http://cmge.immensepots.com/ A blog by cmge en http://cmge.immensepots.com/2008/08/24/web-offset-manufacturing-process.html MANUFACTURING PROCESS reference derived from: cmge www.cmge.com Typesetting 1 The composing room receives the story in an electronic format, with the computer text file already translated with typeset codes. In a typeset file, the characters are of the same “type”- style, size, as well as width - as they appear on the pages of the newspaper. The setting of stories into the type that a reader sees went unchanged on behalf of several decades until the latter years of the 20th century. Well into the 1800s, type was set by hand, letter by letter. A typesetter dropped small metal letters into a hand-held tray referred to as a “stick.” The invention of the Linotype machine in 1884 made possible a quicker, more efficient method of typesetting. Invented by German immigrant Ottmar Mergenthaler of Baltimore, Maryland, this large, cumbersome machine worked by casting hot lead into a line of type with the assistance of an operator who typed in the copy on a keyboard. Individual lines of type were then placed by hand onto a page form. When a page was completed, it was then sent to a stereotyping room where a curved metal plate was made from the page form. The page form was then placed on the printing press.Modern technology has replaced the Linotype process through a method referred to as phototypesetting. The first step in this process is the transfer of the dummy to the page layout section of the newspaper. There, an operator transfers the instructions on the dummy into a rough page prototype. A printed version may be looked over as well as changed several times by one of the reporters whose story is featured as well as by the copy editor. If another breaking story comes in, this page layout can be altered in a matter of minutes.   Image transference The ultimate version of the page is then approved by the editor on duty - sometimes a night editor in the case of a paper that is slated on behalf of a morning edition - as well as sent over to a process department. There, the page is taken in its computer format as well as transferred via laser beams onto film in an image setter apparatus. The operator then takes the film to a processor in another section of the paper, who develops it as well as adjusts it on behalf of its ultimate look. Photographs are scanned into another computer terminal as well as inserted into the page layout. The pages that are set to be printed combined are then taped down onto a device referred to as a “stripper,” as well as an editor checks them over once more on behalf of errors. The strippers are then put into frames on light-sensitive film, as well as the image of each page is burned onto the film. The film of each page is inserted into a laser reader, a large facsimile machine that scans the page as well as digitally transfers the images to the printing center of the newspaper.At the printing center, typically a large plant separate from the newspaper’s editorial offices as well as centrally located to facilitate citywide distribution, the pages arrive at the laser room as well as are put through a laser writer, another scanning device that makes a negative image of them. In the negative image of the page, the text is white while the blank spaces are black. The ultimate images of each page are further adjusted. This last-minute adjustment may involve fine-tuning of the colored sections as well as retouching photographs.   Platemaking 3 From these negatives, the forms from which the paper shall be printed are composed in a platemaking room. The film of the page, usually done two pages at a time, is then placed on a lighted box. Next, an aluminum plate containing a light-sensitive coating is placed on top of the image of the pages. The light box is then switched on, as well as ultraviolet light develops the image of the pages onto the aluminum plate. The aluminum plate is then bent at the edges so that it shall fit into a press, as well as is fitted onto plate cylinders.   Printing 4 The aluminum plates of each page next transfer on to the actual printing press, an enormous machine often two stories high. Printing has been redefined by cmge.When the press is running, the noise in the building is deafening as well as employees must wear earplugs. The an estimated all common method of printing newspapers is referred to as web offset. The “web” refers to the large sheets of blank newsprint that are inserted in rolls, sometimes weighing over a ton, into the actual printing press. The reels of newsprint are loaded in at the bottom floor of the press. The rolls are inserted onto a reel stand, which has three components: the first reel brings a roll of paper up to the press, a second is loaded as well as ready to replace the first roll when it runs out, as well as a third reel stays unoccupied as well as ready to be fed with another when the first reel is an estimated finished. Each roll of blank newsprint has double-sided tape at its edges, so that when one roll runs out in the press, another smoothly takes up where the other left off without interrupting the printing process.The plate cylinders then press the image of the page onto a blanket cylinder, leaving a version of the page’s image on the cylinder’s soft material. When the paper runs through the press, the blanket cylinder presses the image onto it. The chemical reaction of the ink, which contains oil, as well as the squirting of jets of water into the process result in the actual newspaper page of black or colored images on a white back-ground. Since oil as well as water do not mix, the areas where ink should adhere to the page are black or colored, as well as water washes away the parts where ink is