CN114179542B - Laser digital spray printing method - Google Patents
Laser digital spray printing method Download PDFInfo
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- CN114179542B CN114179542B CN202111671840.7A CN202111671840A CN114179542B CN 114179542 B CN114179542 B CN 114179542B CN 202111671840 A CN202111671840 A CN 202111671840A CN 114179542 B CN114179542 B CN 114179542B
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- laser
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0023—Digital printing methods characterised by the inks used
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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
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/322—Pigment inks
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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
- C09D11/30—Inkjet printing inks
- C09D11/36—Inkjet printing inks based on non-aqueous solvents
Abstract
The invention discloses a laser digital spray printing method, which comprises a packaging printing stock and a transparent plastic packaging film packaged on the surface of the packaging printing stock, wherein female anti-counterfeiting layer dots are arranged on the surface of the packaging printing stock, male decoding layer dots corresponding to the positions of the female anti-counterfeiting layer dots are arranged on the surface of the transparent plastic packaging film, the female anti-counterfeiting layer dots are hidden pattern characters, and the male decoding layer dots are hidden with corresponding patterns of the pattern characters. The female anti-counterfeiting layer mesh point and the male decoding layer mesh point are extremely shallow, the original design file cannot be copied by the copy at all, and the anti-counterfeiting performance is extremely high; compared with printing dots, the three-dimensional hemispherical dots have stronger third dimension, and particularly when the latent image pattern is manufactured, the 3D shape of the dots forms the three-dimensional latent image pattern through reflection of light with different angles, so that the anti-counterfeiting effect is better.
Description
Technical Field
The invention relates to a laser digital spray printing method, and belongs to the technical field of laser digital spray printing.
Background
When sunlight passes through the triple prism, a color light band effect is generated, which is caused by the difference of different refractive indexes of different wavelengths of colored light, and in actual production and life, the printed matter surface is deliberately made to show the effect by a process, which is commonly called laser printing. The application of the laser effect on packaging printed matters is more and more common, and most laser processes are realized by adopting a laser stamping transfer process at present. The process comprises the steps of prefabricating a laser nickel plate by a laser processing technology, then splicing the laser nickel plate to obtain a required processing breadth, rolling and stamping to obtain an OPP laser transfer film, enabling the surface of the transfer film to be fully covered with regular holographic patterns under the action of pressure, enabling the holographic patterns to be composed of a plurality of net holes similar to a triple prism structure, enabling the holographic patterns to be expressed as a texture structure under the observation of a high magnification magnifying glass, enabling part of UV oil to be transferred into net holes on the surface of the laser transfer film under the action of pressure of laser stamping transfer equipment when a printing product coated with the UV oil is compounded with the laser transfer film, enabling the UV oil in the net holes and the residual UV oil on the surface of the printing product to be instantly solidified by ultraviolet light transmitted through the laser transfer film, and finally enabling the printing product and the laser transfer film to be quickly peeled off through a peeling mechanism of the laser stamping transfer equipment, and enabling the UV oil coated on the surface of the printing product to form a plurality of net holes complementary to the holographic patterns of the laser transfer film. When we observe the print, we can see a colorful holographic pattern on the surface of the print coated with UV varnish.
The existing laser transfer process needs laser plate making, plate splicing, laser film pressing, laser film embossing transfer and other processes, and the processes are relatively large, so that environmental pollution is easily caused for plate making, film making and the like. The holes on the laser nickel plate and the laser transfer film are extremely fine, and the laser nickel plate and the laser transfer film are damaged once being collided or fallen into dust, so that the laser nickel plate and the laser transfer film are heavy and have larger loss. The pattern characters can not be adjusted any more in the manufacturing process, and the application limit is larger.
Disclosure of Invention
The invention aims to solve the technical problems that: a laser digital jet printing method is provided to solve the problems in the prior art.
The technical scheme adopted by the invention is as follows: a laser digital jet printing method comprises the following steps:
(1) The special digital jet printer unit is selected, is a single Zhang Duikai format unit and comprises two units, namely a first jet printer unit and a second jet printer unit;
(2) Preparing special laser jet printing ink;
(3) Inputting manuscripts to be processed into a central processing platform of a digital jet printer, and performing graphic and text pre-printing processing to form a working instruction;
(4) The central processing platform sends working instructions to a first nozzle unit and a paper conveying unit of a first jet printing unit, a paper conveying unit synchronously conveys paper to the jet printing unit, a first unit nozzle is used for spraying special laser jet printing ink on the surface of a printed matter, and the jet printing unit is used for instantly drying and solidifying a jet printing text to obtain a planar image-text while finishing the jet printing of the printed matter;
(5) The central processing platform synchronously sends instructions to the second jet printing unit, the second nozzle unit of the second jet printing unit carries out local UV transparent varnish jet printing on the position of the image and text which is just solidified on the surface of the printed matter, and instant drying and solidification are carried out on the image and text through the ultraviolet drying unit;
(6) And collecting and finishing the printed products after the spray printing by a paper collecting unit.
