process when a dandy roll presses the design into the wet paper and it is made the same time with the paper. It includes fixed watermark and full-page watermark with white and black two tones. We can make the company name logo, product name or other thing into watermark and add into the paper. Security thread paper is manufactured by putting a metal wire or plastic wire in the paper  during the papermaking process .It can be divided into fully embedded security thread paper and window thread paper according to the manner of burying the safety siding. We also can add information on the thread such as the company name or product name and the color of the thread is different according to the clients' requirement.Security fiber paper includes visible fiber paper, invisible fiber paper, fluorescent dots paper and chromatographic fiber paper. This paper is made by adding colored (red, blue, yellow, green, black etc) fiber or colorless fluorescence fiber and dots into the paper pulp. The visible type is visible with naked eyes on the surface of the paper, and the invisible one is only visible under the ultraviolet rays with the colors of red, blue or yellow, etc. The fibers can be thick or thin, short or long. Fiber usually distributes in a random way, therefore the density is different in different places.