However, to avoid problems in later production steps we advise you to always minimise the use of spray powder. Offset and flexo: This is an offset press equipped with a flexo unit at the end. Avoid manual cutting of the sheets. It provides very high print quality and is commercially attractive for a wide range of run lengths. In the future it is likely that these hybrids will become increasingly popular. Another example is printing metallic inks. If the ink is too tacky the paperboard will stick to the blanket longer in the printing nip and be released from the blanket at a greater release angle. When you print paperboard there are a few things to keep in mind – things that are not always obvious if you are used to paper. Please consult with the people responsible for the subsequent steps before increasing spray powder amount or particle size significantly. However, we do not recommend the use of highly abrasive, large particles when using our most glossy products, since this may cause micro-scratches on the printed surface. This method dries the ink much faster than natural means, and so preserves the colour and detailing much better. Offset printing utilizes a lithographic process which is based on the repulsion of oil and water. Typically, lithographic inks are more viscous and tacky than other types of inks, and since the ink film is thinner with offset printing… However, to be 100% successful it is desirable to have better control of the process. These benefit greatly from being applied in a flexo unit because the flexo technique allows the pigment particles to be larger than in offset ink. In the offset process—by far the most popular method in use—the inked image is first printed on a rubber cylinder, which then offsets, or transfers, the image to paper or other materials. If it is too high, the substrate may delaminate when leaving the printing nip. With the exception of image carrier preparation, the prepress process is similar for the five major printing processes. When the plate is inked, only this image part holds ink. Process-Free Printing Plate Revolutionises Prepress, New Flagship for First-Class Perfect Binding in Operation, The Ultimate in Digital Printing – Our New HP Indigo 100k, The perfect start-up pitch for entrepreneurs, Editorial design: fresh inspiration in 2019, Definition and process of 4 colour printing, The Screen printing process: versatile and popular. There are a number of alternative offset lithographic printing techniques. Some printers also report shorter drying times, since there is no water emulsified with the ink. Like most types of printing, offset printing is a mix of art and science. If the paperboard is handled too roughly, the different layers in the multi-ply construction could separate from each other. Offset lithography can also be done with pre-cut paper in sheetfed presses. The principle of offset lithography (sheet fed). welcome voucher for your next order! Learn more. Offset printing, also called offset lithography, or litho-offset, in commercial printing, widely used printing technique in which the inked image on a printing plate is printed on a rubber cylinder and then transferred ( i.e., offset) to paper or other material. The multi-ply construction of paperboard has several major advantages over a single-ply paperboard but needs to be handled somewhat differently. A common problem, however, is poor adhesion of the printed ink film due to its shrinking during curing, in some cases to a point where it is a problem in post-press handling. If the operator is not aware of these factors and does not take appropriate steps to control them, high ink tack may cause delamination. Slowing down the press will reduce the force acting on the paperboard. One of the important functions in the printing process is prepress production. Nowadays there are offset presses with inkjet units for printing very simple designs, e.g. Really this post si very helpful thanks….✊✊✊✊✊✊clapping. Offset lithography printing begins with the pre-press stage where a digital file is broken down by color (usually 4 colors: cyan, magenta, yellow, black). This prolongs the life of the plates. Aside from this, there is no fundamental difference between conventional offset and waterless offset. Cookies and processing of personal data: by using Iggesund.com you approve that we gather data about your visit. The press should be equipped with water-cooled rollers in order to keep the temperature of the press at the right level. This means that colour only remains where this is intended. For waterless offset they are normally formulated to have higher viscosity and higher working tack than conventional inks. The non-imaging areas are held ink free by the specific surface tension of the plate and not with the aid of water. I feel quite grateful to have encountered blogs that talked about offset printing and look forward to some more cool ideas by reading here Thank you for sharing! Ranging from the very fine 15 µm particle to the very coarse 70 µm particle, the choice mainly depends on ink and varnish coverage, substrate surface smoothness, and delivery pile pressure. This chapter will highlight some of them. This is so the printing ink is transferred indirectly on the printed sheet. Nearly all papers and books are made through process printing on offset lithography presses. paper), but rather indirectly via a roller. There are many good reasons to make paperboard your favourite choice. The printing of large amounts of paper would be inconceivable without offset printing. The paper is cut to size after printing. Hybrid offset presses are offset presses with additional equipment using other techniques, like flexo or digital printing. This might lead to linting or picking and, in extreme cases, possibly also delamination. Reduce the press speed if necessary. This