Whether engaged in offset printing, digital printing or flexographic printing, printers are seeking various ways to improve and simplify production processes in order to cope with the ever-shrinking profit margins. One way is to ensure that the finished products obtained by customers can meet their expectations to avoid re-production and re-printing. This means that an accurate, high-quality contract proofing is critical.
Proofing has always been a headache in flexographic printing. Some people may say that the best way to show the finished product to customers is to print it directly. However, this method is not very easy to implement, not only the cost is higher, but the cycle is longer. When using other printing processes, you can usually use relatively simple inkjet proofing to simulate the actual printing effect. Flexographic printing is special. The dot expansion rule and screen angle are different from other printing methods. In addition, spot color and metallic printing are also widely used in flexographic printing.
Therefore, for flexographic printing, the required technical conditions are relatively high. Printers should have a RIP that can drive accurate and reliable output devices. The RIP of the professional flexographic printing proofing system can reproduce the flexographic printing effect involving many variables, and then output an image with the quality stipulated in the contract to the proofing machine. The quality of proofing is very important. The proofing quality of Epson equipment is unmatched, so it has the largest share in the proofing market. Epson recently launched four new 8-color printers, namely Stylus Pro 4880, 7880, 9880 and 11880. These four printers all use UltraChrome K3 technology with vivid magenta ink that can improve the image effect. The print head also uses the award-winning MicroPiezo (micro piezoelectric) technology, which also ensures that high-quality proofs are printed at a relatively reasonable cost.
The problem often encountered when performing flexographic printing proofing is that the main printing material used in the proofing process is white paper, and this material is rarely used in the final products of the flexographic printing market. The only way to get real proofing on actual materials is to perform wet proofing, which is beyond the cost of many printers. The alternative technology is the use of specially developed technology, with high-standard inkjet proofing machine can accurately reproduce the true printing effect.
The FlexoProof system from GMG can reproduce the proofing effect of actual printing materials, such as corrugated cardboard. In fact, any low-quality paper can be simulated by changing the image noise. GMG ’s products have always supported Epson ’s Stylus Pro printers, taking full advantage of the transparency and density of the UltraChrome K3 ink system, and the accuracy of micro-piezo print head technology, which has ultra-fine dots (UltraMicro Dot ) The accuracy of inkjet.
The StarProof system from Compose System Company solved the complicated problem of dot structure by analyzing the shape and screen angle of CMYK dots. This analysis is provided by the Actual Dot system, which can reproduce the original screening and dot shape with proofing resolution. When sent to a high-resolution printer, such as Epson Stylus Pro4880, it can output high-quality proofs with sharp dots, clear images, accurate colors, and fine levels.
The screen dots of the flexographic version usually need to adjust the height or width of the dots slightly to compensate for the dot expansion during printing. The StarProof "Dot Distortion" tool can generate the correct screening dots based on the deformation ratio or expansion ratio of the original under user control, and expand the deformed dots to the original correct size. StarProof can also compensate for the loss of small dots during flexographic transfer during the printing process. By inputting the size value of "Dot Lost", the screen dots smaller than this size will be removed and will not appear on the proof sheet, which is in line with the actual situation of printing.
Most Rip processes spot colors in the same way, that is, through software analysis, the spot colors are converted to the closest CMYK value. OpenRIP Flexo from Advanced Proofing of Xante can print composite or specific colors for printer proofing and customer proofing. It is also possible to change the spot color during Rip, which can reduce the amount of ink required for overprinting, and at the same time preview the effects of limited printing, overprinting and hollowing out. OpenRIP uses the KoolKolor inkjet proofing technology for ICC color management and the color management file of the target device to simulate the final printed product.
GMG's FlexoProof supports all standard spot color systems, such as Hexachrome or Pantone spot color libraries. These standard spot color systems are provided with the product. An image can be divided into 64 colors at most, and the total color separation of a printing variety is not limited. These colors are stored in the database, and users can add colors to the database as needed. With the FlexoProof solution, color opacity and related printing order can be specified as needed, and even the white base can be specified as a spot color.
The problems of early screening can also be solved through GMG's FlexProof. In addition to processing almost all industry-standard prepress data formats, FlexoProof can also process the final 1-bit data, such as the data obtained by CTP RIP. These data are the color information that was originally reserved for color management, not the information to go to the network. This allows early detection of discontinuous tones, moire, and trapping errors before exposure of the printing plate.
RIP can output high-quality effects is a problem, the final proofing effect may be another matter. If the color exceeds the color gamut, the proofs will be completely different from the imagination. The proofer needs to be able to output the changes made by the proofing system. Epson's large format printers have a good reputation for color performance, thanks to the outstanding performance of UltraChrome K3 ink, which has a certain water resistance, can quickly dry after printing and has excellent light resistance. Unlike the traditional use of a single black, Epson UltraChromeK3 ink uses three different concentrations of black ink to achieve a more stable and accurate grayscale balance, and uses less color ink to achieve more accurate color control. Coupled with a print resolution of up to 2880x1440dpi, it can perfectly match the output effect of RIP.
Although professional Rip suppliers such as GMG, Xante and Compose System have made great progress in technology, coupled with the cooperation of Epson inkjet printers, flexographic printing proofing technology has taken a big step forward, but flexographic proofing still Not perfect. Through high-quality contract proofing, the gap between proofs and finished products is gradually narrowing. The closer the proofs output by the proofing equipment and the final product, the happier the customer will be.
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