CN113635685A - Screen printing method - Google Patents
Screen printing method Download PDFInfo
- Publication number
- CN113635685A CN113635685A CN202110925532.6A CN202110925532A CN113635685A CN 113635685 A CN113635685 A CN 113635685A CN 202110925532 A CN202110925532 A CN 202110925532A CN 113635685 A CN113635685 A CN 113635685A
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- China
- Prior art keywords
- screen
- ink
- silk
- printing
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000007650 screen-printing Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007639 printing Methods 0.000 claims abstract description 84
- 238000001035 drying Methods 0.000 claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 229920000728 polyester Polymers 0.000 claims abstract description 4
- 238000004080 punching Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 238000007790 scraping Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 6
- 230000009974 thixotropic effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/14—Forme preparation for stencil-printing or silk-screen printing
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Printing Methods (AREA)
Abstract
The invention relates to the technical field of printing, in particular to a screen printing method. The method specifically comprises the following steps: manufacturing a silk screen printing plate: drying a silk-screen plate by using polyester gauze, drying and cooling the silk-screen plate, transferring an exposure pattern of the silk-screen plate, putting the silk-screen plate on a screen punching table after the exposure of the silk-screen plate is finished, and washing the silk-screen plate by using water; preparing ink: after the ink is debugged and stirred, the ink is uniform, the viscosity of the ink is more than or equal to 60000mpa.s, and the fineness of the ink is less than or equal to 5 um; installing a silk-screen plate on a silk-screen machine table, conveying a printing stock to the silk-screen machine table, performing inosculation positioning on the silk-screen plate and the printing stock, adding the prepared printing ink on the silk-screen plate after the positioning is correct, and starting printing, wherein the thickness of the printing ink is controlled to be less than or equal to 8um in the printing process; and after printing is finished, transferring the printed product into drying equipment, adjusting the baking parameters, and drying. The problem of poor screen printing size is avoided by changing the viscosity, fineness and thickness of the printing ink.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a screen printing method.
Background
Screen-skip printing is a well-known printing method and has a long history. Ink or other pigment placed on the surface being imprinted is allowed to flow down through the fine mesh of the screen and onto a printing surface or base located below the screen. The pattern to be printed is first applied to the screen such that the non-image portions adjacent the printed pattern are impermeable to the ink, so that the ink selectively passes through the screen to land on the underlying printing surface as the print medium passes over the screen printing plate. Accurate color printing can be performed because a photoengraving technology is applied in the process of preparing the screen printing formes, each screen printing forme has a specific color, and accurate color patterns can be overprinted by using the screen printing formes in sequence.
Ink is an important material for printing packaging materials, which presents patterns and characters on a printing material by printing, and includes a main component and an auxiliary component, which are uniformly mixed and repeatedly rolled to form a viscous colloidal fluid. The existing printing ink has large fluidity and is easy to cause the problem of poor screen printing size, and the fineness of the printing ink cannot meet the requirement of high-precision printing of the size.
Disclosure of Invention
The invention aims to provide a screen printing method, which improves the qualification rate of products.
In order to achieve the purpose, the invention adopts the following technical scheme:
a screen printing method comprising the steps of:
manufacturing a silk screen printing plate: drying a silk-screen plate by using polyester gauze, drying and cooling the silk-screen plate, transferring an exposure pattern of the silk-screen plate, putting the silk-screen plate on a screen punching table after the exposure of the silk-screen plate is finished, and washing the silk-screen plate by using water;
preparing ink: after the ink is debugged and stirred, the ink is uniform, the viscosity of the ink is more than or equal to 60000mpa.s, and the fineness of the ink is less than or equal to 5 um;
installing the silk-screen printing plate on a silk-screen machine table, conveying a printing stock to the silk-screen machine table, positioning the silk-screen printing plate and the printing stock in a matching manner, adding the prepared printing ink on the silk-screen printing plate to start printing after the positioning is correct, and controlling the thickness of the printing ink to be less than or equal to 8um in the printing process;
and after printing is finished, transferring the printed product into drying equipment, and drying after the baking parameters are adjusted.
