CN110116564B - Method for silk-screen printing of monochromatic gradient effect pattern - Google Patents
Method for silk-screen printing of monochromatic gradient effect pattern Download PDFInfo
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- CN110116564B CN110116564B CN201810113325.9A CN201810113325A CN110116564B CN 110116564 B CN110116564 B CN 110116564B CN 201810113325 A CN201810113325 A CN 201810113325A CN 110116564 B CN110116564 B CN 110116564B
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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
- B41M1/12—Stencil printing; Silk-screen printing
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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
Abstract
The invention provides a method for silk-screen printing of a monochromatic gradual-change effect pattern, which comprises the steps of setting a screen printing plate in a silk-screen gradual-change effect pattern area to be a mode that pattern holes gradually change from large to small or from small to large, selecting a 90T-120T silk screen in the screen printing plate, arranging UV (ultraviolet) photocuring glue layers containing the pattern holes on two sides of the silk screen, firstly, silk-screen printing of a monochromatic gradual-change effect pattern ink layer on a transparent printing stock, wherein the angle of a scraper during silk-screen printing is 60-70 degrees, the printing speed is 10-15 times/min, and the thickness of the silk-screen ink layer is more than 15 microns; and after the pattern printing ink layer with the gradient effect is fixed, covering a bottom printing ink on the printing ink layer, wherein the thickness of the covered bottom printing ink layer is more than 3 microns, and fixing the bottom printing ink layer to obtain the target product. The method can be realized by using the existing common screen printing equipment, is convenient to operate, simple and easy to print and plate, has low cost and strong adaptability, and realizes the effect of monochrome gradual-change screen printing.
Description
Technical Field
The invention relates to the field of silk screen printing, in particular to a method for printing a monochrome gradient effect pattern by silk screen printing.
Background
The gradual change pattern is a color which is full of changing endless and mysterious romantic smell and is formed by changing the color of an object from light to dark or from dark to light or slowly transitioning from one color to another color, and the purpose effect of the gradual change pattern is difficult to achieve by using a common silk screen machine and a traditional silk screen mode. The traditional screen printing overprinting machine is used for printing the gradual change patterns, the four-color principle and the screen dot color separation are used for realizing the gradual change, and the monochrome gradual change or the color gradual change can be realized. The pattern holes of the screen printing screen are arranged in a thick and thin mode, the gradual change effect can be achieved, the pattern holes of the screen printing screen are made to be different in size for printing, the holes in the places with deep colors are larger, the holes in the places with light colors are smaller, and therefore the patterns with the color or the single-color gradual change effect can be printed through four times of printing. However, when the machine is used for printing a monochromatic gradient pattern, the aim can be achieved by overprinting four times. In addition, the machine has high requirement on the register precision of different printing times and is complex to operate. The first factor is whether the input/positioning system of the machine is correctly aligned or not, and the accurate position of each printing stock is ensured when each printing stock is conveyed from the input to the printing positioning device; the second factor is whether the tension of each screen is consistent; the third factor is whether the printing stock is influenced by various factors of machines and workshops in the process of multiple printing. Only by processing the problems related to the three factors, the color register can be accurate. In addition, the four-color screens are expensive and require specialized facilities for color separation. Therefore, it is not suitable to use the four-color principle to realize the silk-screen monochrome gradient effect pattern.
Therefore, there is a need in the art for a new method for silk-screening monochrome gradient effect patterns.
Disclosure of Invention
Therefore, the invention provides a method for silk-screen printing of a monochromatic gradual-change effect pattern, which comprises the steps of setting a screen printing plate in a silk-screen gradual-change effect pattern area to be a screen printing plate with pattern holes gradually changing from large to small or from small to large, selecting a 90T-120T silk screen in the screen printing plate, arranging UV (ultraviolet) photocuring glue layers containing the pattern holes on two sides of the silk screen, firstly, silk-screen printing of a monochromatic gradual-change effect pattern ink layer on a transparent printing stock, wherein the angle of a scraper during silk-screen printing is 60-70 degrees, the printing speed is 10-15 times/min, and the thickness of the silk-screen ink layer is more than 15 microns; and after the pattern printing ink layer with the gradient effect is fixed, covering a bottom printing ink on the printing ink layer, wherein the thickness of the covered bottom printing ink layer is more than 3 microns, and fixing the bottom printing ink layer to obtain the target product.
