CN105885521A - Anti-counterfeiting method based on color change of printing substrate under blue light irradiation - Google Patents

Abstract

An anti-counterfeiting method based on the color change of the printing substrate under blue light irradiation. The yellow or red functional pigment is compounded with paper, plastic film and metal sheet, so that under sunlight or white light, the color of the surface of the printing substrate is in one state, and the pigment appears red. and yellow, and under the blue light of the mobile phone screen or the blue light of ordinary colorful lights or monochromatic light or composite light with a wavelength between 400nm and 500nm, according to the specific types of red and yellow pigments, respectively The emission center wavelength is 515nm (bright green), 525nm (bright green), 530nm (bright green), 545nm (bright yellow), 555nm (bright yellow), 600nm (orange red), 610nm (orange red), 615nm (orange red ), 620nm (red), 625nm (red), 635nm (red), 655nm (red), 660nm (red) light, the composite printing substrate presents another color state, realizing the anti-counterfeiting function.

Description

An anti-counterfeiting method based on the color change of printed substrates under blue light irradiation

technical field

The invention relates to an anti-counterfeiting method based on the discoloration of a printing base material under blue light irradiation, and belongs to the field of anti-counterfeiting materials and technologies.

Background technique

UV fluorescent ink refers to the ink that under the irradiation of ultraviolet light, usually the wavelength of ultraviolet light is 254nm or 365nm, the cured printing ink layer emits red, green, yellow fluorescent ink, stop the ultraviolet light irradiation, and the fluorescence disappears. Infrared fluorescent ink refers to the ink that the printed ink layer emits green or other visible colors under the irradiation of infrared light, the commonly used infrared light wavelength is 980nm. Luminous ink refers to the ink that the printing ink layer absorbs the energy of visible light during the day and emits visible light in a dark environment. Dual-band fluorescent ink emits unique dazzling visible light under the irradiation of long-wave 365nm ultraviolet light. ) under the irradiation of one color, and emit another color under the irradiation of infrared light with a wavelength of 980nm. The functional phases of these inks are called phosphors, all of which contain rare earth metal ions, and the matrix materials can be inorganic non-metallic materials, organic small molecule materials and polymer materials. These fluorescent powders are evenly dispersed in the ink binder to prepare inks with different rheological characteristics, which are respectively suitable for various printing methods such as screen printing, gravure printing, letterpress printing, offset printing, and flexographic printing, and are used to make anti-counterfeiting Labels or anti-counterfeiting products are used for anti-counterfeiting of goods.

There is also a method similar to this patent application, by coating or full-page printing with UV-excited or infrared-excited functional inks to produce printing substrates for anti-counterfeit products such as anti-counterfeit labels, anti-counterfeit tapes, and anti-counterfeit marks, or by using ultraviolet-excited or infrared-excited functional inks. Laser-luminescent fibers and particles are dispersed in the printing substrate, and anti-counterfeiting can be achieved by displaying different colors under ultraviolet or infrared light.

These UV-excited or infrared-excited fluorescent inks and fluorescent printing substrates have an important deficiency in the manufacture of anti-counterfeit products. In anti-counterfeiting identification, a special ultraviolet light source that can emit 254nm or 365nm or an infrared light source that emits 980nm is required. Luminous ink does not require special equipment for identification, but its anti-counterfeiting ability is weak. In addition, the anti-counterfeiting industry is an industry with a height of one foot and a height of one foot. After a new anti-counterfeiting technology is applied for a period of time, counterfeit anti-counterfeiting inks and related products will gradually appear, and the novelty and anti-counterfeiting capabilities will gradually weaken. UV fluorescent inks And substrates or infrared fluorescent inks and substrates or called dual-band fluorescent inks and substrates have been used at home and abroad for more than 10 years, and lack the novel features necessary for the anti-counterfeiting industry.

Contents of the invention

Based on the above-mentioned defects related to ultraviolet fluorescent inks, infrared fluorescent inks and printing substrates or dual-band fluorescent inks and printing substrates that require special identification tools, anti-counterfeiting novelty, and weak anti-counterfeiting capabilities, this application proposes a method that is illuminated by blue light. A new anti-counterfeiting printing substrate that can change color. Blue light can be easily obtained by adjusting the light of the mobile phone screen or ordinary colorful lights, no special light sources or lamps are required.

