CN110450554B - Grating printing method - Google Patents
Grating printing method Download PDFInfo
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- CN110450554B CN110450554B CN201910703704.8A CN201910703704A CN110450554B CN 110450554 B CN110450554 B CN 110450554B CN 201910703704 A CN201910703704 A CN 201910703704A CN 110450554 B CN110450554 B CN 110450554B
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- grating
- gravure plate
- printing
- electron beam
- printing substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/10—Intaglio printing ; Gravure printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
- B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/06—Veined printings; Fluorescent printings; Stereoscopic images; Imitated patterns, e.g. tissues, textiles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
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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
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
Abstract
The invention provides a grating printing method, which comprises the following steps: providing a lenticular printing apparatus comprising: 3D grating gravure plate; the feeding device is used for providing a high-molecular grating material for the 3D grating gravure plate; the scraper is arranged between the 3D grating gravure plate and the feeding device; the conveying roller group is arranged above the 3D grating gravure plate and is used for conveying a printing substrate; the electron beam generator is arranged above the contact position of the printing substrate and the 3D grating gravure plate and is used for providing electron beam radiation energy; adding a high-molecular grating material into the feeding device, starting the 3D grating gravure plate and the conveying roller set, carrying out high-molecular grating material coating treatment on the 3D grating gravure plate, carrying out press-fitting treatment on the 3D grating gravure plate coated with the high-molecular grating material and the printing substrate conveyed by the conveying roller set, and simultaneously adopting electron beam radiation generated by an electron beam generator to carry out curing forming to prepare a grating layer on the surface of the printing substrate.
Description
Technical Field
The invention belongs to the technical field of grating three-dimensional printing, and particularly relates to a grating printing method.
Background
The grating three-dimensional printing is three-dimensional printing, and is also called 3D printing. The grating stereolithography combines the digital technology and the traditional printing technology, and utilizes the grating plate to prepare the image with three-dimensional sense on the special film, thereby showing different special effects, such as vivid three-dimensional world, movie-like smooth animation fragments and gangster magic effect on the plane. The product printed by the grating has good three-dimensional effect, continuous patterns, no seams and excellent false and true properties, so the product is widely applied to the fields of packaging products, commercial advertisements, science and education cartoons, postcards, greeting cards, anti-counterfeiting marks, trademark hangtags, mouse holders, various credit cards and the like.
The grating three-dimensional printing takes a grating plastic film as a base material, printing ink is coated on a grating gravure plate, the printing ink is transferred to the grating plastic film by adopting a grating gravure plate, and a rasterized image is formed after solidification, so that a grating three-dimensional printing product is obtained. The grating print needs to have a high light transmittance based on the use characteristics of the grating. And the traditional grating printed matter mostly adopts a UV photocuring mode to realize the curing of printing ink. Specifically, a polymer grating material is coated on the 3D grating gravure plate, and an LED photocuring device is arranged inside or on the back of the 3D grating gravure plate. When the 3D grating gravure plate carries the polymer grating material to be transferred to the position of the substrate, the 3D grating gravure plate is pressed with the substrate; meanwhile, the effective energy generated by the LED light curing device is used for curing the high-molecular grating material. However, since the LED light curing device is disposed inside or on the back of the 3D grating gravure plate, and the effective energy generated by the LED light curing device is low, it is difficult to penetrate the 3D grating gravure plate to reach the surface of the substrate, and therefore, the polymer grating material precoated on the surface of the substrate is difficult to be instantly cured, and the unsaturated bond conversion rate is low. On one hand, the incompletely reacted oligomers, the reactive diluent, the photoinitiator and the like which are remained after curing have volatility and mobility, are easy to migrate into the packaging contents (base materials) to cause pollution, and the remained unreacted substances are easy to yellow, so that the transparency of the material is reduced, and the display effect of the pattern on the surface of the base materials is influenced; on the other hand, because the unsaturated bond conversion rate is low in the curing process of the high-molecular grating material, the obtained grating layer is poor in flexibility, cracks are easily generated when the grating printed matter of the grating printed matter obtained after curing is bent to prepare various grating products, the grating coating is separated from the base material, and even the grating products are broken.
Disclosure of Invention
The invention aims to provide grating printing equipment and a grating printing method, and aims to solve the problems of low transparency and poor flexibility of a grating printed matter prepared by adopting a UV curing mode in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the present invention provides a raster printing apparatus, comprising:
a 3D raster gravure plate for forming a raster printing pattern;
the feeding device is used for providing a high-molecular grating material for the 3D grating gravure plate;
the scraper is arranged between the 3D grating gravure plate and the feeding device and is used for scraping redundant ink on the 3D grating gravure plate before pressing;
the conveying roller group is arranged above the 3D grating gravure plate and used for conveying a printing substrate and pressing the printing substrate and the 3D grating gravure plate;
and the electron beam generator is arranged above the contact position of the printing substrate and the 3D grating gravure plate and is used for providing electron beam radiation energy.
Preferably, the distance between the electron beam generator and the printing substrate is less than or equal to 50 mm.
Preferably, the electron beam generator is provided with a radiation protection cover for shielding radiation at one end close to the 3D grating intaglio plate.
Preferably, the distance between the lower end of the radiation protection cover and the printing substrate is less than or equal to 50 mm.
Preferably, the surface of the 3D grating gravure plate, which is in contact with the printing substrate, is provided with grating lines.
Preferably, the 3D grating gravure plate is a grating gravure circular plate or a grating gravure flat plate.
Preferably, the 3D grating gravure plate is a grating gravure round plate, the feeding device is an ink tank, and the 3D grating gravure plate is arranged above the ink tank and is not in contact with the ink tank.
Preferably, the printing substrate conveyed by the conveying roller group is tangent to the outer circle of the 3D grating gravure plate.
Preferably, the 3D grating gravure plate is a grating gravure plate, and the feeding device is disposed at a front end of the grating gravure plate in a traveling direction, and is configured to feed ink to the grating gravure plate before the grating gravure plate travels to a press-fit relationship with the printing substrate.
Preferably, the included angle between the scraper and the 3D grating gravure plate is 45 degrees.
The invention also provides a grating printing method, which comprises the following steps:
providing a lenticular printing apparatus, the lenticular printing apparatus comprising: a 3D raster gravure plate for forming a raster printing pattern; the feeding device is used for providing a high-molecular grating material for the 3D grating gravure plate; the scraper is arranged between the 3D grating gravure plate and the feeding device and is used for scraping redundant ink on the 3D grating gravure plate before pressing; the conveying roller group is arranged above the 3D grating gravure plate and used for conveying a printing substrate and pressing the printing substrate and the 3D grating gravure plate; the electron beam generator is arranged above the contact position of the printing substrate and the 3D grating gravure plate and is used for providing electron beam radiation energy;
adding a high-molecular grating material into the feeding device, starting the 3D grating gravure plate and the conveying roller set, carrying out high-molecular grating material coating treatment on the 3D grating gravure plate, then carrying out pressing treatment on the 3D grating gravure plate coated with the high-molecular grating material and the printing substrate conveyed by the conveying roller set, and simultaneously adopting electron beam radiation generated by an electron beam generator to carry out curing forming to prepare a grating layer on the surface of the printing substrate.
