CN111114168A - Compound color latent image anti-counterfeiting structure and preparation process thereof - Google Patents
Compound color latent image anti-counterfeiting structure and preparation process thereof Download PDFInfo
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- CN111114168A CN111114168A CN202010019994.7A CN202010019994A CN111114168A CN 111114168 A CN111114168 A CN 111114168A CN 202010019994 A CN202010019994 A CN 202010019994A CN 111114168 A CN111114168 A CN 111114168A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/48—Controlling the manufacturing process
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/50—Sympathetic, colour changing or similar inks
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Abstract
The invention relates to the technical field of printing anti-counterfeiting, in particular to a compound color latent image anti-counterfeiting structure and a preparation process thereof, wherein the compound color latent image anti-counterfeiting structure comprises a bottom piece, a substrate layer printed on the surface of the bottom piece through an intaglio, and an anti-counterfeiting pattern layer printed on the substrate layer through the intaglio, the substrate layer and the anti-counterfeiting pattern layer are respectively formed by sequentially and repeatedly arranging a plurality of groups of three primary color lines, each group of three primary color lines comprises three parallel lines of red, yellow and blue, the three primary color lines of the substrate layer and the three primary color lines of the anti-counterfeiting pattern layer form an angle of α, the angle is more than 0 degree and less than α and less than or equal to 90 degrees, and the application can obtain a colored latent image pattern through the superposition use of the three primary color substrate layer and the three primary color anti-counterfeiting pattern layer.
Description
Technical Field
The invention relates to the technical field of printing anti-counterfeiting, in particular to a compound color latent image anti-counterfeiting structure and a preparation process thereof.
Background
In the layout design, the angle, thickness, density, shape, etc. of some lines are changed on the base map of the regular arrangement of lines to form an implicit image, which is called a latent image. The latent image is widely applied to the anti-counterfeiting design of the plate pattern. Latent image patterns are designed from primary anti-counterfeiting common entrance tickets to advanced anti-counterfeiting bank notes. The latent image not only improves the aesthetic feeling of the layout, but also has the anti-counterfeiting function. The latent image has more patterns and the anti-counterfeiting function is strong or weak.
The latent image is mainly established by changing the shape and arrangement of lines, the creation modes are different, the appearance characteristics of the latent image are different, and the anti-counterfeiting function is different. The latent image can be realized by changing the line angle, thickness and density, and can be relief latent image, split line latent image and refraction latent image. The refraction latent image is a hidden latent image, a latent image cannot be seen in the front view, and the latent image is displayed in the oblique light view, and the blocking effect of the ink bulges on oblique light is utilized. The primary condition for achieving the refractive latent image is that the printing ink must have a certain thickness. The thicker the thick layer, the more pronounced the refractive latent image effect, since the more light the lines can block, the greater the difference in shade of color. Secondly, the lines are very thin, closely spaced and too thick, and latent images can be seen under normal conditions. The requirement of the refraction latent image on the printing process is very high, and the horizontal and longitudinal ink expansion degrees are required to be the same in the printing process, otherwise, the color density difference is generated, and the latent image can be seen under normal conditions.
However, with the common application of the existing invisible anti-counterfeiting technology, more latent image preparation methods which are easy to identify, complex to manufacture, difficult to counterfeit and better in anti-counterfeiting effect are needed.
Disclosure of Invention
The invention aims to solve the problems and provides a multicolor latent image anti-counterfeiting structure and a preparation process thereof.
The technical scheme for solving the problems is that the invention provides a multicolor latent image anti-counterfeiting structure which comprises a bottom piece, a substrate layer printed on the surface of the bottom piece through an intaglio, and an anti-counterfeiting pattern layer printed on the substrate layer through the intaglio, wherein the substrate layer and the anti-counterfeiting pattern layer are respectively formed by sequentially and repeatedly arranging a plurality of groups of three primary color lines, each group of three primary color lines comprises three parallel lines of red, yellow and blue, the three primary color lines of the substrate layer and the three primary color lines of the anti-counterfeiting pattern layer form an α angle, and the angle is more than 0 degree and less than α and less than or equal to 90 degrees.