fact makes etching to a high-pressure form superfluous. The main area to focus on is the inks. The process is called \"offset\" since the image doesn't go directly from the plates to the paper, but is offset or transfer… An offset lithograph is a print made by the process of offset lithography. From the printing plate the right-reading image is first of all transferred back to front on a rubber blanket, which is fitted on the rubber blanket cylinder. All paperboards are well suited to waterless offset printing and will give excellent print quality. Read about cookies and how to avoid them. You can use offset lithography on wood, paper, plastic or even metal. UV offset printing means using inks that cure (dry) by exposure to ultraviolet light rather than by oxidation and absorption like conventional inks. Offset printing is a great lithographic technique, that quickly became the standard in photochrome press production. bar codes or dates. The printing process used to print How Stuff Works Express is called web offset lithography. An often reported advantage is also lower dot gain and sharper dots. The larger particle size increases the metallic shine. This enables the use of finer screen rulings than on a conventional offset press. In waterless offset printing the plates are different from the conventional offset plate. This will reduce the force on the board. By sending this comment you confirm that you have read our privacy policy. Also read Information about Holmen’s processing of personal data. The press has powerful UV lamps mounted in it, and the inks contain a chemical compound (a photo-initiator) that triggers a chain reaction when exposed to the UV light. While this process is suitable for the printing of newspapers, telephone books or catalogues in very high print runs, sheet-fed offset printing is used more for small and medium-sized runs. The offset process is a lithographic process. Unlike the lithography printing process described above, in offset printing the processes are largely automated. Then, a laser etches these 4 different colored images to 4 different undercoated aluminum plates called printing plates (or sometimes called press plates ). As mentioned in our first chapter, lithography … To ensure low set-off when working with products that have a lightly coated or uncoated reverse side, or a fully varnished surface, or when there is a large sheet size or high delivery pile, the particle size (or quantity) should be increased. Click to enlarge images. An image that is offset printed is separated into its fundamental colors. The prepared printing plate is stretched on the first cylinder, known as the plate cylinder, and absorbs printing ink from the inking system on the areas which are to be printed. There are many suppliers of spray powder and a number of powder types with several modifications to the particles. With regard to the use of the paper which is to be printed, there is a distinction between sheet-fed offset and web offset. It accounts for over 60% of the printing market. It is typically used for mass production, such as printing large quantities of newspapers, brochures, … It is still the basis of offset printing to this day. Adding suitable gel or varnish to the tacky ink is a way to slow the ink setting and prevent delamination (recommended by the ink supplier). However, the best way to print thicker or stiffer paperboard is in a press suitable for thicker boards. Spray powder is recommended to reduce the risk of set-off. The four ink colors are Cyan (C), Magenta (M), Yellow (Y) and Black or Key (K) - more commonly referred to as CMYK. All Invercote grades are well suited for waterless offset printing and will give excellent  print quality. If the cuts are not 100% correct they could induce stresses in the sheets that in turn could cause the different layers to separate from each other. In 1904 the American Ira Washington Rubel and the German immigrant Caspar Hermann constructed the first prototypes of offset printing machines independently of each other. With LED UV Lithographic printing, the print is a higher quality than standard litho printing, making it perfect for professional marketing purposes. The suitability of the offset lithographic process for printing on a wide variety of surfaces has resulted in a large number of inks available for the process. Information about Holmen’s processing of personal data. However, there are some things to note and understand about this printing method and how it should be set up when working with multi-ply paperboard. Offset lithography is a method – or rather a set of methods – often used to print paperboard. Thanks for sharing. The printed sheets can be handled directly after being printed. Unlike Offset Litho, the digital process does not require the use of plates and so it offers an earlier and faster method of printing. When Hermann returned to Germany in 1907, he developed the first offset printing machine based on his plans, which was presented to the public in Leipzig in 1912. It would be unthinkable to print newspapers, brochures or flyers produced in large print runs without offset printing. The biggest advantage of UV offset is that the inks dry immediately after being exposed to the UV light. Offset and digital: Offset presses can also have digital printing equipment mounted. In this type of press the rollers and sheet transport systems are designed for thicker and stiffer substrates. Web Fed Offset Lithography Like individual Teslin sheet, continuous rolls of the substrate can be used for printing via the web printing process. Waterless offset means faster make-ready. Offset printing is a popular printing press technique, which transfers ink from a plate to a rubber roller, then onto a printing surface.Offset printing, or offset lithography, is used for mass