CN107160834B - Method for preventing moire in printing process during screen printing of flat paper - Google Patents
Method for preventing moire in printing process during screen printing of flat paper Download PDFInfo
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- CN107160834B CN107160834B CN201710576005.2A CN201710576005A CN107160834B CN 107160834 B CN107160834 B CN 107160834B CN 201710576005 A CN201710576005 A CN 201710576005A CN 107160834 B CN107160834 B CN 107160834B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2200/00—Printing processes
- B41P2200/40—Screen printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2215/00—Screen printing machines
- B41P2215/10—Screen printing machines characterised by their constructional features
- B41P2215/13—Devices for increasing ink penetration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2215/00—Screen printing machines
- B41P2215/10—Screen printing machines characterised by their constructional features
- B41P2215/13—Devices for increasing ink penetration
- B41P2215/132—Devices for increasing ink penetration by increasing pressure above the screen
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- Mechanical Engineering (AREA)
- Screen Printers (AREA)
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Abstract
The invention relates to a method for preventing moire fringes in a printing process during screen printing of flat paper. The method comprises the following steps: (1) selecting an ink with proper viscosity; (2) selecting a scraper with proper hardness and a cutter head; (3) setting the air pressure to be 5-10bar, performing trial scraping once, and adjusting the pressure of the scraper according to the imprinting condition formed by the scraper and the ink; (4) printing; (5) detecting printing faults in the printing process; (6) and after printing is finished, observing the leveling process and the leveling time of the ink, adjusting the viscosity of the ink, controlling the leveling time and optimizing the printing effect. The invention comprehensively considers the influence of parameters such as a scraper, printing pressure, ink feeding amount and the like on the moire patterns, and provides a complete set of scheme for reducing the moire patterns from the aspects of the hardness of the scraper, the selection of a cutter head, the selection of the printing pressure, the intersection angle of the scraper and the screen printing plate and the like, thereby reducing the printing cost, improving the printing effect and greatly reducing the possibility of the moire patterns in the screen printing.
Description
Technical Field
The invention relates to the field of flat paper printing, in particular to a method for preventing moire fringes in the printing process during flat paper screen printing.
Background
The dots in printing are arranged according to a certain rule, but one dot can display a relatively obvious interference pattern at a certain angle, and the interference pattern is in the form of a belt, a grid, a cloud, a tortoise shell and the like, which is commonly called as a bump net (or a tortoise pattern). The moire patterns may be displayed locally with more distribution in partial mesh points, or may be paved on the whole pattern.
The problem of net collision is often encountered in printing, which is shown in that the product is in a print ripple shape, a zigzag shape and an intermittent and non-continuous shape, the appearance integrity of the printed matter is damaged, and the exquisite printing effect cannot be presented to meet the requirements of customers.
At present, the most common method for reducing moire patterns is to make a new plate. However, the re-platemaking takes longer time and is high in cost, the labor cost and the loss of printing equipment are increased, and the delivery time of the product is influenced, so that the production and operation activities of a company are adversely affected.
In the existing screen printing, 70% of moire is the reason of a screen printing plate, and 15% -20% of moire is caused by the fact that the hardness, the model and the pressure of a scraper are not matched. The manufacture of the screen is troublesome, and moire can also occur during effective screen printing if proper scrapers and pressure are not matched. If the proper doctor blade hardness and printing pressure are not selected, it is rather assumed that the screen is improperly set, which results in labor and time.
The doctor blade is typically of polyurethane material and the hardness of the blade is measured using a shore durometer, typically 55-90HSA screen printed. 55-65 HSA is of low hardness, 56-75 HSA is of medium hardness, and more than 75HSA is of high hardness.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preventing moire fringes in the printing process during the screen printing of flat paper.
The invention adopts the following technical scheme:
a method of preventing moir é during printing in screen printing of flat paper, the method comprising the steps of:
(1) selecting ink with proper viscosity according to printing requirements;
(2) selecting a scraper with proper hardness and cutter head according to the material and the flatness of the screen printing plate;
(3) selecting scraper pressure and equipment operating air pressure to be 5-10bar, trying to scrape once, and uniformly adjusting the scraper pressure at two sides according to the imprinting condition formed by the scraper and the printing ink until the printing requirement is met;
(4) selecting the intersection angle of the scraper and the screen printing plate to be 55-85 degrees, and printing;
(5) and detecting printing faults by checking prints on the screen during printing, and if obvious linear prints consistent with the running direction of a screen scraper are found, indicating that the prints are faulty and performing fault elimination.
