Like lithography, flexo platemaking now uses computer-to-plate technology. For example, DuPont has launched the Cyrel Digital Imaging System and Cyrel Digital Flexible Plate.
The traditional flexo platemaking process is: prepress plate making, film printing, printing plate making and so on. In the plate-making process, a special plate-making machine is used to allow the negative- tone film and the plate to be closely adhered. The back-exposure and main exposure, development, and post-exposure processes are also performed. The operation is very complicated and the quality is difficult to grasp. In particular, the tone level of the image may also be lost. The use of flexo and direct platemaking can also greatly improve work efficiency, eliminate the consumption of film, save materials, and at the same time greatly improve the quality of plate making, so that the image of the network point reproduction.
First, the structure of the flexographic printing plate
The structure of the flexo-printing plate, as shown in Fig. 1, consists of a resin base, a photosensitive resin layer, and a black laser absorbing layer on the photosensitive layer. The photosensitive resin layer and the photosensitive resin plate of the common photosensitive resin plate are the same, and the black laser absorbing layer can be ablated by the laser.
Second, the principle of plate making with flexo plate
At the time of plate making, an infrared laser beam emitted from a plate-making machine image generator was first used to ablate the black absorbing layer of the graphic portion, exposing the underlying photosensitive resin layer. Since the photopolymerizable photosensitive layer is insensitive to infrared rays, the place where the photosensitive emulsion layer is ablated by the laser is not affected by the infrared laser.
After laser ablation, the plate can be fully exposed. The black coating remained in the blank space of the printing plate to block the light, so that the photosensitive layer in the blank space is not sensitive to light; and the photosensitive layer at the graphic place is protected from photopolymerization due to the loss of the protection of the black coating. Graphic part. After exposure, general digital flexographic printing plates can be developed in the usual way, ie solvent rinsing, drying, and finishing. However, some digital flexo plates require that the black coating be rinsed with water before it is rinsed with solvent.
Third, flexo printing plate making machine
The principles and structure of the laser image-setter for digital flexo platesetter and film output are somewhat similar. The digital flexo plate-making machine is divided into two modes, the inner drum exposure and the outer drum exposure in the exposure mode. In the inner drum digital flexo platemaking machine, the plate is kept inside the drum during the exposure process; in the outer drum digital flexo plate making machine, the plate is kept outside the drum during the exposure process. When the drum rotates at high speed, the exposure head moves laterally with respect to the drum for exposure. At present, the flexo platesetter is basically an outer drum type, and only small or medium (30in, 40in) platesetters have inner drum type.
Digital flexo platesetters are controlled by a raster image processor (RIP). Raster image processor (RIP) is hardware or software that interprets data from the front end of a computer and sends it to a laser imagesetter . The interpretation language of the RIP of the inner cylinder digital flexo platesetter is the Postscript language. Its job tasks and principles are the same as Postscript laser imagesetters. It describes and interprets the content of the page sent by the application program, forms a bitmap image, and controls the digital flexo plate-making machine to perform laser ablation and record the page information on the plate.
The raster image processor consists of two parts: the interpretation part and the control part. The interpretation part receives the page information from the computer and encodes it for use by the control part; the control part controls the operation of the imaging system.
Fourth, digital flexo version of the application
At the time of loading, due to the expansion and contraction of the printing plate, the height of small dots that are originally equal to the actual area will be reduced. Therefore, before the plate making, this factor must be taken into account in order to improve the balance between the high light area and the printing pressure in the field.
The primary issue facing flexo direct platemaking today is the issue of price. Whether it is plate making equipment, proofing systems or digital flexographic plates, the price is higher than that of conventional flexo. However, digital platemaking eliminates the processing of developing and fixing films and films, eliminating the need for various types of chemicals, places for storing films, and vacuum operating procedures for films and plates during printing. These save a certain amount of money. , And the plate making efficiency and printing quality are unmatched by the ordinary printing plate.
One of the main reasons why digital flexo can survive is that it can be used for high quality flexo printing. With the improvement of the quality of digital plates, the economic advantages of flexographic printing will also create favorable conditions for the development of new markets. At the same time, it will provide printing companies and printing customers with more choices so that customers can use the lowest prices. , the best quality to get the desired print.
