Digital printing equipment is generally divided into color digital printing machines and black-and-white digital printing machines; according to the type of paper, it can be divided into single page paper and continuous paper digital printing machines, but regardless of the classification, each category has a different brand Digital presses with different speeds and different functions. In terms of the daily use of paper for digital presses, any digital printing device will have a set of paper-use notices that meet its own structure, performance, and operation. If it is necessary to accurately measure every machine and every kind of paper, then How many versions of paper should be used for a number of digital presses. Therefore, the paper lists only some of the common paper use precautions, will be divided into the following five aspects to elaborate. First, the use of plain paper Before using digital printing equipment, you should first familiarize yourself with the paper's user manual and understand its requirements for paper, ie what standards are included in the applicable paper, and what are the compliance parameters for each standard. Normally, the standard paper needs to meet the paper type, weight, loading material and slurry standards. This requires a comprehensive inspection of the paper. (1) Paper type. Through the hardness, resistance, the characteristics of the two sides of the difference, moisture content, ash content (except pulp and other ingredients), packaging and storage conditions, post-print bending, fixing (the ability to permanently absorb ink), 9 cases of paper feeding Indicators to check if the paper type meets the specified requirements of the digital press. (2) Paper ration. There is usually a quantitative range of paper available for the printer in the manual. Using lighter (or thinner) paper may cause tearing, broken feed holes, or incorrect loading. The use of heavier (or thicker) paper may cause misfeeds (misfeeds) or blemishes, detachment from the feeder, etc., because of the excessive hardness of the paper. To avoid these problems, make sure to use paper that meets the quantitative regulations. (3) Paper fillers and pastes. If the filler ratio is too high and the pulp composition is too low, the hardness of the paper is not appropriate even if the basis weight of the paper meets the specifications. This can also cause the printer to jam, incorrectly fold or wrinkle. Therefore, paper that meets the scope of application of the digital printer should be used strictly in accordance with the paper manual of the digital printer. Second, the use of recycled paper If you want to use recycled paper, be sure to check the print quality and folding function in advance. These inspections are done for each box of recycled paper. After checking the above items, contact the paper manufacturer and ask if its recycled paper maintains consistent paper properties. When using recycled paper, note the following points. (1) Since the recycled paper is susceptible to moisture, store it in a moisture-proof film. (2) Recycled paper will produce a large amount of paper dust. These paper dusts will adhere to the rollers, sensors, paper feed channels, and drum devices, which will cause various problems. Therefore, always clean the paper dust. (3) Because recycled paper is susceptible to moisture and bending, and the hardness is low, paper feed errors often occur in recycled paper. (4) Overly curved recycled paper may cause feed or stacking errors. (5) Low mechanical strength recycled paper may cause damage to the paper feed port, incorrect folding or wrinkling. (6) Non-smooth recycled paper will reduce print quality. (7) If there are different types of recycled paper in a pile of paper, the print quality may be different. Third, the use of special paper Paper mills will continue to develop and sell various new types of special paper. In order to use these special papers, the product must be tested in advance. The following are some common special paper usage precautions. (1) Label paper The label paper must be stored in an environment with a temperature of 15°C to 32°C and a humidity of 40% to 70%, and must be used within one year of production. After leaving the factory, the label paper must be protected from moisture by using moisture-proof film or similar packaging as soon as possible. The print quality may be reduced in the tangent section. Therefore, you must avoid printing on the tangent part. For the sake of printing accuracy, a 2mm border should be left. If the label or back sheet has a different quality or thickness, fuser heating may cause the paper to curl. In order to avoid such situations, the label and the back page must use electrostatic printing paper, such paper will not have obvious curl when heated. If the label stack is too high, the bottom sheet of adhesive may be squeezed out due to the weight of the stack. Therefore, consult the paper manufacturer for the maximum stack height. (2) Perforated paper Perforated bumps or burrs can negatively affect print quality. Therefore, be sure to use only paper that has no bulges and burrs. Avoid printing near apertures when designing print formats. For the sake of print accuracy, each