Soft proofing of numbers in newspapers
The application of digital proofing not only involves the plate-making workshop, printing workshop, but also the advertisers. It can provide advertisers with a contract in the newspaper's advertising department, and build a bridge with customers. Secondly, digital proofing can comprehensively check and control all processes from plate making to printing, and promote the overall improvement of newspaper printing quality. The following uses the proofing software as an example to introduce the application of digital proofing, using the post-RIP proofing method, and the proofing machine is HPDesignjet4000. Before formal proofing, you need to print some test versions, use a colorimeter to measure, correct the color management of the device, and generate the device characteristic curve of the printing machine (ICCProfiles document). The equipment characteristic curve of the proofer is easier to make, but it is more complicated for the printing machine. There are a large number of printing machines in the printing center where the author is located. There are 6 large newspaper rotary printing machines, and they have different brands and different working principles. There are mechanical transmissions and shaftless transmissions. Between the color groups, because the cylinders, blankets, etc. have their own characteristics, the characteristics of different printing machines, different printing color groups, and different cylinders cannot be exactly the same. From the perspective of color management, in theory, the equipment characteristic curve should be done for each printing machine and even each printing color group. For commercial printing, it really should be. However, the quality of newspaper printing is not as precise as that of commercial printing. And for such a large number of devices, if they are carried out one by one, not only is it complicated to generate profile files in the early stage, but in actual production, for different printing equipment, it is necessary to proof different samples. This is time-consuming and laborious, and is undesirable for newspaper printing that requires timeliness. Therefore, in the actual test, we selected a printing machine with a good working condition, normal production and stable quality, and excellent printing quality to make the device characteristic curve. For other machines, we use the printed products of this printing machine to follow color. This not only ensures the consistency of the proofing effect and the actual printing effect, but also ensures that the newspapers printed by multiple devices are basically the same color, and also saves the time of proofing. This fully meets the characteristics and requirements of newspaper printing. After receiving the sample, do not rush to measure it and let it dry naturally for a period of time, because the moisture on the surface of the newspaper is not completely absorbed; nor can it be measured after one day. This result is not accurate. Then use a spectrophotometer to measure the L * a * b * value of the IT8 color scale. It is best to use a spectrophotometer dedicated to color management when measuring. Because the IT8 color scale has 840 color patches, it is very time-consuming to measure one by one with an ordinary spectrophotometer. The dedicated spectrophotometer can be completed quickly in just a few scans, and then the test results are directly passed to the color management software for analysis to generate a printer profile file. The same is true for the proofer. Adjust the proofer to the best state, and make basic corrections through the program that comes with the proofer to make it reach a more ideal color gamut range. Then print the IT8 color mark, and generate the profile file of the proofer as the above steps. Then configure it in the digital proofing software, but the work is not completely over yet. Because HPDesignjet4000 is four-color printing, its color gamut is smaller than the color range of the printing press. Therefore, in actual production, further debugging should be done according to the actual effect. Most midtones are no problem, mainly because there are certain color differences in some saturated tones. For example, the header of each newspaper office is generally M100% and Y100%. It is difficult to accurately restore the printed sample, so these saturated colors need to be adjusted manually. In addition, the production of ICCProfile files should be updated regularly. For newspaper printers, although they are not as accurate as commercial printing, they must be produced every six months to a year.
This is a good machine for rewind many small paper rolls coming from Paper Rope Machine (the samll roll on the rope making machine is about 1200 meters) into one bigger paper roll with 3500 to 5000 meters longer. In this way, the big paper roll is convenient to be put on Paper Handle Machine to make handles. Bigger and longer paper roll means continuous and non-stop production and high efficiency and raise the quality and reduce the defectives. It is a very good supporting machine for paper handle making machine.
Paper Rope Rewinding Machine, Paper Rope Rewinder, Rewinding Maching, Rewinder, Paper Rope, Paper Cord DongGuan FeiYang Packaging Machinery Equipment Co., Ltd , https://www.feiyang-machinery.com