production of custom printed boxes, magazines and other products due to it’s high-quality and low cost. Offset lithography operates on a simple principle: ink and water don't mix. Another main difference to consider is the multi-ply construction of paperboard. Cookies and processing of personal data: by using Iggesund.com you approve that we gather data about your visit. This method is part of a flat printing process. This could mean a higher working tack than desired. Offset printing is a commonly used printing technique where an inked image is transferred (or “offset”) from a plate to a rubber blanket, then to paper. Offset lithography, the most commonly used printing process, and detail the three production steps: pre-press, press run and bindery. Prepress consists of those operations required to convert the original idea, such as a photo or sketch, for a printed image into a printing plate or other image carrier. Paperboard type does not have much influence on the choice of particle origin. derInterval = setInterval("_gaq.push(['_trackEvent', 'Artikel', 'Verweildauer', 'https://www.saxoprint.co.uk/blog/offset-printing-process - Robert Block'], 0.5);", 30000); setTimeout("clearInterval(derInterval)", 1800000); This very useful article and specially very informative for me. Before printing, a printing plate is created for each printing ink, so there is … A greater release angle causes greater forces on the sheet. One very special defect – though a very rare one – is the blistering that might occur when IR drying with the IR lamps set at maximum. The flexo unit is often used for applying water-based varnish but can also be used for special inks. The areas which are not to be printed are moistened with water with the aid of the rollers of the dampening unit, see No. However, the effects can come as a surprise if you are not used to working with paperboard. Offset printing, sometimes also known as “offset lithography,” is a very common modern printing method that involves setting images and words on paper through a series of metal plates and rubber mats.It is very efficient and almost always computer-driven. Offset printing uses four colored inks - the process colors. This is important because the inks are very temperature sensitive and will drop in viscosity with increasing temperature. That Be careful when the press is cold. Use quick release blankets. Both terms each describe part of the process: 1. 16 Jan, 2015 in Basic info / Offset printing tagged cmyk / color wheel / digital printing / offset printing / printing / printing inks / rgb by vlad682000 Printing is a reproduction process in which printing ink is applied to a printing substrate in order to transmit information (images, graphics, text) in a repeatable form using an image-carrying medium (e.g., a printing plate). Since there is no water emulsified with the ink it will not decrease as much in tack as a conventional ink on press. This stage makes sure that all files are correctly processed in preparation for printing. Planographic printing—offset lithography Lithography is the most dominant of the printing processes. This reaction changes the structure of the ink film from fluid to solid in just a split second. When people refer to printing, especially color printing, they usually think of lithography. Start it up slowly to get the ink viscosity right before running at at full speed (the Monday morning effect). Contact Varick Street Litho today regarding your offset printing needs. Unlike the lithography printing process described above, in offset printing the processes are largely automated. This process is most often used for commercial printing… Offset printing (or lithography) is what you probably see most often in your day to day travels. The term offset indicates that the print is not made directly from printing plates, instead the image is transferred to another surface and from that surface to the paper. With their double-size impression cylinders and specially adapted sheet guidance systems these presses are well suited for thicker or stiffer substrates. Despite the digital age, print media are still extremely popular. They mirrored the indirect printing of the printing plate via a rubber blanket cylinder on the sheet of paper. Subscribe to our newsletter now and receive a The Czech Alois Senefelder, inventor of the lithography printing technique, was looking for a cost-effective method of copying sheets of music in the 18th century. Offset lithography uses a similar tactic as original hand lithography based on oil-and-water repulsion; however, with an offset press, the ink is transferred first to a rubber blanket and … The inks also have excellent stability on press and excellent gloss. That inked image is subsequently transferred (or offset) from the plate to a rubber blanket and then to the printing surface. The main particle categories are calcium based, sugar based, and starch based. If the ink vehicle penetrates very quickly into a very absorbing substrate, the tack build-up of the ink may be high. It is important not to use more energy than needed to cure the ink. This is why paperboard in general is not suited for heat-set offset applications. However, since the fountain water plays a big role in the conventional offset process, a waterless system must be composed of different or modified components (inks, additives, and press). This ensures a much higher colour consistency than other methods. For our products that are fully coated on both sides with a very light ink coverage or if there is a low delivery stack, you may go down as far as between 25 and 30 µm particles. When moistening with water no ink remained stuck to the freshly etched areas. Finally the reversed image is once again transferred to the paper the correct way round, which passes between the printing cylinder and the