Preferably, in the step of curing by electron beam radiation generated by the electron beam generator, the radiation energy of the electron beam is 10KeV to 1000 KeV.
Preferably, the surface of the 3D grating gravure plate, which is in contact with the printing substrate, is provided with grating lines, the resolution of the grating lines is more than or equal to 90dpi, and the depth of the grating lines is 0.005mm-2 mm.
Preferably, the printing substrate is selected from a paper substrate and a plastic film substrate.
Preferably, the polymer grating material is a polymer grating material, and the polymer grating material comprises the following components in percentage by weight, based on 100% of the total weight of the polymer grating material:
3% -65% of oligomer;
23% -95% of reactive diluent;
0.1 to 12 percent of auxiliary agent;
wherein the oligomer is selected from at least one of epoxy acrylates, urethane acrylates, polyester acrylates, polyether acrylates, acrylate functionalized polyacrylate resins, epoxy functionalized polysiloxane resins, resins having vinyl ether functionality; the molecular structure of the reactive diluent contains at least one unsaturated bond.
Preferably, the oligomer is selected from at least one of EBECRYL 3700 (Zhan new), CN104A80NS (Saedoma), EPICLON EXA-4850(DIC), CN110NS (Saedoma), CNUVE151NS (Saedoma), EBECRYL8413 (Zhan new), EBECRYL 1259 (Zhan new), EBECRYL 8411 (Zhan new), CN989NS (Saedoma), EBECRYL571 (Zhan new), EBECRYL 810 (Zhan new), EBECRYL 853 (Zhan new), CN738 (Saedoma), CN3108NS (Saedoma), EBECR880 (Zhan new), EBECRYL 81 (Zhan new), EBECRYL 83 (Zhan new), CN550 (Saedoma), CERANRYL (ATE).
Preferably, the reactive diluent is at least one selected from a cyclic monofunctional reactive diluent, a multifunctional reactive diluent and a cationic reactive diluent, wherein the molecular structure of the multifunctional reactive diluent contains two or more unsaturated bonds.
Preferably, the thickness of the grating layer is 0.005mm-2 mm.
Preferably, the distance between the electron beam generator and the printing substrate is less than or equal to 50 mm.
Preferably, the electron beam generator is provided with a radiation protection cover for shielding radiation at one end close to the 3D grating intaglio plate.
Preferably, the raster printing equipment is additionally arranged on the printing machine and used for realizing the connection production.
According to the grating printing equipment provided by the invention, the electron beam generator for providing electron beam radiation energy is arranged above the contact position of the printing substrate and the 3D grating gravure plate.
Firstly, the electron beam radiation curing energy provided by the electron beam generator can penetrate through a printing substrate and reach a printing coating on the surface of the printing substrate, so that the polymer grating material transferred on the surface of the printing substrate by the grating plate is instantly cured and shaped by the electron beam radiation energy, and a grating product with a transparent grating surface is obtained.
And secondly, the grating formed by the electron beam radiation curing molding provided by the electron beam generator has high transparency, the visible light transmittance of the grating reaches more than 80 percent, and the pattern of the printing substrate can be clearly and truly displayed.
Thirdly, the electron beam radiation that adopts electron beam generator to provide is to polymer grating material solidification shaping, can show and improve unsaturated bond conversion rate, make unsaturated bond conversion rate reach more than 90%, thereby make the grating that forms have excellent pliability, and then carry out the in-process that the postprocessing prepared into the product with grating goods, can be in a flexible way with grating goods through buckling, the product of various shapes is made to multiple modes such as folding, and the in-process grating goods of buckling can not produce the crackle, also can not take place the separation between polymer grating layer in the grating goods and the substrate, thereby realize the grating refraction effect of grating product arbitrary angle, break through the bottleneck that local presents the grating refraction effect.
In addition, the electron beam radiation provided by the electron beam generator is adopted to cure and mold the high-molecular grating material, the printing substrate is not specially limited, and printing substrates of various materials can be flexibly selected, specifically, the printing substrate can be a transparent substrate and can also be a non-transparent substrate; the substrate may be a paper substrate or a plastic substrate.
According to the grating printing method provided by the invention, an electron beam generator for providing electron beam radiation energy is arranged above the contact position of the printing substrate and the 3D grating gravure plate. When the 3D grating gravure plate coated with the high-molecular grating material and the printing substrate conveyed by the conveying roller set are subjected to pressing treatment, the high-molecular grating material is cured and molded by adopting an electron beam generated by an electron beam generator, and when the printing substrate is separated from the 3D grating gravure plate, a grating microstructure with grains opposite to those of the surface of the 3D grating gravure plate is formed on the grating layer formed on the printing substrate and is peeled from the 3D grating gravure plate, so that a complete grating layer is obtained.
The electron beam provided by the electron beam generator can penetrate through the printing substrate and reach the printing coating on the surface of the printing substrate, so that the high-molecular grating material transferred on the surface of the printing substrate by the grating plate is instantly cured and shaped by the radiation energy of the electron beam, the obtained grating layer has high transparency, the visible light transmittance of the grating layer reaches more than 80 percent, and the pattern of the printing substrate can be clearly and truly displayed.
Electron beam radiation that adopts electron beam generator to provide is to polymer grating material solidification shaping, can show and improve unsaturated bond conversion rate, make unsaturated bond conversion rate reach more than 90%, thereby make the grating that forms have excellent pliability, and then carry out the in-process that the postprocessing prepared into the product with grating goods, can be in a flexible way with grating goods through buckling, the product of various shapes is made to multiple modes such as folding, and the in-process grating goods of buckling can not produce the crackle, also can not take place the separation between polymer grating layer in the grating goods and the substrate, thereby realize the grating refraction effect of grating product arbitrary angle, realize high definition formation of image purpose, break through the bottleneck that the local grating refraction effect that presents.
Compared with the traditional UV curing method which adopts a grating plastic film which is difficult to degrade and has high cost, the method adopts the electron beam radiation provided by the electron beam generator to cure and mold the high-molecular grating material, has no special limitation on the printing substrate, can flexibly select the printing substrates made of various materials, and can be specifically transparent substrates or opaque substrates; the substrate may be a paper substrate or a plastic substrate.
In conclusion, the grating prepared by the method provided by the invention has high flexibility, high light transmittance and high grating precision, and can realize the stacking and solidification of transparent materials or non-transparent materials according to preset pictures and texts and the stacking height.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a raster printing apparatus according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
1-feeding device 2-high polymer grating material 3-scraper 4-printing substrate 5-conveying roller set 6-3D grating gravure plate 7-electron beam generator 8-radiation protective cover
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiment of the present invention may be a unit of mass known in the chemical industry field, such as μ g, mg, g, and kg.