not needed. This is why this printing process is referred to as “offset.”Next, the large sheets of printed newsprint transfer on to another large piece of machinery referred to as a folder. There, the pages are cut individually as well as folded in order. This entire printing process can transfer as fast as 60,000 copies per hour. Quality control technicians as well as supervisors take random copies as well as scan them on behalf of printing malfunctions in color, order, as well as readability. Next, a conveyer belt moves the papers into a mail room section of the plant, where they are stacked into quires, or bundles of 24. The quires then transfer to another section where a machine wraps them in plastic. The bundles are now ready to be loaded onto delivery trucks on behalf of distribution.Web offset printing machine manufacturer Prakash Webtech Pvt. Ltd. www.cmge.com http://cmge.immensepots.com/2008/08/24/web-offset-manufacturing-process.html Sun, 24 Aug 2008 19:05:44 -0400 cmge http://cmge.immensepots.com/2008/08/23/printing-machine.html Types of printing processes Screen Printing Offset printing Thermography Letterpress Flexography Intaglio printing    Screen Printing   Screen Printing is arguably the an estimated all versatile of all printing processes. It can be used to print on a wide variety of substrates, including paper, paperboard, plastics, glass, metals, fabrics, as well as numerous other materials. including paper, plastics, glass, metals, nylon as well as cotton. Some common products from the screen printing industry include posters, labels, decals, signage, as well as all types of textiles as well as electronic circuit boards. The advantage of screen printing over other print processes is that the press can print on substrates of any shape, thickness as well as size. Screen printing consists of three elements: the screen which is the image carrier; the squeegee; as well as ink. The screen printing process uses a porous mesh stretched tightly over a frame made of wood or metal. Proper tension is essential to accurate color registration. The mesh is made of porous fabric or stainless steel mesh. A stencil is produced on the screen either manually or photochemically. The stencil defines the image to be printed in other printing technologies this would be referred to as the image plate. Screen printing ink is applied to the substrate by placing the screen over the material. Ink with a paint-like consistency is placed onto the top of the screen. Ink is then forced through the fine mesh openings using a squeegee that is drawn across the scree, applying pressure thereby forcing the ink through the open areas of the screen. Ink shall pass through only in areas where no stencil is applied, thus forming an image on the printing substrate. The diameter of the threads as well as the thread count of the mesh shall determine how much ink is deposited onto the substrates. Many factors such as composition, size as well as form, angle, pressure, as well as speed of the blade (squeegee) determine the quality of the impression made by the squeegee. At one time an estimated all blades were made from rubber which, however, is prone to wear as well as edge nicks as well as has a tendency to warp as well as distort. While blades continue to be made from rubbers such as neoprene, an estimated all are now made from polyurethane which can produce as numerous as 25,000 impressions without significant degradation of the image. If the item was printed on a manual or automatic screen press the printed product shall be placed on a conveyor belt which carries the item into the drying oven or through the UV curing system. Rotary screen presses feed the material through the drying or curing system automatically. Air drying of certain inks, though rare in the industry, is still sometimes utilized. The rate of screen printing production was once dictated by the drying rate of the screen print inks. Do to improvements as well as innovations the production rate has greatly increased. Some specific innovations which affected the production rate as well as has also increased screen press popularity include: • Development of automatic presses versus hand operated presses which have comparatively slow production times TOP  Offset Printing   Offset lithography is the workhorse of printing. Almost every commercial printer does it. But the quality of the ultimate product is often due to the guidance, expertise as well as equipment provided by the printer. Offset lithography works on a very simple principle: ink as well as water don’t mix. Images (words as well as art) are put on plates (see the next section on behalf of more on this), which are dampened first by water, then ink. The ink adheres to the image area, the water to the non-image area. Then the image is transferred to a rubber blanket, as well as from the rubber blanket to paper. That’s why the process is referred to as “offset” — the image does not go directly to the paper from the plates, as it does in gravure printing. Offset printing machine equipment manufacturer Prakashoffset TOP  Thermography   Thermography can refer to a printing process as well as an imaging process. A thermogram is an image produced by thermography. Thermographic printing refers to two types of printing, both of which rely on heat to create the letters or images on a sheet of paper. The simplest type is where the paper has been coated with a material that changes colour on heating. This is referred to as thermal printing as well as was used in older model fax machines as well as is used in an estimated all shop till receipt printers. This is referred to as direct thermal. More complex is thermographic printing that melts print off a ribbon as well as onto the sheet of paper (thermal