Digital Printing Paper Digital printing can use a variety of paper, even labels, plastic film and other materials. But different printers have different requirements for paper size, coating and materials. Some digital presses require that the paper be specially treated to ensure adhesion to toner or ink. You must always contact your local printing house to request a sample for use. In summary, you can find different weights of paper for text, books (coated or uncoated) covers and securities. With the increasing use of digital printing, the range of available paper materials will continue to expand.
Roll feed and single feed The choice of paper and other materials is also limited by how the printing system feeds paper. Web printing presses, such as Agfa's Chromapress, can continuously print on both sides simultaneously, and then cut a single page or fold at the time of paper discharge. Sheet-fed printing presses, such as Indigo's E-print 1000, print on one side of a sheet at a time.
Web printing is usually faster and more flexible in terms of print length and format. On continuous tapes, it is suitable for printing large posters such as posters or posters, stencils, etc. from 6 to 8 pages. But the paper must be made into a suitable roll size for the press.
Sheetfed printers provide more paper types, but the imposition and image size are limited. In addition, paper jams often occur on sheets.
Web printing machine
Sheet-fed printing machine
The paper is fed from the paper roll into the web press. The continuous paper web passes through the printing unit once for quick and uninterrupted printing. Some web printing machines, such as Agfa's Chromapress, can print on both sides at the same time. It can both increase the speed and at the same time ensure accurate color registration. Although there are limitations in the choice of paper type or other materials, webs can provide greater flexibility in hand or image design. With different page sizes, there will be different size differences after cropping. On a single-feed printer, paper is stacked in the paper feeder. Each sheet of paper is fed into the printer by a pick-up device. When the two-sided printing is performed, the paper needs to be automatically or manually turned over and sent again for printing. Indigo's E-print 1000 holds a single sheet of paper against a single roller, thus avoiding noticeable misregistration. In addition, it can automatically print on both sides. The Heidelberg QuickMaster DI is more like a traditional offset press. The sheet passes through four rollers. To print on both sides, the paper must be reloaded.Sheet-fed digital printers usually provide more paper types and weights, but the size is limited, and there is a shift between sheets, which can limit the amount of bleeding and the cutting area. Approximate Print Area Paper Weight Range Print Area Paper Weight Range Agfa Chromapress 12 x 72" 60-250 g Scitex Spontane 11 x 17" 60-216 g Xeikon DCP series 12 x 72" 60-250 g Indigo E-Print 12 x 18 90-200 g Heidelberg DI 46-4 13×18 inch 60-360 g
Inks and toners Many digital printers, such as Agfa's Chromapress, whose high-speed printing technology is based on the principle of electronic imaging, transfer images to paper via dry toner. Toner is a colored powder, due to many tiny The composition of the particles. The metal photoreceptor drum is charged by a laser or light emitting diode to form an image domain, which is then transferred to paper and finally high-temperature-fixed.
Unlike conventional inks, the toner is not absorbed by the paper, but is attached to the surface of the paper, which eliminates the dot overflow caused by the ink penetrating into the paper fibers. Because the toner particles are very small, when it is adsorbed by the computer After a very small electronic network, it will produce a more accurate color and halftone network.
Similarly, Indigo's E-Print 1000 uses an electronic ink consisting of many fine particles suspended in oil, also known as a liquid toner. Although it is a liquid, it can dry immediately, with almost no dot gain. .HQDI (Heidelberg Quickmaster DI) uses standard dry offset printing inks. The image is not transferred electronically to the printing plate, but is contained in the recessed area of ​​the plate etched by the laser.
Similar to other materials, other materials used in digital printing also need to be specially treated to ensure adhesion to ink or toner. Some materials can only be printed on one side. Please contact your local digital printing plant or supplier to make it clearly usable. Materials, some commonly used materials are listed below:
Stickers: single-sided stickers, also known as sticky notes, for the production of labels or stickers and other icons.
Polyester material: Roll-shaped white polyester material, often used for printing floor plans, ID cards, computer mouse backplanes, marine charts and data for dirty or underwater environments.
Transparent film: Standard transparent film for projectors, may need to adjust the amount of ink to increase transparency.
Polypropylene, acetate and polyvinyl chloride materials: used for making shopping bags, compression packaging, protective covers, food and pharmaceutical packaging, etc.
The cost of consumables Since manufacturers often produce specialized inks, toners, and developers, the cost of these consumables often means that digital printing leaflets cost more than traditional printing, but for four-color short-run printing, the total cost is usually Lower than the traditional printing and the speed has improved significantly.
Paper weight conversion table
Securities paper(Tissue paper has many colors and textures and is not suitable for double-sided printing, because the paper is often only one-sided printing ink or toner.) 13 pounds 49 grams 16 pounds 60 grams 20 pounds 75 grams 24 pounds 90 grams of book paper
(Comparatively thin for a variety of publications, such as books, magazines, product catalogs, promotional items.) 20 pounds 30 grams 30 pounds 44 grams 40 pounds 59 grams 50 pounds 74 grams 60 pounds 89 grams 70 pounds
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