With reference to fig. 1, an embodiment of the present invention provides a raster printing apparatus, including:
a 3D raster gravure plate 6 for forming a raster printing pattern;
the feeding device 1 is used for providing a high-molecular grating material 2 for the 3D grating gravure plate 6;
the scraper 3 is arranged between the 3D grating gravure plate 6 and the feeding device 1 and is used for scraping redundant ink on the 3D grating gravure plate 6 before pressing;
the conveying roller group 5 is arranged above the 3D grating gravure plate 6 and used for conveying the printing substrate 4 and pressing the printing substrate 4 and the 3D grating gravure plate 6;
and an electron beam generator 7 which is arranged above the contact position of the printing substrate 4 and the 3D grating gravure plate 6 and is used for providing electron beam radiation energy.
The grating printing equipment provided by the invention is provided with an electron beam generator 7 for providing electron beam radiation energy above the contact position of the printing substrate 4 and the 3D grating gravure plate 6.
Firstly, the electron beam radiation curing energy provided by the electron beam generator 7 can penetrate through the printing substrate 4 and reach the printing coating on the surface of the printing substrate 4, so that the polymer grating material 2 transferred on the surface of the printing substrate 4 by the grating plate is instantly cured and shaped by the electron beam radiation energy, and the grating product with the transparent grating on the surface is obtained.
And secondly, the grating formed by the electron beam radiation curing molding provided by the electron beam generator 7 has high transparency, the visible light transmittance of the grating reaches more than 80 percent, and the pattern of the printing substrate 4 can be clearly and really displayed.
Thirdly, the electron beam radiation that adopts electron beam generator 7 to provide is to the solidification of polymer grating material 2, can show and improve unsaturated bond conversion rate, make unsaturated bond conversion rate reach more than 90%, thereby make the grating that forms have excellent pliability, and then carry out the in-process that the postprocessing prepared into the product with grating goods, can be in a flexible way with grating goods through buckling, the product of various shapes is made to multiple modes such as folding, and the in-process grating goods of buckling can not produce the crackle, also can not take place the separation between polymer grating layer in the grating goods and the substrate, thereby realize the grating refraction effect of grating products arbitrary angle, break through the bottleneck that the local grating refraction effect appears.
In addition, the high-molecular grating material 2 is cured and molded by adopting the electron beam radiation provided by the electron beam generator 7, the printing substrate 4 is not specially limited, and the printing substrate 4 made of various materials can be flexibly selected, specifically, the printing substrate can be a transparent substrate or an opaque substrate; the substrate may be a paper substrate or a plastic substrate.
In an embodiment of the invention, the raster printing apparatus comprises at least a 3D raster relief plate 6. The surface of the 3D grating gravure plate 6 is provided with grating lines for forming grating printing patterns. Specifically, the 3D grating intaglio plate 6 is provided with grating lines on the surface contacting the printing substrate 4. Preferably, the grating lines of the 3D grating gravure plate 6 are micro-concave lines, and the line depth is 0.005mm-2 mm.
In some embodiments, the 3D grating intaglio printing plate 6 is a grating intaglio circular plate, and the grating lines are formed on the outer surface of the grating intaglio circular plate. In some embodiments, the 3D lenticular printing plate 6 is a lenticular gravure plate, and the lenticular pattern is formed on the outer surface of the lenticular gravure plate that contacts the printing substrate 4. After the high polymer grating material 2 is coated on the grating lines and rotates to the position of the printing substrate 4, the printing ink in the grating lines is transferred to the surface of the printing substrate 4, and simultaneously, the surface of the printing substrate 4 is solidified and formed to form the grating on the bearing surface.
The raster printing system further comprises a feeding device 1 for supplying a factor ink to the 3D raster relief printing form 6, in particular to the raster lines on the surface of the 3D raster relief printing form 6. The charging device 1 differs according to the type of the 3D lenticular printing plate 6.
As shown in fig. 1, the 3D raster gravure plate 6 is a raster gravure circular plate, the feeding device 1 is an ink tank, and the 3D raster gravure plate 6 is disposed above the ink tank and does not contact with the ink tank. When the grating printing equipment works, printing ink is contained in the ink tank, the 3D grating gravure plate 6 is partially immersed in the ink tank, and the grating lines of the 3D grating gravure plate 6 are filled with the high-polymer grating material 2. Along with the rotation of the 3D grating gravure plate 6, the 3D grating gravure plate 6 coated with the polymer grating material 2 and the printing substrate 4 are subjected to pressing treatment, and simultaneously, the polymer grating material 2 in the 3D grating gravure plate 6 is transferred to the surface of the printing substrate 4 through curing by the curing device, and a grating coating corresponding to grating grains is formed through curing.
The grating printing equipment comprises a scraper 3 arranged between a 3D grating gravure plate 6 and a material device, wherein the scraper 3 is used for scraping off redundant ink on the 3D grating gravure plate 6 before the 3D grating gravure plate 6 is pressed with a printing substrate 4. When the grating pattern pit on the surface of the 3D grating gravure plate 6 passes through the scraper 3, the ink higher than the grating pattern pit is scraped by the scraper 3, and the ink in the grating pattern pit is left. And (3) continuing to rotate the 3D grating gravure plate 6, wherein the polymer grating material 2 in the grating grain pits on the surface of the 3D grating gravure plate 6 is contacted with the printing substrate 4 and enters the radiation range of the electron beam generator 7. Specifically, the doctor blade 3 is not strictly limited to be disposed before the lenticular printing plate advances to a position where it is pressed against the printing substrate 4, i.e., a cured printing area. In a preferred embodiment, the included angle between the scraper 3 and the 3D grating gravure plate 6 is 45 degrees, which is beneficial to scraping off the redundant ink on the 3D grating gravure plate 6, but does not affect the polymer grating material 2 in the grating lines in the 3D grating gravure plate 6.
The lenticular printing apparatus comprises a set of conveyor rollers 5 arranged above a 3D lenticular printing plate 6. The conveying roller group 5 is used for conveying the printing substrate 4 and facilitating the pressing of the printing substrate 4 and the 3D grating gravure plate 6. The conveying roller group 5 at least comprises two groups of rollers, one group of rollers is arranged at one end before the pressing position of the printing substrate 4 and the 3D grating gravure plate 6 occurs, and the other group of rollers is arranged at one end after the pressing position of the printing substrate 4 and the 3D grating gravure plate 6 occurs. And the printing substrate 4 is clamped by two groups of rollers and conveyed to the pressing position of the printing substrate 4 and the 3D grating gravure plate 6, and grating materials are printed at the position and cured and molded. In one embodiment, when the raster gravure cylinder is used, the printing substrate 4 conveyed by the conveying roller group 5 is tangent to the outer circle of the 3D raster gravure plate 6.