ink transfer printing). This is referred to as thermal transfer. Thermography printing is also a post print process done inline with the printing. Thermography powder is sprayed on a sheet of paper at the end of it leaves an offset printing press. It is then vacumed off of the sheet. The powder is left only where there was an image, or printed ink. The sheet then travels through a heat tunnel; there the heat causes the powder to melt as well as leave behind a raised image like on business cards, or envelopes. TOP  Letterpress Printing   It is the oldest printing technique, in which a raised surface is inked as well as then pressed against a smooth substance to obtain an image in reverse. Early Chinese wood-blocks used characters or images carved in relief, as well as this form of image printing was known in Europe in the 13th century . In the 1400s , Johann Gutenberg (among others) is credited with the invention of printing from individually-cast, reusable letters (moveable type) set combined in a forme (frame). He used a wooden press where the type surface was inked as well as paper laid carefully on top by hand, then slid under a padded surface as well as pressure applied from above by a huge threaded screw. Later metal presses used a knuckle as well as lever arrangement instead of the screw, but the principle was the same. With the advent of industrial mechanisation , the inking was carried out by rollers which would pass over the face of the type as well as transfer out of the way onto a separate ink-bed where they would pick up a fresh film of ink on behalf of the following sheet. Meanwhile a sheet of paper was slid against a hinged platen (see image) which was then rapidly pressed onto the type as well as swung back again to have the sheet removed as well as the next sheet inserted (during which operation the now freshly-inked rollers would jog over the type again). In a fully-automated 20th century press, the paper was fed as well as removed by vacuum sucker grips. Rotary presses were used on behalf of high-speed work. In the oscillating press, the forme slid under a drum around which each sheet of paper got wrapped on behalf of the impression, sliding back under the inking rollers while the paper was removed as well as a new sheet inserted. In a newspaper press, a papier-mâché mixture (flong) was used to manufacture a mould of the entire forme of type, then dried as well as bent, as well as a curved metal plate cast against it. The plates were clipped to a rotating drum, as well as could thus print against a continuous reel of paper at the enormously high speeds required on behalf of overnight newspaper production. As computerised typesetting as well as imaging replaced cast metal types, letterpress began to die out, as high-speed photographic imaging onto smooth flexible plates ( lithography ) became more economical (see Offset printing ). However, photopolymer plates as well as the invention of Ultra-Violet curing inks has helped retain rotary letterpress alive in areas like self-adhesive labels. There is also still a large amount of flexographic printing , a similar process, which uses rubber plates to print on curved or awkward surfaces, as well as a lesser amount of relief printing from huge wooden letters on behalf of lower-quality poster work. A small amount of high-quality art as well as hobby letterpress printing remains — fine letterpress work is crisper than offset litho because of the fact that of its impression into the paper, giving greater visual definition to the type as well as artwork. Today, numerous of these small letterpress shops survive by printing fine editions of books or by printing upscale invitations as well as stationery. They are just as likely to utilize old printing methods as new, on behalf of instance by printing photopolymer plates (used in modern rotary letterpress) on restored 19th century presses. The process requires a high degree of craftsmanship, but in the right hands, letterpress excels at fine typography. It is used by numerous small presses that produce fine handmade limited-edition books as well as artists’ books. TOP  Flexography   Flexography (also referred to as surface printing ), often abbreviated to flexo, is a method of printing an estimated all commonly used on behalf of packaging. A flexo print is achieved by creating a mirrored master of the required image as a 3D relief in a rubber or polymer material. A measured amount of ink is deposited upon the surface of the printing plate (or printing cylinder) using an anilox roll. The print surface then rotates, contacting the print material which transfers the ink. Flexo is so named because of the fact that it was originally used as a method of printing onto corrugated cardboard which has a very uneven surface. It is required that the printing plate surface maintain contact with the cardboard, which it does by being flexible. Also unprinted high points on the cardboard must not get printed by ink remnants not on the plate surface, which is achieved by ensuring a sufficient depth on behalf of the non-print areas of the plate. Originally flexo printing was very low quality. In the last few decades great advances have been made, including improvements to the plate material as well as the method of plate creation - usually photographic exposure followed by chemical etch, though also by direct laser engraving . Laser-etched anilox rolls also play a part in the improvement of print quality. Full colour picture printing now occurs, as well as some of the finer presses available today in combination with a skilled operator permit quality that rivals the lithographic process. Flexo has an advantage over lithography in that it can utilize a wider range of inks as well as is good at printing