Preferably, the nozzles used in the first nozzle unit and the second nozzle unit are of a light management GN5/6 series, the resolution is 600dpi, the liquid drop quantity is 7-21pl, the spraying frequency is 50hz, and the normal processing speed is 4000-4500P/H.
Preferably, the special laser jet printing ink comprises the following components in parts by weight: 45-57% of acrylic resin binder, 0.1-1% of phosphite ester, 5-10% of dimethyl mixed diacid, 18-25% of laser pigment, 0.3-2% of photoinitiator and 1-5% of ethylene glycol monobutyl ether.
Preferably, the laser pigment is formed by vacuum evaporation of a high-purity aluminum layer on the surface of a film to form an aluminum plating film, then pressing a laser mould pressing plate on the surface of the aluminum plating film at 125 ℃, then placing the aluminum plating film in an organic solvent to strip the film to obtain a laser aluminum foil, crushing the laser aluminum foil to obtain laser powder, and dissolving the laser powder in a connecting material to form the laser metal pigment.
Preferably, the particle size of the laser pigment is 1-10um.
Preferably, the spray printing in the step 5 is local screen printing, and the spray printing position is according to a preset image-text.
Preferably, the height of the ink layer of the spray printing pattern in the step 5 is 0.2 plus or minus 0.05mm, which is a regular screening grid, and the transparent net hole structure similar to a triangular prism structure is required to be formed on the surface of the product after the process is finished.
The invention has the beneficial effects that: compared with the prior art, the invention can directly realize the laser effect of the digital jet printing product through the matched application of the special digital jet printing equipment and the special laser jet printing ink. It has the following advantages:
1. the final structure and laser effect of the spray-printed print are basically consistent with those of the laser film formed by pressure transfer, but the invention saves the procedures of manufacturing nickel plates and laser films and processing the films, and does not pollute the environment;
2. when the special UV laser jet printing ink is manufactured, the laser plate is adopted for imprinting, and the pigment of the special UV laser jet printing ink needs to be crushed into powder of 1-10 mu m, so that the requirement on the layout of the laser plate is not high, and the same plate can be used for a plurality of times;
3. the ultra-strong error correction capability, the printing content can be adjusted on line according to the design requirement, and the on-demand printing is realized;
4. the printed matter is very difficult to copy by scanning and copying, and has a certain anti-counterfeiting effect.
Drawings
Fig. 1 is a schematic diagram of a jet printing apparatus.
Fig. 2 is a schematic diagram of a laser digital jet printing structure.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples.
Example 1: as shown in fig. 1-2, in a laser digital spray printing method, a plurality of groups of digital spray heads are used for online spray printing, and the spray printing of a first spray printing unit is used for realizing the picture and text spray printing with a uniform plane bottom effect. And when the digital spray head of the second spray printing unit is used for spray printing, the position of the spray head is controlled by a program, the position and the shape of the spray printing image and text are selectively sprayed, and the numerical value of the ink drop quantity is controlled by the program to adjust the thickness of the ink layer, so that the ink drop can form a pagoda line with a small upper part and a large lower part under the double functions of gravity and surface tension on the surface of a printed product. The second jet printing unit carries out local UV varnish jet printing on the base color of the mirror surface, the thickness of the printing ink of the UV varnish layer is 0.2+/-0.05 mm, the UV varnish layer is a transparent grating net wire with the specification, the second jet printing unit just plays a role of a triple prism, and the product has a gorgeous laser effect from any angle. Because the CPU can directly instruct the digital spray head to operate, the spray-printed pattern text content and ink layer thickness can be adjusted on line according to the requirements, and the on-demand printing is truly realized. The technical method does not need to use a laser method to manufacture nickel plates, stamping laser films and the like, is very green and environment-friendly, and the laser digital spray printing method comprises the following specific steps:
1. the special digital jet printer unit is selected, and the digital jet printer unit used in the scheme is a single Zhang Duikai format and comprises a central processing platform 1, a paper conveying unit 2, a first jet printer unit 3, a first spray head unit 3-1, an ultraviolet drying unit 4, a second jet printer unit 5, a second spray head unit 5-1, an ultraviolet drying unit 6 and a paper collecting unit 7; the spray head used in the invention is a light-regulating GN5/6 series, the resolution is 600dpi, the liquid drop quantity is 7-21pl, the spraying frequency is 50hz, and the normal processing speed is 4000-4500P/H.