The invention also aims to provide a preparation process of the multicolor latent image anti-counterfeiting structure, which comprises the following steps:
(1) preparing a bottom piece;
(2) preparing a base layer printing intaglio mold and an anti-counterfeiting pattern layer printing intaglio mold, wherein the base layer printing intaglio mold and the anti-counterfeiting pattern layer printing intaglio mold respectively comprise regularly trapezoidal convex parts which are arranged at intervals, inverted trapezoidal concave parts used for bearing printing ink are formed between every two adjacent convex parts, and the regular trapezoids are isosceles trapezoids with base angles of 45 degrees; the upper bottom of the convex part of the gravure mould for printing the substrate layer is 0.15-0.2mm, and the height of the convex part is 0.12-0.18 mm; the upper bottom of the convex part of the gravure mould for printing the anti-counterfeiting pattern layer is 0.08-0.12mm, and the height of the convex part is 0.06-0.1 mm;
the length of the shorter bottom edge of the concave part is not limited, the shorter the length is better, and the lower bottom of the concave part of the gravure mould for printing the base layer is preferably 0.15-0.2mm, and the lower bottom of the concave part of the gravure mould for printing the anti-counterfeiting pattern layer is preferably 0.08-0.12 mm.
(3) Base layer printing: laying the bottom piece on one surface of a gravure mould for printing the basal layer, wherein the surface is provided with a convex part and a concave part, applying pressure to the bottom piece or/and the gravure mould to form a concave part and a convex part on the surface of the bottom piece, and transferring printing ink of the concave part to the convex part of the bottom piece; sequentially printing three primary colors;
(4) and (3) printing the anti-counterfeiting pattern layer, namely, rotating the surface of the base material printed with the base layer by α degrees, laying the base material on the surface of the anti-counterfeiting pattern layer printing intaglio mold provided with the convex part and the concave part, applying pressure to the base material or/and the intaglio mold to form the concave part and the convex part on the surface of the base layer, transferring printing ink of the concave part to the convex part of the base material, and sequentially printing three primary colors.
Preferably, the printing inks of the substrate layer contain nano Cr powder, and the printing inks of the anti-counterfeiting pattern layer contain nano Al powder.
Preferably, a letterpress printing step is further included between the step (2) and the step (3): after the base layer is cured, the projections of the base layer printing gravure mold are inked, and the recesses of the base layer are printed with a transparent reverse ink.
Preferably, the printing ink of the substrate layer comprises, by mass, 7-9 parts of polyvinyl butyral, 1.5-2.5 parts of fumarated rosin ester, 9-11 parts of talcum powder, 1.5-2.5 parts of acetyl tributyl citrate, 64-68 parts of ethylene glycol and 3-5 parts of nano Cr powder.
Preferably, the printing ink of the anti-counterfeiting pattern layer comprises, by mass, 10-30 parts of ethoxylated trimethylolpropane triacrylate, 40-60 parts of urethane acrylate, 5-15 parts of acrylate, 1-10 parts of 1, 6-hexanediol diacrylate, (1-5 parts of 2, 4, 6-trimethylbenzoyl) diphenylphosphine oxide, 1-3 parts of isooctyl p-dimethylaminobenzoate, 0.01-0.5 part of silicone oil, 0.01-0.5 part of sodium dodecyl benzene sulfonate, 1-5 parts of PE wax and 10-18 parts of nano Al powder.
Preferably, the reverse ink comprises, by mass, 1 to 2 parts of TEOS, 8 to 12 parts of ethanol, and 10 to 15 parts of acrylic resin.
Preferably, the upper bottom of the convex part of the base layer printing gravure mould is 0.18mm, and the height of the convex part is 0.15mm.
