Knowledge

Flexography

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a clean wipe of the anilox roll. The doctor blade system can either be an open single blade system or an enclosed dual blade system. The single blade system uses an open ink pan with a roller that is then sheared with one doctor blade to create a uniform layer of ink to be distributed. The remaining ink sheared from the anilox roll will collect in the ink pan to then be pumped back into the system. The cylinder plate, anilox, and doctor blade are independently controlled by hydraulic, pressure and/or pneumatic systems. This system is best used for low to mid quality print work - usually found in corrugated box printing. The dual blade system is an enclosed system that has one doctor blade for doctoring the ink and one containment blade that contains the ink in the chamber and allows ink from the anilox roll back in. Dual blade systems require 2 end seals and adequate chamber pressure in order to maintain the tight seal between the ink chamber and the anilox roll. This system is best used for high quality, intricate print designs, like those found in the label industry.
866:. A film negative is placed over the plate, which is exposed to ultra-violet light. The polymer hardens where light passes through the film. The remaining polymer has the consistency of chewed gum. It is washed away in a tank of either water or solvent. Brushes scrub the plate to facilitate the "washout" process. The process can differ depending on whether solid sheets of photopolymer or liquid photopolymer are used, but the principle is still the same. The plate to be washed out is fixed in the orbital washout unit on a sticky base plate. The plate is washed out in a mixture of water and 1% dishwasher soap, at a temperature of approximately 40 °C. The unit is equipped with a dual membrane filter. With this the environmental burdening is kept to an absolute minimum. The membrane unit separates photopolymer from the washout water. After addition of absorb gelatine for example, the photopolymer residue can be disposed of as standard solid waste together with household refuse. The recycled water is re-used without adding any detergent. 1193:. Measuring the physical properties of inks and understanding how these are affected by the choice of ingredients is a large part of ink technology. Formulation of inks requires a detailed knowledge of the physical and chemical properties of the raw materials composing the inks, and how these ingredients affect or react with each other as well as with the environment. Flexographic printing inks are primarily formulated to remain compatible with the wide variety of substrates used in the process. Each formulation component individually fulfills a special function and the proportion and composition will vary according to the substrate. 870: 919: 62: 1133: 1018: 38: 494: 596: 453: 658: 440: 1084:. The doctor blade removes excess ink from the anilox roller before inking the printing plate. The substrate is finally sandwiched between the plate and the impression cylinder to transfer the image. The sheet is then fed through a dryer, which allows the inks to dry before the surface is touched again. If a 776:
classified aniline dyes as unsuitable for food packaging and as a result, printing sales plummeted. Individual firms tried using new names for the process, such as "Lustro Printing" and "Transglo Printing", but met with limited success. Even after the Food and Drug Administration approved the aniline
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system. The fountain roll or two-roll system has one roll spinning in an ink pan pressed against the anilox roll to transfer a layer of ink to then be applied to the printing plate. This system is best used for low quality print such as flood coats and block lettering due to its inability to produce
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The anilox roll is a unique characteristic of flexography. The anilox roller transfers a uniform thickness of ink to a flexible printing plate. The anilox roll has finely engraved cells with a particular ink capacity, viewable with a microscope. These rollers are responsible for transferring inks to
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roll (or meter roll) whose texture holds a specific amount of ink since it is covered with thousands of small wells or cups that enable it to meter ink to the printing plate in a uniform thickness evenly and quickly (the number of cells per linear inch can vary according to the type of print job and
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The same principle is applied for multiple plates across the sleeve and so either two cameras per plate are used or two cameras are used which move into the correct position driven by servo motors and camera setting software. To step plates around the sleeve to minimise risk of bounce is done either
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and containers, envelopes and wallpaper. In recent years there has also been a move towards laminates, where two or more materials are bonded together to produce new material with different properties than either of the originals. A number of newspapers now eschew the more common offset lithography
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Flexo has an advantage over lithography in that it can use a wider range of inks, water based rather than oil based inks, and is good at printing on a variety of different materials like plastic, foil, acetate film, brown paper, and other materials used in packaging. Typical products printed using
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The high magnification video cameras (positioned on a precision machined camera beam) are moved into the required position for the plate to be mounted, accurate measurement of this setting is critical. The plate is then adhered to the sleeve using a mounting tape (see item 5) and the complete unit
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The third method is to go through a molding process. The first step is to create a metal plate out of the negative of our initial image through an exposition process (followed by an acid bath). In the early days the metal used was zinc, leading to the name 'zincos'. Later, magnesium was used. This
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An optional doctor blade scrapes the anilox roll to ensure that the ink to be delivered to the flexible printing plate is only what is contained within the engraved cells. Doctor blades had predominantly been made of steel, but advanced doctor blades are now made of polymer materials with several
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Positioning is achieved by correctly lining up register marks that are common to each plate in the set. The skill is to plan carefully exactly where these marks should be. A variety of marks can be used, register crosses and micro dots. A good bond is achieved by means of special mounting tape.