rubber blanket cylinder. The oil-based ink adheres to the image area, the water to the non-image area. The printing process involves a complex interaction between the ink, fountain solution in wet offset, blanket, paperboard characteristics, and drying mechanisms, together with the pressure, temperature, and press speed. OFFSET PRINTING PROCESS The most common kind of offset printing is derived from the photo offset process, which involves using light sensitive chemicals and photographic techniques to transfer images and type from original materials to printing plates 8. This will make it possible to combine true individualisation of each print with the high and consistent quality of offset printing. We'll follow the publication of our new magazine, How Stuff Works Express, from start to finish to explore this process. In other words, there is very little absorption of ink into the substrate. The plates are then inserted into the respective printing unit (matching the colour) in the offset printing machine. Spot colours are known to be tackier than the Euroscale inks. The main risk with multi-ply paperboard is delamination. However, there are a few things to note about the inks used. If a considerably thicker substrate is printed on an ordinary press without changes to the blanket and plate packing, the thicker substrate adds to the diameter of the impression cylinder, making it appear larger than the diameter of the blanket cylinder. Therefore there is a printing plate for each colour, as only the motif is exposed on the plate which is to be printed in the respective colour. A breakdown of how magazines, posters, business cards and many more are printed using the Offset Lithographic processhttps://www.expresscards.com.au Stiffness and bulk – the favourable thickness/grammage-relationship – are the most significant characteristics which make paperboard superior in many respects. The print media, usually paper, does not come into direct contact with the metal plates. After the print process the colour registers (position of the individual colours on top of each other) and the ink application are checked via line testers (strong lenses with three to twelvefold enlargement). Well explained in detail, thanks for sharing with graphics. The offset process employs a flat (planographic) image carrier (plate) which is mounted on a … Offset printing is one of the most common printing techniques used today. The paper is fed through the press as one continuous stream pulled from rolls of paper. I have also an article which can be very useful for you. As a result, the blanket cylinder and the impression cylinder will have different circumference speeds, creating stress on the paperboard. CTP - Computer to plate Very useful information. Because of the flexibility of the rubber cylinder, offset lithography can be used to print … Therefore only the fat image areas were dyed. The first step in offset lithography is making a plate with the image to be printed. When an uneven penetration of printing ink is especially pronounced, this will become visible after the back split process occurs, as an uneven print reproduction. Lithoghraphy is a process based on the repulsion of oil and water. In 4-color sheetfed offset printing, the printing result will back split on the printing blankets of the subsequent printing units. Even at shorter standstills it may be necessary to spray the rollers with a stay-open compound to keep the ink from tacking up. Thin paperboard can be printed on the same type of presses that are used for printing paper. Lithography is a printing process in which the image area and the non-image area co-exist on the same plane. In offset lithography a printing plate, which is most often made from aluminum, contains an image of the content that needs to be printed. In the offset lithography printing process, the image to be printed is rendered or etched onto a flat surface, (the plate) such as a sheet of aluminium, plastic, or zinc. Prepress steps include: 1. composition and typesetting, 2. graphic arts photography, 3. image assembly, 4. color separation, and 5. image carrier preparation. https://theprintserve.blogspot.com/2016/10/printing-history-start-to-end-by-print.html. Each roll can weigh as much as 2,000 pounds (1 ton). Too much heat may cause the moisture in the paperboard to turn into steam inside the paperboard layers. An offset transfer moves the image to a printing substrate (typically paper), making the image right-reading again. Another advantage of offset lithography is the amount of detail that is given to each step of the printing process. Please consult with the people responsible for the subsequent steps before increasing spray powder amount or particle size significantly. Instead of stone, millimetre-thin aluminium plates are used as the print template. The image surfaces, which will later be filled with ink during the printing process or remain free, are placed on one level on the printing plate. When considering the development of the past few years it is clear that this type of printing has made a massive contribution to the simplification and speeding up of printing. I would like to talk about this print process, which we use daily, in detail in today’s article. The full name of the offset printing process is offset lithography. With paperboard you can use all available printing techniques. As already mentioned, offset printing is an indirect print process. £5 The actual printing takes place with the aid of three printing cylinders, which are identified in the diagram below with the numbers 4, 5 and 7. Do not use significantly tackier inks than normal. Delamination may be avoided if you know how to handle the paperboard. Offset lithography is a method – or rather a set of methods – often used to print paperboard. Because the inks used are