2. The special laser jet printing ink is prepared with the main materials including acrylic resin material 45-57 wt%, phosphite ester 0.1-1 wt%, mixed dimethyl diacid 5-10 wt%, laser pigment 18-25 wt%, photoinitiator 0.3-2 wt% and glycol monobutyl ether 1-5 wt%. The laser pigment is formed by vacuum evaporating a high-purity aluminum layer on the surface of a film to form an aluminum plating film, pressing a laser mould pressing plate on the surface of the aluminum plating film at 125 ℃, then placing the aluminum plating film in an organic solvent to strip the film to obtain a laser aluminum foil, crushing the laser aluminum foil to obtain laser powder, and dissolving the laser powder into a connecting material to form the laser metal pigment, wherein the particle size of the laser pigment is 1-10 mu m.
3. Inputting manuscripts to be processed into a central processing platform 1 of a digital jet printer, and performing graphic and text pre-printing processing to form a working instruction;
4. the central processing platform 1 sends working instructions to the first spray head unit 3-1 and the paper conveying unit 2 of the first spray printing unit 3, the paper conveying unit synchronously conveys paper into the spray printing unit 3, the first unit spray head 3-1 sprays printing ink on the surface of a printed matter by using special laser, and when the printing is finished, the spray printing text is instantly dried and solidified by the ultraviolet drying unit 4 on the digital spray printing unit, so that a plane image and text is obtained. Preferably, the special laser jet printing ink in the step 2 is adopted in the jet printing unit, so that full-plate full-image-text jet printing is adopted, the ink layer of the printed matter is a plane with uniform height, and the pattern characters sprayed by adopting the special laser jet printing ink show diffuse reflection metal texture.
5. The central processing platform 1 synchronously sends instructions to the second jet printing unit 5, the second nozzle unit 5-1 of the second jet printing unit carries out local UV transparent varnish jet printing on the position of the image and text which is just solidified on the surface of the printed matter, and instant drying and solidification are carried out on the image and text through the ultraviolet drying unit 4. The spray printing is local screen printing, and the spray printing position is according to the preset image and text. The spray printing in the process needs to control the quantity of liquid drops of a spray head to 7-21pl, ensures that the height of an ink layer of the spray printing picture in the step after the spray painting is finished is 0.2+/-0.05 mm, is a regular screening grid, and requires to form a transparent net hole structure similar to a triangular prism structure on the surface of a product after the process is finished. Preferably, the step adopts UV transparent varnish (the common jet printing UV varnish ink can meet the requirements).
6. The printed matter after spray printing is collected and tidied by the paper collecting unit 7 so as to be convenient for the next working procedure to process left and right.
At this time, the printed matter is shown in fig. 2, and the structures of the printed matter are a printing layer 1, a laser spray printing layer 2 and a UV transparent line layer 3 respectively. Because the laser jet printing ink used for the planar graphics context jet printed by the first jet printing unit 3 makes the surface of a printed product show a mirror diffuse reflection effect, the transparent UV gloss oil jet printed by the second jet printing unit 5 only jets regular sharp lines with the height of 0.20mm, and the transparent three-dimensional grid net lines are obtained, which form net holes with countless specifications on a printing plane (the surface of a product after the second jet printing is actually an uneven regular plane under the observation of a high-power magnifying glass). When the angle of the line of sight changes, the incident light rays are reflected, refracted, interfered and other physical phenomena through the transparent grid layer, so that an observer can see colorful laser effect on the surface of the printed product.
Specific application example 1: the digital jet printer unit jet prints the paper width of the printed matter to be 745 mm, the actual jet printing plate area to be 729 mm 560 mm, the nozzle unit adopts two groups of light-regulating GEN5UV nozzles, the resolution is 600dpi, the drop quantity is 15pl, the jet frequency is 50hz, and the processing speed is 3500P/H. The ultraviolet drying units are respectively two 16kwUV lamps.
