METHOD FOR THE SURFACE APPLICATION OF A SECURITY DEVICE TO A SUBSTRATE

摘要

A method for applying a security device (e.g., a micro-optic security thread) to a fibrous web during manufacture is provided. By way of the inventive method, the security device is preferably applied onto the fibrous web at or near a couch roll or similar tool of a paper machine when the fibrous web constitutes a sufficiently consolidated, fully formed wet web. Papers made in accordance with the inventive method, when subjected to the Circulation Simulation Test, showed minimal damage at the paper/security device interface. Moreover, the surface-applied security devices showed acceptable levels of intaglio ink adhesion, and the papers had higher cross-direction (CD) tensile strength and much less show-through on opposing sides thereof.

主权项

1. A fibrous sheet material having opposing surfaces and a recess in one opposing surface, which comprises:
a fibrous sub-region disposed beneath the recess, and an immediate adjoining bulk-region disposed next to the recess and the sub-region; a surface applied security device disposed in the recess; and an interface between the surface applied security device and the one opposing surface,wherein fibers in the sub-region are further consolidated such that the amount of fibers in the sub-region is substantially equivalent to the amount of fibers in at least the immediate adjoining bulk-region.