In order to achieve the above object, the present invention adopts the following technical solutions:

The material types of printing substrates are: (1) Various papers: commonly used fragile paper, synthetic paper, coated paper, cardboard, matte paper, elegant paper, thermal paper, thermal transfer paper, laser printing paper ; (2) Plastic film: polypropylene film, polyethylene film, polyethylene terephthalate film; (3) Composite film: plastic-coated paper, various paper-plastic composite films, sub-golden aluminum foil paper, aluminized Coated paper; (4) Metal: aluminum foil, tinplate sheet, copper foil.

Use special functional pigments. Yellow pigments under white light or sunlight, according to different types of pigments, can emit central wavelengths of 515nm (bright green), 525nm (bright green), 530nm (bright green), 545nm (bright yellow), 555nm (bright yellow) under blue light irradiation. ), 600nm (orange), 610nm (orange), 615nm (orange), 620nm (red), 625nm (red), 635nm (red), 655nm (red), 660nm (red) light; white light or daylight Under the red pigment, depending on the type of pigment, it can emit light with a central wavelength of 620nm (red), 625nm (red), 635nm (red), 655nm (red), and 660nm (red) under blue light irradiation. In addition, these pigments also have the performance of emitting the above-mentioned central wavelength light corresponding to the type of pigment under the irradiation of ultraviolet light with a wavelength of 254nm or 365nm.

One of the technical solutions of the present application is: preparing the above-mentioned pigments into a coating solution or a printable ink, and the printing methods include screen printing, gravure printing, offset printing, letterpress printing, flexographic printing, and inkjet printing. The above-mentioned functional inks are coated or printed on the surface of the substrate respectively, and after drying and curing, it becomes one of the anti-counterfeiting printing substrates of this patent application. It is yellow or red under daylight or white light, but it will emit light similar to the used one under the irradiation of the blue light of the mobile phone screen or the blue light of ordinary colorful lights or monochromatic light or composite light with any wavelength between 400nm and 500nm. The light corresponding to the central wavelength of the pigment displays a color different from that of white light or sunlight, and realizes the anti-counterfeiting function. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

The second technical solution of the present application is: directly use the above-mentioned pigment particles, or combine these pigments with fibers to prepare functional composite fibers. In the papermaking process, a certain amount of pigment particles or fibers compounded with pigments are added into the pulp for blending, and the paper obtained after papermaking contains the above-mentioned pigment particles or fibers compounded with pigments. The pigment particles or fibers in the paper are yellow or red under sunlight or white light, but under the blue light of the mobile phone screen or the blue light of ordinary colorful lights or monochromatic light or composite light with any wavelength between 400nm and 500nm It will emit light of the center wavelength corresponding to the pigment used, displaying a color different from white light or sunlight, and realizing the anti-counterfeiting function. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

The third technical solution of the present application is: directly use the above-mentioned pigment particles, grind them to a suitable particle size, add a coupling agent, and melt-blend and granulate with the masterbatch of the commonly used plastic film substrate. The plastic masterbatch includes polypropylene, Polyethylene, polyethylene terephthalate, polyimide, etc., and then prepare the plastic film printing substrate according to the conventional method of plastic film. If the amount of pigment particles incorporated is small, the pigment particles and color in the plastic film substrate are almost invisible, and its appearance is consistent with that of ordinary plastic films under sunlight or white light, while the blue light of the mobile phone screen or the blue light of ordinary colorful lights Or under the irradiation of monochromatic light or composite light with any wavelength between 400nm and 500nm, it will emit light of the center wavelength corresponding to the pigment used, displaying a color different from that of white light or sunlight, and realizing the anti-counterfeiting function. If the pigment particles are added in a large amount, the yellow or red color of the pigment particles can be seen under white light or sunlight, while the blue light of the mobile phone screen or the blue light of ordinary multicolored lights or a single wavelength between 400nm and 500nm can be seen. Under the irradiation of colored light or compound light, it will emit light of the center wavelength corresponding to the pigment used, which shows a color different from that of white light or sunlight, and realizes the anti-counterfeiting function. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

