Digital printing technology has revolutionized the process of printing plate making and printing. It has taken away part of the screen printing market, but digital printing cannot replace screen printing because the screen printing materials are very extensive and there is “universal printingâ€. It is said that it has the advantage that other printing cannot be replaced, especially in the electronics industry.
At present, screen printing is a very common printing process. It is a method that can be printed on various shapes and materials, and it has been developed globally due to its wide range of applications. Due to the rapid development and development of screen printing printing materials and extensive and printing machinery, inks and other consumables, screen printing and plain printing are performed. The gravure and embossing (flexo) competition played an advantage.
Digital printing is stressless printing. It cannot replicate all screen-printed products, nor can it meet the needs of all users. However, digital printing will promote the development of screen printing without any doubt. Taken together, the performance in the following few areas is particularly evident:
First, direct digital imaging and screen printing
Although the use of projection exposure for photopolymer emulsion screens has become a new technology currently in use, an updated screen printing plate technology, direct digital imaging, will bring a major breakthrough to screen plate making.
Direct digital imaging uses existing precision computer technology to control the wax injection system and scan the screen version with a modulated scan head.
Direct scanning of the original, computer-aided design, or information already stored on disk can be made using computer input. Unlike the projection method, the template is a full-size scan, the number of dots does not decrease, and the resolution depends on the laser beam focusing. The diameter of the laser beam can be large or small, usually 20μ, and a screen dot with a dot size of 5μ can be used to print a 120μ line screen printing plate.
Traditional color screen printing color separation screen production, can not be separated from film (photosensitive bottom plate), especially in the face of super-large screen printing, is nothing more than the use of film imposition, enlarge film or casting screen version. Either way, it must be based on the premise that high-precision, high-line film film production. Splicing a film is not only expensive, but it is difficult to ensure that it does not reveal stitching marks. Zooming in on the film and the screen printing net, due to the constraints of image factors, lens spheres, and other objective factors, caused a lot of trouble for the actual production, making it difficult to control the quality of the screen. Tongli Wire Mesh Production Technology Development Co., Ltd. introduced the Luscher JetScreen screen printer from Switzerland on the basis of the original computer color separation and platemaking system. The image was directly drawn on the photosensitive screen, which was combined into a set of fully functional color. Screen printing color separation template production system. The system makes screen printing color screens as easy to operate as computer inkjets. In the process of screen printing, the system does not require film film, saves time and money, eliminates the need for vacuum adsorption, saves equipment, eliminates sand holes formed by scratches or dust on the glass, and completely avoids the collision of mesh points with yarns. The moiré produced by the net has a print resolution of 630 dpi and resolution of the screen (repetition accuracy) of 0.02 mm. JetScreen's bottomless plate making system will enable color screen printing screen printing technology to enter a new era, enabling the design of large-format screen printing that could not be achieved in the past. The latest short-cut wax-jet printer can spray 3 x 8 (m) patterns.
Process flow: The system is free to read in the customer's own or design the desired pattern by various means; or after completing the plate making, any kind of media can be used to store the image data. The screening angles of yellow, blue, green, and black are different when screened. The number of screens and the number of screen meshes are also different. There are matching storages in the computer, such as 22.5°, 85.5°, and 112.5°. .
Regarding the computer-to-silk screen image transfer time, if a 65-line/inch prismatic dot screen is used, the resolution is 633×633 dpi, the printing area is 1 square meter, and the transfer time is 20 minutes. For lower line counts, for example, 38 lines/inch or 50 lines/inch screen resolution, the resolution is reduced, and the image conversion time is much faster. The printing area of ​​1 square meter is only 15 minutes. A slight decrease in resolution does not affect the image quality because the viewing distance must be at least 1 meter. In general, the resolution of digital printing is not higher than 600 dpi.
The imaging speed is for a printing area of ​​1000 mm×1000 mm (ie, 1 square meter). If the printing area is 1230 mm×820 mm, although it is a rectangle, the actual area is still 1 square meter, so the imaging speed does not change. The imaging speed of the portrait part is higher than that of the landscape because the head moves up and down faster than the lateral speed.
Digital screening printing technology includes the latest random screening, FM screening technology. Imaging is much faster than using a traditional screen. When selecting the imaging speed, the operator can adjust the image fineness, color value, viewing distance, and print size. Obviously, the lower the number of screen lines, the faster the nozzle moves on the template.