Preferably, in the process of drying the screen printing plate, the method for coating the photosensitive paste comprises the following steps:
a. placing a screen frame at an inclination angle of 70-80 degrees, enabling the printing surface to face outwards, coating three to five times of photosensitive paste on the printing surface, then coating three to five times of photosensitive paste on the scraping surface, and then putting the silk-screen printing plate into a drying box for drying, wherein the drying temperature is 35-40 ℃;
b. coating photosensitive paste for one to two times on a printing surface, then coating photosensitive paste for one to two times on a scraping surface, and then putting the silk-screen printing plate into a drying box for drying, wherein the drying temperature is 35-40 ℃;
c. repeating step b two to four times.
Preferably, the step of preparing the ink further comprises grinding, grinding the ink after adjusting the ink, and stirring the ink after grinding.
Preferably, when the ink is added, the ink is selected according to the line thickness of the printed line pattern on the printing stock, and the viscosity of the ink used for the thin line pattern is smaller than that of the ink used for the thick line pattern.
Preferably, the thixotropic index of the ink is 2.0-8.0.
Preferably, the mesh number of the silk screen plate is 300-600 meshes.
Preferably, the thickness of the screen of the silk-screen printing plate is 23-25 um.
Preferably, the ink is selected according to the mesh number of the silk screen, and the mesh number of the silk screen is matched with the fineness of the ink;
the mesh number of the silk screen is 300-450 meshes, and the fineness of the printing ink is more than or equal to 5 um; the mesh number of the silk screen is 450-600 meshes, and the fineness of the printing ink is less than or equal to 3 mu m.
Preferably, during printing, the tension of the silk-screen printing plate is 21N-24N, the glue scraping hardness is 75 degrees, the angle of a scraper is 45 degrees, the pressure of the scraper is 21 kg-24 kg, and the advancing speed of the scraper is 3.5-4.5 m/min.
Preferably, the printing process also comprises a detection link, and the appearance of the printed line pattern and the line size are confirmed by using a microscope, and the printed line pattern is moved into drying equipment after the size and the appearance meet the required standards.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the viscosity of the ink is not less than 60000mpa.s, the fluidity of the ink is good under the condition that the fineness of the ink is not more than 5um, the viscosity and the fineness of the ink are controlled, the fluidity of the ink can be increased under the condition that the viscosity of the ink is low, and the overflow of the ink after the ink reaches a printing stock to form a pattern is reduced. The thickness of the printing ink is less than or equal to 8um, and the problem of large overflow on a printing stock due to thicker printing ink can be effectively solved. By changing the viscosity, the fineness and the thickness of the printing ink, the problem of poor screen printing size is effectively avoided, and the fineness of the printing ink can meet the requirement of high-precision printing.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and 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 invention.
The technical solution of the present invention is further explained by the following embodiments.
A screen printing method comprising the steps of:
manufacturing a silk screen printing plate: drying a silk-screen plate by polyester gauze with the gauze mesh number of 27-50 threads/cm, drying and cooling the silk-screen plate, transferring exposure patterns of the silk-screen plate, placing the silk-screen plate on a screen punching table after the exposure of the silk-screen plate is finished, and washing the silk-screen plate by water;
preparing ink: the ink is debugged on an electronic scale according to the formula, the ink is positively and negatively stirred on an ink stirrer for 5-10min to ensure that the ink is uniform, and the viscosity of the ink is more than or equal to 60000 mpa.s;
installing a silk-screen plate on a silk-screen machine table, conveying a printing stock to the silk-screen machine table, performing inosculation positioning on the silk-screen plate and the printing stock, adding the prepared printing ink on the silk-screen plate after the positioning is correct, and starting printing, wherein the thickness of the printing ink is controlled to be less than or equal to 8um in the printing process;
and after printing is finished, transferring the printed product into drying equipment, adjusting the baking parameters, and baking for 40 minutes at 35 ℃.
Viscosity, also known as internal friction, is the resistance that one layer of fluid generates to the other layer of fluid as it moves relative to the other. Viscosity is a property of the fluid that impedes its flow. The application controls the viscosity of the ink to be printed within a certain range. The fineness refers to the roughness of the ink particles.
Specifically, the viscosity of the ink is more than or equal to 60000mpa.s, the fluidity of the ink is good under the condition that the fineness of the ink is less than or equal to 5um, the viscosity and the fineness of the ink are controlled, the fluidity of the ink can be increased under the condition that the viscosity of the ink is relatively low, and the overflow performance of the ink after the ink reaches a printing stock to form a pattern is reduced. The thickness of the printing ink is less than or equal to 8um, and the problem of large overflow on a printing stock due to thicker printing ink can be effectively solved. By changing the viscosity, the fineness and the thickness of the printing ink, the problem of poor screen printing size is effectively avoided, and the fineness of the printing ink can meet the requirement of high-precision printing.
