De La Rue International Limited

Adrian Donald Ash

Malcolm Paul Baker

Duncan Hamilton Reid

Andrew Malcolm Macey

The invention is directed toward improvements in security substrates, such as paper, used for making security documents, such as bank notes, having anti-counterfeit able features and in particular to security substrates incorporating an elongate security element and methods of making the substrate. The invention comprises a security substrate for making security documents and the like comprising a fibrous base substrate and an elongate security element at least partially embedded therein. At one surface of the security substrate one portion of the security element is exposed to provide a continuous track along the length of the security element. A plurality of other portions along at least one edge of the security element are partially covered by overlapping regions of the fibrous substrate. The invention further comprises a method of manufacturing such a security substrate.

Making sheets

Paper incorporating a wide elongate impermeable element with regions at least partially exposed at one surface of the paper at two sets of windows at spaced locations has its windows formed by two sets of raised portions on the support surface of the papermaking machine. A first set of raised portions has a width transverse to the machine direction in which the paper travels during manufacture which is narrower than the width of the elongate element. A second set of raised portions has a width transverse to the machine direction which is at least equal to the width of the elongate element. During manufacture of the paper the elongate element is brought into contact with both sets of raised portions, with edges of the elongate element being supported by the second set of raised portions.

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Hampshire, United Kingdom

Adrian Donald Ash