Preferably, the upper bottom of the convex part of the gravure mould for printing the anti-counterfeiting pattern layer is 0.1mm, and the height of the convex part is 0.08 mm.
The invention has the beneficial effects that:
1. by the superposition of the three-primary-color substrate layer and the three-primary-color anti-counterfeiting pattern layer and the gravure printing technology, the colorful latent image pattern can be obtained, is difficult to copy and has good anti-counterfeiting effect.
2. And printing for three times to obtain a Cr-medium-Al structure composite ink layer, wherein the color of reflected light changes under observation at different angles by utilizing the interference effect of the multilayer optical ink layer, so that an anti-counterfeiting pattern with a specific color can be seen only when the anti-counterfeiting ink layer is obliquely viewed at a certain angle, and the refraction latent image effect is further improved.
3. The excellent anti-counterfeiting effect is achieved by using the double latent image effects of the pattern latent image and the color latent image.
4. Different ink layers are configured by different components, so that the fluidity, the thin consistency and the curing speed of each ink layer are different, the ink layers with different thicknesses are obtained, the color variation is improved, and the color change effect is improved.
Drawings
FIG. 1 is a schematic view of a multi-color latent image security structure viewed obliquely to light;
fig. 2 is a schematic view of a multi-color latent image anti-counterfeiting structure in a front view.
Detailed Description
The following are specific embodiments of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
Example 1
A compound color latent image anti-counterfeiting structure comprises a bottom piece, a substrate layer printed on the surface of the bottom piece through an intaglio, and an anti-counterfeiting pattern layer printed on the substrate layer through the intaglio, wherein the substrate layer and the anti-counterfeiting pattern layer are respectively formed by sequentially and repeatedly arranging a plurality of groups of three primary color lines, and each group of three primary color lines comprises three parallel lines of red, yellow and blue; the three primary color line groups of the substrate layer and the three primary color lines of the anti-counterfeiting pattern layer form an angle of 45 degrees.
The preparation process of the latent image embossing anti-counterfeiting structure comprises the following steps:
(1) preparing a bottom piece: paper with smooth surface is selected.
(2) Both of the gravure mold for base layer printing and the gravure mold for security pattern layer printing were prepared in a plate shape made of stainless steel. The two types of dies comprise regularly trapezoidal convex parts arranged at intervals, inverted trapezoidal concave parts used for bearing printing ink are formed between the adjacent convex parts, and the regular trapezoids are isosceles trapezoids with base angles of 45 degrees. The difference is that the upper bottom of the convex part of the gravure mould for printing the substrate layer is 0.18mm, the height of the convex part is 0.15mm, and the length of the lower bottom of the concave part (namely the bottom edge of the shorter end of the inverted trapezoid) is 0.18 mm; the upper bottom of the convex part of the gravure mould for printing the anti-counterfeiting pattern layer is 0.1mm, the height of the convex part is 0.08mm, and the length of the lower bottom of the concave part is 0.1 mm.
(3) Base layer printing: the base piece is clamped between an intaglio mold for printing the base layer and a foaming plate, three primary color inks are sequentially brushed on the intaglio mold, so that the concave part bears the ink and forms a three primary color line set, the convex part and other ink which is not provided with the anti-counterfeiting pattern part are scraped by a doctor blade, then the foaming plate is opened to press downwards, so that the convex part presses a concave part on the base piece, the concave part presses a convex part on the base piece, and the ink of the concave part is transferred to the convex part, so that the base pattern with concave-convex feeling is formed.
The printing ink is prepared by mixing 8 parts of polyvinyl butyral, 2 parts of fumaric acid rosin ester, 10 parts of talcum powder, 2 parts of acetyl tributyl citrate, 66 parts of ethylene glycol, 4 parts of nano Cr powder and 8 parts of tri-original toner, stirring and dispersing at 40 ℃, and grinding to the fineness of 10 mu m. The three primary colors are red, yellow and blue colors respectively, and three-color printing ink is prepared respectively.