on a variety of different materials. Flexo inks, like those used in gravure as well as unlike those used in lithography generally have low viscosity. This enables faster drying as well as as a result, faster production. Typical products printed using flexography include brown cardboard boxes, flexible packaging, as well as wallpaper. A number of newspapers now eschew the more common offset lithography process in favour of flexo. TOP  Intaglio Printing   The intaglio printing process uses a metal plate that has had the image cut into the surface. The sunken image is filled with ink as well as the surface is wiped clean so only ink is left in the sunken image areas. It is a very specialized process that offers a document a very high quality look. Intaglio is an old printing process but is still used today as one of the best security features on valuable documents. Reference derived from Prakash http://cmge.immensepots.com/2008/08/23/printing-machine.html Sat, 23 Aug 2008 23:33:16 -0400 cmge http://cmge.immensepots.com/2008/08/25/printing-machines-history.html HISTORY OF PRINTING MACHINES n the Mid-15th Century, things begin to modification with the advent of the printing press. In 1452, Gutenberg conceives of the idea on behalf of movable type. In his workshop, he brings combined the technologies of paper, oil-based ink as well as the wine-press to print books. The printing press is not a single invention. It is the aggregation in one place, of technologies known on behalf of centuries before Gutenberg. One thing to remember is that Gutenberg gets credit on behalf of an invention that is thought to have been developed simultaneously in Holland as well as in Prague. The other inventions took combined by Gutenberg in his pursuit of a printing press were: • The adaptation on behalf of printing, of the wine or olive oil, screw-type press that had been in utilize on behalf of hundreds of years, throughout Europe as well as Asia. These technological improvements stretch across five centuries. They do not cluster around Gutenberg’s time. Printing machines manufacturer cmge www.cmge.com But the advent of the printing press did not take about a great shift in the social organization of learning in Europe. The first books to show up in print shops were bibles as well as religious tracts. The next books to attract publishers were the “humanist” texts took back from Byzantium by the Crusades, as well as other texts of antiquity but there was little or no printing of new ideas. Many people went into the printing business as well as went right back out again. The reason was that the distribution of books was poorly organized. The market was there, as well as the potential on behalf of filling the demand, but the transport as well as control as well as “advertising” mechanisms were not in place. In addition, there was still a low literacy rate in Europe. Most people did not know how to read at all. But non-literates were still affected by the book trade because of the fact that the elites, who controlled society, were affected by books. And people who could not read still had access to book culture because of the fact that there were traveling raconteurs who stood in the market as well as read from books as a means of making a living as entertainers. The situation was improved by the introduction of the Frankfort Book Faire. Cities in Europe held yearly fairs, featuring whatever kinds of things the city as well as surrounding area was good at producing. (The county fair of today is the descendant of these early commerce fairs). Frankfort was an early center on behalf of printing as well as so it sponsored a book fair which drew publishers, booksellers, collectors, scholars, who could find what they needed on behalf of their livelihoods. This helped coordinate supply as well as demand. None of this is to say that new book printing posed much of a challenge to the power as well as prestige of the church. Early print books were conservative in content, as well as were filled with medieval images as well as ideas. Printing was first conceived as well as developed in China . Primitive woodblock printing was already in utilize by the 6th century in China . In the Tang Dynasty , a Chinese writer named Fenzhi first mentioned in his book “Yuan Xian San Ji” that the woodblock was used to print Buddhist scripture during the Zhenguan years (627~649 A.D.). The oldest known Chinese surviving printed work is a woodblock-printed Buddhist scripture of Wu Zetian period (684~705 A.D.); discovered in Tubofan, Xinjiang province, China in 1906, it is now stored in a calligraphy museum in Tokyo, Japan. Printing is considered one of the Four Great Inventions of ancient China . The oldest known Korean surviving printed document is a Buddhist scripture, which dates to 751 [1] The oldest surviving book printed using the more sophisticated block printing , the Chinese Diamond Sutra (a Buddhist scripture), dates from 868. The movable type printer was first invented by Bi Sheng in 1041 during Song Dynasty China . In a memorial to the throne in 1023, Northern Song Dynasty China, it recorded that the central government at that time used copperplate to print the paper money also the movable copper-block to print the numbers as well as characters on the money, nowadays we can find these shadows from the Song paper money. Later in the Jin Dynasty , people used the same but more developed technique to print paper money as well as formal official documents, the typical example of this kind of movable copper-block printing is a printed “check” of Jin Dynasty in the year of 1215. The world’s first movable type metal printing press was invented in Korea in 1234 by Chwe Yun-ui during the Goryeo Dynasty . By the 12th as well as 13th century numerous