During the operation of the system, a hot melt wax is sprayed onto the stencil by the spray head. The optical density of the hot melt wax is higher than 3.0. It contains a special UV blocking agent to prevent the UV light from being emitted when exposed. When the nozzle sprays the image onto the stencil, the image immediately hardens, dries, and adheres tightly to the stencil to prevent sidewall corrosion during exposure. The hot melt storage will not see the seepage phenomenon, nor will it affect the subtle level of fineness of the image. The imaged template can also be stored for a period of time before exposure, without affecting the image quality.
Water or solvent resistant emulsions and sensitizers in stencil emulsions can be used. Smooth surface energy can be achieved for direct stencils, capillary sensitized films, and film/emulsion systems. The lower the Rz value, the finer the image.
The plate making process of the computer-to-plate system not only allows the image to be uniformly sprayed, but also has rich subtle layers, clear edges, and a long service life of the template. At the same time, all printing inks, especially water-based UV inks, can be used. It is worth mentioning that the computer-to-plate system has a more realistic and natural effect on the reproduction of skin tones.
Compared with projection platemaking, direct digital imaging platemaking has many advantages. It is technically more advanced. A printing plate can be made in one step, completely eliminating the use of silver salt film, thus eliminating the environment brought by washing chemicals. Pollution. Computer-aided design data can be directly transmitted to the template without intermediate photographic steps. The digitized image scanner can directly input the original image to drive the laser imaging of the screen plate. The sharpness of the image depends on the focusing of the laser beam, and the laser light of 5 to 20μ. Beams are relatively easy to reach.
At present, the screen direct digital imaging system equipment has been sold in Beijing Tongli Company, including: microcomputers; high-quality digital image scanners; software programs that generate digital data; and lasers whose spectral output is close to the ultraviolet range.
Screen-printing digital plate-making technology is the latest plate-making method for photosensitive screen printing plates and has been put into commercial use. This plate-making method uses less energy to expose and harden the photosensitive layer of the screen plate. Its emergence and application have brought about fundamental changes to the traditional screen printing plate making process, marking that the screen plate making technology has begun to enter a new stage of digitization.
Second, digital printing and screen printing
1. Digital Printing and Screen Printing Advertising
In recent years, the term digital printing has become more and more familiar, and digital printing has become more and more widely used. From colorful and colorful light box advertisements to colorful body advertisements, there is no shortage of digital printing technology.
(1) Although digital printing technology has entered the market for only a few years, it has been developing rapidly. Can be divided into: color inkjet printers, large computer inkjet printers, electrostatic printers (also known as computer photo system).
Color ink-jet printers are characterized by cheaper prices and higher precision, but most of them use water-soluble inks. Because inks and consumables have poor weatherability, they are suitable for indoor use. Compared with other printing technologies, this type of printer has a slower speed and there are certain difficulties in mass production.
The main feature of a large-scale computer sprayer is that it has a large print size, typically up to 5 meters in width, and most of these machines use a spray gun structure, with a four-color spray gun to spray ink directly on the substrate. However, the clarity of this kind of machine is relatively low, generally between 9 and 18 (dpi) on average, the screen made is suitable for long-distance viewing, poor viewing at close quarters.
Electrostatic printers, also known as computer photo systems, are painting systems that use electrostatic principles. The main features of this type of printing press are its high accuracy, up to 400 dpi, fast speed, color saturation and layering, and it can be used indoors and outdoors.
(2) Screen printing advertisements are different from film and television. Radio and periodical advertisements have various forms, such as outdoor poster advertisements, light box advertisements, body advertisements, banner advertisements, inflatable advertisements, banner advertisements, storefront advertisements, and the like. The above advertisements have their common features.
Screen printing advertisements are often large-format, generally full-sheet size, and the largest screen in practical use is 3.8m×8m. Screen printing advertisements are mostly used for outdoor posting and are placed in the eye-catching places of people's activity space, deliberately catering to the flow of people. The visual effects; the materials used in screen printing advertisements are relatively heavy, and some even become three-dimensional. Many advertisements are printed on stickers, light boxes, plastic sheets, glass, or other plates, and some are made into three-dimensional advertisements.
