Improvements in substrates incorporating security devices

Abstract

The invention therefore comprises a security substrate ( 11 ) comprising a fibrous substrate and a security device ( 10 ) The security device ( 10 ) comprises an at least partially light transmissive polymeric carrier layer bearing a first security feature and the substrate being provided with a second security feature. The first and second security features are formed and located relative to each other such that, when one side of the security substrate ( 11 ) is viewed in transmitted light the first and second security features visually combine to form a first composite image, which is not seen in reflected light.

Description

technical field [0001] The present invention is directed to the improvement of substrates, such as paper, on which security devices are mounted, and also to documents made from such substrates. Background technique [0002] As is known, a security device is provided as a security feature in or on the security paper. Such means may be chips, flakes, filaments, stripes or ribbons, eg plastic films, metal foils, metallised plastics, wires. These security devices are included in the inner layer of security paper, making it more difficult to counterfeit documents formed from such paper. This type of security device helps to verify the security document because it can make the image of the security document under reflected light different from that under transmitted light. In order to enhance the security of such devices sandwiched therein, it is also known to impart one or more verifiable properties on the device itself, above the presence or absence of such devices. Such addi...

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Problems solved by technology

But this element is manufactured separately from the paper and embedded during the paper/substrate m...

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