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Method for making latent image pattern with color changing effect by adopting silk-screen and offset printing processes

A technology of color-changing effect and offset printing process, which is applied in the field of anti-counterfeiting, can solve the problems of not being suitable for mass production, high process cost, and slow speed, and achieve the effect of good form, low process cost and fast speed

Active Publication Date: 2013-07-24
SHANGHAI BANKNOTE PRINTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this technology adopts ordinary indentation machine, although it has a good form of expression, but the speed is slow, it is not suitable for mass production
If the engraving gravure printing machine is used, although the speed is fast and the effect is good, the process cost is high

Method used

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  • Method for making latent image pattern with color changing effect by adopting silk-screen and offset printing processes
  • Method for making latent image pattern with color changing effect by adopting silk-screen and offset printing processes

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Step 1: Use OVI (red to green) ink and screen 200 mesh to print big five-pointed star pattern and eight-pointed star pattern.

[0019] The second step: Offset printing small five-pointed star and grid eight-pointed star pattern. The difference between the ink color used in offset printing and the OVI red color in the first step is DL=26.30, DC=-5.11, DH=1.96. In the final printed pattern, a large five-pointed star and a large eight-pointed star can be seen when viewed from a vertical angle. Observed at 45°, it can be seen that the original large five-pointed star also contains a small five-pointed star pattern; the original eight-pointed star pattern also contains a small grid eight-pointed star pattern.

[0020] The renderings are shown in 1 and 2. Two different pattern effects can be seen by changing the viewing angle.

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PUM

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Abstract

The invention relates to a method for making latent image patterns with a color changing effect by adopting silk-screen and offset printing processes. Ink with an optical color changing effect is used for printing a light-sensitive color changing pattern A, and common offset printing ink is used for printing a pattern B in the range of the pattern A, wherein the color difference between the pattern A and the pattern B satisfies the conditions that DL is less than or equal to 40, DC is more than or equal to negative 17 and less than or equal to 10, and DH is less than or equal to 9. The method provided by the invention has the advantages of good representation form, fast speed, good effect and low process cost.

Description

Technical field: [0001] The invention relates to the field of anti-counterfeiting technology, in particular to a method for producing latent image patterns with color-changing effects by adopting silk screen printing and offset printing techniques. Background technique: [0002] In the field of anti-counterfeiting technology, OVI ink (optical variable color anti-counterfeiting ink) is mainly used to realize pattern printing with photochromic effect. OVI ink has high requirements on thickness, and is generally printed by gravure printing or screen printing. OVI patterns generally do not use fine line printing in the design, which is related to ensuring that the pattern has a good optical change effect. Therefore it is not possible to directly apply OVI as a latent image pattern. [0003] The latent image or invisible pattern pays attention to the concealment of the pattern, regardless of whether the pattern has a color-changing effect. It is usually realized by engraving g...

Claims

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Application Information

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IPC IPC(8): B41M1/12B41M1/06
Inventor 花颖郭界吴旺宝周敏金劼沈志云陆泰伟吴亚复
Owner SHANGHAI BANKNOTE PRINTING
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