Preparation method of dark-streak anti-counterfeiting paperboard

Abstract

The invention provides a preparation method of a dark-streak anti-counterfeiting paperboard. The preparation method comprises the following steps: primarily dehydrating pulp through a forming plate, then performing dehydrating through a forming net under vacuum, and carrying out squeezing and drying to obtain the dark-streak anti-counterfeiting paperboard, wherein a bottom-layer pulp net speed difference is in a range of -5 to -20 m / min during dehydration treatment of the forming net, and the forming net is provided with a dark streak structure. Compared with the prior art, the invention has the following advantages: in the dehydration forming process, the forming net provided with dark streaks is adopted for dehydration treatment, so fibers are regularly distributed according to the darkstreaks, and therefore, the surface of a paper web has a partly-hidden and partly-visible dark streak effect; an anti-counterfeiting mark is high in concealment and distinguishability, and additionalequipment is not needed for identification; the preparation method only needs to adopt conventional processes and equipment, so production cost is not increased, paper is not damaged at all, and continuous use is not affected; and the dark-streak anti-counterfeiting paperboard has the same advantages of high strength, easy degradability, repeated usability and the like as common paper.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a preparation method of dark pattern anti-counterfeiting cardboard. Background technique [0002] With the adjustment of the economic structure at the national level, the extensive business model of my country's manufacturing industry has come to an inflection point, and various industries have been under the pressure of "transformation and upgrading" to varying degrees. As one of the traditional pillar industries, the paper industry is also facing the pressure of improvement, perfection and continuous innovation. At the same time, the personalized demand of downstream customers for raw paper has also forced the paper industry to transform and upgrade, including the realization of personalized production for different customers. [0003] Adding personalized anti-counterfeiting marks on ordinary paper products is a development direction with great potential. At p...

AI Technical Summary

Problems solved by technology

Among them, fluorescent fibers or colored fibers are mostly synthetic fibers, which have poor dispersion and are likely to have an adverse effect on production; while the addition of unbleached fibers requires a long time in the production of switching between conventional paper types, resulting in loss of time and output ;The external heat source needs to be provided during thermal color detection and there may be a safety hazard of heavy metal pollution; watermarks and safety lines require equipment modification to conventional paper machines and additional huge equipment investment

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