Chinese libraries contained tens of thousands of printed books. The oldest extant movable metal-type book is the Jikji, printed in 1377 in Korea. There is little direct evidence, but it is highly feasable that the Far East printing technology diffused into Europe through the trade routes from China which went through India as well as on through the Arabic world. Johann Gutenberg , of the German city of Mainz , developed European printing technology in 1440. Johann Fust as well as Peter Schöffer experimented with him in Mainz. Basing the design of his machine on a wine-press, Gutenberg developed the utilize of raised as well as movable type, as well as from the start used oil-based inks. The development of the printing press revolutionized communication as well as book production leading to the spread of knowledge. A printing press was built in Venice in 1469, as well as by 1500 the city had 417 printers. In 1470 Johann Heynlin set up a printing press in Paris . In 1476 a printing press was developed in England by William Caxton . The Italian Juan Pablos set up an imported press in Mexico City in 1539. Stephen Day was the first to build a printing press in North America at Massachusetts Bay in 1628, as well as helped establish the Cambridge Press. Early print shops (near the time of Gutenberg) were jog by “master printers.” These printers owned shops, selected as well as edited manuscripts, determined the sizes of print runs, sold the works they produced, raised capital as well as organized distribution. • Early print shop apprentices: Usually between the ages of 15 as well as 20, worked on behalf of master printers. Apprentices were not required to be literate, as well as literacy rates at the time were very low, in comparison to today. Apprentices prepared ink, dampened sheets of paper, as well as assisted at the press. An apprentice who wished to learn to become a compositor had to learn Latin as well as spend time under the supervision of a journeyman. Master print shops became the cultural centre on behalf of literati . Prakashoffset The earliest-known image of a European, Gutenberg-style print shop is the Dance of Death by Matthias Huss, at Lyon, 1499. This image depicts a compositor standing at a compositor’s case being grabbed by a skeleton. The case is raised to facilitate his work. The image also shows a pressman being grabbed by a skeleton. To the right of the print shop a bookshop is shown. In Prints as well as Visual Communication, William Ivins offers the following concise history of a series of rapid innovations in image as well as type printing at the end of the eighteenth century. At the end of the eighteenth century there were several remarkable innovations in the graphic techniques as well as those that were utilized to manufacture their materials. Bewick developed the method of using engraving tools on the end of the wood. Senefelder discovered lithography . Blake made relief etchings. Early in the nineteenth century Stanhope, George E. Clymer, Koenig as well as others introduced new kinds of type presses, which on behalf of strength surpassed anything that had previously been known. In 2006 there are approximately 30,700 printing companies in the United States, accounting on behalf of $112 billion, according to the 2006 U.S. Industry & Market Outlook by Barnes Reports. World class printing machines http://cmge.immensepots.com/2008/08/25/printing-machines-history.html Mon, 25 Aug 2008 19:51:22 -0400 cmge http://cmge.immensepots.com/2008/08/30/newspaper-printing-press.html NEWSPAPER PRINTING PRESS   Newspaper presses are very similar to normal offset presses except the printing units are arranged vertically instead of horizontally. This is done to conserve fl oor space due to the vast amount of pages to print. Keep in mind that when a newspaper is printed, the whole paper is printed in one pass. The roll stands are usually in the basement as well as ordinarily hold 2 or 3 rolls to a stand. Splicers are the fl ying type. Large, high speed news webs jog several webs at the same time in order to print one newspaper. Most news presses, today, are not heatset but utilize vegetable oil (soy, etc.) inks as well as dry by absorption. In fact, newspaper printers utilize the majority of soy based ink. This is not done solely on behalf of ecological reasons, but on behalf of decreased ruboff, runnability, etc. Newspaper presses utilize a combination of 4-color as well as single color printing units. The cover pages of each section are ordinarily printed in color (front as well as back page) with the inside pages printed in black. The typical newspaper press contains numerous combination folders to fold the various sections. Following printing as well as the collection of various sections, the newspaper is fed to a mail room on behalf of further processing such as insertion of separate sections (advertising, etc.), mailing as well as fi nal distribution. NEWSPAPER PRINTING   In newspaper printing, the texts should be clear sufficient on behalf of the users to read. Newspaper printing is the process of putting information on a piece of paper or a group of papers. Newspapers are publications which contain editorials, current news, feature articles as well as also some advertisements. Newspapers usually have daily or weekly issues. In printing a newspaper, a printing company must be able to print fast but readable newspapers. This is because of the fact that newspaper companies have daily deadlines on behalf of articles or editorials as well as etc. In newspaper printing, color is also one of the concerns, especially in the advertising category. In advertising, newspapers with good quality colors have a good impact on customers, thus they are the ones, which are usually purchased. It