From the types and characteristics of screen printing ads mentioned above, it can be seen that other advertising media can hardly replace its position. When the development of online media is in full swing today, screen printing advertisements that are active in the direct space environment of people's daily lives have strong vitality.
2. Digital printing and screen printing
(1) Fabric jet printing is a new technology that has been developing rapidly for the past 10 years and is the most challenging traditional printing technology. Its basic principle is to pass a pigmented ink under pressure or piezoelectricity in accordance with a predetermined array. The nozzle is continuously sprayed onto the printed fabric, and the process of forming the pattern by the computer color separation system is also called non-contact non-contact printing or digital printing. Compared with the traditional printing method, it has the following advantages: abolishing the complex screen-making process; saving a lot of screen printing plate materials and equipment; wide chromatographic, no restrictions on the number of sets; the entire production process is in line with the "green" of the 21st century theme. However, the current problems in digital printing are low speed, expensive ink, and high cost.
(2) The European Association of Screen Printing Associations (FESPA) held a digital printing research conference in Barcelona, ​​Spain in 1999. Most people no longer see digital printing as a threat to fabric printing, but as an opportunity. Think that "the success of digital inkjet printing system will be a revolution in the printing industry."
The emergence of digital printing has a special significance for the printing of different textiles, especially for wide-format digital image printing, which makes up for the lack of screen printing.
(3) Over the years, screen printing has adopted advanced technologies such as computer color separation, laser plate making, and wax-jet plate making. It has greatly improved in adapting to high-quality, small-batch, multi-species, and fast delivery. The current large number of screen printing has the advantage of digital printing.
With the continuous improvement of people’s living standards, the popular cycle of fabric patterns and clothing styles is getting shorter and shorter. With the individualization and fashion of clothing, the variety of clothing and fashion colors and the small amount of printing have become the development trend. To this end, textiles, clothing, printing and dyeing, dyes, auxiliaries and other production. Design and research institutes should pay attention to all kinds of digital printing information, make timely decisions, and develop domestic digital printing machines and related inks, dyes and additives as soon as possible.
In short, digital printing and screen printing have both a competitive side and a complementary side. Screen printers should seize the opportunity to use digital technology to develop screen printing and meet the challenges.
At present, screen printing is a very common printing process. It is a method that can be printed on various shapes and materials, and it has been developed globally due to its wide range of applications. Due to the rapid development and development of screen printing printing materials and extensive and printing machinery, inks and other consumables, screen printing and plain printing are performed. The gravure and embossing (flexo) competition played an advantage.
Digital printing is stressless printing. It cannot replicate all screen-printed products, nor can it meet the needs of all users. However, digital printing will promote the development of screen printing without any doubt. Taken together, the performance in the following few areas is particularly evident:
First, direct digital imaging and screen printing
Although the use of projection exposure for photopolymer emulsion screens has become a new technology currently in use, an updated screen printing plate technology, direct digital imaging, will bring a major breakthrough to screen plate making.
Direct digital imaging uses existing precision computer technology to control the wax injection system and scan the screen version with a modulated scan head.
Direct scanning of the original, computer-aided design, or information already stored on disk can be made using computer input. Unlike the projection method, the template is a full-size scan, the number of dots does not decrease, and the resolution depends on the laser beam focusing. The diameter of the laser beam can be large or small, usually 20μ, and a screen dot with a dot size of 5μ can be used to print a 120μ line screen printing plate.
Traditional color screen printing color separation screen production, can not be separated from film (photosensitive bottom plate), especially in the face of super-large screen printing, is nothing more than the use of film imposition, enlarge film or casting screen version. Either way, it must be based on the premise that high-precision, high-line film film production. Splicing a film is not only expensive, but it is difficult to ensure that it does not reveal stitching marks. Zooming in on the film and the screen printing net, due to the constraints of image factors, lens spheres, and other objective factors, caused a lot of trouble for the actual production, making it difficult to control the quality of the screen. Tongli Wire Mesh Production Technology Development Co., Ltd. introduced the Luscher JetScreen screen printer from Switzerland on the basis of the original computer color separation and platemaking system. The image was directly drawn on the photosensitive screen, which was combined into a set of fully functional color. Screen printing color separation template production system. The system makes screen printing color screens as easy to operate as computer inkjets. In the process of screen printing, the system does not require film film, saves time and money, eliminates the need for vacuum adsorption, saves equipment, eliminates sand holes formed by scratches or dust on the glass, and completely avoids the collision of mesh points with yarns. The moiré produced by the net has a print resolution of 630 dpi and resolution of the screen (repetition accuracy) of 0.02 mm. JetScreen's bottomless plate making system will enable color screen printing screen printing technology to enter a new era, enabling the design of large-format screen printing that could not be achieved in the past. The latest short-cut wax-jet printer can spray 3 x 8 (m) patterns.
