CN112477461A - Method for three-dimensional printing by using circular dot grating - Google Patents
Method for three-dimensional printing by using circular dot grating Download PDFInfo
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- CN112477461A CN112477461A CN202011467590.0A CN202011467590A CN112477461A CN 112477461 A CN112477461 A CN 112477461A CN 202011467590 A CN202011467590 A CN 202011467590A CN 112477461 A CN112477461 A CN 112477461A
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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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Abstract
The application discloses a method for carrying out three-dimensional printing by using a dot grating, which comprises the following steps: stereo photography, drawing printed patterns before stereo photography, and offset printing the patterns to be printed on the front side and the back side of a film to manufacture an original manuscript; plate making, wherein three-dimensional printing with different grid distances needs to have different screen line combination angles of four plates of yellow, magenta, cyan and black; printing plates, stereographs, typically use offset lithographic processes; the composite column mirror plate is covered with the column mirror plate to form a three-dimensional sense; printing calibration, namely comparing a printed product with a printing bottom plate and adjusting the printing bottom plate in time; packing, namely, adopting an arc stereography method and a shutter moving method, and improving the imaging effect by utilizing the complementation of the two methods; different screen line combination angles and screen mesh angles are adopted, so that the effects of plate making and printing are improved, and the printing quality is improved; the printing finished product is calibrated and checked, the printing plate is adjusted in time, the yield is improved, and the printing waste is reduced.
Description
Technical Field
The application relates to a three-dimensional method of a dot grating, in particular to a method for performing three-dimensional printing by using the dot grating.
Background
Stereolithography, also known as 3D printing, is commonly referred to as lenticular printing. The method adopts the principle that the space difference can be generated by simulating the human eye space, the pixels with different angles and different layers are recorded on the photosensitive material, and the three-dimensional effect and even the virtual reality are presented on the two-dimensional plane image by the composition of the grating material.
Generally, only one shooting method is adopted during stereo photography, the imaging effect is influenced, the screen line combination angle and the screen mesh angle are the same during plate making and printing, the printing effect is influenced, printed products are not calibrated in time after printing, defective products are mixed in finished products, the yield is reduced, and the waste of printing is caused. Therefore, a method for performing three-dimensional printing using a circular raster is proposed to solve the above problems.
Disclosure of Invention
A method for carrying out three-dimensional printing by using a dot grating comprises the following steps:
(1) three-dimensional photography, drawing printed patterns before three-dimensional photography, carrying out three-dimensional photography by offset printing the patterns to be printed on the front side and the back side of a film, making an original manuscript by utilizing drawing software, and randomly and synchronously moving a grating nano film in front of a photosensitive film of a camera and the photosensitive film to finish photography;
(2) plate making, wherein the screen adding angles of the three-dimensional printing and the common color printing are different, the cyan plate and the black plate adopt the same screen mesh angle, and in addition, the three-dimensional printing with different grid distances has different screen line combination angles of the yellow plate, the magenta plate, the cyan plate and the black plate;
(3) the printing plate and the stereograph usually adopt an offset plate-making method, and the color separation is carried out on the photographed stereograph negative by using an electronic color separation or direct screening photographic process;
(4) after printing, the surface of the composite column mirror plate is required to be covered with the column mirror plate to form a three-dimensional effect, and the composite column mirror plate is processed into a concave-convex column mirror-shaped grating sheet by injection molding of polystyrene raw materials;
(5) printing calibration, namely taking out a printed matter printed by using the dot grating in a three-dimensional mode, comparing the printed matter with a printing bottom plate, checking whether the printed matter has misprints and misprints, adjusting the printing bottom plate in time and improving the yield;
(6) and (4) packaging, namely picking out defective products in the printed matters, and carrying out centralized box sealing, packaging, transportation and storage on the residual printed matters.
Furthermore, the image pickup of the original in the step (1) adopts an arc stereography method and a shutter moving method, and the two methods are complementary to each other, so that the imaging effect is improved.
Further, the optical axis of the camera in the step (1) always faces to the center of the shot object, the total distance of the camera motion in the circular arc stereography is based on meeting the requirement of image reproduction, and the included angle ranges from 3 degrees to 10 degrees; the moving distance of the lens in the shutter moving method is 0-60mm, the grid plate close to the photosensitive film correspondingly moves gradually, and the moving distance is 0.6mm which is one grid distance.
Furthermore, the three-dimensional printing in the step (2) uses a very fine 300-line screen, and only 8.5 or 9 dots need to be sunned when printing is performed, so that the pasting during printing is reduced, the color quantity of a dark color area is increased, and the 9-9.5 dot effect is achieved.