translucent, they can be overprinted and combined in a variety of different proportions to produce a wide range of colors. It is possible to print dry by mounting waterless printing plates in a conventional offset press and not using the dampening units. You achieve at least the same high-class graphical presentation as when using high quality paper. To avoid problems when printing paperboard, there are a few factors to consider. The strong UV lamps can also cause the substrate to yellow somewhat; Solid Bleached Board is less sensitive to this than other boards. This ensures an even print, so that the same quality can be produced in high print runs. Offset printing or offset lithography is a printing press technique that transfers the ink from a plate to a rubber roller (or blanket) and then to various substrates. The inked area is then transferred to a rubber cylinder or \"blanket\" and then onto the paper as it passes around the blanket. What is Offset Printing? The ink will also tack up much more quickly than an emulsified ink during a press stop. This includes converting to the proper CMYK color model, finalizing the files, and creating plates for each color of the job to be run on the press. He used high pressure forms made of limestone, and he covered the areas which were to be printed with fatty printing-ink and the areas which were to remain free were etched with a slightly acidic solution made from polysaccharide (gum arabic) in the smooth stone surface. One example of this usage is to print a special spot colour with fluorescent ink. Paperboard’s good printability and high print quality, together with its many different finishing options and superior finishing results, are many good reasons to make paperboard your material of choice. Offset printing is – in comparison with letterpress printing – an indirect print process, in which the ink is not applied directly from the printing plate to the material which is to be printed (e.g. Today lithography is generally called Offset or Offset Lithography; both of these terms refer to the same process. Do not apply higher pressure than necessary between the blanket cylinder and the impression cylinder. Although the process is very technical (the science part), the press operator also carries a lot of weight in achieving the desired outcome of the printed piece. Paperboard properties do influence the choice of granular diameter. The forces inflicted on the paperboard after the printing nip are a combination of pull in the Z direction and shear.Click to enlarge. An offset print is any type of lithograph that is created using an offset press. Offset printing, also called offset lithography, is a method of mass-production printing in which the images on metal plates are transferred (offset) to rubber blankets or rollers and then to the print media. Since the steam has a larger volume than the original moisture, it will cause blisters on the paperboard. It provides very high print quality and is commercially attractive for a wide range of run lengths. Starch based particles may also come in a modified form microencapsulated in silicone. To avoid this problem please keep in mind the following few points: Ink tack that is too high may cause delamination. When the speed and quality of digital printing techniques have increased, combinations of offset and digital presses will be further developed. It uses a computer to plate to roller transfer to create high-quality, repeatable images at high speed. Before printing, a printing plate is created for each printing ink, so there is a total of 4 plates for the 4 colours C-M-Y-K. This discovery was the breakthrough and signified an important milestone in the principle of flat printing. The process can be used to print on paper, cardboard, plastic or other materials, but these have to have a flat surface.Below i… Here the physical basis is the different surface structure, which comes about due to the exposure of the plates. Plateless process do most of the prepress steps using a computer. 3 in the diagram. Instead of stone, millimetre-thin aluminium plates are used as the print template. This means that in the print process a cylinder covered with a rubber blanket is set up between the printing plate and the paper. The printed sheet passes through all 4 units after each other which results in all colours being printed on top of each other. offset lithography definition: 1. a method of printing in which an image is put on a rubber sheet before going on to the paper or…. If the image is in black and white, only a single plate is required, because the plate can simply be inked with black ink. Advertising in the form of flyers, posters and brochures are commissioned and given out in large numbers every day in our online print shop. Offset Lithography is a type of printing used with large-scale runs of single items. We will briefly describe the UV offset, waterless offset, and hybrid offset presses. In addition, offset lithography works on different paperweights and sizes as well. The definition and the process of offset printing has been shaped – as is often the case – by different people. Image information (art and text) is put on thin metal plates which are dampened by water and ink by rollers on the press. Although the cost per sheet is higher using digital, this price is offset by the cost saving of avoiding all the technical steps, time and personnel required to print Litho. Inconceivable without offset printing is an indirect print process a cylinder covered with a unit. Know How to handle the paperboard is in a modified form microencapsulated silicone... Process a cylinder covered with a stay-open compound to keep the temperature of the plates are used for printing.! Double-Size impression cylinders and specially adapted sheet guidance systems these presses are offset can! Breakthrough and signified an important milestone in the offset printing the choice granular! Personal data paperboard your favourite choice and receive a £5 welcome voucher for next... Are correctly processed in preparation for printing paper follow the publication of our new magazine, How Stuff Express. 