(4) The ink was applied to the raised portions of a gravure mold for base layer printing, and the recessed portions of the base layer were printed with a transparent reverse ink obtained by mixing 1.5 parts of TEOS, 10 parts of ethanol, and 12 parts of an acrylic resin, stirring and dispersing the mixture at 37 ℃, and then grinding the mixture to a fineness of 15 μm.
(5) Printing an anti-counterfeiting pattern layer: the bottom piece is rotated by 45 degrees and then clamped between one surface, provided with a convex part and a concave part, of an intaglio mold for printing the anti-counterfeiting pattern layer and a foaming plate, three primary color inks are sequentially brushed on the intaglio mold, so that the concave part bears the ink and three primary color line groups are formed, the ink of the convex part and the ink of other parts, which are not provided with the anti-counterfeiting pattern, are scraped by a doctor blade, then the foaming plate is opened to be pressed downwards, so that the concave part is pressed on the basal layer of the bottom piece by the convex part, the convex part is pressed on the basal layer of the bottom piece by the concave part, and the ink of the concave part is transferred to the convex part, thereby forming the anti.
The absorption ink is prepared by mixing 20 parts of ethoxylated trimethylolpropane triacrylate, 50 parts of urethane acrylate, 10 parts of acrylate, 5 parts of 1, 6-hexanediol diacrylate, (3 parts of 2, 4, 6-trimethylbenzoyl) diphenylphosphine oxide, 2 parts of p-dimethylaminobenzoic acid isooctyl ester, 0.02 part of silicone oil, 0.2 part of sodium dodecyl benzene sulfonate, 3 parts of PE wax, 15 parts of nano Al powder and 25 parts of tri-original toner, stirring and dispersing at 40 ℃, and grinding to the fineness of 10 mu m. The three primary colors are red, yellow and blue colors respectively, and three-color printing ink is prepared respectively. And after printing, drying for 15min at room temperature, and drying and curing to obtain the multi-color latent image anti-counterfeiting structure.
The multi-color latent image anti-counterfeiting structure obtained in the embodiment has an excellent anti-counterfeiting effect, as shown in fig. 1 when viewed obliquely and as shown in fig. 2 when viewed frontally.
Example 2
A compound color latent image anti-counterfeiting structure comprises a bottom piece, a substrate layer printed on the surface of the bottom piece through an intaglio, and an anti-counterfeiting pattern layer printed on the substrate layer through the intaglio, wherein the substrate layer and the anti-counterfeiting pattern layer are respectively formed by sequentially and repeatedly arranging a plurality of groups of three primary color lines, and each group of three primary color lines comprises three parallel lines of red, yellow and blue; the three primary color line groups of the substrate layer and the three primary color lines of the anti-counterfeiting pattern layer form 5 degrees.
The preparation process of the latent image embossing anti-counterfeiting structure comprises the following steps:
(1) preparing a bottom piece: paper with smooth surface is selected.
(2) A gravure mold for base layer printing and a gravure mold for security pattern layer printing are prepared, and both are made of a nickel-based alloy into a plate shape. The two types of dies comprise regularly trapezoidal convex parts arranged at intervals, inverted trapezoidal concave parts used for bearing printing ink are formed between the adjacent convex parts, and the regular trapezoids are isosceles trapezoids with base angles of 45 degrees. The difference is that the upper bottom of the convex part of the gravure mould for printing the substrate layer is 0.15mm, the height of the convex part is 0.12mm, and the length of the lower bottom of the concave part (namely the bottom edge of the shorter end of the inverted trapezoid) is 0.15 mm; the upper bottom of the convex part of the gravure mould for printing the anti-counterfeiting pattern layer is 0.08mm, the height of the convex part is 0.06mm, and the length of the lower bottom of the concave part is 0.08 mm.