Furthermore, in the step (2), the number of the screen lines for plate making is more than 120 lines/cm, when a positive image is copied, the negative film and the photosensitive film are closely sealed by the line sheets with the same width as the grid distance, the printing plate for plate making uses a PS plate with better layering expressive force, and the offset lithography process is adopted for three-dimensional printing.
Furthermore, in the step (3), the screen lines are clear, overprinting is accurate, and printing ink is smooth and free of fading; the printing adopts coated paper or paperboard, and keeps compact, smooth, flat and small in flexibility. The high-precision four-color printer is used for printing, the ruled lines are strictly converged, and the constant temperature and constant humidity are kept in a workshop.
Further, the color register error in the printing in the step (3) is less than 0.02 mm.
Further, in the step (4), the polystyrene is colorless and transparent (the transparency reaches 88% -92%), has the refractive index of 1.59-1.6, has no ductility and flammability, and generates birefringence stress when being processed into transparent plastics.
Further, the printing bottom plate is fixedly placed in the step (5), and a plurality of printed matters are placed below the printing bottom plate for comparison, so that the calibration efficiency of the printed matters is improved, and the printing quality is improved.
Further, in the step (6), the defective products are separated, so that the mixing of the defective products and the complete finished products caused by errors is avoided, the printing yield is calculated, the defective products are recycled, and the waste of printing resources is reduced.
The beneficial effect of this application is: the application provides a method for three-dimensional printing by using a dot grating.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flow chart of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The first embodiment is as follows:
a method for carrying out three-dimensional printing by using a dot grating comprises the following steps:
(1) three-dimensional photography, drawing printed patterns before three-dimensional photography, carrying out three-dimensional photography by offset printing the patterns to be printed on the front side and the back side of a film, making an original manuscript by utilizing drawing software, and randomly and synchronously moving a grating nano film in front of a photosensitive film of a camera and the photosensitive film to finish photography;
(2) plate making, wherein the screen adding angles of the three-dimensional printing and the common color printing are different, the cyan plate and the black plate adopt the same screen mesh angle, and in addition, the three-dimensional printing with different grid distances has different screen line combination angles of the yellow plate, the magenta plate, the cyan plate and the black plate;
(3) the printing plate and the stereograph usually adopt an offset plate-making method, and the color separation is carried out on the photographed stereograph negative by using an electronic color separation or direct screening photographic process;
(4) after printing, the surface of the composite column mirror plate is required to be covered with the column mirror plate to form a three-dimensional effect, and the composite column mirror plate is processed into a concave-convex column mirror-shaped grating sheet by injection molding of polystyrene raw materials;
(5) printing calibration, namely taking out a printed matter printed by using the dot grating in a three-dimensional mode, comparing the printed matter with a printing bottom plate, checking whether the printed matter has misprints and misprints, adjusting the printing bottom plate in time and improving the yield;
(6) and (4) packaging, namely picking out defective products in the printed matters, and carrying out centralized box sealing, packaging, transportation and storage on the residual printed matters.
Furthermore, the image pickup of the original in the step (1) adopts an arc stereography method and a shutter moving method, and the two methods are complementary to each other, so that the imaging effect is improved.
Further, the optical axis of the camera in the step (1) always faces to the center of the shot object, the total distance of the camera motion in the circular arc stereography is based on meeting the requirement of image reproduction, and the included angle range is 3 degrees; the moving distance of the lens in the shutter moving method is 30mm, the grid plate close to the front of the photosensitive film correspondingly moves gradually, and the moving distance is one grid distance, namely 0.6 mm.
Furthermore, the three-dimensional printing in the step (2) uses a very fine 300-line screen, and only 8.5 or 9 dots need to be sunned when printing is performed, so that the pasting during printing is reduced, the color quantity of a dark color area is increased, and the 9-9.5 dot effect is achieved.
Furthermore, in the step (2), the number of the screen lines for plate making is more than 120 lines/cm, when a positive image is copied, the negative film and the photosensitive film are closely sealed by the line sheets with the same width as the grid distance, the printing plate for plate making uses a PS plate with better layering expressive force, and the offset lithography process is adopted for three-dimensional printing.
Furthermore, in the step (3), the screen lines are clear, overprinting is accurate, and printing ink is smooth and free of fading; the printing adopts coated paper or paperboard, and keeps compact, smooth, flat and small in flexibility. The high-precision four-color printer is used for printing, the ruled lines are strictly converged, and the constant temperature and constant humidity are kept in a workshop.
Further, the color register error in the printing in the step (3) is less than 0.02 mm.
Further, in the step (4), the polystyrene is colorless and transparent (the transparency reaches 88% -92%), has the refractive index of 1.59, has no ductility and flammable characteristics, and generates birefringence stress when being processed into transparent plastics.