hole should leave a margin of about 3.5mm. (3) sealing envelope paper Uneven adhesives can cause misfeeds or negatively affect print quality. Therefore, you should avoid using print media that have such problems. Printing of important data should not be close to the adhesive, leaving a border of at least 3.5mm. If too many sealed envelopes are stacked together, the stacking pressure may cause the media to stick together. Therefore, consult the manufacturer for the maximum stackable height. Some sealed envelopes have a shorter storage time than ordinary media. This also requires consultation with the manufacturer for shelf life and storage conditions. (4) Postscript type media (postcard type) Both sides (may be one side) of the post-script paper media (postcard type) are coated with adhesive. Since the preprinting environment for such media (eg ink type, number of colors) is very strict, consult the paper manufacturer before purchasing. Each side of the print media is coated with a pressure sensitive adhesive. Therefore, when the adhesive surface is coated, the adhesive failure may be caused due to insufficient adhesive strength. To prevent this type of problem, you should avoid designing pages to print at the symmetrical position of the folded pages. (5) color paper Colored paper has a smoother surface than normal paper because colorants and fixing agents (resins) penetrate into the paper fibers. Therefore, the toner is less likely to penetrate the paper fibers, and the fixing strength of the toner is lower. When the adsorption force between the fixing agent and the toner is low, the toner fixing strength is particularly low. If you must use colored paper, check the printing conditions carefully and preprint them. (6) Embossed paper Embossed paper with company logos and other marks is called embossed paper. Inconsistent or uneven thickness of each part of the paper may cause paper jams or negatively affect the print quality. Carefully check the print conditions beforehand and print them in advance. (7) coated paper Papers coated with titanium oxide, kaolin, clay, or calcium carbonate are used as art paper, coated paper, light coated paper, or full coated paper. In general, coated paper has low toner fixing strength and low print quality. When you want to print a coated paper, consult the paper manufacturer in advance to confirm the print conditions and pre-print. (8) Carbonless paper Carbonless paper consists of three parts that can sense pressure. On contact printers, carbonless copy paper can achieve simultaneous printing. Pressure-sensitive media can transfer print content to the second and third parts. When using a non-contact printer, all three parts need to be printed separately and then bound together. Carbonless paper is thin in every part, and it is prone to paper feeding or stacking mistakes, or pressure-sensitive media that melts the paper due to temperature factors. Therefore, spare parts replacement and maintenance conditions must be evaluated before printing a large amount of carbonless copy paper. Fourth, avoid the use of paper Inapplicability of paper consists of a number of factors that will reduce print quality or cause some unusual paper feed errors. It is best not to use the following types of paper: (1) Incorrectly folded paper; (2) Torn paper or paper with irregular holes; (3) Paper with missing corners; (4) Curved, wrinkled, undulating or sunken paper; (5) Tilted paper; (6) Paper with small shreds and external objects (such as wax, metal sheet, glue, resin, etc.); (7) Special paper with glue or tape. Fifth, the storage of paper In addition to the use of paper type, paper quantification, etc., and the digital printing machine performance, the daily paper storage box can not be ignored, if not properly stored, it will cause paper deformation, and will directly affect the effect of printed products, or cause printing failures . First, paper cannot be placed directly on the floor. Placed directly on the floor can cause the paper to become damp. Place the tray horizontally on a flat shelf, a flat shelf, or a tow table. To prevent paper from being deformed, do not stack too much paper on each other. Stacking height should not exceed 1 meter. To prevent the paper from drying or getting wet, it is best to place the paper in a sealed box at 10°C to 30°C and maintain a relative humidity of 40% to 50% (maximum drying temperature of 29°C). When opening the box to find that the paper does not have waterproof storage conditions, place the paper tray in a suitable environment with waterproof measures. The recommended environment is a temperature of 15°C to 25°C and a relative humidity of 30% to 70%. Even in a dry, damp-proof environment, paper cannot be stored for too long (more than 6 months). Once the paper tray is opened, the paper must be wrapped with a waterproof film to prevent it from becoming too dry or damp. Paper should not undergo sudden temperature changes to prevent it from becoming too dry or damp. It is best to ship to the place of use beforehand, buffer it for some time and turn it back on. These are some of the basic daily printing experience of digital printing presses, and we hope to help digital printing practitioners.