Hybrid technology of the hottest offset printing m

2022-08-11
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Hybrid technology of offset printing machine and digital printing machine

with the increasing maturity of digital printing technology and the continuous decline of cost, many printers have begun to try to combine traditional offset printing machine with digital printing machine to complete production. The purpose is to provide profitable and unique value-added services. Combining static color offset printing with dynamic monochrome digital printing can benefit many applications, such as daily transactional printing, newsletters, labels, plastic plates, retail flyers, direct mail letters, human resources pamphlets, etc

however, there are great technical challenges in combining an old technology with a new technology. In the process of combining offset printing with digital printing, printers have to consider: which is the most ideal substrate material, ink and operating environment for a technology. These two processes can be compatible with each other only when the printing parameters are strictly controlled. The following are the determinants of how to successfully "mix" the two technologies:

the importance of ink

in the process of combining offset printing with digital printing, the ink is the most worthy of serious consideration. Although compared with paper, the value of ink itself and its impact on the profitability of a printing job are relatively weak, which may become a neglected factor, in the process of the integration of the two technologies, the characteristics of ink will directly affect the product quality

ink is the cheapest material in the printing process, but it is very important. However, the ink used in offset printing cannot bear the heat in digital printing, mainly because the ink in offset printing usually contains a lot of wax and resin to improve the anti friction ability. As the result of the desire of engineers of polar racing to explore "how to use the technology behind the success of the car to improve the performance of Volvo cars driving on the road (i.e. all road conditions in ordinary life)", once the print is entered into the digital printer using electrostatic copying technology, it must withstand the test of up to 400 degrees Fahrenheit, Such a high temperature can melt the toner on the substrate, but at the same time, it also softens the wax and resin in the ordinary offset printing ink, resulting in ghosting and back rubbing, reducing the transparency of yellow. Metal and fluorescent inks also often cause problems in digital printing, mainly because the sheet of metal ink is easy to deposit on the hot-melt roller of the printer

in order to perfectly combine offset printing and digital printing, it is recommended to use an ink compatible with laser technology to withstand excessive temperature. In order to judge the ability of ink to be compatible with laser, the service center of GATF research laboratory has developed a "blockage" experiment that simulates the internal pressure and heat of digital printers. The experimental process is as follows: clamp two samples with a clamp, and apply a high temperature of 400 degrees Fahrenheit and a pressure of 25lbs for 30 minutes. If the sample is sticky, this kind of ink cannot be used in laser imaging printers. The only difference between the two printing machines is the type of ink required: Di printing machines require anhydrous ink, while offset printing machines require ink compatible with laser technology

drying and curing

laser compatible inks generally contain little or no wax or resin, so the anti friction ability of this kind of ink is low. It can be treated to better carry out post press processing, such as polishing on the print or water-based coating to seal the ink and toner. Experiments can be carried out to find the most suitable method and formula

after offset printing with ink compatible with laser technology, sufficient drying and curing time is required before the printing sheet enters the digital printer, generally 6 It takes 24 ~ 72 hours to be equipped with ammeter, voltmeter or power meter. Printers must reduce the amount of dusting as much as possible, because digital printers are extremely sensitive to this "pollutant"

the above paragraph about the implementation of Timken clearly illustrates several things: 1 Experimental method: friction between rotating parts and fixed parts most equipment manufacturers hope users to use digital printers first in the production process, and then complete color printing on the traditional offset press, so as to keep the drum clean. However, some prints need to overprint black fonts in the color area, so the offset ink must be completely dry before the print sheet enters the digital printer, otherwise the back will rub dirty

in order to save production time, printers can use offset printing to print a large number of book covers, which can be preserved after coating and lamination, and further processing can be completed by digital printers when necessary. But this method is only suitable for those printing activities that do not need to change the cover design. Otherwise, it will lead to waste of time, ink and paper

speed requirements

if you already have a stable offset press, but want to provide customers with variable data printing services, what kind of digital printer should be selected to match the existing equipment? The answer is: digital printing machines that can keep up with the speed of offset printing machines, at least not much lower than the speed of offset printing, otherwise it will lead to a decline in profits. This criterion is more practical especially when the digital printing press is connected with the offset press

if only processing monochrome variable, its speed control is actually inaccurate data information, and there is an offset press. If there is another digital press with high speed, it is very ideal to combine digital printing with offset printing. Xeikon's varypress printing machine is often online with offset printing machines, with a speed of 300 ~ 400fpm. It is generally used for the production of commercial forms and transportation labels. If we have to reduce the speed of the offset press by 2/3 in order to adapt to the speed of the digital press, it will be at the cost of losing production efficiency

source: printed in China

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