Further, the printing bottom plate is fixedly placed in the step (5), and a plurality of printed matters are placed below the printing bottom plate for comparison, so that the calibration efficiency of the printed matters is improved, and the printing quality is improved.
Further, in the step (6), the defective products are separated, so that the mixing of the defective products and the complete finished products caused by errors is avoided, the printing yield is calculated, the defective products are recycled, and the waste of printing resources is reduced.
The method is suitable for the method for carrying out three-dimensional printing by using the dot grating with lower refractive index.
Example two:
a method for carrying out three-dimensional printing by using a dot grating comprises the following steps:
(1) three-dimensional photography, drawing printed patterns before three-dimensional photography, carrying out three-dimensional photography by offset printing the patterns to be printed on the front side and the back side of a film, making an original manuscript by utilizing drawing software, and randomly and synchronously moving a grating nano film in front of a photosensitive film of a camera and the photosensitive film to finish photography;
(2) plate making, wherein the screen adding angles of the three-dimensional printing and the common color printing are different, the cyan plate and the black plate adopt the same screen mesh angle, and in addition, the three-dimensional printing with different grid distances has different screen line combination angles of the yellow plate, the magenta plate, the cyan plate and the black plate;
(3) the printing plate and the stereograph usually adopt an offset plate-making method, and the color separation is carried out on the photographed stereograph negative by using an electronic color separation or direct screening photographic process;
(4) after printing, the surface of the composite column mirror plate is required to be covered with the column mirror plate to form a three-dimensional effect, and the composite column mirror plate is processed into a concave-convex column mirror-shaped grating sheet by injection molding of polystyrene raw materials;
(5) printing calibration, namely taking out a printed matter printed by using the dot grating in a three-dimensional mode, comparing the printed matter with a printing bottom plate, checking whether the printed matter has misprints and misprints, adjusting the printing bottom plate in time and improving the yield;
(6) and (4) packaging, namely picking out defective products in the printed matters, and carrying out centralized box sealing, packaging, transportation and storage on the residual printed matters.
Furthermore, the image pickup of the original in the step (1) adopts an arc stereography method and a shutter moving method, and the two methods are complementary to each other, so that the imaging effect is improved.
Further, the optical axis of the camera in the step (1) always faces to the center of the shot object, the total distance of the camera motion in the circular arc stereography is based on meeting the requirement of image reproduction, and the included angle range is 10 degrees; the moving distance of the lens in the shutter moving method is 60mm, the grid plate close to the front of the photosensitive film correspondingly moves gradually, and the moving distance is 0.6mm which is one grid distance.
Furthermore, the three-dimensional printing in the step (2) uses a very fine 300-line screen, and only 8.5 or 9 dots need to be sunned when printing is performed, so that the pasting during printing is reduced, the color quantity of a dark color area is increased, and the 9-9.5 dot effect is achieved.
Furthermore, in the step (2), the number of the screen lines for plate making is more than 120 lines/cm, when a positive image is copied, the negative film and the photosensitive film are closely sealed by the line sheets with the same width as the grid distance, the printing plate for plate making uses a PS plate with better layering expressive force, and the offset lithography process is adopted for three-dimensional printing.
Furthermore, in the step (3), the screen lines are clear, overprinting is accurate, and printing ink is smooth and free of fading; the printing adopts coated paper or paperboard, and keeps compact, smooth, flat and small in flexibility. The high-precision four-color printer is used for printing, the ruled lines are strictly converged, and the constant temperature and constant humidity are kept in a workshop.
Further, the color register error in the printing in the step (3) is less than 0.02 mm.
Further, in the step (4), the polystyrene is colorless and transparent (the transparency reaches 88% -92%), has the refractive index of 1.6, has no ductility and flammable characteristics, and generates birefringence stress when the transparent plastic is processed.
Further, the printing bottom plate is fixedly placed in the step (5), and a plurality of printed matters are placed below the printing bottom plate for comparison, so that the calibration efficiency of the printed matters is improved, and the printing quality is improved.
Further, in the step (6), the defective products are separated, so that the mixing of the defective products and the complete finished products caused by errors is avoided, the printing yield is calculated, the defective products are recycled, and the waste of printing resources is reduced.
The method is suitable for the method for carrying out three-dimensional printing by using the dot grating with higher refractive index.