(6) After the printing operation is finished, carefully observing the leveling process and the leveling time of the ink, controlling the leveling time by adjusting the viscosity of the ink according to the printing result, and optimizing the printing effect.
Preferably, in step (2), the hardness and the blade with a proper cutting head are selected according to the following principles: on the premise of ensuring the basic printing requirement, the adaptability and the printing resistance rate of the screen printing plate are improved as much as possible, and the cost of the scraper is reduced.
In the above aspect, the blade having a suitable hardness and a suitable tip in step (2) of the present invention is preferably a 75HSA square-edged blade.
Preferably, in step (3), the selection principle of the scraper pressure and the equipment operating air pressure is as follows: the minimum printing pressure is used as far as possible in order to meet the printing requirements.
Preferably, in the step (3), the pressure of the scraper and the operating air pressure of the equipment are 6-8 bar.
Preferably, in the step (4) of the present invention, the relationship between the intersection angle of the doctor blade and the screen and the ink deposition amount is: the larger the angle is, the smaller the ink discharging amount is, and the smaller the angle is, the larger the ink discharging amount is; the selection principle is as follows: in order to meet the printing requirements, the smallest possible ink drop is used, i.e. the largest possible angle is selected.
Preferably, in the above technical means, in the step (4) of the present invention, an intersection angle between the squeegee and the screen is preferably 70 °.
As a preferable aspect of the above technical solution, the process of troubleshooting in step (5) of the present invention is: firstly, checking whether a screen printing plate is damaged by drawing, and repairing if the screen printing plate is damaged by drawing; checking whether the ink has slag points, and if so, removing the slag points; and then checking the edge smoothness of the scraper by using a finger, judging whether the scraper has defects, and if so, re-grinding the scraper skin to eliminate the defects on the scraper skin.
Preferably, in step (6) of the present invention, the ink viscosity mainly refers to the degree of ink drying and thinning.
Preferably, in the step (6) of the present invention, the leveling time is a time period from the transfer of the ink to the printing material to the drying and curing, and is also a self-running time after the transfer of the ink to the printing material.
Preferably, in step (6) of the present invention, the principle of adjusting the viscosity of the ink to control the leveling time is as follows: auxiliary materials such as a matched diluent and the like are added into the original ink according to a proportion to adjust the viscosity of the ink, the leveling time of the ink with thick viscosity is long, the leveling time of the ink with thin viscosity is short, and the viscosity of the ink meets both the printing effect and the production requirement; too short leveling time can cause the problems of unsmooth printing surface, jagged line edges, intermittent and non-continuous shapes and the like; too long leveling time can cause the loss of fine lines, blurred pictures and texts, narrow line gap width and other problems.