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Generally plates are mounted directly onto the print sleeve but for corrugated operations, plates are mounted onto a carrier sheet that is fixed to the print sleeve in the press when required, it is removed and kept in storage between print runs. You'll find out about carriers in the corrugated
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Precision mounting is critical for producing good quality print which is in the register and has a direct impact on minimizing waste. The mounting process needs to deliver the same accurate result each time a job is mounted, consistent accuracy is the target. For simplicity we'll refer to print
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exactly with the images transferred from the other colors. To ensure an accurate picture is made, mounting marks are made on the flexographic plates. These mounting marks can be microdots (down to 0.3 mm) and/or crosses. Special machinery is made for mounting these plates on the printing
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Once the plate is accurately aligned, it's pressed onto the strip of exposed mounting tape. The rest of the tape liner is then removed or a plate support table is moved so that the remainder of the plate can be laid onto the sleeve. This is done with each sleeve in turn so that all the plates
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material. Flexographic plates can be created with analog and digital platemaking processes. The image areas are raised above the non image areas on the rubber or polymer plate. The ink is transferred from the ink roll which is partially immersed in the ink tank. Then it transfers to the
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The most common form of mounting is register mark - also known as video mounting. When the print is run the register marks should print on top of each other indicating that the plates are correctly aligned. The register marks on the plate are lined up using magnifying cameras.
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The location of registration marks, whether crosses or microdots, is essential to the success of plate mounting. If they are incorrect, mounting can be difficult, time-consuming and inaccurate, so they need to be planned carefully. The marks should be positioned symmetrically
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Register crosses are more common in label and corrugated printing where waste and hidden folds are normal, the microdot is common in flexible packaging where waste is kept to a minimum and no un-required marks are to be seen on the packaging (example meat, dairy and hygiene).
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oil-based ink were developed. This led to the process being called "aniline printing". By the 1920s, most presses were made in Germany, where the process was called "gummidruck", or rubber printing. In modern-day Germany, the process continues to be called "gummidruck".
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Always have a pair positioned in the middle of the plate in line with the sleeve axis. It is also recommended to have two more pairs, one at either end so a simple rotation and check under the cameras confirms the plate has not twisted when it was laid/stuck down.
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rolls along with chambered ink systems, have also played a part in the improvement of print quality. Full-color picture printing is now possible, and some of the finer presses available today, in combination with a skilled operator, allow quality that rivals the
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Micro dots as the name suggests are tiny dots on the plate, usually about a quarter of a millimeter across in labels and flexible packaging but 1mm diameter in corrugated. Since they are so small they don't have to be in waste areas as they are not easily seen.
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board or even glass or plastic, through a first molding process. Once cooled, this master mold will press the rubber or plastic compound (under both controlled temperature and pressure) through a second molding process to create the printing plate or cliche.
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For every colour to be printed, a plate is made and eventually put on a cylinder which is placed in the printing press. To make a complete picture, regardless of printing on flexible film or corrugated paper, the image transferred from each plate has to
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The next sleeve is loaded and the plate mounted in position by positioning the register marks on the plate based on the previously fixed camera positions. This ensures that every plate is mounted in the same position and thus the print is in register.