The laser jet printing ink adopted is: taking 0.9kg of 1-6-hexanediol acrylic ester, 0.9kg of trimethylolpropane triacrylate, 0.72kg of 2-hydroxyethyl methacrylate phosphate, 0.9kg of aromatic polyurethane methyl acrylate and 0.6kg of mixed dimethyl diacid, putting into a container, uniformly stirring, taking 1.5kg of laser pigment, 0.12kg of photoinitiator and 0.06kg of phosphite ester, adding and stirring at a high speed for 30 minutes for later use.
The printed matter passes through a digital jet printer, the first unit of the digital jet printer carries out jet printing of trademark characters, the speed is 3500 pieces/hour, and two 16kwUV lamps are turned on at 50% power. The second machine set of the digital jet printer then carries out jet printing of transparent UV lines, and two 16kwUV lamps are turned on at 50% power. Through detection, the product is dried and cured firmly. The average height of the actually measured transparent UV lines is 0.21mm, and the laser effect basically meets the requirement.
Specific application example 2: the digital jet printer unit jet prints the paper width of the printed matter with 725 x 510mm, the actual jet printing plate area with 709 x 480 mm, the nozzle unit adopts two groups of light-regulating GEN5UV nozzles, the resolution is 600dpi, the drop quantity is 18pl, the jet frequency is 50hz, and the processing speed is 4000P/H. The ultraviolet drying units are respectively two 16kwUV lamps.
The laser jet printing ink adopted is: taking 6kg of 1-6-hexanediol acrylic ester, 6kg of tri-hydroxy methyl propane triacrylate, 4.8kg of 2-hydroxy ethyl methacrylic acid phosphate, 6kg of aromatic polyurethane methyl acrylate, 4kg of mixed dimethyl diacid, putting into a container, uniformly stirring, taking 10kg of laser pigment, 0.8kg of photoinitiator and 0.4kg of phosphite ester, adding and stirring at a high speed for 30 minutes for later use.
The printed matter passes through the digital jet printer, the first machine set of the digital jet printer carries out the jet printing of trademark characters, the speed of the vehicle is 4000 sheets/hour, and two 16kwUV lamps are started with 80% power. The second machine set of the digital jet printer then carries out jet printing of transparent UV lines, and two 16kwUV lamps are powered on by 80%. Through detection, the product is thoroughly dried and is firmly solidified. The height of the actually measured transparent UV line is 0.23mm, and the laser effect is good.
Specific application example 3: the digital jet printer unit jet prints the paper width of the printed matter at 710 x 490mm, the actual jet printing plate area at 690 x 470 mm, the nozzle unit adopts two groups of light GEN5UV nozzles, the resolution is 600dpi, the drop quantity is 21pl, the jet frequency is 50hz, and the processing speed is 3800P/H. The ultraviolet drying units are respectively two 16kwUV lamps.
The laser jet printing ink adopted is: taking 12kg of 1-6-hexanediol acrylic ester, 12kg of trimethylolpropane triacrylate, 9.6kg of 2-hydroxyethyl methacrylate phosphate, 12kg of aromatic polyurethane methyl acrylate, 8kg of mixed dimethyl diacid, putting into a container, uniformly stirring, taking 20kg of laser pigment, 1.6kg of photoinitiator and 0.8kg of phosphite ester, adding and stirring at a high speed for 60 minutes for later use.
The printed matter passes through the digital jet printer, the first machine set of the digital jet printer carries out the jet printing of trademark characters, the speed is 4000 sheets/hour, and two 16kwUV lamps are opened in full power. The second machine set of the digital jet printer then carries out jet printing of transparent UV lines, and two 16kwUV lamps are powered on by 100%. Through detection, the product is thoroughly dried and is firmly solidified. The height of the actually measured transparent UV line is 0.25mm, and the laser effect is very strong.