When the gradual-change patterns are not silk-screened, the screen gauze in the screen plate of the used common silk-screen printing equipment generally adopts a 100T-140T screen net, and the angle of the scraper is generally 70-80 degrees at the moment. The reason for reducing the scraper angle by about 10 degrees during silk-screen printing is that the oil feeding amount is larger, and the printing pattern with thicker ink layer can be obtained. In addition, the printing speed is generally 20-35 times/min when the gradual change patterns are not printed by silk, and the scraper is used for one time of back and forth calculation. In addition, when a color or monochrome gradient pattern is printed by a four-color chromatography method, a 150T-180T silk screen is generally selected as the screen in the screen, the meshes are fine, the oil feeding amount is small, and a silk-screen printing ink layer with a certain thickness can be obtained by four times of chromatography printing. As will be readily understood by those skilled in the art, the mesh openings in the screen are significantly finer than the finest openings in the pattern openings.
In a specific embodiment, the pattern holes are point holes or lines, the diameter or side length of the point hole corresponding to the small hole end is 0.03 mm-0.2 mm or the line diameter of the line corresponding to the small hole end is 0.03 mm-0.2 mm, and the center distance between two adjacent point holes at the small hole end is 0.2-1.5 mm.
In a specific implementation mode, the angle of the scraper is 62-68 degrees when the pattern printing ink layer with the gradual change effect is printed by silk, and the thickness of the covered ground color printing ink layer is 3-8 microns.
In a specific embodiment, the thickness of the ink layer for silk-screen printing when the pattern with the gradual change effect is silk-screen printed is 15-200 microns, and preferably 20-50 microns. When the ordinary screen printing does not contain the printing ink of gradual change hole, the thickness of printing ink layer is generally in 3~8 microns.
In one specific embodiment, the method for forming the silk screen printing plate comprises the following steps: firstly coating UV photosensitive glue on the two sides of a screen, also called sizing, specifically, coating the ink on the upper surface of a screen printing plate during screen printing for 2-5 times, coating the printing surface of the screen printing plate for 3-6 times, drying the surface and coating the next time after each sizing, fixing the UV photosensitive glue under the irradiation of UV light after all sizing and surface drying are finished, washing away unfixed pulp with water, and completely drying to obtain the screen printing plate containing the gradually changed pattern holes.
In a specific embodiment, the paste is applied 3 to 5 times on the ink-scraping surface of the screen and 4 to 6 times on the printing surface of the screen.
In the ordinary silk-screen process of not silk-screen the gradual change pattern, paste is generally applied on the ink scraping surface of the screen printing plate for 2 times, and paste is applied on the printing surface of the screen printing plate for 1 time, so as to obtain a thinner UV light-cured glue layer, while the invention uses thicker UV light-cured glue layers on the front and back surfaces, and the main purpose is to make the oil feeding amount larger during silk-screen printing, so as to obtain a printing pattern with thicker ink layer. In a specific embodiment, the obtained screen plate can print ink layer with thickness of more than 20um correspondingly by applying 3 times of paste on the ink scraping surface of the screen plate and 4 times of paste on the printing surface of the screen plate.
In a specific embodiment, the total thickness of the UV light curing glue layers on the two sides of the mesh is 20-40 microns.
In a particular embodiment, the method comprises: firstly, silk-screening a gradient pattern with a gradient pattern color on the back surface of a transparent printing stock, fixing the ink layer, then covering a bottom ink on the ink layer, and fixing to obtain a target product of the gradient pattern with the gradient pattern color on the front surface of the printing stock by taking the bottom color as a background.
In the invention, the printing ink is transferred to the printing stock through the holes of the image-text part by the extrusion of the scraper plate, and the image-text which is the same as the pattern holes on the screen plate is formed. The screen printing equipment is simple, the operation is convenient, the printing and the plate making are simple and easy, the cost is low, and the adaptability is strong. The screen printing has wide application range, and common printed matters comprise: color paintings, posters, business cards, binding covers, merchandise tags, printed and dyed textiles, and the like.