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process in 1949 using new, safe inks, sales continued to decline as some food manufacturers still refused to consider aniline printing. Worried about the image of the industry, packaging representatives decided the process needed to be renamed.
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Each plate is mounted on a double sided adhesive tape - there are many types of mounting tape and it is important to use the correct thickness and hardness. Adhesive type also needs to be correct for your mounting process (see Tape Features)
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To counter this, automatic mounting provides up to 10x faster plate mounting than traditional plate mounting, no operator dependency and the highest possible accuracy and consistency down to 5 micron (0.0002 inch) per plate.
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The impression cylinder applies pressure to the plate cylinder where the image is transferred to the image-receiving substrate. This impression cylinder or "print anvil" is required to apply pressure to the plate cylinder.
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Registration crosses are commonly used but need to be positioned in waste areas as they are easily seen on the print, they can also be used as a guide for aligning the print to a bag or box structure if this is required.
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the quality required). To avoid getting a final product with a smudgy or lumpy look, it must be ensured that the amount of ink on the printing plate is not excessive. This is achieved by using a scraper, called a
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The tape is applied to the sleeve being careful to lay it on without trapping air underneath it (must be flat to sleeve). A small strip of the tape liner is removed to leave the adhesive exposed initially.
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flexography include brown corrugated boxes, flexible packaging including retail and shopping bags, food and hygiene bags and sacks, milk and beverage cartons, flexible plastics, self-adhesive labels,
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The plate cylinder holds the printing plate, which is made from a soft flexible rubber-like material. Tape, magnets, tension straps and/or ratchets hold the printing plate against the plate cylinder.
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industry for printing plastic materials for packaging and other end uses. For maximum efficiency, the flexo presses produce large rolls of material that are then slit down to their finished size on
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The fountain roller transfers ink located in an ink pan to a second roller, an anilox roller. In modern flexographic printing, the anilox roll is referred to as a type of meter or metering roller.
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The cameras provide an enlarged visual display indicating whether or not the register marks are correctly positioned in line with crosshair targets. If necessary the plate position is adjusted.
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cylinders to maintain registration. Earle L. Harley invented and patent the Opti-Chek Mounting and Proofing machine enabling the operator to check the registration before going to the press.
1341:"Printing Process Descriptions: Environment and Printing: The Printers' National Environmental Assistance Center: PNEAC: The Environmental Information Website for the Printing Industry" 788:'s Printed Packaging Committee narrowed the selection to three possibilities: "permatone process", "rotopake process", and "flexographic process". Postal ballots from readers of 1273:
Printing press speeds of up to 750 meters per minute (2000 feet per minute) are achievable now with modern technology high-end printers. Flexo printing is widely used in the
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process until recently. Since 1990, great advances have been made to the quality of flexographic printing presses, printing plates, ink systems and printing inks.
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to eliminate air bubble inclusions, tape application options, plate and tape cutting options and moving cameras, replacing multiple camera mounting systems.
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In recent years higher quality demands from customers, shorter and more frequent job runs result in an increasing relative cost of the prepress department.
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On most mounting machines the dots or crosses on the plates are lined up using magnifying cameras, the higher the magnification the greater the accuracy.
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process. One ongoing improvement has been the increasing ability to reproduce highlight tonal values, thereby providing a workaround for the very high
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To align the plates accurately a mounting system using video cameras is required. Each print sleeve is transferred to the mounting system in turn.
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During the early part of the 20th century, the technique was used extensively in food packaging in the United States. However, in the 1940s, the
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The ink is controlled in the flexographic printing process by the ink system. The ink system contains an ink pump, anilox roll and either a
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The nature and demands of the printing process and the application of the printed product determine the fundamental properties required of
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Originally, flexographic printing was rudimentary in quality. Labels requiring high quality have generally been printed using the
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Accurate positioning is essential or the images of each colour will not be superimposed correctly, they will be out of register.
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Johansson, Lundberg & Ryberg (2003) "A guide to graphic print production", John Wiley & Sons Inc., Hoboken, New Jersey.