The beneficial effects of adopting this patent application are: (1) UV fluorescent inks, infrared fluorescent inks and printing substrates widely used in anti-counterfeiting products, as well as so-called dual-band fluorescent inks and printing substrates require special reading machines, ultraviolet light sources and infrared light sources, is an independent machine. In addition to using the special 254nm and 365nm wavelength light for identification, the present invention can also use light with a light source wavelength of 400nm to 500nm for identification, which is a feature that other similar anti-counterfeiting methods do not have at present. The light source can be obtained by adjusting the blue light of the mobile phone screen or ordinary colorful lights. It is easy to use popular mobile phones to obtain the light source through adjustment, and there is no need to purchase new special light source equipment. (2) At present, there is no bright green, bright yellow or bright red light that passes through the blue light of the mobile phone screen or the blue light of ordinary colorful lights, or is illuminated by monochromatic light or composite light with a wavelength between 400nm and 500nm. The phenomenon of light is used in anti-counterfeiting products. The surface color of the anti-counterfeiting printing substrate is one color under white light or sunlight, and another color under blue light irradiation to realize the anti-counterfeiting function. Therefore, the technology is novel and the anti-counterfeiting ability is strong.

Description of drawings

In the accompanying drawings, Figure 1 is a schematic diagram of a printing substrate coated with a layer of functional ink on the surface of a commonly used printing substrate. 1 in Figure 1 is a commonly used printing substrate; 2 in Figure 1 is red and yellow with special functions The color-changing layer prepared by ink, the color-changing layer is red or yellow under white light or sunlight according to the color of the pigment used, while the blue light emitted by the mobile phone screen or the blue light of ordinary colorful lamps or the wavelength between 400nm Under the irradiation of monochromatic light or compound light with any wavelength from 500nm to 500nm, it emits bright green or yellow or red light corresponding to the pigment used.

In the accompanying drawings, Fig. 2 is a schematic diagram of the anti-counterfeit paper printing base material prepared by the present application, 1 in Fig. 2 is the anti-counterfeiting paper printing base material, 2 in Fig. 2 is the pigment particle embedded in the paper, and 3 in Fig. 2 is composite functional The fiber of the pigment is red or yellow according to the color of the pigment used under white light or sunlight, while the bluish light emitted by the mobile phone screen or the blue light of ordinary colorful lights or any one of wavelengths between 400nm and 500nm Under the irradiation of monochromatic light or compound light of wavelength, 2 and 3 in Fig. 2 emit bright green or yellow or red light corresponding to the pigment used.

Among the accompanying drawings, Fig. 3 is a schematic diagram of the anti-counterfeit plastic film printing base material prepared by the present application. Among Fig. The color of the pigment used is red or yellow, and it is irradiated by the bluish light emitted by the mobile phone screen or by the blue light of ordinary colorful lights or by monochromatic light or composite light with any wavelength between 400nm and 500nm , 2 in Figure 3 emits bright green or yellow or red light corresponding to the pigment used.

detailed description

Below with specific embodiment this patent application is described further.

Example 1

Use coated paper as the substrate for ordinary anti-counterfeiting labels, prepare gravure ink with yellow pigments that can emit green light with a center wavelength of 525nm under blue light, and print a layer of ink on the surface of the coated paper substrate, and it will be an anti-counterfeiting label after drying Substrate.

The surface of the substrate is yellow under white light or sunlight, while the blue light emitted by the mobile phone screen or the blue light of ordinary multi-colored lamps or monochromatic light or composite light with any wavelength between 400nm and 500nm Under irradiation, the substrate surface appears bright green. The anti-counterfeiting function is realized according to the discoloration phenomenon of the surface of the substrate under blue light. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

Example 2

Use ordinary anti-counterfeiting labels with polypropylene film as the base material, use yellow pigments that can emit red light with a center wavelength of 615nm under blue light to prepare offset printing inks, print a layer of ink on the surface of the polypropylene film, and after drying, it will be the anti-counterfeiting label base material.

