Web Offset Printing

What is Web Offset Printing?

Web offset printing is a form of printing in which a continuous roll of paper is fed through the printing press. It is used for printing mass-market books, magazines, newspapers, brochures and catalogues. The pages are to size and separated after they have been printed. Offset printing is a technique in which the ink is transferred from a plate to a rubber blanket, and then to the printing surface. The offset technique employs a flat image carrier on which the image to be printed obtains the ink from the ink rollers, while the non-printing area attracts a water based film keeping the non printing areas ink free.
Offset printing is one of the best ways to produce the different print products in numerous quantities while maintaining the quality of each piece from start to finish. Not to mention, this printing type is reliable, fast and affordable! For owners of small businesses and alike, offset printing is the ideal process to print your promotional materials.

Identification

All print technology has its on identification. In text for Offset Printing it is sharp and the edges are clear and easily readable. The paper around the ink dots is ually unprinted. The halftone dots are always irregular and blurry, but there are different screening methods.

What Use Is Offset Printing Today?

It is one of the most common uses to creat printed matter. It has been used to make news papers, magazines, brochurse
and other types of reading matterials that we still use today.


What makes Web Offset Printing relevant today?

Compared to other printing methods, web offset printing is best suited with effective cost for producing large volumes of high quality prints in a manner that requires little maintenance. Campaign Advocates, Priniting companies, and Medium to large scale businesses use offset printing today. Campaign advocates use offset printing during election seasons and for recruitment and business openings. Printing companies use it for printing large quality orders, and Medium to Large scale businesses use it for advertising and with a low budget they can make bulk prints in excellent quality.

Advantages

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  • Consists of high image quality,
  • Produces sharp and clean images,
  • Types more easily then letterpress printing,
  • Quick and easy production,
  • The cheapest method of high quality printing.

Disadvantages


  • slightly inferior image quality compared to rotogravure or photogravure printing
  • time and costs associated with producing plates and printing press setup therefore the quantity of printing jobs are now moving to digital offset machines.


Steps For Preparation

  1. The ink duct roller delivers ink from the ink duct to the ink pyramid "Ink Train"
  2. The ductor roller "Vibrator Roller" due to its rapid back and forth motion transfers in from the duct roller to the first roller.Never in contact with both rollers at the same time.
  3. The distribution rollers evenly distribute ink. The first roller picks up the ink from the driving rollers, then the last roller transfers the ink to the form rollers
  4. The transfer rollers transfer ink between the ink-absorbing and ink-delivering driving rollers.
  5. Driving rollers roll against the distribution rollers and either absorb of deliver ink, depending on the placement.
  6. Ink form rollers transfer ink from the last distribution rollers to the printing plate.
  7. The printing plate transfers the ink to the offset cylinder "blanket cylinder" usually covered with a rubber 'blanket'.
  8. The paper is then pressed against the blanket cylinder by the impression cylinder, transferring the ink onto the paper to form printed image.

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http://en.wikipedia.org/wiki/Offset_printing