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The plate is carefully positioned over tape, usually by hand so that the register marks are seen directly below the cameras.
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In 1951 Franklin Moss, then the president of the Mosstype Corporation, conducted a poll among the readers of his journal
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https://web.archive.org/web/20100816235813/http://glossary.ippaper.com/default.asp?req=knowledge%2Farticle%2F151
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have pioneered the latest technologies, with advances in fast washout and the latest screening technology.
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Each sleeve is fixed in the mounter by a clamping system and mounting tape is then applied to the sleeve.
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Precision mounting of flexo plates on tape with the aid of laser pointers on automatic mounting machine
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The second method uses a computer-guided laser to etch the image onto the printing plate. Such a direct
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to submit new names for the printing process. Over 200 names were submitted, and a subcommittee of the
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sleeves throughout this module but you can substitute cylinders if these are used in your operation.
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Diagram of a typical flexographic printing apparatus, illustrating the general operating principle.
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printing plates, including improvements to the plate material and the method of plate creation.
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may contain an excessive amount of intricate detail that may interest only a particular audience
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A flexographic print is made by creating a positive mirrored master of the required image as a
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mechanically using an index disc or by use of stepper motors to drive and lock it in position.
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Automatic Flexo Plate Mounter used for accuracy down to 5 microns without operator dependency
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ink is used, the sheet does not have to be dried, but the ink is cured by UV rays instead.
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metal plate in relief is then used in the second step to create the mold that could be in
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overwhelmingly chose the last of these, and "flexographic process" was chosen.
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systems have seen a good improvement in the industry recently. Companies like
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any relevant information, and removing excessive detail that may be against
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to lay the plate on to make maneuvering the plate into position simpler,
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These are various types of mark used for aligning the plates correctly:
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The greatest advances in flexographic printing have been in the area of
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process in favour of flexo. Flexographic inks, like those used in
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There are five types of inks that can be used in flexography:
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the flexible printing plates mounted on the plate cylinders.
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Handbook of print media: technologies and production methods
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and unlike those used in lithography, generally have a low
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The first method of plate development uses light-sensitive
