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SWIFT Understanding Digital Printing Techniques Combination of Offset and Digital Printing packaging boxes wholesale

by:SWIFT     2019-09-23
With the maturity of digital printing technology and the continuous reduction of its cost, printing manufacturers have begun to combine traditional offset printing with new digital printing technologies. Their goal is to provide a unique value-added service and turn it into profit. Newspapers, labels, plastic cards, retail flyers, mailings, human resources manuals, etc. These applications will benefit from the combination of color offset and monochrome digital printing technologies. However, the combination of new and old technologies faces many technical challenges. In the process of combining offset printing and digital printing, the printing manufacturer needs to take full account of the substrate, ink and environment. Because certain conditions may be ideal for one printing mode, it may not be appropriate for another printing mode. Only by effectively controlling the variables in printing can these two technologies complement each other. Based on the above reasons, this article focuses on several key factors that determine the success of the “fusion” of offset printing and digital printing. 1. Ink Ink is an important factor that affects the combination of offset printing and digital printing. Its performance will directly affect the quality of printed products. Ink is the cheapest but most important of many factors in print production. Many offset printing inks are not suitable for digital presses because offset printing inks often contain large amounts of waxes and resins to improve the rubfastness of the prints. If a sheet of paper that has just been printed with an offset press is immediately sent to the digital printer, the proof will withstand a high temperature of 111°C (at this temperature, the toner in the digital printer will melt and adhere to the surface of the printing material). The wax and resin in traditional offset printing inks soften, resulting in prints with ghosting, smearing on the back, yellowing of the colors, blurring of the image, and the like. Metal inks and fluorescent inks also have the same problem in the digital printing process. The peeled ink sticks to the printing cylinder. The solution to this problem is to use a 'laser-compatible' ink that is resistant to high temperatures. To determine the laser's suitability for lasers, GATF Labs offers a test method that simulates the pressure and temperature of a digital press. The ink and paper were placed on a plywood and placed under a pressure of 25 lbs. and operated at a high temperature of 111°C for 30 minutes. If the proofs were stuck, the ink was not laser-compatible. 2. Drying and Curing Laser-adaptive inks contain little or only a small amount of waxes, resins, etc., and therefore have lower friction resistance. Therefore, special treatments such as glazing of the printed sheets are required to fix the ink and toner. To avoid the softening of the offset ink, the printing manufacturer needs to repeat the experiment to determine the correct formula. With laser-adaptive ink printing, printed sheets require a relatively long drying and curing time, and printed sheets normally printed on an offset printing press can be printed on a digital press after going through 24 to 72 hours. In the offset printing process, attention should also be paid to minimizing the amount of dusting, as digital presses are sensitive to this. 3. Paper From the requirements of paper moisture, offset and digital printing are almost the opposite. Digital printing is particularly sensitive to excessive moisture. Drying and curing are the key to the quality of printed sheets. Experts recommend the minimum ink density and the maximum amount of fountain solution in the offset printing process, which will effectively prevent the paper from curling and wrinkling during digital printing. The user should select the type and amount of paper based on the characteristics of the digital press. Digital printing machine paper generally has the following characteristics: low water content, smooth surface and alkaline. Should avoid the use of those rough surface of the paper, such as uneven or rough texture of the substrate, etc., because the toner is difficult to adhere to the substrate surface. Digital Market, a printer specializing in personalized mail and advertising mail, uses 85% of its jobs for 'pre-printed' substrates, that is, first printing off some graphics with offset printing, and then printing on digital printing machines. Change information. Executive Vice President Joel Hoefle explained: “Our goal is to try to make those black, content-changing fonts look like they were printed on offset machines.” The company uses DocuTech 6135, 6180, DocuColor, and HP Indigo from Fuji Xerox. Press1000 digital press. In order to achieve the desired results, they rigorously selected and tested new substrates and insisted on the use of paper recommended by digital press manufacturers. Hoefle added: “We are also very aware of what kind of substrates other digital printers have purchased from paper manufacturers and what are the most popular papers on the market to help us make the right decisions.” Related tags: Customized food packaging solutions bags, aluminum film bags manufacturers,
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