Process flow: The system is free to read in the customer's own or design the desired pattern by various means; or after completing the plate making, any kind of media can be used to store the image data. The screening angles of yellow, blue, green, and black are different when screened. The number of screens and the number of screen meshes are also different. There are matching storages in the computer, such as 22.5°, 85.5°, and 112.5°. .
Regarding the computer-to-silk screen image transfer time, if a 65-line/inch prismatic dot screen is used, the resolution is 633×633 dpi, the printing area is 1 square meter, and the transfer time is 20 minutes. For lower line counts, for example, 38 lines/inch or 50 lines/inch screen resolution, the resolution is reduced, and the image conversion time is much faster. The printing area of ​​1 square meter is only 15 minutes. A slight decrease in resolution does not affect the image quality because the viewing distance must be at least 1 meter. In general, the resolution of digital printing is not higher than 600 dpi.
The imaging speed is for a printing area of ​​1000 mm×1000 mm (ie, 1 square meter). If the printing area is 1230 mm×820 mm, although it is a rectangle, the actual area is still 1 square meter, so the imaging speed does not change. The imaging speed of the portrait part is higher than that of the landscape because the head moves up and down faster than the lateral speed.
Digital screening printing technology includes the latest random screening, FM screening technology. Imaging is much faster than using a traditional screen. When selecting the imaging speed, the operator can adjust the image fineness, color value, viewing distance, and print size. Obviously, the lower the number of screen lines, the faster the nozzle moves on the template.
During the operation of the system, a hot melt wax is sprayed onto the stencil by the spray head. The optical density of the hot melt wax is higher than 3.0. It contains a special UV blocking agent to prevent the UV light from being emitted when exposed. When the nozzle sprays the image onto the stencil, the image immediately hardens, dries, and adheres tightly to the stencil to prevent sidewall corrosion during exposure. The hot melt storage will not see the seepage phenomenon, nor will it affect the subtle level of fineness of the image. The imaged template can also be stored for a period of time before exposure, without affecting the image quality.
Water or solvent resistant emulsions and sensitizers in stencil emulsions can be used. Smooth surface energy can be achieved for direct stencils, capillary sensitized films, and film/emulsion systems. The lower the Rz value, the finer the image.
The plate making process of the computer-to-plate system not only allows the image to be uniformly sprayed, but also has rich subtle layers, clear edges, and a long service life of the template. At the same time, all printing inks, especially water-based UV inks, can be used. It is worth mentioning that the computer-to-plate system has a more realistic and natural effect on the reproduction of skin tones.
Compared with projection platemaking, direct digital imaging platemaking has many advantages. It is technically more advanced. A printing plate can be made in one step, completely eliminating the use of silver salt film, thus eliminating the environment brought by washing chemicals. Pollution. Computer-aided design data can be directly transmitted to the template without intermediate photographic steps. The digitized image scanner can directly input the original image to drive the laser imaging of the screen plate. The sharpness of the image depends on the focusing of the laser beam, and the laser light of 5 to 20μ. Beams are relatively easy to reach.
At present, the screen direct digital imaging system equipment has been sold in Beijing Tongli Company, including: microcomputers; high-quality digital image scanners; software programs that generate digital data; and lasers whose spectral output is close to the ultraviolet range.
Screen-printing digital plate-making technology is the latest plate-making method for photosensitive screen printing plates and has been put into commercial use. This plate-making method uses less energy to expose and harden the photosensitive layer of the screen plate. Its emergence and application have brought about fundamental changes to the traditional screen printing plate making process, marking that the screen plate making technology has begun to enter a new stage of digitization.