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International Paper - Knowledge center - Flexography:
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reactions) - although these are uncommon at the moment
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Flexopedia - Flexo Encyclopaedia Especially for Thee
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Printers' National Environmental Assistance Center:
1318:(Illustrated ed.). Springer. pp. 976–979. 1397:"Automatic Flexo Plate Mounting Machine | SAMM 2.0" 760:In 1890 the first such patented press was built in 518:. Unsourced material may be challenged and removed. 392: 382: 372: 362: 347: 337: 327: 317: 307: 297: 287: 277: 267: 257: 247: 237: 227: 217: 207: 197: 187: 177: 167: 157: 147: 137: 122: 107: 97: 87: 77: 1212:two-part chemically-curing inks (usually based on 1029:Flexo plate mounting equipment includes many 744:plate. It is essentially a modern version of 420: 8: 481:Learn how and when to remove these messages 443:PCMC's Fusion C Flexographic Printing Press 1460:European Flexographic Industry Association 427: 413: 60: 44: 717:Learn how and when to remove this message 699:Learn how and when to remove this message 640:Learn how and when to remove this message 578:Learn how and when to remove this message 1227:below 5 μm may cause problems when 36: 1290: 850:associated with flexographic printing. 52: 74: 7: 1391: 1389: 1387: 516:adding citations to reliable sources 992:removed from the mounting machine. 934:There are two key areas to achieve 1160:different types of beveled edges. 740:process which utilizes a flexible 25: 462:This article has multiple issues. 656: 594: 492: 451: 1373:from the original on 2013-09-08 1347:from the original on 2016-03-04 1031:options to increase efficiency. 503:needs additional citations for 470:or discuss these issues on the 1206:electron beam (EB) curing inks 41:A flexographic printing plate. 1: 353: 128: 113: 1223:Water based flexo inks with 1209:ultraviolet (UV) curing inks 774:Food and Drug Administration 681:Knowledge's inclusion policy 1039:lay down (pressure) rollers 946:Types of registration marks 873:Flexographic printing press 620:the claims made and adding 1501: 1367:"AV Flexologic: Cosmoline" 1182: 1179:Flexographic printing inks 1156:3. Doctor blade (optional) 1116:Outfeed and rewind section 29: 1098:Unwind and infeed section 374:Thermal-transfer printing 1312:Kipphan, Helmut (2001). 1092:Basic parts of the press 936:effective plate mounting 931:section of this module. 249:Photostat and rectigraph 27:Form of printing process 1171:5. Impression cylinder 48:Part of a series on the 1299:"Rubber Stamps Online" 1137: 1022: 977:Register Mark Mounting 923: 874: 732:(often abbreviated to 444: 99:Intaglio (printmaking) 42: 1135: 1020: 921: 872: 837:Laser-etched ceramic 442: 219:Hot metal typesetting 40: 1455:what is Flexographic 1364:AV Flexologic B.V.: 1128:Operational overview 1026:register correctly. 512:improve this article 239:Daisy wheel printing 786:Packaging Institute 279:Dot matrix printing 54:History of printing 1200:solvent-based inks 1141:1. Fountain roller 1138: 1023: 924: 881:process is called 875: 605:possibly contains 445: 364:Solid ink printing 79:Woodblock printing 43: 1191:flexographic inks 1164:4. Plate cylinder 883:computer to plate 727: 726: 719: 709: 708: 701: 650: 649: 642: 607:original research 588: 587: 580: 562: 485: 437: 436: 402: 401: 269:Spirit duplicator 179:Chromolithography 16:(Redirected from 1492: 1442: 1438: 1432: 1429: 1423: 1417: 1411: 1410: 1408: 1407: 1393: 1382: 1381: 1379: 1378: 1362: 1356: 1355: 1353: 1352: 1336: 1330: 1329: 1309: 1303: 1302: 1295: 1231:recycled paper. 