(3) Base layer printing: the bottom piece is clamped between an intaglio mold and a foaming plate, three primary color inks are sequentially brushed on the intaglio mold, so that the concave part bears the ink and three primary color line groups are formed, the convex part and other ink which is not provided with the anti-counterfeiting pattern part are scraped by a doctor blade, then the foaming plate is opened to press downwards, so that the convex part presses a concave part on the bottom piece, the concave part presses a convex part on the bottom piece, and the ink of the concave part is transferred to the convex part, so that a substrate pattern with concave-convex feeling is formed.
The printing ink is prepared by mixing 7 parts of polyvinyl butyral, 1.5 parts of fumaric acid rosin ester, 9 parts of talcum powder, 1.5 parts of acetyl tributyl citrate, 64 parts of ethylene glycol, 3 parts of nano Cr powder and 5 parts of tri-original toner, stirring and dispersing at 40 ℃, and grinding to the fineness of 10 mu m. The three primary colors are red, yellow and blue colors respectively, and three-color printing ink is prepared respectively.
(4) Printing an anti-counterfeiting pattern layer: the bottom piece is rotated by 5 degrees and then clamped between one surface, provided with a convex part and a concave part, of an intaglio mold for printing the anti-counterfeiting pattern layer and a foaming plate, three primary color inks are sequentially brushed on the intaglio mold, so that the concave part bears the ink and three primary color line groups are formed, the ink of the convex part and the ink of other parts, which are not provided with the anti-counterfeiting pattern, are scraped by a doctor blade, then the foaming plate is opened to be pressed downwards, so that the concave part is pressed on the basal layer of the bottom piece by the convex part, the convex part is pressed on the basal layer of the bottom piece by the concave part, and the ink of the concave part is transferred to the convex part, thereby forming the anti.
The absorbing ink is prepared by mixing 10 parts of ethoxylated trimethylolpropane triacrylate, 40 parts of urethane acrylate, 5 parts of acrylate, 1 part of 1, 6-hexanediol diacrylate, (1 part of 2, 4, 6-trimethylbenzoyl) diphenylphosphine oxide, 1 part of isooctyl p-dimethylaminobenzoate, 0.01 part of silicone oil, 0.01 part of sodium dodecyl benzene sulfonate, 1 part of PE wax, 10 parts of nano Al powder and 20 parts of tri-original toner, stirring and dispersing at 40 ℃, and grinding to the fineness of 10 mu m. The three primary colors are red, yellow and blue colors respectively, and three-color printing ink is prepared respectively. And after printing, drying for 15min at room temperature, and drying and curing to obtain the multi-color latent image anti-counterfeiting structure.
Example 3
A compound color latent image anti-counterfeiting structure comprises a bottom piece, a substrate layer printed on the surface of the bottom piece through an intaglio, and an anti-counterfeiting pattern layer printed on the substrate layer through the intaglio, wherein the substrate layer and the anti-counterfeiting pattern layer are respectively formed by sequentially and repeatedly arranging a plurality of groups of three primary color lines, and each group of three primary color lines comprises three parallel lines of red, yellow and blue; the three primary color line groups of the substrate layer and the three primary color lines of the anti-counterfeiting pattern layer form 90 degrees.
The preparation process of the latent image embossing anti-counterfeiting structure comprises the following steps:
(1) preparing a bottom piece: paper with smooth surface is selected.
(2) Both of the gravure mold for base layer printing and the gravure mold for security pattern layer printing were prepared in a plate shape made of stainless steel. The two types of dies comprise regularly trapezoidal convex parts arranged at intervals, inverted trapezoidal concave parts used for bearing printing ink are formed between the adjacent convex parts, and the regular trapezoids are isosceles trapezoids with base angles of 45 degrees. The difference is that the upper bottom of the convex part of the gravure mould for printing the substrate layer is 0.2mm, the height of the convex part is 0.18mm, and the length of the lower bottom of the concave part (namely the bottom edge of the shorter end of the inverted trapezoid) is 0.2 mm; the upper bottom of the convex part of the gravure mould for printing the anti-counterfeiting pattern layer is 0.12mm, the height of the convex part is 0.1mm, and the length of the lower bottom of the concave part is 0.12 mm.