In the embodiment of the present invention, the grating printing apparatus further comprises an electron beam generator 7 for providing electron beam radiation energy to cure the polymer grating material 2 on the surface of the printing substrate 4. The electron beam generator 7 is arranged above the contact position of the printing substrate 4 and the 3D grating gravure plate 6. Because the printing substrate 4 is tightly attached to the 3D grating gravure plate 6, the electron beam emitted by the electron beam generator 7 penetrates through the polymer grating material 2 in the grating grain pits on the surfaces of the printing substrate 4 and the 3D grating gravure plate 6, and the polymer grating material 2 is solidified. The 3D grating gravure plate 6 continuously rotates, after the 3D grating gravure plate 6 is rotated out of the radiation range of the electron beam generator 7, the printing substrate 4 is separated from the 3D grating gravure plate 6, and the high polymer grating material 2 is completely cured on the surface of the printing substrate 4, so that the grating formed by the high polymer grating material 2 is taken away along with the printing substrate 4, and the grating grain pits on the surface of the 3D grating gravure plate 6 are left out to enter the next preparation period.
In a preferred embodiment, the distance between the electron beam generator 7 and the printing substrate 4 is less than or equal to 50mm in order to ensure that the electron beam generated by the electron beam generator 7 is radiated to the ink on the surface of the printing substrate 4 and is cured.
In a preferred embodiment, the electron beam generator 7 is provided with a radiation shield 8 at an end near the 3D raster intaglio plate 6 for shielding the electron beam generated by the electron beam generator 7 from radiation to areas outside the print curing zone. Further preferably, the distance between the lower end of the radiation protection cover 8 and the printing substrate 4 is 50mm or less, thereby exerting a better radiation shielding effect.
The grating printing equipment provided by the embodiment of the invention can be additionally arranged on a printing machine and is used for realizing connection production.
The embodiment of the invention provides a grating printing method, which comprises the following steps:
s01, providing a grating printing device, wherein the grating printing device comprises: a 3D raster gravure plate for forming a raster printing pattern; the feeding device is used for providing a high-molecular grating material for the 3D grating gravure plate; the scraper is arranged between the 3D grating gravure plate and the feeding device and is used for scraping redundant ink on the 3D grating gravure plate before pressing; the conveying roller group is arranged above the 3D grating gravure plate and used for conveying a printing substrate and pressing the printing substrate and the 3D grating gravure plate; the electron beam generator is arranged above the contact position of the printing substrate and the 3D grating gravure plate and is used for providing electron beam radiation energy;
s02, adding a high-molecular grating material into the feeding device, starting the 3D grating gravure plate and the conveying roller set, carrying out high-molecular grating material coating treatment on the 3D grating gravure plate, then carrying out pressing treatment on the 3D grating gravure plate coated with the high-molecular grating material and the printing substrate conveyed by the conveying roller set, and simultaneously adopting electron beam radiation generated by an electron beam generator to carry out curing forming to prepare a grating layer on the surface of the printing substrate.
According to the grating printing method provided by the embodiment of the invention, an electron beam generator for providing electron beam radiation energy is arranged above the contact position of the printing substrate and the 3D grating gravure plate. When the 3D grating gravure plate coated with the high-molecular grating material and the printing substrate conveyed by the conveying roller set are subjected to pressing treatment, the high-molecular grating material is cured and molded by adopting an electron beam generated by an electron beam generator, and when the printing substrate is separated from the 3D grating gravure plate, a grating microstructure with grains opposite to those of the surface of the 3D grating gravure plate is formed on the grating layer formed on the printing substrate and is peeled from the 3D grating gravure plate, so that a complete grating layer is obtained. Because the electron beam provided by the electron beam generator in the embodiment of the invention can penetrate through the printing substrate and reach the printing coating on the surface of the printing substrate, the high-molecular grating material transferred on the surface of the printing substrate by the grating plate is instantly cured and shaped by the radiation energy of the electron beam, the obtained grating layer has high transparency, the visible light transmittance of the grating layer reaches more than 80 percent, and the pattern of the printing substrate can be clearly and truly displayed.
Electron beam radiation that adopts electron beam generator to provide is to polymer grating material solidification shaping, can show and improve unsaturated bond conversion rate, make unsaturated bond conversion rate reach more than 90%, thereby make the grating that forms have excellent pliability, and then carry out the in-process that the postprocessing prepared into the product with grating goods, can be in a flexible way with grating goods through buckling, the product of various shapes is made to multiple modes such as folding, and the in-process grating goods of buckling can not produce the crackle, also can not take place the separation between polymer grating layer in the grating goods and the substrate, thereby realize the grating refraction effect of grating product arbitrary angle, realize high definition formation of image purpose, break through the bottleneck that the local grating refraction effect that presents.
Compared with the traditional UV curing method which adopts a grating plastic film which is difficult to degrade and high in cost, the embodiment of the invention adopts the electron beam radiation provided by the electron beam generator to cure and mold the high-molecular grating material, has no special limitation on the printing substrate, and can flexibly select the printing substrates of various materials, specifically the printing substrates can be light-transmitting substrates and also can be light-proof substrates; the substrate may be a paper substrate or a plastic substrate.
In conclusion, the grating prepared by the method provided by the embodiment of the invention has high flexibility, high light transmittance and high grating precision, and can realize the stacking and solidification of transparent materials or non-transparent materials according to preset pictures and texts and the stacking height.
In step S01, the raster printing apparatus is the raster printing apparatus described above. Specifically, as shown in fig. 1, the lenticular printing apparatus includes at least a 3D lenticular printing plate 6. The surface of the 3D grating gravure plate 6 is provided with grating lines for forming grating printing patterns. Specifically, the 3D grating intaglio plate 6 is provided with grating lines on the surface contacting the printing substrate 4. Preferably, the grating lines of the 3D grating gravure plate 6 are micro-concave lines, and the line depth is 0.005mm-2 mm.
In the embodiment of the invention, the 3D grating gravure plate 6 is a grating gravure round plate, and grating lines are formed on the outer surface of the grating gravure round plate. After the grating lines are coated with the grating ink 2 and rotated to the position of the printing substrate 4, the ink in the grating lines is transferred to the surface of the printing substrate 4, and simultaneously, the surface of the printing substrate 4 is solidified and formed to form the grating on the bearing surface. The grating printing equipment also comprises a feeding device 1 for providing high-molecular grating materials for the 3D grating gravure plate 6, in particular for the grating lines on the surface of the 3D grating gravure plate 6. In an embodiment, as shown in fig. 1, the 3D lenticular printing plate 6 is a lenticular printing plate, the feeding device 1 is an ink bath, and the 3D lenticular printing plate 6 is disposed above the ink bath without contacting the ink bath. When the grating printing equipment works, printing ink is contained in the ink tank, the 3D grating gravure plate 6 is partially immersed in the ink tank, and the grating lines of the 3D grating gravure plate 6 are filled with the high-polymer grating material 2. Along with the rotation of the 3D grating gravure plate 6, the 3D grating gravure plate 6 coated with the polymer grating material 2 and the printing substrate 4 are subjected to pressing treatment, and simultaneously, the polymer grating material 2 in the 3D grating gravure plate 6 is transferred to the surface of the printing substrate 4 through curing by the curing device, and a grating coating corresponding to grating grains is formed through curing.
