Security paper and its manufacturing method

Abstract

The invention discloses safety paper, a safety paper manufacturing method and a movement synchronizing device for a strip material. The safety paper manufacturing method includes the steps that firstly, before fiber dispersion liquid is deposited on the surface of a mould, the strip material is attached to the surface of the mould and moves synchronously along with the mould; secondly, the fiber dispersion liquid is deposited in a strip-material area and a non-strip-material area on the surface of the mould to form wet paper sheets; thirdly, the wet paper sheets are torn off and transferred to the surface of a fourdrinier wire and are separated from the mould and the strip material, and the strip material continues moving synchronously along with the mould; fourthly, the strip materials are torn off from the surface of the mould from a preset position, and white watermarks are formed in areas, corresponding to the strip material, of the wet paper sheets. The movement synchronizing device, used in the safety paper manufacturing method, for the strip material is a drive device used for driving at least two belt wheels to drive the strip material to move synchronously along with the mould in the same direction as the mould. According to the safety paper manufacturing method, operation is convenient, production cost is reduced, production efficiency is high, and the safety paper manufactured through the method is good in anti-counterfeit effect.

Description

technical field

[0001] The invention relates to a paper and a papermaking method, in particular to a safety paper and a manufacturing method thereof. Background technique

[0002] As a traditional anti-counterfeiting technology, white watermark technology is a widely used first-line anti-counterfeiting technology. This technology has intuitive visual effects and high anti-counterfeiting performance.

[0003] White watermark paper is mainly made by a cylinder paper machine. During the papermaking process, the pulp is deposited on the surface of the cylinder. Due to the processing on a specific part of the cylinder, the drainage of this specific area is lower than that of other areas. , so that the amount of fiber deposition in this specific area is less than that in other areas, forming a local micro-thinness. After the wet paper sheet is formed, observe the white watermark paper through projected light, and it can be observed that the area with less fiber deposition has high...

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