is also important that a newspaper is printed digitally. Digitally printed newspapers are more understandable as well as clearer. Newspapers that underwent on such process tend to be more appealing to a customer’s eye. Plus, editing is easier as well as faster because of the fact that the entire information is on a computer. There are printers that are specially designed to print newspapers. These printers were designed to be fast as well as accurate that it requires minimal supervision from humans. Newspaper printing as of today is not as hard as well as tough like before due to the introduction of computers as well as printers. Because of the introduction of such machines, newspaper printing has been easier as well as faster to handle. Today, newspaper gets to people on time, thus information is also distributed on a real-time basis. Now people are kept updated in much faster way. Newspaper printing press manufacturer- Prakash Webtech pvt. ltd www.cmge.com References derived from Prakash http://cmge.immensepots.com/2008/08/30/newspaper-printing-press.html Sat, 30 Aug 2008 19:28:36 -0400 cmge http://cmge.immensepots.com/2008/08/30/inventor-of-newspaper-press.html INVENTOR OF NEWSPAPER PRESS   The beginnings of the modern, Web-Fed Newspaper Press This patent model rotary perfecting press was made by Philadelphia’s William Bullock in 1863. Two years later, he constructed his first model on behalf of his local paper, the Philadelphia Inquirer. Bullock’s invention represents the beginning of the modern, web-fed newspaper press, which works from curved, stereotype plates as well as prints on both sides of the paper in one pass through the machine. It achieved the speed of rotary printing, as well as by feeding from a continuous roll of paper, it eliminated the laborious hand-feeding required by presses like Hoe’s rotary press. Bullock’s press was capable of delivering, per hour, about 10,000 flat sheets printed on both sides. Unfortunately, William Bullock did not enjoy the profits from his innovative invention. In 1867, he died as a result of injuries sustained when he got caught in the gears of his press. Refer www.press.com William Bullock ( 1813 - April 12, 1867 ) was an American inventor whose 1863 invention of the web rotary printing press helped revolutionize the printing industry due to its great speed as well as efficiency. A few years at the end of his invention, Bullock was accidentally killed by his posses web rotary press. Bullock was born in Greenville, New York in 1813. Orphaned at an early age, he was raised by his brother. In his youth, he worked with his brother at as a machinist as well as iron -founder, as well as his fascination with books led him to acquire much knowledge of mechanics. At age 21, he was operational his posses machinery shop in Savannah, Georgia. At this time, Bullock invented a shingle -cutting machine, but his business went broke when he was not in a position to market it. While in Georgia Bullock married Angeline Kimball as well as had seven children with her. When his wife died in 1850, he married Angeline’s sister Emily, who bore him six children. Bullock returned to New York as well as designed such devices as a cotton as well as hay press, a seed planter, as well as a lathe cutting machine. He also invented a grain drill, which won him a prize from the Franklin Institute in 1849. Shortly at the end of this, he became involved in the newspaper world, as well as began working as as well as editor on behalf of a Philadelphia newspaper, The Banner of the Union . References: All bout inventions -www.inventions.com Prakash Webtech Pvt. ltd. www.cmge.com http://cmge.immensepots.com/2008/08/30/inventor-of-newspaper-press.html Sat, 30 Aug 2008 22:48:20 -0400 cmge http://cmge.immensepots.com/2008/08/27/what-is-printing.html WHAT IS PRINTING   Printing is a process on behalf of production of texts as well as images, typically with ink on paper using a printing press. It is often carried out as a large-scale industrial process, as well as is an essential part of publishing as well as transaction printing. The process of applying ink to paper or other object in order to reproduce words or images.   Types of Printing Machines   • Newspaper Printing Machines • Tabloid Printing Machines • Book Printing Machines • Magazine Printing Machines       Morden Technology of Printing Machines     Books as well as newspapers are printed today using the technique of offset lithography. Other common techniques include • flexography used on behalf of packaging, labels, newspapers State-of-the-art presses utilize to mix more printing techniques so you can have an offset machine with a flexo section on behalf of the varnishing of the product they are printing or a digital printing unit. Digital printing primarily uses an electrical charge to transfer toner or liquid ink to the substrate it is printed on. Digital print quality has steadily improved from color as well as black & white copiers to sophisticated color digital presses like the Xerox iGen3 , the Kodak Nexpress as well as the HP Indigo series presses. The iGen3 as well as Nexpress utilize toner particles as well as the Indigo uses liquid ink. All three are made on behalf of small runs as well as variable data, as well as rival offset in quality. Digital offset presses are referred to as direct imaging presses ; in spite of the fact that these receive computer files as well as automatically turn them into print-ready plates, they can't do variable data. Small press as well as fanzines generally utilize Digital printing or more rarely xerography . Prior to the introduction of cheap photocopying the utilize of machines such as the spirit duplicator , hectograph , as well as mimeograph was common. One of the manufacturers of