The surface of the substrate is yellow under white light or sunlight, while the blue light emitted by the mobile phone screen or the blue light of ordinary multi-colored lamps or monochromatic light or composite light with any wavelength between 400nm and 500nm Under the irradiation, the surface of the substrate emits 615nm light and presents a bright red color. The anti-counterfeiting function is realized according to the discoloration phenomenon of the surface of the substrate under blue light. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

Example 3

Use three kinds of pigments that can emit green light with center wavelength of 520nm, yellow light with 555nm and red light with 615nm under blue light, and these three kinds of pigments are all yellow under sunlight or white light. The three kinds of pigments are added into the paper pulp, mixed evenly, and paper is made to obtain the anti-counterfeit printing paper base material. The paper evenly distributes yellow pigment particles in the paper under sunlight or white light, but the blue light emitted by the mobile phone screen or the blue light of ordinary colorful lights or monochromatic light with any wavelength between 400nm and 500nm or Under the irradiation of composite light, the particles in the paper emit bright green light at 520nm, bright yellow light at 555nm and red light at 615nm. The anti-counterfeiting function is realized according to the discoloration phenomenon of the yellow pigment particles on the surface of the substrate under blue light. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

Example 4

Use two pigments that can emit green light with a center wavelength of 515nm and red light with a center wavelength of 630nm under blue light. The former is yellow and the latter is red under sunlight or white light. The red pigment is compounded with the active fiber to form a functional fine and short composite fiber, and the color is red. Add yellow pigment particles and red functional composite fibers into pulp, mix evenly, and make paper to obtain anti-counterfeit printing paper substrate. The paper evenly distributes yellow pigment particles and short red fibers in the paper under sunlight or white light, but the blue light emitted by the mobile phone screen or the blue light of ordinary colorful lights or any wavelength between 400nm and 500nm Under the irradiation of monochromatic light or composite light, the particles in the paper emit bright green light at 515nm, while the red fiber emits red light at 630nm, which is different from the red light under white light or sunlight. The anti-counterfeiting function is realized according to the discoloration phenomenon of yellow pigment particles and red fibers on the surface of the substrate under blue light. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

Example 5

It can emit red light with a center wavelength of 635nm under blue light. This pigment is orange-yellow under sunlight or white light. An appropriate amount of pigment and a small amount of coupling agent are added to the polypropylene masterbatch for melt blending and granulation, and biaxially stretched to form a film, which is the anti-counterfeiting printing paper substrate. The plastic film evenly distributes tiny yellow pigment particles or yellow particles invisible to the naked eye in the paper under sunlight or white light, but the bluish light emitted by the mobile phone screen or the blue light of ordinary colorful lights or the wavelength between 400nm and 500nm Under the irradiation of monochromatic light or composite light of any wavelength, the tiny particles and particles in the plastic film emit 635nm red light. The anti-counterfeiting function is realized according to the discoloration phenomenon of the yellow pigment particles on the surface of the substrate under blue light. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

Example 6

Ordinary tinplate sheet is used as the base material, and the screen printing ink is prepared with a yellow pigment that can emit orange-red light with a center wavelength of 615nm under blue light. A layer of ink is printed on the surface of the tinplate sheet, and after drying, it becomes the anti-counterfeiting label base material.

The surface of the substrate is yellow under white light or sunlight, while the blue light emitted by the mobile phone screen or the blue light of ordinary multi-colored lamps or monochromatic light or composite light with any wavelength between 400nm and 500nm Under irradiation, the surface of the substrate presents an orange-red color at 615nm. The anti-counterfeiting function is realized according to the discoloration phenomenon of the surface of the substrate under blue light. Of course, special 254nm and 365nm wavelength ultraviolet light can also be used for identification.

Based on the above embodiments, the functional pigment proposed in this application emits green color under the irradiation of the bluish bright light of the mobile phone screen or the blue light of ordinary colorful lights or monochromatic light or composite light with any wavelength between 400nm and 500nm. , yellow, red light, and the principle of different colors under white light or sunlight, realize the anti-counterfeiting function. Combining pigments with commonly used printing substrates for anti-counterfeiting products, to achieve the same color on the surface of the printing substrate under sunlight or white light, while in the bluish bright light of the mobile phone screen or the blue light of ordinary colorful lights or the wavelength between 400nm and 500nm Under the irradiation of monochromatic light or composite light of any wavelength, the color of the surface of the printing substrate is in another state, which will not be listed here. The above embodiments are only used to illustrate and not limit the technical solution of this patent application. Those skilled in the art can understand that various changes and equivalent replacements are made to the technical solution of this patent application without departing from the principle and principles of the technical solution of this patent application. All should be included in the scope of the claims of this patent application.

