This security paper is made by adding fiber yarns or color dots to pulp during papermaking. The earliest form of this anti-counterfeiting paper is the addition of colored plant fibers in the pulp, which are commonly used in the following forms:
1 Add colored chemical fiber or fluorescent fiber to the pulp. The former is seen on the surface of the paper with the naked eye, and the latter must be visible under the irradiation of ultraviolet light. The color is mostly red, blue, orange, and the shape can be thick. Fine, long or short.
2 In the process of papermaking, metal wires, plastic wires coated with metal films on the surface, wires with fluorescence, films coated with optically variable materials, or magnetic materials are inserted into the paper layer. Such wires are difficult to reproduce in the copying process. Therefore, it is widely used as an effective anti-counterfeit measure.
(3) A material having an optically variable function (e.g., fluorescence, luminescence, or discoloration), typically a plastic film or a metal foil, is made into a shape such as a circular or polygonal small piece dispersed in a paper layer; Can be identified, and copiers are difficult to reproduce.