Specific application example 4: under the condition that other process conditions are the same, the liquid drop quantity of uv laser jet printing ink is changed, the thickness of the ink layer is greatly influenced, and different laser effects can be obtained. The power of the ultraviolet drying lamp is also required to be adjusted to ensure thorough drying after the change of the ink drop quantity
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (5)
1. A laser digital jet printing method is characterized in that: the method comprises the following steps:
(1) The special digital jet printer unit is selected, is a single Zhang Duikai format unit and comprises two units, namely a first jet printer unit and a second jet printer unit;
(2) Preparing special laser jet printing ink;
(3) Inputting manuscripts to be processed into a central processing platform of a digital jet printer, and performing graphic and text pre-printing processing to form a working instruction;
(4) The central processing platform (1) sends working instructions to a first spray head unit (3-1) and a paper conveying unit (2) of the first spray printing unit (3), the paper conveying unit synchronously feeds paper into the first spray printing unit (3), the first spray head unit (3-1) sprays printing ink on the surface of a printed matter by using special laser spray printing ink, and the spray printing is finished, and simultaneously, an ultraviolet drying unit (4) on the digital spray printing unit instantly dries and solidifies spray drawing texts to obtain plane images and texts;
(5) The central processing platform (1) synchronously sends out instructions to the second jet printing unit (5), the second nozzle unit (5-1) of the second jet printing unit carries out local UV transparent varnish jet printing on the position of the image and text which is just solidified on the surface of a printed matter, and the image and text is immediately dried and solidified by the ultraviolet drying unit (4);
(6) Collecting and finishing printed matters subjected to spray printing through a paper collecting unit (7);
the spray heads used by the first spray head unit (3-1) and the second spray head unit (5-1) are of a light management GN5/6 series, the resolution is 600dpi, the liquid drop quantity is 7-21pl, the spray frequency is 50hz, and the normal processing speed is 4000-4500P/H; the special laser jet printing ink comprises the following components in parts by weight: 45-57% of acrylic resin binder, 0.1-1% of phosphite ester, 5-10% of dimethyl mixed diacid, 18-25% of laser pigment, 0.3-2% of photoinitiator and 1-5% of ethylene glycol monobutyl ether.
2. The laser digital jet printing method of claim 1, wherein the method comprises the following steps: the laser pigment is formed by vacuum evaporation of a high-purity aluminum layer on the surface of a film to form an aluminum plating film, then pressing a laser mould pressing plate on the surface of the aluminum plating film at 125 ℃, then placing the aluminum plating film in an organic solvent to strip the film to obtain a laser aluminum foil, crushing the laser aluminum foil to obtain laser powder, and dissolving the laser powder into a connecting material to form the laser metal pigment.
3. The laser digital jet printing method of claim 2, wherein the method comprises the following steps: the particle size of the laser pigment is 1-10um.
4. The laser digital jet printing method of claim 1, wherein the method comprises the following steps: and 5, spray printing is local screening spray printing, and the spray printing position is according to a preset image and text.
5. The laser digital jet printing method of claim 1, wherein the method comprises the following steps: in the step 5, the height of the ink layer of the spray printing pattern is 0.2+/-0.05 mm, the ink layer is a regular screening grid, and a transparent grid hole structure similar to a triangular prism structure is required to be formed on the surface of a product after the process is finished.
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| CN1122395A (en) * | 1993-06-15 | 1996-05-15 | 佳能株式会社 | Cast coated paper for ink jet recording |
| EP1586459A1 (en) * | 2004-02-20 | 2005-10-19 | Agfa-Gevaert | Improved ink-jet printing system |
| CN110949031A (en) * | 2019-12-12 | 2020-04-03 | 苏州胜利精密制造科技股份有限公司 | Curved glass printing process |
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| CN102765270A (en) * | 2011-05-05 | 2012-11-07 | 吴东杰 | Printing method for realizing transfer laser effect by ink jet printing |
| JP5389120B2 (en) * | 2011-08-24 | 2014-01-15 | 富士フイルム株式会社 | Image forming method |
| EP2787046B1 (en) * | 2013-04-04 | 2018-06-06 | HP Scitex Ltd | Photo-curable ink composition |
| CN105001709B (en) * | 2015-07-08 | 2018-08-31 | 合肥旭阳铝颜料有限公司 | A kind of laser mirror surface ink |
| JP6536393B2 (en) * | 2015-12-18 | 2019-07-03 | コニカミノルタ株式会社 | Image formation method |
| CN107738521A (en) * | 2017-11-02 | 2018-02-27 | 苏州太平洋印务有限公司 | Laser printing process |
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| CN1122395A (en) * | 1993-06-15 | 1996-05-15 | 佳能株式会社 | Cast coated paper for ink jet recording |
| EP1586459A1 (en) * | 2004-02-20 | 2005-10-19 | Agfa-Gevaert | Improved ink-jet printing system |
| CN110949031A (en) * | 2019-12-12 | 2020-04-03 | 苏州胜利精密制造科技股份有限公司 | Curved glass printing process |
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