The application has the advantages that:
the arc stereography method and the shutter moving method are adopted, and the two methods are complementary, so that the imaging effect is improved; different screen line combination angles and screen mesh angles are adopted, so that the effects of plate making and printing are improved, and the printing quality is improved; the printing finished product is calibrated and checked, the printing plate is adjusted in time, defective products are separated, the rate of finished products is improved, and printing waste is reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for three-dimensional printing by using circular point grating is characterized in that: the method for carrying out three-dimensional printing by using the circular dot grating comprises the following steps:
(1) three-dimensional photography, drawing printed patterns before three-dimensional photography, carrying out three-dimensional photography by offset printing the patterns to be printed on the front side and the back side of a film, making an original manuscript by utilizing drawing software, and randomly and synchronously moving a grating nano film in front of a photosensitive film of a camera and the photosensitive film to finish photography;
(2) plate making, wherein the screen adding angles of the three-dimensional printing and the common color printing are different, the cyan plate and the black plate adopt the same screen mesh angle, and in addition, the three-dimensional printing with different grid distances has different screen line combination angles of the yellow plate, the magenta plate, the cyan plate and the black plate;
(3) the printing plate and the stereograph usually adopt an offset plate-making method, and the color separation is carried out on the photographed stereograph negative by using an electronic color separation or direct screening photographic process;
(4) after printing, the surface of the composite column mirror plate is required to be covered with the column mirror plate to form a three-dimensional effect, and the composite column mirror plate is processed into a concave-convex column mirror-shaped grating sheet by injection molding of polystyrene raw materials;
(5) printing calibration, namely taking out a printed matter printed by using the dot grating in a three-dimensional mode, comparing the printed matter with a printing bottom plate, checking whether the printed matter has misprints and misprints, adjusting the printing bottom plate in time and improving the yield;
(6) and (4) packaging, namely picking out defective products in the printed matters, and carrying out centralized box sealing, packaging, transportation and storage on the residual printed matters.
2. The method of claim 1, wherein the method comprises: in the step (1), the image pickup of the original manuscript is realized by adopting an arc stereography method and a shutter moving method, and the two methods are complementary to each other, so that the imaging effect is improved.
3. The method of claim 1, wherein the method comprises: the optical axis of the camera in the step (1) always faces to the center of the shot object, the total moving distance of the camera in the circular arc stereography is subject to the requirement of image reproduction, and the included angle ranges from 3 degrees to 10 degrees; the moving distance of the lens in the shutter moving method is 0-60mm, the grid plate close to the photosensitive film correspondingly moves gradually, and the moving distance is 0.6mm which is one grid distance.
4. The method of claim 1, wherein the method comprises: the three-dimensional printing in the step (2) uses a very fine 300-line screen, and only 8.5 dots or 9 dots are needed to be dried in the process of printing, so that the plate pasting in the process of printing is reduced, the color quantity of a dark color area is increased, and the effect of 9-9.5 dots is achieved.
5. The method of claim 1, wherein the method comprises: in the step (2), the number of the screen lines for plate making is more than 120 lines/cm, when a positive image is copied, the negative film and the photosensitive film are sealed and need to be provided with the line sheets with the same width as the grid distance, the printing plate for sun printing uses a PS plate with better layering expressive force, and the three-dimensional printing adopts a lithographic offset printing process for printing.
6. The method of claim 1, wherein the method comprises: in the step (3), the screen lines are clear, overprinting is accurate, and printing ink is smooth and free of fading; the printing adopts coated paper or paperboard, keeps compact, bright and clean, flat and small in flexibility, and the high-precision four-color printing machine is used for printing, strictly meets the rule, and keeps constant temperature and constant humidity in a workshop.
7. The method of claim 1, wherein the method comprises: and (4) the color register error in the printing in the step (3) is less than 0.02 mm.
8. The method of claim 1, wherein the method comprises: in the step (4), the polystyrene is colorless and transparent (the transparency reaches 88% -92%), the refractive index is 1.59-1.6, the polystyrene has the characteristics of no extensibility and flammability, and birefringent stress is generated when the transparent plastic is processed.
9. The method of claim 1, wherein the method comprises: and (5) fixedly placing the printing bottom plate, and placing a plurality of printed matters below the printing bottom plate for comparison, so that the calibration efficiency of the printed matters is improved, and the printing quality is improved.
10. The method of claim 1, wherein the method comprises: in the step (6), the defective products are separated, so that the mixing of the defective products and the complete finished products caused by errors is avoided, the printing yield is calculated, the defective products are recycled for secondary use, and the waste of printing resources is reduced.
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| CN202011467590.0A CN112477461A (en) | 2020-12-14 | 2020-12-14 | Method for three-dimensional printing by using circular dot grating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113733773A (en) * | 2021-09-23 | 2021-12-03 | 深圳市日迅鑫科技股份有限公司 | Green efficient three-dimensional printing process |
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