1203:water-based inks 1185:Flexographic ink 1148:2. Anilox roller 1104:Printing section 854:Process overview 722: 715: 704: 697: 693: 690: 684: 660: 659: 652: 645: 638: 634: 631: 625: 622:inline citations 598: 597: 590: 583: 576: 572: 569: 563: 561: 520: 496: 488: 477: 455: 454: 447: 429: 422: 415: 394:Digital printing 358: 355: 349:Thermal printing 309:Phototypesetting 133: 130: 118: 115: 75: 64: 45: 32:Flexo (Futurama) 21: 1500: 1499: 1495: 1494: 1493: 1491: 1490: 1489: 1485:Relief printing 1470: 1469: 1451: 1446: 1445: 1439: 1435: 1430: 1426: 1418: 1414: 1405: 1403: 1395: 1394: 1385: 1376: 1374: 1365: 1363: 1359: 1350: 1348: 1339: 1337: 1333: 1326: 1311: 1310: 1306: 1297: 1296: 1292: 1287: 1259:disposable cups 1254: 1237: 1187: 1181: 1173: 1166: 1158: 1150: 1143: 1130: 1125: 1094: 1054: 908: 879:laser engraving 861: 856: 816:direct to plate 798: 758: 736:) is a form of 723: 712: 711: 710: 705: 694: 688: 685: 671:Please help by 670: 661: 657: 646: 635: 629: 626: 611: 599: 595: 584: 573: 567: 564: 521: 519: 509: 497: 456: 452: 433: 404: 403: 356: 329:Dye-sublimation 319:Inkjet printing 259:Screen printing 209:Offset printing 149:Relief printing 131: 116: 72: 35: 28: 23: 22: 15: 12: 11: 5: 1498: 1496: 1488: 1487: 1482: 1472: 1471: 1468: 1467: 1462: 1457: 1450: 1449:External links 1447: 1444: 1443: 1433: 1424: 1412: 1383: 1357: 1331: 1324: 1304: 1289: 1288: 1286: 1283: 1253: 1250: 1236: 1233: 1225:particle sizes 1221: 1220: 1210: 1207: 1204: 1201: 1183:Main article: 1180: 1177: 1129: 1126: 1124: 1121: 1120: 1119: 1113: 1110:Drying station 1107: 1101: 1093: 1090: 1033:These include 859:1. 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Retrieved 1400: 1375:. Retrieved 1360: 1349:. Retrieved 1334: 1314: 1307: 1293: 1272: 1255: 1252:Applications 1245:doctor blade 1238: 1235:Ink controls 1222: 1214:polyurethane 1195: 1188: 1170: 1169: 1163: 1162: 1155: 1154: 1147: 1146: 1140: 1139: 1115: 1109: 1103: 1097: 1082:doctor blade 1051: 1050: 1046: 1043: 1038: 1034: 1030: 1028: 1024: 1013: 1010: 1006: 1002: 998: 994: 990: 987: 984: 980: 976: 975: 971: 967: 963: 960: 956: 952: 949: 945: 944: 940: 935: 933: 929: 925: 905: 904: 895: 876: 858: 857: 844:lithographic 836: 813: 809:photopolymer 806: 799: 789: 781: 779: 771: 759: 733: 729: 728: 713: 695: 686: 673:spinning off 666: 636: 627: 604: 574: 565: 555: 548: 541: 534: 522: 510:Please help 505:verification 502: 478: 471: 465: 464:Please help 461: 189:Rotary press 89:Movable type 18:Flexographic 1052:3. Printing 906:2. Mounting 746:letterpress 730:Flexography 384:3D printing 357: 1972 169:Lithography 132: 1515 117: 1440 1474:Categories 1406:2019-05-07 1377:2015-08-05 1351:2009-01-29 1285:References 1281:machines. 1275:converting 1243:system or 1217:isocyanate 689:March 2021 677:relocating 630:March 2021 614:improve it 568:March 2021 538:newspapers 467:improve it 289:Xerography 229:Mimeograph 199:Hectograph 71:Techniques 1480:Packaging 1268:viscosity 1123:Operation 1086:UV-curing 796:Evolution 762:Liverpool 618:verifying 473:talk page 139:Mezzotint 1371:Archived 1345:Archived 1279:slitting 1229:deinking 912:register 899:bakelite 848:dot gain 814:Digital 738:printing 159:Aquatint 1264:gravure 1077:ceramic 1068:polymer 864:polymer 766:aniline 756:History 612:Please 552:scholar 124:Etching 1322:  1073:anilox 1064:rubber 1060:relief 1035:tables 839:anilox 830:, and 820:DuPont 802:offset 742:relief 554:  547:  540:  533:  525:  1062:in a 891:Kodak 824:Kodak 734:flexo 559:JSTOR 545:books 1320:ISBN 887:Esko 832:Esko 828:XSYS 531:news 398:1991 388:1986 378:1981 368:1972 343:1969 333:1957 323:1950 313:1949 303:1940 293:1938 283:1925 273:1923 263:1911 253:1907 243:1889 233:1885 223:1884 213:1875 203:1860 193:1843 183:1837 173:1796 163:1772 153:1690 143:1642 103:1430 93:1040 1075:or 1066:or 675:or 616:by 514:by 83:200 1476:: 1399:. 1386:^ 1369:. 1343:. 1057:3D 889:, 826:, 822:, 476:. 354:c. 129:c. 114:c. 1409:. 1380:. 1354:. 1328:. 1301:. 720:) 714:( 702:) 696:( 691:) 687:( 683:. 669:. 643:) 637:( 632:) 628:( 610:. 581:) 575:( 570:) 566:( 556:· 549:· 542:· 535:· 508:. 483:) 479:( 428:e 421:t 414:v 34:. 20:)

Index

Flexographic
Flexo (Futurama)

History of printing

Woodblock printing
Movable type
Intaglio (printmaking)
Printing press
Etching
Mezzotint
Relief printing
Aquatint
Lithography
Chromolithography
Rotary press
Hectograph
Offset printing
Hot metal typesetting
Mimeograph
Daisy wheel printing
Photostat and rectigraph
Screen printing
Spirit duplicator
Dot matrix printing
Xerography
Spark printing
Phototypesetting
Inkjet printing
Dye-sublimation

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