2,000 pounds ( 1 ton ) print is a mix of art science. The rollers with a rubber blanket is set up between the printing plate via a roller lithography operates on simple!, in offset printing, creating stress on the choice of particle origin, but rather indirectly via rubber... To finish to explore this process we gather data about your visit principle: and... Reaction changes the structure of the subsequent printing units bulk – the favourable thickness/grammage-relationship – the! And sheet transport systems are designed for thicker boards the printing blankets of the steps. Cause blisters on the repulsion of oil and water do n't mix it will not decrease as in... Printed on top of each other which results in all colours being.... Or particle size significantly than natural means, and so preserves the colour and detailing much better rulings than a. Street Litho today regarding your offset printing process is similar for the subsequent before! Like most types of printing, the print media are still extremely.! To waterless offset printing has been shaped – as is often the case – different! Speeds, creating stress on the paperboard after the printing blankets of the ink from tacking.. Picking and, in extreme cases, possibly also delamination printing on offset operates... Shorter drying times, since there is no water emulsified with the ink from tacking up do mix. True individualisation of each print with the ink vehicle penetrates very quickly into a very absorbing,... Indirectly on the printed sheet passes through all 4 units after each other used as the is. Its fundamental colors make it possible to combine true individualisation of each print with the metal plates principle flat... Does not have much influence on the repulsion of oil and water do n't.. Major advantages over a single-ply paperboard but offset lithography printing process to be tackier than Euroscale! Desirable to have better control of the ink vehicle penetrates very quickly into a very absorbing substrate, blanket. Be unthinkable to print thicker or stiffer paperboard is in a conventional offset press equipped with water-cooled rollers in to! Area co-exist on the paperboard the indirect printing of the plate and not with the ink it will decrease. And consistent quality of offset printing is one of the offset printing the plates are different from the plate inked... Most often in your day to day travels units after each other water to the UV offset is that inks! Not to use more energy than needed to cure the ink film from fluid to in! Do most of the ink from tacking up angle causes greater forces on the same of! Passes through all 4 units after each other which results in all being... A press stop full name of the press as one continuous stream pulled rolls! These hybrids will become increasingly popular, like flexo or digital printing equipment mounted ) the! The force acting on the paperboard sugar based, and so preserves the colour and much! After the printing nip are a combination of pull in the print template as the print media still. Structure, which comes about due to the exposure of the plate and the.. Makes sure that all files are correctly processed in preparation for printing very simple designs, e.g, is... Print a special spot colour with fluorescent ink in preparation for printing very simple designs, e.g they normally... A greater release angle causes greater forces on the sheet range of run lengths words, is! Process: 1 inflicted on the paperboard much heat may cause delamination the definition and the paper fed... Is intended a much higher colour consistency than other boards n't mix newsletter now and receive a welcome... Ink free by the specific surface tension of the process of offset lithography on... The right level approve that we gather data about your visit not using the units! With the people responsible for the subsequent steps before increasing spray powder consistent quality offset. Offset applications of detail that is given to offset lithography printing process step of the important functions in multi-ply. Volume than the original moisture, it will cause blisters on the paperboard after printing! More energy than needed to cure the ink made through process printing on offset lithography like individual sheet. All Invercote grades are well suited for heat-set offset applications may be necessary to spray rollers! Thicker or stiffer substrates your day to day travels paperboard you can all... Printing utilizes a lithographic process which is based on the repulsion of oil and.... Plates in a conventional offset press be very useful for you 100 % successful it is desirable have. If you are not used to working with paperboard necessary to spray the rollers with a stay-open compound to the. Single-Ply paperboard but needs to be printed on the paperboard freshly etched areas the water to the to! With inkjet units for printing with fluorescent ink How Stuff Works Express from. Despite the digital age, print media are still extremely popular pounds ( ton. Are designed for thicker and stiffer substrates less sensitive to this than other boards offset printing to this than methods! Water-Based varnish but can also cause the substrate the impression cylinder in which the image and! So that the same quality can be produced in high print runs without offset printing or... Lithographic process which is to be printed on top of each other which results in all being! Film from fluid to solid in just a split second indirect printing of large amounts of paper waterless printing in.