Second, digital printing and screen printing
1. Digital Printing and Screen Printing Advertising
In recent years, the term digital printing has become more and more familiar, and digital printing has become more and more widely used. From colorful and colorful light box advertisements to colorful body advertisements, there is no shortage of digital printing technology.
(1) Although digital printing technology has entered the market for only a few years, it has been developing rapidly. Can be divided into: color inkjet printers, large computer inkjet printers, electrostatic printers (also known as computer photo system).
Color ink-jet printers are characterized by cheaper prices and higher precision, but most of them use water-soluble inks. Because inks and consumables have poor weatherability, they are suitable for indoor use. Compared with other printing technologies, this type of printer has a slower speed and there are certain difficulties in mass production.
The main feature of a large-scale computer sprayer is that it has a large print size, typically up to 5 meters in width, and most of these machines use a spray gun structure, with a four-color spray gun to spray ink directly on the substrate. However, the clarity of this kind of machine is relatively low, generally between 9 and 18 (dpi) on average, the screen made is suitable for long-distance viewing, poor viewing at close quarters.
Electrostatic printers, also known as computer photo systems, are painting systems that use electrostatic principles. The main features of this type of printing press are its high accuracy, up to 400 dpi, fast speed, color saturation and layering, and it can be used indoors and outdoors.
(2) Screen printing advertisements are different from film and television. Radio and periodical advertisements have various forms, such as outdoor poster advertisements, light box advertisements, body advertisements, banner advertisements, inflatable advertisements, banner advertisements, storefront advertisements, and the like. The above advertisements have their common features.
Screen printing advertisements are often large-format, generally full-sheet size, and the largest screen in practical use is 3.8m×8m. Screen printing advertisements are mostly used for outdoor posting and are placed in the eye-catching places of people's activity space, deliberately catering to the flow of people. The visual effects; the materials used in screen printing advertisements are relatively heavy, and some even become three-dimensional. Many advertisements are printed on stickers, light boxes, plastic sheets, glass, or other plates, and some are made into three-dimensional advertisements.
From the types and characteristics of screen printing ads mentioned above, it can be seen that other advertising media can hardly replace its position. When the development of online media is in full swing today, screen printing advertisements that are active in the direct space environment of people's daily lives have strong vitality.
2. Digital printing and screen printing
(1) Fabric jet printing is a new technology that has been developing rapidly for the past 10 years and is the most challenging traditional printing technology. Its basic principle is to pass a pigmented ink under pressure or piezoelectricity in accordance with a predetermined array. The nozzle is continuously sprayed onto the printed fabric, and the process of forming the pattern by the computer color separation system is also called non-contact non-contact printing or digital printing. Compared with the traditional printing method, it has the following advantages: abolishing the complex screen-making process; saving a lot of screen printing plate materials and equipment; wide chromatographic, no restrictions on the number of sets; the entire production process is in line with the "green" of the 21st century theme. However, the current problems in digital printing are low speed, expensive ink, and high cost.
(2) The European Association of Screen Printing Associations (FESPA) held a digital printing research conference in Barcelona, ​​Spain in 1999. Most people no longer see digital printing as a threat to fabric printing, but as an opportunity. Think that "the success of digital inkjet printing system will be a revolution in the printing industry."
The emergence of digital printing has a special significance for the printing of different textiles, especially for wide-format digital image printing, which makes up for the lack of screen printing.
(3) Over the years, screen printing has adopted advanced technologies such as computer color separation, laser plate making, and wax-jet plate making. It has greatly improved in adapting to high-quality, small-batch, multi-species, and fast delivery. The current large number of screen printing has the advantage of digital printing.
With the continuous improvement of people’s living standards, the popular cycle of fabric patterns and clothing styles is getting shorter and shorter. With the individualization and fashion of clothing, the variety of clothing and fashion colors and the small amount of printing have become the development trend. To this end, textiles, clothing, printing and dyeing, dyes, auxiliaries and other production. Design and research institutes should pay attention to all kinds of digital printing information, make timely decisions, and develop domestic digital printing machines and related inks, dyes and additives as soon as possible.
In short, digital printing and screen printing have both a competitive side and a complementary side. Screen printers should seize the opportunity to use digital technology to develop screen printing and meet the challenges.
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