(3) Base layer printing: the bottom piece is clamped between an intaglio mold and a foaming plate, three primary color inks are sequentially brushed on the intaglio mold, so that the concave part bears the ink and three primary color line groups are formed, the convex part and other ink which is not provided with the anti-counterfeiting pattern part are scraped by a doctor blade, then the foaming plate is opened to press downwards, so that the convex part presses a concave part on the bottom piece, the concave part presses a convex part on the bottom piece, and the ink of the concave part is transferred to the convex part, so that a substrate pattern with concave-convex feeling is formed.
The printing ink is prepared by mixing 9 parts of polyvinyl butyral, 2.5 parts of fumaric acid rosin ester, 11 parts of talcum powder, 2.5 parts of acetyl tributyl citrate, 68 parts of ethylene glycol, 5 parts of nano Cr powder and 10 parts of tri-original toner, stirring and dispersing at 40 ℃, and grinding to the fineness of 10 mu m. The three primary colors are red, yellow and blue colors respectively, and three-color printing ink is prepared respectively.
(4) The ink was applied to the raised portions of a gravure mold for base layer printing, and the recessed portions of the base layer were printed with a transparent reverse ink obtained by mixing 2 parts of TEOS, 12 parts of ethanol, and 15 parts of an acrylic resin, stirring and dispersing the mixture at 37 ℃, and then grinding the mixture to a fineness of 15 μm.
(5) Printing an anti-counterfeiting pattern layer: the bottom piece is rotated by 90 degrees and then clamped between one surface, provided with a convex part and a concave part, of an intaglio mold for printing the anti-counterfeiting pattern layer and a foaming plate, three primary color inks are sequentially brushed on the intaglio mold, so that the concave part bears the ink and three primary color line groups are formed, the ink of the convex part and the ink of other parts, which are not provided with the anti-counterfeiting pattern, are scraped by a doctor blade, then the foaming plate is opened to be pressed downwards, so that the concave part is pressed on the basal layer of the bottom piece by the convex part, the convex part is pressed on the basal layer of the bottom piece by the concave part, and the ink of the concave part is transferred to the convex part, thereby forming the anti.
The absorption ink is prepared by mixing 30 parts of ethoxylated trimethylolpropane triacrylate, 60 parts of urethane acrylate, 15 parts of acrylate, 10 parts of 1, 6-hexanediol diacrylate, (5 parts of 2, 4, 6-trimethylbenzoyl) diphenylphosphine oxide, 3 parts of p-dimethylaminobenzoic acid isooctyl ester, 0.5 part of silicone oil, 0.5 part of sodium dodecyl benzene sulfonate, 5 parts of PE wax, 18 parts of nano Al powder and 30 parts of tri-original toner, stirring and dispersing at 40 ℃, and grinding to the fineness of 10 mu m. The three primary colors are red, yellow and blue colors respectively, and three-color printing ink is prepared respectively. And after printing, drying for 15min at room temperature, and drying and curing to obtain the multi-color latent image anti-counterfeiting structure.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. A compound color latent image anti-counterfeiting structure is characterized by comprising a bottom piece, a substrate layer printed on the bottom piece through an intaglio, and an anti-counterfeiting pattern layer printed on the substrate layer through the intaglio, wherein the substrate layer and the anti-counterfeiting pattern layer are respectively formed by sequentially and repeatedly arranging a plurality of groups of three primary color lines, each group of three primary color lines comprises three red, yellow and blue parallel lines, the three primary color lines of the substrate layer and the three primary color lines of the anti-counterfeiting pattern layer form an α angle, and the angle is more than 0 degree and less than α and less than or equal to 90 degrees.