The traditional flexo platemaking process is: prepress plate making, film printing, printing plate making and so on. In the plate-making process, a special plate-making machine is used to allow the negative- tone film and the plate to be closely adhered. The back-exposure and main exposure, development, and post-exposure processes are also performed. The operation is very complicated and the quality is difficult to grasp. In particular, the tone level of the image may also be lost. The use of flexo and direct platemaking can also greatly improve work efficiency, eliminate the consumption of film, save materials, and at the same time greatly improve the quality of plate making, so that the image of the network point reproduction.
First, the structure of the flexographic printing plate
The structure of the flexo-printing plate, as shown in Fig. 1, consists of a resin base, a photosensitive resin layer, and a black laser absorbing layer on the photosensitive layer. The photosensitive resin layer and the photosensitive resin plate of the common photosensitive resin plate are the same, and the black laser absorbing layer can be ablated by the laser.
Second, the principle of plate making with flexo plate
At the time of plate making, an infrared laser beam emitted from a plate-making machine image generator was first used to ablate the black absorbing layer of the graphic portion, exposing the underlying photosensitive resin layer. Since the photopolymerizable photosensitive layer is insensitive to infrared rays, the place where the photosensitive emulsion layer is ablated by the laser is not affected by the infrared laser.
After laser ablation, the plate can be fully exposed. The black coating remained in the blank space of the printing plate to block the light, so that the photosensitive layer in the blank space is not sensitive to light; and the photosensitive layer at the graphic place is protected from photopolymerization due to the loss of the protection of the black coating. Graphic part. After exposure, general digital flexographic printing plates can be developed in the usual way, ie solvent rinsing, drying, and finishing. However, some digital flexo plates require that the black coating be rinsed with water before it is rinsed with solvent.
Third, flexo printing plate making machine
The principles and structure of the laser image-setter for digital flexo platesetter and film output are somewhat similar. The digital flexo plate-making machine is divided into two modes, the inner drum exposure and the outer drum exposure in the exposure mode. In the inner drum digital flexo platemaking machine, the plate is kept inside the drum during the exposure process; in the outer drum digital flexo plate making machine, the plate is kept outside the drum during the exposure process. When the drum rotates at high speed, the exposure head moves laterally with respect to the drum for exposure. At present, the flexo platesetter is basically an outer drum type, and only small or medium (30in, 40in) platesetters have inner drum type.
Digital flexo platesetters are controlled by a raster image processor (RIP). Raster image processor (RIP) is hardware or software that interprets data from the front end of a computer and sends it to a laser imagesetter . The interpretation language of the RIP of the inner cylinder digital flexo platesetter is the Postscript language. Its job tasks and principles are the same as Postscript laser imagesetters. It describes and interprets the content of the page sent by the application program, forms a bitmap image, and controls the digital flexo plate-making machine to perform laser ablation and record the page information on the plate.
The raster image processor consists of two parts: the interpretation part and the control part. The interpretation part receives the page information from the computer and encodes it for use by the control part; the control part controls the operation of the imaging system.
Fourth, digital flexo version of the application
At the time of loading, due to the expansion and contraction of the printing plate, the height of small dots that are originally equal to the actual area will be reduced. Therefore, before the plate making, this factor must be taken into account in order to improve the balance between the high light area and the printing pressure in the field.
The primary issue facing flexo direct platemaking today is the issue of price. Whether it is plate making equipment, proofing systems or digital flexographic plates, the price is higher than that of conventional flexo. However, digital platemaking eliminates the processing of developing and fixing films and films, eliminating the need for various types of chemicals, places for storing films, and vacuum operating procedures for films and plates during printing. These save a certain amount of money. , And the plate making efficiency and printing quality are unmatched by the ordinary printing plate.
One of the main reasons why digital flexo can survive is that it can be used for high quality flexo printing. With the improvement of the quality of digital plates, the economic advantages of flexographic printing will also create favorable conditions for the development of new markets. At the same time, it will provide printing companies and printing customers with more choices so that customers can use the lowest prices. , the best quality to get the desired print.
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