The pulp was dyed with a dye and passed through a calender roll into the paper web for secondary dyeing. The second dye can be colored by paper size press or spray. The pore structure on the surface of the pressed fiber block is closed, and dye penetration of the size press section is suppressed. The bulk fiber area is not colored at the second dyeing and still retains the color of the first dye. The voids between the bulk fibers are not pressed and the surface pore structure is opened, and the second dyeing can penetrate quickly. The monoliths are monochromatic and the fibers are overprinted. The pattern formed by the dye is better than the effect of the printing. The double-colored marking security paper has a colored background, and the fiber protruding area and the background have a color contrast. Can be used as a product with unique appearance, such as booklets, folders, greeting cards, stationery, etc.
Variable color intensity pattern security paper
The same color paper, after desizing the pretreated area, has stronger ink receptivity, the pattern hidden after dyeing has a stronger hue, and the color strength varies with the amount or mixture of desizing agents. If the pattern is visible before the paper is stained, after the paper is dyed, the color of the previous image or pattern is strengthened to form a special effect, which is called a color strength variable pattern security paper.
Color fiber security paper
In the interior of light-colored paper, colored fibers (red, green, blue) or colorless fluorescent fibers are distributed over the entire plate. The former can be seen with the naked eye on the surface of the paper, and the latter can be visualized under the irradiation of ultraviolet rays. The colors are red, blue, orange, etc. The shape can be determined according to design, and it can be thick or thin and can be long or short. The latter's security features are higher than the former.
Color-changing fiber security paper
The anti-counterfeiting characteristics of the color changeable fiber anti-counterfeiting paper are intuitive and vivid, the naked eye can distinguish, the production process is simple, and the production cost is low. The dyes and the algae fibers are added to the slurry, and the formed colored fiber paper has a special branching shape; after adding the iodine solution, discoloration will occur again. Solved the problem that colored fibers made of cotton, hemp, silk, wool, or polyester fibers are easily counterfeited and easily confused.
Staining security paper
According to the requirements of the product, the use of personalized coloring paper increases the difficulty of counterfeiting. In production, the dye and color matching process are the factors that determine the color. The more unique the color, the more difficult it is to imitate. The color can be measured by the value displayed by the instrument, making the function of the stain proof paper stronger.