The grating printing equipment comprises a scraper 3 arranged between a 3D grating gravure plate 6 and a material device, wherein the scraper 3 is used for scraping off redundant ink on the 3D grating gravure plate 6 before the 3D grating gravure plate 6 is pressed with a printing substrate 4. When the grating pattern pit on the surface of the 3D grating gravure plate 6 passes through the scraper 3, the ink higher than the grating pattern pit is scraped by the scraper 3, and the ink in the grating pattern pit is left. And (3) continuing to rotate the 3D grating gravure plate 6, wherein the polymer grating material 2 in the grating grain pits on the surface of the 3D grating gravure plate 6 is contacted with the printing substrate 4 and enters the radiation range of the electron beam generator 7. Specifically, the doctor blade 3 is not strictly limited to be disposed before the lenticular printing plate advances to a position where it is pressed against the printing substrate 4, i.e., a cured printing area. In a preferred embodiment, the included angle between the scraper 3 and the 3D grating gravure plate 6 is 45 degrees, which is beneficial to scraping off the redundant ink on the 3D grating gravure plate 6, but does not affect the polymer grating material 2 in the grating lines in the 3D grating gravure plate 6.
The lenticular printing apparatus comprises a set of conveyor rollers 5 arranged above a 3D lenticular printing plate 6. The conveying roller group 5 is used for conveying the printing substrate 4 and facilitating the pressing of the printing substrate 4 and the 3D grating gravure plate 6. The conveying roller group 5 at least comprises two groups of rollers, one group of rollers is arranged at one end before the pressing position of the printing substrate 4 and the 3D grating gravure plate 6 occurs, and the other group of rollers is arranged at one end after the pressing position of the printing substrate 4 and the 3D grating gravure plate 6 occurs. And the printing substrate 4 is clamped by two groups of rollers and conveyed to the pressing position of the printing substrate 4 and the 3D grating gravure plate 6, and grating materials are printed at the position and cured and molded. In one embodiment, when the raster gravure cylinder is used, the printing substrate 4 conveyed by the conveying roller group 5 is tangent to the outer circle of the 3D raster gravure plate 6.
In the embodiment of the present invention, the grating printing apparatus further comprises an electron beam generator 7 for providing electron beam radiation energy to cure the polymer grating material 2 on the surface of the printing substrate 4. The electron beam generator 7 is arranged above the contact position of the printing substrate 4 and the 3D grating gravure plate 6. Because the printing substrate 4 is tightly attached to the 3D grating gravure plate 6, the electron beam emitted by the electron beam generator 7 penetrates through the polymer grating material 2 in the grating grain pits on the surfaces of the printing substrate 4 and the 3D grating gravure plate 6, and the polymer grating material 2 is solidified. The 3D grating gravure plate 6 continuously rotates, after the 3D grating gravure plate 6 is rotated out of the radiation range of the electron beam generator 7, the printing substrate 4 is separated from the 3D grating gravure plate 6, and the high polymer grating material 2 is completely cured on the surface of the printing substrate 4, so that the grating formed by the high polymer grating material 2 is taken away along with the printing substrate 4, and the grating grain pits on the surface of the 3D grating gravure plate 6 are left out to enter the next preparation period.
In a preferred embodiment, the distance between the electron beam generator 7 and the printing substrate 4 is less than or equal to 50mm in order to ensure that the electron beam generated by the electron beam generator 7 is radiated to the ink on the surface of the printing substrate 4 and is cured.
In a preferred embodiment, the electron beam generator 7 is provided with a radiation shield 8 at an end near the 3D raster intaglio plate 6 for shielding the electron beam generated by the electron beam generator 7 from radiation to areas outside the print curing zone. Further preferably, the distance between the lower end of the radiation protection cover 8 and the printing substrate 4 is 50mm or less, thereby exerting a better radiation shielding effect.
In the step S02, a polymer grating material is added into the feeding device, the polymer grating material is a polymer grating material based on an electron beam radiation curing molding technology, and the polymer grating material includes the following components in percentage by weight, based on 100% of the total weight of the polymer grating material:
3% -65% of oligomer;
23% -95% of reactive diluent;
0.1 to 12 percent of auxiliary agent;
on one hand, the high-molecular grating material provided based on the electron beam radiation curing molding technology does not need to introduce a photoinitiator, and because the oligomer selected by the embodiment of the invention is at least one of epoxy acrylate, polyurethane acrylate, polyester acrylate, polyether acrylate and epoxy functionalized polysiloxane resin, and forms a high-molecular network structure after reacting with a reactive diluent under the action of electron beam radiation, the unsaturated bond conversion rate can be improved, the unsaturated bond conversion rate is up to more than 90%, and the content of unreacted oligomer is obviously reduced. The grating layer obtained by curing and molding the raw materials has low content of residual oligomer and does not introduce a photoinitiator, so that the material can be prevented from yellowing, the transparency of the obtained high-molecular grating material is improved, the visible light transmittance of the high-molecular grating material is over 80 percent, and the grating layer can clearly and truly display a substrate pattern when being used as a grating material. In addition, the unsaturated bond conversion rate of the oligomer and the reactive diluent is up to 90%, so that the stability and durability of the obtained high-molecular grating material can be improved, and the service life of the grating material for clearly and truly displaying the base material pattern is prolonged.
On the other hand, the polymer grating material provided by the embodiment of the invention based on the electron beam radiation curing molding technology does not need to introduce a photoinitiator, and because the oligomer selected by the invention is at least one selected from epoxy acrylate, polyurethane acrylate, polyester acrylate, polyether acrylate and epoxy functionalized polysiloxane resin, the oligomer reacts with a reactive diluent under the action of electron beam radiation to form a polymer network structure, the polymer grating material has excellent flexibility, so that a grating product prepared by grating printing has excellent flexibility. And then carry out the in-process of postprocessing preparation product with the grating goods, can make the grating goods into the product of various shapes through multiple modes such as buckling, folding in a flexible way, and the grating goods can not produce the crackle in the in-process of buckling, also can not take place to separate between the polymer grating layer in the grating goods and the substrate to realize the grating effect of buckling of the arbitrary angle of grating product, break through the bottleneck that local presentation grating can not buckle.