Claims (7)

1., based on printing element method for anti-counterfeit of variable color under blue light illumination, it is to utilize functional pigment in blueness Light sends the method for anti-counterfeit of green, yellow and red light under irradiating, it is characterised in that divided by functional pigment Not be not combined prepare printing element with paper, plastics, metal material, printing element surface color and polish at daylight or It is a kind of color state under white light, under blue light irradiates, presents another kind of color state, thus realize anti- Pseudo-function.

Functional pigment the most according to claim 1, it is characterised in that yellow uitramarine under white light or daylight, root Different according to pigment type, can send respectively under blue light illumination centre wavelength be 515nm (bright green), 525nm (bright green), 530nm (bright green), 545nm (glassy yellow), 555nm (glassy yellow), 600nm (Fructus Citri tangerinae Red), 610nm (Chinese red), 615nm (Chinese red), 620nm (red), 625nm (red), 635nm (red), 655nm (red), the light of 660nm (red)；Red pigment under white light or daylight, root Different according to pigment type, can send respectively under blue light illumination centre wavelength be 620nm (red), 625nm (red), 635nm (red), 655nm (red), the light of 660nm (red)；In addition, These pigment have concurrently send under ultraviolet light 254nm or 365nm wavelength light irradiation corresponding with pigment type The performance of above-mentioned centre wavelength light.

Functional pigment the most according to claim 1 is compound with paper, plastics and metal material prepares printing element, It is characterized in that, the functional pigment described in claim 2 is configured to ink, by coating or full version Mode of printing prepares one layer of layer of ink being made up of functional pigment in plain paper, plastics and metallic substrate surface, Mode of printing uses silk screen printing, intaglio printing, hectographic printing, letterpress, flexographic printing, ink-jet One in printing.

Functional pigment the most according to claim 1 is compound with paper prepares printing element, it is characterised in that straight Connect and use the granules of pigments described in claim 2, or by these pigment and fiber composite, be successfully prepared Can composite fibre；In paper-making process, add a certain amount of granules of pigments or be compounded with the fiber of pigment and enter Enter in paper pulp and be blended, the paper obtained contains above-mentioned granules of pigments or be compounded with the fiber of pigment after copy paper.

Functional pigment the most according to claim 1 is compound with plastics prepares printing element, it is characterised in that straight Connect and use the granules of pigments described in claim 2, be crushed to suitable granularity, add coupling agent, With the master batch melt blending pelletize of common plastics film base material, plastic master batch includes polypropylene, polyethylene, gathers Ethylene glycol terephthalate, polyimides etc., then prepare plastic foil print by the method that plastic foil is conventional Brush base material.

Method for anti-counterfeit the most according to claim 1, it is characterised in that described printing element is at daylight or white light Under irradiation, according to raw materials used kind, present redness or yellow, and at the partially blue light of mobile phone screen or Common multi-color lamp blue light or the monochromatic light of wavelength any one wavelength in 400nm to 500nm or compound Under light irradiates, the kind according to concrete pigment is different, sends centre wavelength respectively for sending middle cardiac wave respectively A length of 515nm (bright green), 525nm (bright green), 530nm (bright green), 545nm (glassy yellow), 555nm (glassy yellow), 600nm (Chinese red), 610nm (Chinese red), 615nm (Chinese red), 620nm are (red Color), 620nm (red), 635nm (red), 655nm (red) and the light of 660nm (red), print base Material surface presents another kind of color state, this side that printing element surface color is different under blue light illumination Method application in antifalsification label, anti-counterfeit adhesive tape and anti-fake mark.

Method for anti-counterfeit the most according to claim 1, it is characterised in that described blue light is that mobile phone screen is the most blue Light or common multi-color lamp blue light or wavelength monochromatic light of any one wavelength in 400nm to 500nm Complex light.