Security paper

DETAILED DESCRIPTION A security paper having optically variable devices is manufactured on a conventional Fourdrenier paper making machine having unique modifications.
These modifications allow the devices, secured on the surface of a carrier paper, to be applied to the surface of a base web during the dewatering of the base web thereby facilitating deposition of the devices at prescribed locations and intervals.
An embedment roll is employed to drive the device within the conformable fibers of the unconsolidated base web and to draw the base web fibers up into the carrier paper causing the two paper fibers to meld and adhere.
The finished paper provides evidence that the security device was incorporated during the paper making process which is extremely difficult to accomplish without access to sophistiated paper making machinery and expertise.