Paper forming die, die manufacturing method and paper manufactured by forming die

Abstract

The invention discloses a paper forming die. The paper forming die comprises a roller; a plurality of penetrating micropores are arranged in the roller wall of the roller, and one or more pattern characters in common watermarks, white watermarks, safety line windowing zebra grids and paper marking marks are engraved on the roller wall of the roller. According to the paper forming die disclosed bythe invention, an original watermark design draft is highly reducible, and the consistency, the definition, the three-dimensional sense, the fineness and the richness of details of the watermark in the paper are improved, so that the anti-counterfeiting function of the watermark paper is enhanced; the service life of the paper forming die is prolonged; and the manufacturing automation level of thepaper forming die is improved, and the labor intensity of workers is greatly relieved.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting printing, in particular to a paper forming mold, a method for making the forming mold and paper. Background technique [0002] The existing paper forming process is mainly to design the watermark artwork first, then carry out the engraving of the watermark plate and the production of multi-layer watermark copper mesh, and finally fit the watermark copper mesh on the stretchable skeleton to obtain the watermark mesh used for watermark paper copying cage. [0003] There are following defects in the manufacturing process of existing paper forming molds: [0004] (1) The reducibility of the watermark artwork is lost during revision. During the engraving process of the watermark plate, the watermark plate revision personnel must modify the corresponding areas and parts of the watermark plate to varying degrees according to the copper wire breakage after the watermark pressure test, and th...

AI Technical Summary

Problems solved by technology

[0004] (1) The restoration of the watermark artwork is lost during revision

During the engraving process of the watermark plate, the watermark plate revision personnel must modify the corresponding areas and parts of the watermark plate to varying degrees according to the copper wire breakage after the watermark pressure test, and there will be some differences between the watermark plate after trimming and the original design artwork , which reduces the reducibility of the watermark artwork

[0005] (2) The reducibility of the watermark artwork will be further lost when the watermark is suppressed

When the watermark plate is pressed on the copper surface, due to the certain elasticity of the copper mesh, after the pressure of the hydraulic press releases the watermark plate, the pressed watermark will rebound to varying degrees, causing the watermark pattern to restore the watermark artwork. secondary loss of sex

[0006] (3) The upper and lower plates are pressed, so the refinement and miniaturization of the watermark cannot be achieved

For fine, micro, sharp patterns and lines, it is easy to produce broken copper wires or even holes when pressing watermarks, resulting in large discontinuities in patterns and lines, and easy to produce dew and hanging pulp during the paper copying process Phenomena and effects on watermark integrity

The existing watermark pressing process cannot solve the contradiction between watermark refinement, miniaturization and copper wire breakage

[0007] (4) The positioning accuracy of watermarks (including ordinary watermarks and white watermarks), window zebras, and width markers fluctuate greatly

During this process, cage quality problems are prone to occur, and it is often necessary to stop the machine for manual processing, resulting in more times of starting and stopping the paper machine, affecting the production efficiency and production volume of the paper machine, and increasing the operating cost of the paper machine process

[0009] (6) During the operation of the cage, due to the factors of the cage skeleton, it will affect the quality indicators such as the smoothness and circumference of the cage surface

[0010] (7) The consistency of the watermark cannot be guaranteed, and online detection is difficult

The above factors cannot guarantee the consistency of the watermark, and also bring great difficulty to the online detection of the network watermark

[0011] (8) The service life of the mesh cage is short

The surface net of the cage is made of copper material, which has poor wear resistance. During the operation of the cage in the mesh groove of the paper machine, it is easy to be partially worn out, and it cannot be repaired manually. The cage is forced to go off the machine. This situation not only affects the The quality of paper watermarking and copying efficiency, and will increase the production cost of paper copying

[0012] (9) The manual labor intensity in the cage production process is high, there are many quality risk points in the processing process, and the process control is difficult

At present, for the production of ordinary watermarks, the diaphragms for making white watermarks or frame markers need to be made separately, and then pasted on the outer surface of the watermark cage after the production is completed. The surface treatment and bonding of the diaphragms are done manually. quite a lot of work

Moreover, the mesh cage production process includes multiple links such as watermark plate production, plate revision, diaphragm production, and mesh cage installation. There are many quality risk points, and it is difficult to control the quality of the process.

Images