The invention realizes the gradual change effect of the color of the printed pattern from light to dark or from dark to light by utilizing the screen printing technology, and can realize the gradual change of any color and any pattern. The method has the advantages of free pattern design, capability of printing multiple sheets, high single-time output, low printing cost and the like. The method can be realized by using the existing common screen printing equipment, is convenient to operate, simple and easy to print and plate, has low cost and strong adaptability, and realizes the effect of monochrome gradual-change screen printing.
Drawings
Fig. 1 is a schematic view of a mobile phone panel with monochrome gradient effect patterns at the upper and lower ends.
Fig. 2 is an enlarged view of a portion of the mobile phone panel (a position of the gradient effect pattern) shown in fig. 1.
FIG. 3 is a schematic view of an IPAD panel with a bottom having a monochrome gradient effect pattern according to the present invention.
Fig. 4 is an enlarged view of a portion of the panel shown in fig. 3 (a position of a gradation effect pattern).
Detailed Description
The following describes in detail a specific embodiment of a silk-screen gradient effect pattern with reference to the accompanying drawings. Fig. 1 is a schematic view of a mobile phone panel with red gradient effect patterns at the upper and lower ends. Fig. 3 is a schematic view of an IPAD panel having a yellow gradation effect pattern at the bottom thereof according to the present invention.
The invention provides a method for silk-screen printing of a monochromatic gradual-change effect pattern, which comprises the steps of setting a screen printing plate in a silk-screen gradual-change effect pattern area to be a mode that pattern holes gradually change from large to small or from small to large, selecting a 90T-120T silk screen in the screen printing plate, arranging UV (ultraviolet) photocuring glue layers containing the pattern holes on two sides of the silk screen, firstly, silk-screen printing of a monochromatic gradual-change effect pattern ink layer on a transparent printing stock, wherein the angle of a scraper during silk-screen printing is 60-70 degrees, the printing speed is 10-15 times/min, and the thickness of the silk-screen ink layer is more than 15 microns; and after the pattern printing ink layer with the gradient effect is fixed, covering a bottom printing ink on the printing ink layer, wherein the thickness of the covered bottom printing ink layer is more than 3 microns, and fixing the bottom printing ink layer to obtain the target product.
The operation method of the invention is as follows: the invention uses the basic principle that the meshes of the image-text part and the non-image-text part of the screen printing plate are ink-permeable and the meshes of the non-image-text part are ink-impermeable to print. When printing, ink is poured into one end of the screen printing plate, a certain pressure is applied to the ink position on the screen printing plate by using screen printing frictioning, and meanwhile, the ink moves towards the other end of the screen printing plate. The ink is pressed by the scraper blade from the mesh of the image-text part to the printing material during the movement. The printing marks are fixed within a certain range due to the viscosity of the printing ink, the scraper blade is always in line contact with the screen printing plate and the printing stock in the printing process, the contact line moves along with the movement of the scraper blade, and a certain gap is kept between the screen printing plate and the printing stock, so that the screen printing plate generates a reaction force to the screen printing frictioning through the tension of the screen printing plate during printing, and the reaction force is called as a resilience force. Under the action of resilience force, the screen printing plate is in movable line contact with the printed material, and other parts of the screen printing plate are separated from the printed material. The ink and the silk screen are fractured, the printing size precision is ensured, and the smearing of printing stocks is avoided. And lifting the screen printing plate after the screen printing frictioning scrapes the whole layout, and simultaneously lifting the screen printing plate and lightly scraping the printing ink back to the initial position. This is now a print stroke.
The method of the invention firstly has all the advantages of the traditional screen printing, including:
1) is not limited by the size and the shape of the printing material. Generally, printing can be carried out on a plane, and screen printing can also be carried out on a printing stock with a special shape such as a spherical curved surface, and even the printing stock with any shape can be used.
2) The soft impression of the page is little: the screen is soft and elastic.
3) The ink layer covering power is strong.
4) Is suitable for various types of printing ink.