The silk-screen printing method can be used for manufacturing relief porcelain, and the relief convex layer can have rich layering, stereoscopic impression and texture only when reaching the proper thickness. In an alternative embodiment, in the process of printing on the screen, the photosensitive paste is coated in the following order:
a. placing a screen frame at an inclination angle of 70-80 degrees, enabling the printing surface to face outwards, coating three to five times of photosensitive paste on the printing surface, then coating three to five times of photosensitive paste on the scraping surface, and then putting the silk-screen printing plate into a drying box for drying, wherein the drying temperature is 35-40 ℃;
b. coating photosensitive paste on the printing surface for one to two times, then coating photosensitive paste on the scraping surface for one to two times, and then putting the silk screen printing plate into a drying box for drying, wherein the drying temperature is 35-40 ℃;
c. repeating step b two to four times.
Through the step abc, the photosensitive paste of the relief layer screen printing plate can reach a certain thickness, and the printed relief convex layer can reach a proper thickness.
In order to further reduce the fineness of the ink, the fineness of the ink is less than or equal to 3 um. In an alternative embodiment, the step of preparing the ink is performed with additional milling, the ink is conditioned and milled, and the ink is stirred after milling, typically 4-6 times.
When the ink is added, the ink is selected according to the line thickness of the printing line pattern on the printing stock, and the viscosity of the ink used for the thin line pattern is smaller than that of the ink used for the thick line pattern. Particularly, the line pattern is thinner, if the viscosity of the ink is high, the mesh of the silk screen is easily blocked by the ink, so that the appearance of the printed line pattern is poor, and the edge tooth edge is formed. The relatively wide line pattern requires a large amount of ink, and if the ink viscosity is low, the fluidity is high, resulting in a smaller line pattern size.
In addition, the thickness of the photosensitive paste at multiple positions of the silk screen printing plate is kept uniform during printing. In the embodiment, the thickness of the photosensitive paste is kept uniform at the four corners and the central point of the screen printing plate, and the thickness of the photosensitive paste coated in the process of manufacturing the screen printing plate is less than or equal to 8 microns, so that the thickness of the photosensitive paste is controlled, and the thickness of the printing ink can be effectively improved. In practice, the thickness of the photosensitive paste at the five points can be measured by a thickness instrument.
The thixotropy of an ink refers to the ability of a liquid to reduce its viscosity due to stress and then to recover its original viscosity, and the thixotropy index is generally used to reflect the thixotropy of an ink. In an alternative embodiment, the ink has a thixotropic index of 2.0 to 8.0. The preferred thixotropic index is 3.0-7.5. When the thixotropic index is less than 2.0, the fluidity of the ink is increased, and even when the viscosity is near the upper limit of the predetermined range, for example, the ink slumps in the printed line pattern with the passage of time after printing, thereby thickening the fine pattern or the edge portion of the image. When the thixotropic index exceeds 8.0, for example, even if the viscosity is in the vicinity of the lower limit of the predetermined range, the amount of ink protruding from the screen plate becomes too large, bleeding occurs in fine patterns or image edge portions, a clear printed line pattern cannot be obtained, or fluidity deteriorates after a certain period of time, and particularly, a leveling failure occurs in the printed line pattern.
In an optional embodiment, the mesh number of the screen printing plate is 300-600 meshes. The thickness of the screen of the silk screen printing plate is 23-25 um.
In an alternative embodiment, the ink is selected according to the mesh number of the screen, and the mesh number of the screen is matched with the fineness of the ink;
the mesh number of the silk screen is 300-450 meshes, and the fineness of the printing ink is more than or equal to 5 mu m; the mesh number of the silk screen is 450-600 meshes, and the fineness of the printing ink is less than or equal to 3 mu m.
In an optional embodiment, during printing, the tension of the silk-screen printing plate is 21N-24N, the scraping hardness is 75 degrees, the angle of the scraper is 45 degrees, the pressure of the scraper is 21 kg-24 kg, and the advancing speed of the scraper is 3.5-4.5 m/min.
