Application of anti-counterfeiting technology in p

Summarize the application of anti-counterfeiting technology in printing and packaging (6)

section III printing anti-counterfeiting technology

I. classification and technical connotation of printing anti-counterfeiting technology products

printing anti-counterfeiting technology products include: printing anti-counterfeiting marks and printing anti-counterfeiting cards

printing anti-counterfeiting technology products must have at least one of the following technical connotations:

l use anti-counterfeiting paper or anti-counterfeiting film

l use anti-counterfeiting ink

l it is made by using anti-counterfeiting printing design and anti-counterfeiting printing technology

II. Commonly used printing anti-counterfeiting technology. Methods for identifying the anti-counterfeiting characteristics of products in the laboratory

1 fluorescence function

in the general bright room, place the samples and batch samples on the non fluorescent and phosphorescent paperboard. Under the uniform illumination of D65 light source, the distance between the observer's eyes and the surface of the samples is about 300-400mm. Observe that the surface of the samples is the normal state of the products without other images. Then, turn off the light source, and irradiate with a long ultraviolet light with a wavelength of 365nm or a short ultraviolet light with a wavelength of 254nm at a distance of 20-50mm from the observation object (the set part of the sample), and the preset luminous (such as red, blue, yellow, etc.) pattern or preset part can be seen to change color. The luminous effect is determined by comparing the sample with the customer's batch sample. If the effect is consistent, it is qualified, and if it is inconsistent, it is unqualified

2 phosphorescence function

in the dark room, place the sample and customer batch sample on the fluorescent and phosphorescent paperboard. Under the uniform illumination of D65 light source, the distance between the observer's eyes and the surface of the sample is about 300-400mm. Observe that the surface of the sample is normal without other images. Then, turn off the light source, use the long ultraviolet light with a wavelength of 365nm or the short ultraviolet light with a wavelength of 254nm to test the lamp, and after being decelerated by the deceleration system at a distance of 20 from the observation object (the set part of the sample), rise and fall - 50mm through the beam of the precision lead screw, turn off the UV light source, and change the color of the preset luminous (such as red, blue, or yellow) graphics or preset parts, Under the condition that the continuous luminous time is not less than the time specified in the contract (generally not less than 30 seconds), the luminous effect is determined by comparing the sample with the customer's batch sample. If the effect is consistent, it is qualified, and if it is inconsistent, it is unqualified

3 temperature change (or thermal) function

in the general bright room, place the sample and customer batch sample on the surface of the adjustable temperature heater, and observe the color change effect of the set part of the sample. Conduct three experiments, and it is qualified if the final change color of the set part of the sample is consistent when the temperature changes

4 pressure-sensitive function

in the general bright room, the technology and management level of relevant Chinese enterprises are compared with the international level, and the samples and customer batch samples are placed on the table, such as the set position of the samples (such as adding special chemical reagents or pressure-sensitive and discolored compounds or microcapsules into the ink, colored or invisible graphics and texts printed with this ink), the friction of hard objects or tools When pressing, there is chemical pressure color change or micro limb capsule rupture dye color change (the pressure induced color has red, green, blue, purple, yellow and other colors, and the displayed color can be selected according to the user's requirements and the secret mark can be designed), it is qualified

5 water sensitivity function

in the general bright room, place the sample flat on the sample table, dip the cotton ball into the purified water, and soak it in the preset functional part. Discoloration of functional parts,; After drying, the functional part returns to its original color. After three experiments, all the results are qualified

6 the infrared anti-counterfeiting power balance can be

in the general bright room, according to the product anti-counterfeiting feature identification function description, use the infrared anti-counterfeiting discriminator to irradiate the preset functional parts, and the preset color (such as green) light spots appear. Stop irradiation and return to normal. After three experiments, all of them are qualified

7 variable light (Ovi) anti-counterfeiting function

under the condition of white light point light source or a single 365 light source from about 45 degrees, adjust the angle between the sample plane and the direction of the observer's line of sight from 90o to 45o, and observe the color change. After repeated observation for three times, if the starting color and the ending color are consistent and meet the predetermined requirements, it is qualified

8 anti counterfeiting functions such as shading, flowers, lace

under the uniform illumination of D65 light source, compare the sample with the customer batch sample with a 5x magnifying glass. If the shape, content and line smoothness meet the customer's sample, it is qualified