The invention has the beneficial effects that: the influence of parameters such as a scraper, printing pressure, ink feeding amount and the like on the moire is comprehensively considered, and a complete set of scheme for reducing the moire is provided from aspects such as the selection of the hardness of the scraper and a cutter head, the selection of the printing pressure, the selection of the intersection angle of the scraper and a screen printing plate and the like, so that the printing cost is reduced, the printing effect is improved, and the possibility of moire appearing in the screen printing is greatly reduced; the 75HSA square head scraper which is preferably selected from scrapers with various hardness and cutter heads has moderate hardness, two cutting edges can be used, the grinding is convenient, the service life of the scraper is long, and the scraper can almost adapt to all screen printing plates; the intersection angle of the printing pressure of 6-8 bar and 70 degrees is preferably selected from a large number of experimental parameters, so that the forming factor of moire is reduced, the service life of the screen printing plate can be prolonged, the production operation efficiency is improved, and the use cost of ink is reduced; meanwhile, a set of printing faults are detected by observing the print on the screen printing plate, and fault elimination is carried out on three aspects of whether the screen printing plate is damaged by drawing, whether slag points exist in the printing ink and whether the scraper is damaged, so that effective printing is guaranteed. The printing effect is further optimized from the aspects of ink viscosity and leveling time, and the possibility of moire is reduced.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a flow chart of the fault detection and elimination in step (5) of the present invention.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
Example 1
Firstly, selecting ink with proper viscosity according to printing requirements; selecting a 75HSA square head scraper according to the material and the flatness of the screen; secondly, selecting the scraper pressure and the equipment operation air pressure to be 5 bar, trying to scrape once, and uniformly adjusting the scraper pressure to be 7.5 bar at two sides according to the imprinting condition formed by the scraper and the printing ink to meet the printing requirement; then, selecting an intersection angle of the scraper and the screen printing plate as 55 degrees for printing; observing obvious linear marks on the screen printing plate, which are consistent with the running direction of a screen printing plate scraper, in the printing process, checking the screen printing plate, finding that no silking is damaged, then checking the printing ink, finding that no slag point exists in the screen printing plate, then checking the edge smoothness condition of the scraper by using fingers, finding that the scraper is defective, re-grinding the scraper skin, and continuously printing after eliminating the defective marks on the scraper skin; after the printing operation is finished, carefully observing the leveling process and the leveling time of the ink, controlling the leveling time by adjusting the viscosity of the ink according to the printing result, and optimizing the printing effect.
Example 2
Firstly, selecting ink with proper viscosity according to printing requirements; selecting a 75HSA square head scraper according to the material and the flatness of the screen; secondly, selecting the scraper pressure and the equipment operation air pressure to be 10bar, trying to scrape once, and uniformly adjusting the scraper pressure at two sides to be 7.6 bar according to the imprinting condition formed by the scraper and the printing ink so as to meet the printing requirement; then, the intersection angle of the scraper and the screen printing plate is selected to be 85 degrees, and printing is carried out; observing obvious linear marks on the screen printing plate, which are consistent with the running direction of a screen printing plate scraper, in the printing process, checking the screen printing plate, finding that no silking is damaged, then checking the printing ink, finding that no slag point exists in the screen printing plate, then checking the edge smoothness condition of the scraper by using fingers, finding that the scraper is defective, re-grinding the scraper skin, and continuously printing after eliminating the defective marks on the scraper skin; after the printing operation is finished, carefully observing the leveling process and the leveling time of the ink, controlling the leveling time by adjusting the viscosity of the ink according to the printing result, and optimizing the printing effect.
Example 3
Firstly, selecting ink with proper viscosity according to printing requirements; selecting a 75HSA square head scraper according to the material and the flatness of the screen; secondly, selecting the scraper pressure and the equipment operation air pressure to be 7.5 bar, trying to scrape once, and uniformly adjusting the scraper pressure at two sides to be 8 bar according to the imprinting condition formed by the scraper and the printing ink so as to meet the printing requirement; then, selecting the intersection angle of the scraper and the screen printing plate as 70 degrees for printing; observing obvious linear marks on the screen printing plate, which are consistent with the running direction of a screen printing plate scraper, in the printing process, checking the screen printing plate, finding that no silking is damaged, then checking the printing ink, finding that no slag point exists in the screen printing plate, then checking the edge smoothness condition of the scraper by using fingers, finding that the scraper is defective, re-grinding the scraper skin, and continuously printing after eliminating the defective marks on the scraper skin; after the printing operation is finished, carefully observing the leveling process and the leveling time of the ink, controlling the leveling time by adjusting the viscosity of the ink according to the printing result, and optimizing the printing effect.