In the embodiment of the invention, the oligomer is used as a matrix raw material of the high-molecular grating material, and influences the viscosity, the flexibility, the transfer printing rate and the drying speed of the high-molecular grating material. Specifically, the oligomer is selected from at least one of epoxy acrylates, urethane acrylates, polyester acrylates, polyether acrylates, acrylate functionalized polyacrylate resins, epoxy functionalized polysiloxane resins, resins having vinyl ether functionality. The oligomers provided by the embodiment of the invention react with a reactive diluent under the action of electron beam radiation to form a high-molecular network structure, and the obtained network structure has good flexibility and is convenient for processing a grating product formed by printing into a grating product with an unlimited shape; and has better light transmittance, thereby providing the pattern display effect of the grating product. In addition, the oligomer is adopted to react with the active diluent under the action of electron beam radiation to form a high-molecular network structure, so that the structure stability is excellent, and the service life of the grating material for clearly and truly displaying the base material pattern is prolonged.
In a preferred embodiment, the oligomer is selected from at least one of EBECRYL 3700 (mazzo), CN104a80NS (mazzo), EPICLON EXA-4850(DIC), CN110NS (mazzo), CNUVE151NS (mazzo), EBECRYL8413 (mazzo), EBECRYL 1259 (mazzo), EBECRYL 8411 (mazzo), CN989NS (mazzo), EBECRYL571 (mazzo), EBECRYL 810 (mazzo), EBECRYL 853 (mazzo), CN738 (mazzo), CN3108NS (mazzo), EBECRYL880 (mazzo), EBECRYL 81 (mazzo), EBECRYL 83 (mazzo), CN550 (mazzo), cerranryl (DIC). The preferred oligomers have more excellent effects in improving the flexibility and pattern display effect of the lenticular article.
In a preferred embodiment, the oligomer may be selected from a combination of two or more. Two or more oligomers are combined, the greater the number of double bonds that can be initiated, the higher the crosslink density of the network formed. In some embodiments, the oligomer is selected from the group consisting of EBECRYL 3700, CN3108NS (sartomer). In other embodiments, the oligomer is selected from the group consisting of EBECRYL 810 (Zhan new), CERANATE (DIC), and combinations thereof.
In the embodiment of the invention, the oligomer accounts for 3-55 wt% of the total weight of the polymer grating material as 100%, and the oligomer accounts for a proper amount in the polymer grating material, so that the obtained polymer material has good viscosity and flexibility, is formed on a base material by grating printing and can obtain a grating product with excellent flexibility. In particular embodiments, the oligomer may be present in an amount of 3%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55% by weight.
In the embodiment of the invention, the polymer grating material for preparing the grating product contains the reactive diluent, and the reactive diluent is used for reacting with the oligomer under the action of electron beam radiation so as to solidify and mold the polymer grating material. Specifically, the molecular structure of the reactive diluent used in the embodiment of the present invention contains at least one unsaturated bond, and the reactive diluent is used for performing a polymerization reaction with the oligomer to construct a network structure. In addition, the active diluent is used as a diluting component, so that the viscosity of the oligomer is reduced, a high-molecular grating material with proper viscosity and fluidity is obtained after the reaction is finished, a fine micro-nano structure is formed through grating printing, and the fine micro-nano structure is quickly separated from the 3D grating gravure plate after the curing treatment. In the embodiment of the invention, the reactive diluent is selected from at least one of a monofunctional reactive diluent, a multifunctional reactive diluent and a cationic reactive diluent.
In some embodiments, the reactive diluent is selected from monofunctional reactive diluents.
In some embodiments, the reactive diluent is selected from multifunctional reactive diluents, and the multifunctional reactive diluents have two or more unsaturated bonds in their molecular structure. At this time, a plurality of unsaturated bonds of the multifunctional reactive diluent may react with a plurality of oligomers, respectively, to increase the unsaturated bond conversion rate and form a more dense and flexible network structure. Particularly, when the polymer grating material contains a plurality of oligomers, a plurality of unsaturated bonds of the multi-functional group reactive diluent can be subjected to polymerization reaction with different oligomers to construct a compact network structure containing a plurality of oligomer structures simultaneously, and the obtained double bonds can be initiated in a large amount through the cross-linking reaction of the multi-functional group reactive diluent and the oligomers, so that the formed network cross-linking density is high.
In some embodiments, the reactive diluent comprises both a monofunctional reactive diluent and a multifunctional reactive diluent.
In particular embodiments, the reactive diluent may be selected from cationic reactive diluents, but is not limited thereto. The cationic active diluent has rigid groups, so that the mechanical property and the glass transition temperature of the polymerized material are higher, and the cationic active diluent is helpful for improving the flexibility and the transparency of the polymer grating material.
Preferably, the reactive diluent has a molecular structure containing at least one functional group selected from the group consisting of a carboxyl group, an amino group and a hydroxyl group. The functional groups such as carboxyl, amino, hydroxyl and the like can further promote the crosslinking reaction between the reactive diluent and the oligomer, and are favorable for improving the density of a crosslinking structure and further improving the flexibility of the crosslinking structure.
Preferably, the reactive diluent is selected from at least one of isobornyl acrylate, acryloylmorpholine, octyl decyl acrylate mixture, propoxylated neopentyl glycol diacrylate, bisphenol a diacrylate, dipropylene glycol diacrylate, hexanediol diacrylate, tripropylene glycol diacrylate, acrylate-modified glycerol, ethoxylated trimethylolpropane triacrylate, glycerol derivative acrylates, trimethylolpropane triacrylate, polyester acrylates, polyether tetraacrylates, polyether acrylates, dipentaerythritol penta/hexaacrylate mixture (DPHA), pentaerythritol tri/tetraacrylates mixture (PETA/PETTA), cationic reactive diluents. The preferable reactive diluent has high reactivity with oligomer, and can obtain high-molecular grating with high crosslinking density and flexibility.
In the embodiment of the invention, the weight percentage of the reactive diluent is 23-95% based on 100% of the total weight of the polymer grating material, and at the moment, the content of the reactive diluent in the polymer grating material is proper, so that the obtained polymer material has good viscosity and flexibility, the grating material is formed on a base material through grating printing, and a grating product with excellent flexibility is obtained. In particular embodiments, the reactive diluent may be present in an amount of 23%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% by weight.
In the embodiment of the invention, in order to obtain a crosslinked polymer with high density and thus better improve the flexibility of the polymer grating material after curing, preferably, the molar ratio of the oligomer to the reactive diluent is 0.02-2: 1. the molar ratio of the oligomer to the active diluent is within the range, and the obtained high polymer grating material has proper viscosity and fluidity, is favorable for forming a fine micro-nano structure through grating printing, and is quickly separated from the 3D grating gravure plate after curing treatment.
In the embodiment of the invention, an auxiliary agent can be added into the polymer grating material according to the actual product performance requirement. The auxiliary agent comprises but is not limited to at least one of polymerization inhibitor, leveling agent and defoaming agent.
