is therefore a constant need to improve the security features of these files to incorporate additional security features or to increase the perception and resistance to imitating existing features. [0003] Steps have been taken to introduce variable optical features into these documents that cannot be reproduced by photocopiers or electronic scanners. Since the photocopying process often involves reflecting high-energy light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D15/00
CPCB42D25/29B42D15/0026B42D15/0013B42D25/355B42D15/004
Inventor P·豪兰
Owner DE LA RUE INT LTD