Claims (4)
1. A method for preventing moire fringes in a printing process during screen printing of flat paper is characterized by comprising the following steps:
(1) selecting ink with proper viscosity according to printing requirements;
(2) selecting a scraper with proper hardness and cutter head according to the material and the flatness of the screen printing plate; the scraper with proper hardness and cutter head is a 75HSA square head scraper;
(3) selecting scraper pressure and equipment operating air pressure to be 5-10bar, trying to scrape once, and uniformly adjusting the scraper pressure at two sides according to the imprinting condition formed by the scraper and the printing ink until the printing requirement is met;
(4) selecting the intersection angle of the scraper and the screen printing plate to be 55-85 degrees, and printing; the relationship between the intersection angle of the scraper and the screen printing plate and the ink discharging amount is as follows: the larger the angle is, the smaller the ink discharging amount is, and the smaller the angle is, the larger the ink discharging amount is; the selection principle is as follows: under the condition of meeting the printing requirements, the minimum ink discharging amount is used as much as possible, namely, the maximum angle is selected as much as possible;
(5) detecting printing faults by checking prints on the screen printing plate in the printing process, and if obvious linear prints consistent with the running direction of a screen printing plate scraper are found, indicating that the prints are faulty, and performing fault elimination; the fault removing process comprises the following steps: firstly, checking whether a screen printing plate is damaged by drawing, and repairing if the screen printing plate is damaged by drawing; checking whether the ink has slag points, and if so, removing the slag points; then, the edge smoothness of the scraper is checked by fingers, whether the scraper is defective or not is judged, if yes, the scraper skin is ground again, and the defect mark on the scraper skin is eliminated;
(6) after the printing operation is finished, carefully observing the leveling process and the leveling time of the ink, controlling the leveling time by adjusting the viscosity of the ink according to the printing result, and optimizing the printing effect; the principle of adjusting the viscosity of the ink and controlling the leveling time is as follows: the auxiliary materials matched with the raw ink are added into the raw ink according to the proportion to adjust the viscosity of the ink, the leveling time of the ink with thick viscosity is long, the leveling time of the ink with thin viscosity is short, and the viscosity of the ink meets both the printing effect and the production requirement.
2. A method of providing moir é prevention during printing in the screen printing of flat paper as claimed in claim 1, wherein: the selection principle of the scraper with proper hardness and cutter head in the step (2) is as follows: on the premise of ensuring the basic printing requirement, the adaptability and the printing resistance rate of the screen printing plate are improved as much as possible, and the cost of the scraper is reduced.
3. A method of providing moir é prevention during printing in the screen printing of flat paper as claimed in claim 1, wherein: the selection principle of the scraper pressure and the equipment operation air pressure in the step (3) is as follows: the minimum printing pressure is used as far as possible in order to meet the printing requirements.
4. A method of providing moir é prevention during printing in the screen printing of flat paper as claimed in claim 1, wherein: too short leveling time can cause the problems of unsmooth printing surface, jagged line edges and discontinuous and non-continuous shapes; too long leveling time can cause the loss of fine lines, blurred pictures and texts and narrow line gap width.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710576005.2A CN107160834B (en) | 2017-07-14 | 2017-07-14 | Method for preventing moire in printing process during screen printing of flat paper |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710576005.2A CN107160834B (en) | 2017-07-14 | 2017-07-14 | Method for preventing moire in printing process during screen printing of flat paper |
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| CN107160834A CN107160834A (en) | 2017-09-15 |
| CN107160834B true CN107160834B (en) | 2020-03-27 |
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| CN109933004B (en) * | 2019-03-27 | 2022-05-24 | 苏芯物联技术(南京)有限公司 | Machine tool fault diagnosis and prediction method and system based on edge computing and cloud cooperation |
| CN110757946A (en) * | 2019-10-17 | 2020-02-07 | 晋能清洁能源科技股份公司 | Scraper device suitable for solar cell screen printing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106068313A (en) * | 2015-01-27 | 2016-11-02 | 帝国油墨制造股份公司 | High-quality fine silk screenink compositions, the printed article of this ink composite of silk screen printing and the manufacture method of this printed article |
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| US8939073B2 (en) * | 2012-02-08 | 2015-01-27 | Illinois Tool Works Inc. | Print head for stencil printer |
| CN102582341B (en) * | 2012-02-09 | 2013-08-14 | 无锡市科虹标牌有限公司 | Polycarbonate (PC) decorative board printed with three-dimensional image and printing process of PC decorative board |
| CN105555034A (en) * | 2016-02-02 | 2016-05-04 | 东莞翔国光电科技有限公司 | Process of plugging holes in printed circuit board with ink |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106068313A (en) * | 2015-01-27 | 2016-11-02 | 帝国油墨制造股份公司 | High-quality fine silk screenink compositions, the printed article of this ink composite of silk screen printing and the manufacture method of this printed article |
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