The polymerization inhibitor is used for preventing the oligomer and the reactive diluent in the grating high polymer material from being polymerized and gelled before printing, and is not beneficial to obtaining a grating structure by printing. Specifically, the polymerization inhibitor may be at least one selected from the group consisting of aluminum tris (N-nitroso-N-phenylhydroxylamine), methylhydroquinone, N-nitroso-N-phenylhydroxylamine ammonium salt, tert-butyl-p-benzoquinone, phenothiazine, p-hydroxyanisole, 6-tert-butyl-2, 4-dimethylphenol, and p-tert-butyl catechol.
The leveling agent is used for reducing the surface tension of a mixed system formed by the oligomer and the active diluent, so that the spreadability of the mixed system is improved, the mixed system can be uniformly and compactly filled into a micro-nano structure of a 3D grating gravure plate, and the micro-nano structure of the grating is constructed through electron beam radiation curing treatment. Specifically, the leveling agent can be at least one selected from BYK-3455, BYK-3505, BYK-381 and BYK-345.
The defoaming agent is used for reducing the surface tension of a mixed system formed by the oligomer and the reactive diluent, inhibiting the generation of foam or eliminating the generated foam, improving the filling degree in the micro-nano structure of the 3D grating gravure plate of the oligomer and the reactive diluent, and obtaining a compact grating product without holes through electron beam radiation curing treatment. Specifically, the defoaming agent can be at least one selected from BYK-019, BYK-1752, BYK-1790 and BYK-088.
The polymer grating material provided by the embodiment of the invention can be prepared by the following method.
As a specific embodiment, the preparation method of the polymer grating material includes the following steps:
providing each component according to the ligand of the high polymer grating material, dispersing at high speed for 45 minutes under the condition that the rotating speed is 800-1200 rpm, in particular 1000 rpm, and stirring uniformly to obtain the grating high polymer material with the viscosity of 1200cps @25 ℃.
In the embodiment of the invention, after the polymer grating material is added into the feeding device, the 3D grating gravure plate is started, and the 3D grating gravure plate is coated with the polymer grating material. The printing substrate is conveyed by the conveying roller group. Preferably, the resolution of the grating lines arranged on the surface of the 3D grating gravure plate is more than or equal to 90dpi, the depth of the grating lines is 0.005mm-2mm, and correspondingly, the thickness of the obtained grating layer is 0.005mm-2 mm. The printing substrate can be flexibly selected according to actual needs, and includes but is not limited to paper substrates and plastic film substrates. The paper base material can be paper, paperboard or synthetic paper, and the plastic film base material is preferably degradable plastic film.
And further, carrying out pressing treatment on the 3D grating gravure plate coated with the high-molecular grating material and the printing substrate conveyed by the conveying roller group to enable the printing substrate to be in close contact with the 3D grating gravure plate, meanwhile, curing and molding the high-molecular grating material by adopting an electron beam generated by an electron beam generator, and combining the formed grating layer and the 3D grating gravure plate on the surface of the printing substrate after stripping.
In the embodiment of the invention, the polymer grating material is cured and molded on the 3D grating gravure plate by adopting the electron beam radiation generated by the electron beam generator during the pressing treatment. In a preferred embodiment, in the step of curing and shaping by using electron beam radiation generated by the electron beam generator, the radiation energy of the electron beam is 10KeV to 1000KeV, and in this range, the electron beam generated by the electron beam generator can penetrate through the material layer with the thickness ranging from 0.01mm to 5mm, so as to cure the polymer grating material.
The following description will be given with reference to specific examples.
Example 1
A method of lenticular printing comprising the steps of:
s11, providing raster printing equipment, wherein the raster printing equipment comprises: a 3D raster gravure plate for forming a raster printing pattern; the feeding device is used for providing a high-molecular grating material for the 3D grating gravure plate; the scraper is arranged between the 3D grating gravure plate and the feeding device and is used for scraping redundant ink on the 3D grating gravure plate before pressing; the conveying roller group is arranged above the 3D grating gravure plate and used for conveying a printing substrate and pressing the printing substrate and the 3D grating gravure plate; the electron beam generator is arranged above the contact position of the printing substrate and the 3D grating gravure plate and is used for providing electron beam radiation energy;
s12, providing a high-molecular grating material for preparing a grating product, wherein the high-molecular grating material comprises the following components in percentage by weight, based on the total weight of the high-molecular grating material as 100%:
mixing the components, dispersing at high speed for 45 minutes under the condition that the rotating speed is 1000 rpm, stirring uniformly, and obtaining the grating high polymer material with the viscosity of 1200cps @25 ℃.
Adding a grating polymer material into the feeding device to start the 3D grating gravure plate, and coating the grating polymer material on the 3D grating gravure plate, wherein the resolution of the 3D grating gravure plate is 120dpi, and the texture depth of the 3D grating gravure plate is 0.05mm-0.8 mm; an electron beam generator is arranged on the periphery of the 3D grating gravure plate, a 0.2mm white cardboard (substrate) is tightly contacted with the grating plate by adopting a conveying roller device, and meanwhile, electron beam radiation is carried out, and the radiation energy is 500 KeV. The linear velocity of the 3D grating gravure plate is synchronous with that of the white cardboard, when the white cardboard is separated from the 3D grating gravure plate, the grating high polymer material which is radiation-cured on the paper is cured to form a grating microstructure opposite to the surface of the grating plate, and the grating microstructure is peeled off from the 3D grating gravure plate, so that a complete grating product is obtained.
The grating article prepared in example 1 was subjected to performance testing. The test method is as follows:
(1) light transmittance: the grating film transparent layer is irradiated by an ultraviolet light source, an infrared light source and a visible light source, the sensor respectively detects the incident light intensity of the three light sources and the light intensity after penetrating through the grating film transparent layer, the ratio of the transmitted light intensity to the incident light intensity is the light transmittance, and the light transmittance can be measured by a commercially available glass transmittance tester.
(2) Unsaturated bond conversion ratio: the infrared spectrum quantitative method is adopted for determination.
(3) Resolution ratio: measured using a grating ruler.
(4) The grating stacking height: the electronic magnifier measures the side of the grating.
(6) Parameters characterizing flexibility: GB1731-93 & lt & ltdetermination of flexibility of paint film & gt
The test result shows that the high molecular grating layer of the grating product prepared in the example 1 has the light transmittance of 85 percent, the unsaturated bond conversion rate of 93 percent, the resolution of 120dpi and the grating stacking height of 0.05mm-0.8mm, and is consistent with the 3D grating gravure plate; and the grating product has excellent flexibility, and can obtain a 3D conversion image to realize 3D printing.