5) The optical rotation resistance is strong: the gloss of the printed matter can be kept unchanged (the temperature and the sunlight have no influence), so that the processes of coating films and the like are not needed when some non-setting adhesives are printed.
6) The printing mode is flexible and various.
7) Convenient plate making, low price and easy mastering of technology.
8) The adhesive force is strong.
9) The silk-screen printing can be carried out by pure manual silk-screen printing or machine printing.
10) Is suitable for long-term display, and the outdoor advertisement has strong expressive force.
Specifically, when the IPAD panel product containing the yellow gradient pattern shown in fig. 3 and 4 is prepared, two colors, a yellow (gradient pattern color) gradient pattern and black (ground color) frame ink need to be silk-screened. In the present invention, there are two specific ways to achieve this goal. One way is to screen print a yellow dot-like gradation pattern on the back of the glass, and then cover the whole surface of the yellow ink layer with black ink and fix the ink layer after fixing the ink layer. Thus obtaining the target product with the front surface of the glass taking black as a background and displaying a yellow dot-like gradually-changed pattern. The second mode is that the black frame is printed firstly, and the space is left at the gradual change pattern position and the black printing ink is not printed, so as to obtain the mesh-like hollowed black frame printing ink layer, and after the printing ink layer is fixed, the whole surface of the hollowed black frame printing ink layer is covered with the yellow printing ink and fixed. And obtaining a target product with the black background on the front surface of the glass and the yellow dot-like gradually-changed pattern. It can be seen that, in both the first and second modes, a screen having a gradation pattern is required, and the screen having the gradation pattern is used first, and then, the whole screen is printed. But in the first mode the pattern holes in the progressive screen correspond to the progressive pattern in the final product. And in the second mode, the pattern holes in the progressive screen are complementary to the progressive pattern in the final product. However, the inventor finds through experiments that when the second method is used for silk-screen printing of a monochrome gradient product, when a gradient pattern is hollowed out in the first step of silk-screen printing, the mesh point is easy to deform, and an ink layer with non-deformable pattern holes and large thickness is difficult to obtain. In the first mode, for example, an ink layer with a thickness of 200 μm can be printed by silk-screen printing when the amount of oil added is increased as much as possible.
When the process color principle and the four-color process printing method in the background technology are used for silk-screen printing of the single-color gradual change pattern, the gradual change pattern needs to be printed in the process color for four times, and at least five times in total needs to be printed after the primary ground color is printed. The method of the invention can obtain the target product only by printing the gradually-changed pattern color once and printing the ground color once.
The method of the invention continues to use the characteristic of gradual change of pattern holes in four-color overprinting, but the oil feeding amount is larger during silk-screen printing through a series of measures, so that a much thicker ink layer is printed, and the gradual change pattern can be formed by silk-screen printing through one-time silk-screen printing.
As can be seen from the attached drawings of the invention, the center distance between two adjacent dots of the light color end (small hole end) and the dark color end of the gradual change pattern is consistent. The mesh point size of the light-color end is 0.03-0.2 mm, and the mesh points of the dark-color end can be mutually overlapped and punched into a line or still have a certain distance between each other. When the existing four-color overprinting method is used for silk-screen printing of single-color gradual change patterns, the steps are complicated, at least four times of overprinting are required to be accurately aligned, and the method can only screen the mesh points with the minimum size of about 0.08mm due to equipment tolerance, four-time alignment tolerance and the like. The method provided by the invention can be used for silk-screen printing of the mesh points with the minimum size of about 0.03 mm. That is, a fine pattern like the light-colored end of the present invention cannot be obtained by the four-color process, so that the gradual change of the pattern from non-dot to dot in the product is not as soft as the present invention.