In an optional embodiment, the method further comprises a detection step after the printing is finished, wherein a microscope is used for confirming the appearance and the line size of the printed line pattern, professional equipment is used for detecting the roughness, and the printed line pattern is moved into drying equipment after the size and the appearance both meet the required standards. The professional equipment includes a surface roughness measuring instrument that measures the surface roughness of the ink.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A screen printing method characterized by comprising the steps of:
manufacturing a silk screen printing plate: drying a silk-screen plate by using polyester gauze, drying and cooling the silk-screen plate, transferring an exposure pattern of the silk-screen plate, putting the silk-screen plate on a screen punching table after the exposure of the silk-screen plate is finished, and washing the silk-screen plate by using water;
preparing ink: after the ink is debugged and stirred, the ink is uniform, the viscosity of the ink is more than or equal to 60000mpa.s, and the fineness of the ink is less than or equal to 5 um;
installing the silk-screen printing plate on a silk-screen machine table, conveying a printing stock to the silk-screen machine table, positioning the silk-screen printing plate and the printing stock in a matching manner, adding the prepared printing ink on the silk-screen printing plate to start printing after the positioning is correct, and controlling the thickness of the printing ink to be less than or equal to 8um in the printing process;
and after printing is finished, transferring the printed product into drying equipment, and drying after the baking parameters are adjusted.
2. The screen printing method according to claim 1, wherein in the process of printing the screen printing plate, the method of applying the photosensitive paste comprises:
a. placing a screen frame at an inclination angle of 70-80 degrees, enabling the printing surface to face outwards, coating three to five times of photosensitive paste on the printing surface, then coating three to five times of photosensitive paste on the scraping surface, and then putting the silk-screen printing plate into a drying box for drying, wherein the drying temperature is 35-40 ℃;
b. coating photosensitive paste for one to two times on a printing surface, then coating photosensitive paste for one to two times on a scraping surface, and then putting the silk-screen printing plate into a drying box for drying, wherein the drying temperature is 35-40 ℃;
c. repeating step b two to four times.
3. The screen printing method according to claim 1, wherein the step of preparing the ink further comprises grinding, grinding the ink after adjusting the ink, and stirring the ink after grinding.
4. A screen printing method according to claim 1, wherein, when the ink is added, the ink is selected in accordance with the line thickness of the printed line pattern on the substrate, and the viscosity of the ink used for a thin line pattern is lower than the viscosity of the ink used for a thick line pattern.
5. The screen printing method according to claim 1, wherein the thixotropic index of the ink is 2.0 to 8.0.
6. The screen printing method according to claim 1, wherein the screen mesh number of the screen printing plate is 300-600 mesh.
7. The screen printing method according to claim 6, wherein the screen thickness of the screen printing plate is 23-25 um.
8. The screen printing method according to claim 6, wherein the ink is selected in accordance with the mesh number of the screen, which is matched with the fineness of the ink;
the mesh number of the silk screen is 300-450 meshes, and the fineness of the printing ink is more than or equal to 5 um; the mesh number of the silk screen is 450-600 meshes, and the fineness of the printing ink is less than or equal to 3 mu m.
9. The screen printing method according to claim 1, wherein, during printing, the tension of the screen printing plate is 21N-24N, the scraping hardness is 75 degrees, the angle of the scraper is 45 degrees, the pressure of the scraper is 21 kg-24 kg, and the advancing speed of the scraper is 3.5-4.5 m/min.
10. The screen printing method according to claim 1, wherein the method further comprises a detection step of confirming the appearance of the printed line pattern and the size of the line by using a microscope, and moving the printed line pattern into a drying device after the size and the appearance meet the required standards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110925532.6A CN113635685A (en) | 2021-08-12 | 2021-08-12 | Screen printing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110925532.6A CN113635685A (en) | 2021-08-12 | 2021-08-12 | Screen printing method |
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| Publication Number | Publication Date |
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| CN113635685A true CN113635685A (en) | 2021-11-12 |
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ID=78421188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202110925532.6A Pending CN113635685A (en) | 2021-08-12 | 2021-08-12 | Screen printing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114714783A (en) * | 2022-01-26 | 2022-07-08 | 东莞华清光学科技有限公司 | Process for improving printing effect of IR (infrared radiation) ink |
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| CN110757941A (en) * | 2019-10-25 | 2020-02-07 | 杭州友成电子有限公司 | Lean screen printing plate manufacturing process |
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| CN101462426A (en) * | 2008-11-27 | 2009-06-24 | 天津市中环高科技有限公司 | Technology for printing sheet material with 3-D pattern |
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Application publication date: 20211112 |