Example 2
A method of making a lenticular article, which differs from example 1 in that:
the total weight of the polymer grating material is 100%, and the polymer grating material comprises the following components in percentage by weight:
adding a grating polymer material into the feeding device to start the 3D grating gravure plate, and coating the grating polymer material on the 3D grating gravure plate, wherein the resolution of the 3D grating gravure plate is 120dpi, and the texture depth of the 3D grating gravure plate is 0.05mm-0.8 mm; an electron beam generator is arranged on the periphery of the 3D grating gravure plate, a 0.2mm white cardboard (substrate) is tightly contacted with the grating plate by adopting a conveying roller device, and meanwhile, electron beam radiation is carried out, and the radiation energy is 500 KeV.
The grating article prepared in example 2 was subjected to the same performance test as in example 1. The test result shows that the polymer grating layer of the grating product prepared in the example 2 has the light transmittance of 86.2 percent, the unsaturated bond conversion rate of 93.6 percent, the resolution of 120dpi, the grating stacking height of 0.05mm-0.8mm, and is consistent with the 3D grating gravure plate; and the grating product has excellent flexibility, and can obtain a 3D conversion image to realize 3D printing.
Comparative example 1
A method of making a lenticular article comprising the steps of:
D11. providing a high-molecular grating material for preparing a grating product, wherein the high-molecular grating material comprises the following components in percentage by weight, based on the total weight of the high-molecular grating material as 100%:
mixing the components, dispersing at high speed for 45 minutes under the condition that the rotating speed is 1000 rpm, stirring uniformly, and obtaining the grating high polymer material with the viscosity of 1200cps @25 ℃.
D12. Coating the grating high polymer material on a 3D grating gravure plate, wherein the resolution of the 3D grating gravure plate is 120dpi, and the texture depth of the 3D grating gravure plate is 0.05mm-0.8 mm; a UV curing device is arranged in the 3D grating gravure plate, and a PET (polyethylene terephthalate) transparent film (base material) with the thickness of 0.2mm is tightly contacted with the grating plate by adopting a conveying roller device, and meanwhile, UV curing is carried out. The linear velocity of the 3D grating gravure plate is synchronous with that of the PET transparent film, when the PET transparent film is separated from the 3D grating gravure plate, the grating high polymer material solidified by UV on the paper is solidified to form a grating microstructure opposite to the surface of the grating plate, and the grating microstructure is peeled off from the 3D grating gravure plate, so that a complete grating product is obtained.
The grating article prepared in comparative example 1 was subjected to the same performance test as in example 1. The test result shows that the polymer grating layer of the grating product prepared in the comparative example 1 has the light transmittance of 72%, the unsaturated bond conversion rate of 65%, the resolution of 120dpi, the grating stacking height of 0.05mm-0.8mm, and is consistent with a 3D grating gravure plate, so that a 3D conversion image can be obtained, and 3D printing is realized; referring to GB1731-93 paint film flexibility determination method, the burst diameter of the grating film is larger than that of the grating film made in the embodiment, and the grating product has poor flexibility.
Comparative example 2
A method of making a lenticular article, which differs from comparative example 1 in that:
the total weight of the polymer grating material is 100%, and the polymer grating material comprises the following components in percentage by weight:
adding a grating polymer material into the feeding device to start the 3D grating gravure plate, and coating the grating polymer material on the 3D grating gravure plate, wherein the resolution of the 3D grating gravure plate is 120dpi, and the texture depth of the 3D grating gravure plate is 0.35 mm; an electron beam generator is arranged on the periphery of the 3D grating gravure plate, a 0.2mm white cardboard (substrate) is tightly contacted with the grating plate by adopting a conveying roller device, and meanwhile, electron beam radiation is carried out, and the radiation energy is 200 KeV.
The lenticular article prepared in comparative example 2 was subjected to the same performance test as in example 2. The test result shows that the polymer grating layer of the grating product prepared in the comparative example 2 has the light transmittance of 55 percent, the unsaturated bond conversion rate of 53 percent, the resolution of 120dpi and the grating stacking height of 0.35mm, and is consistent with the 3D grating gravure plate; the unsaturated building conversion rate is low after printing and curing, the light transmittance of the obtained grating is low, and the 3D printing requirement is difficult to meet.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A raster printing method, comprising the steps of:
providing a lenticular printing apparatus, the lenticular printing apparatus comprising: a 3D raster gravure plate for forming a raster printing pattern; the feeding device is used for providing a high-molecular grating material for the 3D grating gravure plate; the scraper is arranged between the 3D grating gravure plate and the feeding device and is used for scraping redundant ink on the 3D grating gravure plate before pressing; the conveying roller group is arranged above the 3D grating gravure plate and used for conveying a printing substrate and pressing the printing substrate and the 3D grating gravure plate; the electron beam generator is arranged above the contact position of the printing substrate and the 3D grating gravure plate and is used for providing electron beam radiation energy; wherein the printing substrate is selected from a paper substrate and a plastic film substrate;
adding a high-molecular grating material into the feeding device, starting the 3D grating gravure plate and the conveying roller set, performing high-molecular grating material coating treatment on the 3D grating gravure plate, then performing pressing treatment on the 3D grating gravure plate coated with the high-molecular grating material and the printing substrate conveyed by the conveying roller set, simultaneously performing radiation curing molding by adopting an electron beam generated by an electron beam generator, preparing a grating layer on the surface of the printing substrate, wherein the radiation energy of the electron beam is 10 KeV-1000 KeV,
the total weight of the polymer grating material is 100%, and the polymer grating material comprises the following components in percentage by weight:
3% -65% of oligomer;
23% -95% of reactive diluent;
0.1 to 12 percent of auxiliary agent;
wherein the oligomer is selected from the group consisting of EBECRYL 3700, CN3108NS (Saedoma).
2. The grating printing method according to claim 1, wherein the surface of the 3D grating gravure plate, which is in contact with the printing substrate, is provided with grating lines, the resolution of the grating lines is not less than 90dpi, and the depth of the grating lines is 0.005mm-2 mm.
3. The method for printing the grating as claimed in claim 1, wherein the reactive diluent is at least one selected from the group consisting of a monofunctional reactive diluent, a multifunctional reactive diluent, and a cationic reactive diluent, wherein the multifunctional reactive diluent has a molecular structure containing two or more unsaturated bonds.
4. The method for lenticular printing according to claim 3 wherein the reactive diluent is selected from at least one of isobornyl acrylate, acryloylmorpholine, mixtures of octyl decyl acrylates, propoxylated neopentyl glycol diacrylate, bisphenol A diacrylate, dipropylene glycol diacrylate, hexanediol diacrylate, tripropylene glycol diacrylate, acrylated glycerol, ethoxylated trimethylolpropane triacrylate, glycerol derivative acrylates, trimethylolpropane triacrylate, polyester acrylates, polyether tetraacrylates, polyether acrylates, mixtures of dipentaerythritol penta/hexaacrylate, and mixtures of pentaerythritol tri/tetraacrylates.
5. The lenticular printing method of any one of claims 1 to 4, wherein the distance between the electron beam generator and the substrate is 50mm or less.
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