Furthermore, the method can be used for preparing the gradually-changed pattern ink layer with any thickness within 15-200 microns by one-time printing, and the larger the thickness of the ink layer is, the stronger the stereoscopic impression of the pattern is. The thickness of the ink layer printed by the four-color overprinting method is about 3 microns, so that a gradual change pattern with large ink layer thickness cannot be obtained after four overprinting, and the ink layer with the thickness as high as 200 microns cannot be obtained.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for silk-screen printing of a monochromatic gradual-change effect pattern comprises the steps of setting a screen printing plate in a silk-screen gradual-change effect pattern area to be gradually changed from large to small or from small to large, selecting a 90T-120T silk screen in the screen printing plate, arranging UV (ultraviolet) light curing glue layers containing pattern holes on two sides of the screen printing plate, enabling the total thickness of the UV light curing glue layers on the two sides of the screen printing plate to be 20-40 micrometers, silk-screen printing of a gradual-change effect pattern ink layer formed by a monochromatic color on a transparent printing stock, enabling the angle of a scraper to be 60-70 degrees during silk-screen printing, enabling the printing speed to be 10-15 times/min, and enabling the thickness of the silk-screen printing ink layer to be more; and after the pattern printing ink layer with the gradient effect is fixed, covering a bottom printing ink on the printing ink layer, wherein the thickness of the covered bottom printing ink layer is more than 3 microns, and fixing the bottom printing ink layer to obtain the target product.
2. The method for screen printing the monochrome gradient effect pattern according to claim 1, wherein the pattern holes are dot holes or lines, the diameter or side length of the dot hole corresponding to the small hole end is 0.03mm to 0.2mm or the line diameter of the line corresponding to the small hole end is 0.03mm to 0.2mm, and the center distance between two adjacent dot holes at the small hole end is 0.2mm to 1.5 mm.
3. The method for screen printing the monochrome gradient effect pattern according to claim 1, wherein the angle of the scraper is 62-68 ° when the ink layer of the gradient effect pattern is screen printed, and the thickness of the covered base ink layer is 3-8 μm.
4. The method for screen printing the monochrome gradient effect pattern according to claim 1, wherein the thickness of the ink layer of the screen printing is 15 to 200 μm when the gradient effect pattern is screen printed.
5. The method for screen printing the monochrome gradient effect pattern according to claim 4, wherein the thickness of the ink layer of the screen printing is 20-50 μm when the gradient effect pattern is screen printed.
6. The method for screen printing the monochrome gradient effect pattern according to any one of claims 1 to 5, wherein the method for forming the screen printing plate comprises the following steps: firstly coating UV photosensitive glue on the two sides of a screen, also called sizing, specifically, coating the ink on the upper surface of a screen printing plate during screen printing for 2-5 times, coating the printing surface of the screen printing plate for 3-6 times, drying the surface and coating the next time after each sizing, fixing the UV photosensitive glue under the irradiation of UV light after all sizing and surface drying are finished, washing away unfixed pulp with water, and completely drying to obtain the screen printing plate containing the gradually changed pattern holes.
7. The method for screen printing of the monochrome gradient effect pattern according to claim 6, wherein the paste is applied 3-5 times on the ink-scraping surface of the screen printing plate and 4-6 times on the printing surface of the screen printing plate.
8. The method for screen printing the monochrome gradient effect pattern according to claim 1, wherein the method comprises the following steps: firstly, silk-screening a gradient pattern with a gradient pattern color on the back surface of a transparent printing stock, fixing the ink layer, then covering a bottom ink on the ink layer, and fixing to obtain a target product of the gradient pattern with the gradient pattern color on the front surface of the printing stock by taking the bottom color as a background.
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| CN110641214A (en) * | 2019-08-14 | 2020-01-03 | 东莞金杯印刷有限公司 | Gradual powder flashing process |
| CN110879434A (en) * | 2019-11-07 | 2020-03-13 | 精电(河源)显示技术有限公司 | Preparation method of color gradient film and display device with color gradient film |
| CN111873653A (en) * | 2020-08-06 | 2020-11-03 | 美盈森集团股份有限公司 | Printing process with three-dimensional gradient effect |
| CN113696649B (en) * | 2021-08-30 | 2022-11-25 | 广州西子颜究进出口有限公司 | Method and device for realizing gradual change of patterns of cosmetic packaging box |
| CN113754306A (en) * | 2021-09-16 | 2021-12-07 | 深圳市信濠光电科技股份有限公司 | 3D glass silk-screen printing method and 3D glass with concave ink layer silk-screen printed |
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