2. A process for preparing the multicolor latent image anti-counterfeiting structure according to claim 1, which is characterized in that: the method comprises the following steps:
preparing a bottom piece;
preparing a base layer printing intaglio mold and an anti-counterfeiting pattern layer printing intaglio mold, wherein the base layer printing intaglio mold and the anti-counterfeiting pattern layer printing intaglio mold respectively comprise regularly trapezoidal convex parts which are arranged at intervals, inverted trapezoidal concave parts used for bearing printing ink are formed between every two adjacent convex parts, and the regular trapezoids are isosceles trapezoids with base angles of 45 degrees; the upper bottom of the convex part of the gravure mould for printing the substrate layer is 0.15-0.2mm, and the height of the convex part is 0.12-0.18 mm; the upper bottom of the convex part of the gravure mould for printing the anti-counterfeiting pattern layer is 0.08-0.12mm, and the height of the convex part is 0.06-0.1 mm;
base layer printing: laying the bottom piece on one surface of a gravure mould for printing the basal layer, wherein the surface is provided with a convex part and a concave part, applying pressure to the bottom piece or/and the gravure mould to form a concave part and a convex part on the surface of the bottom piece, and transferring printing ink of the concave part to the convex part of the bottom piece; sequentially printing three primary colors;
and (3) printing the anti-counterfeiting pattern layer, namely, rotating the surface of the base material printed with the base layer by α degrees, laying the base material on the surface of the anti-counterfeiting pattern layer printing intaglio mold provided with the convex part and the concave part, applying pressure to the base material or/and the intaglio mold to form the concave part and the convex part on the surface of the base layer, transferring printing ink of the concave part to the convex part of the base material, and sequentially printing three primary colors.
3. The process for preparing a multicolor latent image anti-counterfeiting structure according to claim 2, which is characterized in that: the printing ink of the substrate layer contains nano Cr powder, and the printing ink of the anti-counterfeiting pattern layer contains nano Al powder.
4. The process for preparing a multicolor latent image anti-counterfeiting structure according to claim 3, which is characterized in that: a letterpress printing step is further included between the step (2) and the step (3): after the base layer is cured, the projections of the base layer printing gravure mold are inked, and the recesses of the base layer are printed with a transparent reverse ink.
5. The process for preparing a multicolor latent image anti-counterfeiting structure according to claim 3, which is characterized in that: the printing ink of the substrate layer comprises, by mass, 7-9 parts of polyvinyl butyral, 1.5-2.5 parts of fumarated rosin ester, 9-11 parts of talcum powder, 1.5-2.5 parts of acetyl tributyl citrate, 64-68 parts of ethylene glycol and 3-5 parts of nano Cr powder.
6. The process for preparing a multicolor latent image anti-counterfeiting structure according to claim 3, which is characterized in that: according to parts by mass, the printing ink of the anti-counterfeiting pattern layer comprises 10-30 parts of ethoxylated trimethylolpropane triacrylate, 40-60 parts of urethane acrylate, 5-15 parts of acrylate, 1-10 parts of 1, 6-hexanediol diacrylate, (1-5 parts of 2, 4, 6-trimethylbenzoyl) diphenylphosphine oxide, 1-3 parts of isooctyl p-dimethylaminobenzoate, 0.01-0.5 part of silicone oil, 0.01-0.5 part of sodium dodecyl benzene sulfonate, 1-5 parts of PE wax and 10-18 parts of nano Al powder.
7. The process for preparing a multicolor latent image anti-counterfeiting structure according to claim 4, which is characterized in that: the reverse ink comprises, by mass, 1-2 parts of TEOS, 8-12 parts of ethanol and 10-15 parts of acrylic resin.
8. The process for preparing a multicolor latent image anti-counterfeiting structure according to claim 2, which is characterized in that: the upper bottom of the convex part of the gravure mould for base layer printing is 0.18mm, and the height of the convex part is 0.15mm.
9. The process for preparing a multicolor latent image anti-counterfeiting structure according to claim 8, which is characterized in that: the upper bottom of the convex part of the gravure mould for printing the anti-counterfeiting pattern layer is 0.1mm, and the height of the convex part is 0.08 mm.
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