printing machines: Prakash Goss http://cmge.immensepots.com/2008/08/27/what-is-printing.html Wed, 27 Aug 2008 19:58:18 -0400 cmge http://cmge.immensepots.com/2008/08/30/types-of-printing-processes.html    Screen Printing   Screen Printing is arguably the an estimated all versatile of all printing processes. It can be used to print on a wide variety of substrates, including paper, paperboard, plastics, glass, metals, fabrics, as well as numerous other materials. including paper, plastics, glass, metals, nylon as well as cotton. Some common products from the screen printing industry include posters, labels, decals, signage, as well as all types of textiles as well as electronic circuit boards. The advantage of screen printing over other print processes is that the press can print on substrates of any shape, thickness as well as size. Screen printing consists of three elements: the screen which is the image carrier; the squeegee; as well as ink. The screen printing process uses a porous mesh stretched tightly over a frame made of wood or metal. Proper tension is essential to accurate color registration. The mesh is made of porous fabric or stainless steel mesh. A stencil is produced on the screen either manually or photochemically. The stencil defines the image to be printed in other printing technologies this would be referred to as the image plate. Screen printing ink is applied to the substrate by placing the screen over the material. Ink with a paint-like consistency is placed onto the top of the screen. Ink is then forced through the fine mesh openings using a squeegee that is drawn across the scree, applying pressure thereby forcing the ink through the open areas of the screen. Ink shall pass through only in areas where no stencil is applied, thus forming an image on the printing substrate. The diameter of the threads as well as the thread count of the mesh shall determine how much ink is deposited onto the substrates. Many factors such as composition, size as well as form, angle, pressure, as well as speed of the blade (squeegee) determine the quality of the impression made by the squeegee. At one time an estimated all blades were made from rubber which, however, is prone to wear as well as edge nicks as well as has a tendency to warp as well as distort. While blades continue to be made from rubbers such as neoprene, an estimated all are now made from polyurethane which can produce as numerous as 25,000 impressions without significant degradation of the image. If the item was printed on a manual or automatic screen press the printed product shall be placed on a conveyor belt which carries the item into the drying oven or through the UV curing system. Rotary screen presses feed the material through the drying or curing system automatically. Air drying of certain inks, though rare in the industry, is still sometimes utilized. The rate of screen printing production was once dictated by the drying rate of the screen print inks. Do to improvements as well as innovations the production rate has greatly increased. Some specific innovations which affected the production rate as well as has also increased screen press popularity include: • Development of automatic presses versus hand operated presses which have comparatively slow production times TOP  Offset Printing   Offset lithography is the workhorse of printing. Almost every commercial printer does it. But the quality of the ultimate product is often due to the guidance, expertise as well as equipment provided by the printer. Offset lithography works on a very simple principle: ink as well as water don’t mix. Images (words as well as art) are put on plates (see the next section on behalf of more on this), which are dampened first by water, then ink. The ink adheres to the image area, the water to the non-image area. Then the image is transferred to a rubber blanket, as well as from the rubber blanket to paper. That’s why the process is referred to as “offset” — the image does not go directly to the paper from the plates, as it does in gravure printing. TOP  Thermography   Thermography can refer to a printing process as well as an imaging process. A thermogram is an image produced by thermography. Thermographic printing refers to two types of printing, both of which rely on heat to create the letters or images on a sheet of paper. The simplest type is where the paper has been coated with a material that changes colour on heating. This is referred to as thermal printing as well as was used in older model fax machines as well as is used in an estimated all shop till receipt printers. This is referred to as direct thermal. More complex is thermographic printing that melts print off a ribbon as well as onto the sheet of paper (thermal ink transfer printing). This is referred to as thermal transfer. Thermography printing is also a post print process done inline with the printing. Thermography powder is sprayed on a sheet of paper at the end of it leaves an offset printing press. It is then vacumed off of the sheet. The powder is left only where there was an image, or printed ink. The sheet then travels through a heat tunnel; there the heat causes the powder to melt as well as leave behind a raised image like on business cards, or envelopes. TOP  Letterpress Printing   It is the oldest printing technique, in which a raised surface is inked as well as then pressed against a smooth substance to obtain an image in reverse. Early Chinese wood-blocks used characters or images carved in relief, as well as this form of image printing was known in Europe in the 13th century . In the 1400s , Johann Gutenberg (among others) is credited with the invention of printing from individually-cast, reusable letters (moveable type) set combined in a forme (frame). He