SECURITY ELEMENT, SECURITY DOCUMENT AND METHODS OF MANUFACTURE THEREOF

摘要

A security element for a security booklet includes a plurality of pages including a first outermost page and a second outermost page. The security element includes at least one line of stitching joining the plurality of pages to one another. The stitching is formed of at least a first thread and a second thread, the first thread disposed on an outer surface of the first page, and the second thread disposed on an outer surface of the second page. The first and second threads interlock at each of a series of spaced apertures through the plurality of pages along the line of stitching. At one or more selected aperture(s), a loop of the second thread extends to the outer surface of the first page. The first thread has an optical characteristic different from the second thread, so the second thread at the selected aperture(s) is distinguishable from the first thread.