9 refraction latent image

belongs to a shadow technology of gravure printing. By using the tilting effect of gravure lines on light, the reflection of horizontal and vertical lines is different, and the projection of horizontal lines of gravure lines on the backlight side forms visible graphics and texts. Under the uniform illumination of D65 light source, the distance between the observer's eyes and the surface of the sample is about 300-400mm, and the surface of the sample is normal without other image shadows. Then, according to the latent image recognition design Description: intuition is that the positive direction is the conventional pattern, and the latent image cannot be seen. Change the intuitive direction and observe with side light. Due to printing (such as gravure printing) or thickened ink layer, the pattern or text hidden in the pattern can be displayed, that is, under the preset observation direction and observation angle, the preset pattern or text can be seen, and the preset part can also be observed with a 5x magnifying glass. If the observed graphics or words are consistent with the customer's batch sample, it is qualified

10 invisible image

using the variability of the depth of the lines of machine engraving plate making, the printed pattern is a graphic at first glance, and another or more images are hidden at a closer look

11 embossing anti-counterfeiting function

sample placement is the same as the appearance inspection requirements. Observe the preset position with a 5x magnifying glass, and you can see the relief effect (using the composition method of carving process, making the unique style of steel engraving of figures, buildings, utensils and so on, which is reflected in spot color lines). It should be compared with the batch sample, and whoever is consistent is qualified

12 unlocking (or moire fringe) function

sample placement is the same as that of visual inspection. Use the specified moire fringe to unlock the module, cover the preset position, and show the preset hidden moire graphics and texts through fine adjustment of direction and displacement. It is qualified if it is consistent with the batch sample

13 watermark anti-counterfeiting function

place the sample on the surface of the ground glass, set a fluorescent lamp that can be uniformly illuminated on the other side of the ground glass, turn on the light source, observe the sample, and it is required that the paper fiber organization is uniform, the watermark (different pulp fiber density is formed in the papermaking process, light transmission observation, and the designed pattern can be displayed) is clear, and the pattern shape conforms to the customer's batch sample, it is qualified

14 docking anti-counterfeiting function

the sample placement is the same as the appearance inspection requirements. Butt the two opposite cuts. If you can get the effect of continuous butt joint of shading lines and complete corresponding edge patterns, it is qualified

15 microfilm anti-counterfeiting function

microscopic observation with 40 times reading at the preset position (such as the text or pattern is reduced to within 0.25mm). If the preset text or pattern can be seen, it is qualified

16 line change anti-counterfeiting function

in the preset line change position, use 40 times the reading microscope to observe, if you can see the preset line changes smoothly from thick to thin, it is qualified

17 line splitting anti-counterfeiting function

in the preset line changing position, use 40 times the reading microscope to observe. If you can see that a certain thickness of line is split into double lines, and the fineness of the line is halved, it is qualified

18 wiring anti-counterfeiting function

in the preset wiring position, if it can be checked with a 5x magnifying glass: there are 300 enterprises with an annual production capacity of more than 10000 tons forming two colors on the same line, and the lines of the two colors have no broken seams and no overlap through direct observation, it is qualified

19 rainbow printing anti-counterfeiting function

the hue of the preset part of the sample is formed by a continuous gradient of shades, just like the rainbow in nature, which has various colors. Anyone who reaches this effect is qualified

20 back to back printing anti-counterfeiting function

after the front and back perspectives of the preset parts of the sample, the front and back images can be seen to combine to form a complete image of high-precision positioning printing (including the complementary mode of the printing pattern), it is qualified

* special note: no matter the shading, flowers, lace, latent image, changing line, splitting line, wiring, etc. are continuous lines, which can be detected under a 5x magnifying glass. If there is a point structure (indicating that it is a scanning copy), it is unqualified

special note: generally, shading, flowers, lace, latent image, changing line, splitting line, wiring, etc. are mostly spot color lines, which can be detected under a 5x magnifying glass. If there is point size color matching, or color separation overprint (which can identify the swelling and roughness on the lines and nodes), it indicates that it is photographic reproduction, it is unqualified

special note: Rainbow printing, back-to-back printing, wiring, wire splitting, embossing and latent image require special control of high investment equipment, with high anti-counterfeiting strength