used a wooden press where the type surface was inked as well as paper laid carefully on top by hand, then slid under a padded surface as well as pressure applied from above by a huge threaded screw. Later metal presses used a knuckle as well as lever arrangement instead of the screw, but the principle was the same. With the advent of industrial mechanisation , the inking was carried out by rollers which would pass over the face of the type as well as transfer out of the way onto a separate ink-bed where they would pick up a fresh film of ink on behalf of the following sheet. Meanwhile a sheet of paper was slid against a hinged platen (see image) which was then rapidly pressed onto the type as well as swung back again to have the sheet removed as well as the next sheet inserted (during which operation the now freshly-inked rollers would jog over the type again). In a fully-automated 20th century press, the paper was fed as well as removed by vacuum sucker grips. Rotary presses were used on behalf of high-speed work. In the oscillating press, the forme slid under a drum around which each sheet of paper got wrapped on behalf of the impression, sliding back under the inking rollers while the paper was removed as well as a new sheet inserted. In a newspaper press, a papier-mâché mixture (flong) was used to manufacture a mould of the entire forme of type, then dried as well as bent, as well as a curved metal plate cast against it. The plates were clipped to a rotating drum, as well as could thus print against a continuous reel of paper at the enormously high speeds required on behalf of overnight newspaper production. As computerised typesetting as well as imaging replaced cast metal types, letterpress began to die out, as high-speed photographic imaging onto smooth flexible plates ( lithography ) became more economical (see Offset printing ). However, photopolymer plates as well as the invention of Ultra-Violet curing inks has helped retain rotary letterpress alive in areas like self-adhesive labels. There is also still a large amount of flexographic printing , a similar process, which uses rubber plates to print on curved or awkward surfaces, as well as a lesser amount of relief printing from huge wooden letters on behalf of lower-quality poster work. A small amount of high-quality art as well as hobby letterpress printing remains — fine letterpress work is crisper than offset litho because of the fact that of its impression into the paper, giving greater visual definition to the type as well as artwork. Today, numerous of these small letterpress shops survive by printing fine editions of books or by printing upscale invitations as well as stationery. They are just as likely to utilize old printing methods as new, on behalf of instance by printing photopolymer plates (used in modern rotary letterpress) on restored 19th century presses. The process requires a high degree of craftsmanship, but in the right hands, letterpress excels at fine typography. It is used by numerous small presses that produce fine handmade limited-edition books as well as artists’ books. TOP  Flexography   Flexography (also referred to as surface printing ), often abbreviated to flexo, is a method of printing an estimated all commonly used on behalf of packaging. A flexo print is achieved by creating a mirrored master of the required image as a 3D relief in a rubber or polymer material. A measured amount of ink is deposited upon the surface of the printing plate (or printing cylinder) using an anilox roll. The print surface then rotates, contacting the print material which transfers the ink. Flexo is so named because of the fact that it was originally used as a method of printing onto corrugated cardboard which has a very uneven surface. It is required that the printing plate surface maintain contact with the cardboard, which it does by being flexible. Also unprinted high points on the cardboard must not get printed by ink remnants not on the plate surface, which is achieved by ensuring a sufficient depth on behalf of the non-print areas of the plate. Originally flexo printing was very low quality. In the last few decades great advances have been made, including improvements to the plate material as well as the method of plate creation - usually photographic exposure followed by chemical etch, though also by direct laser engraving . Laser-etched anilox rolls also play a part in the improvement of print quality. Full colour picture printing now occurs, as well as some of the finer presses available today in combination with a skilled operator permit quality that rivals the lithographic process. Flexo has an advantage over lithography in that it can utilize a wider range of inks as well as is good at printing on a variety of different materials. Flexo inks, like those used in gravure as well as unlike those used in lithography generally have low viscosity. This enables faster drying as well as as a result, faster production. Typical products printed using flexography include brown cardboard boxes, flexible packaging, as well as wallpaper. A number of newspapers now eschew the more common offset lithography process in favour of flexo. TOP  Intaglio Printing   The intaglio printing process uses a metal plate that has had the image cut into the surface. The sunken image is filled with ink as well as the surface is wiped clean so only ink is left in the sunken image areas. It is a very specialized process that offers a document a very high quality look. Intaglio is an old printing process but is still used today as one of the best security features on valuable documents. References derived from Prakash Webtech Pvt. Ltd. http://cmge.immensepots.com/2008/08/30/types-of-printing-processes.html Sat, 30 Aug 2008 19:08:20 -0400 cmge