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Laser Printing & Offset Printing

LASER PRINTING

Laser printer is a common printer, able to print data in paper quickly and in large quantities. It performs a xerographic printing process, when a document is sent to the printer, a laser beam "draws" the document on a selenium-coated drum using electrical charges.

How it works

  

Laser printing is one of the indirect static electricity printer.

The most important part of a laser printer is the photoreceptor drum coated with selenium compound which is sensitive to the light and has very high resistance in the dark and works as a capacitor. 

After the drum is charged, it is rolled in toner, a dry powder type of ink. The toner adheres to the charged image on the drum. The toner is transferred onto a piece of paper and fused to the paper with heat and pressure.

 

OFFSET PRINTING

Offset printing 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 paper. A plate is made up of areas that are receptive to grease and areas that are receptive to water. The areas receptive to grease hold onto the ink while the other areas attract water and repel the ink.

The advantages of this method:

  

High and consistent image quality.

The flexible rubber conforms readily to the print media surface, allowing the process to be used effectively on rough-surfaced media such as canvas, cloth or wood.

All this happens really fast and many impressions can be made from one set of plates. It is a very efficient process and lends itself very well to long runs over a long period of time.

Offset printing now became the most common printing technology in commerce printing. Color printing creates colorful images and characters contrast to black-and-white printing. The common method is offset printing used four color known as CMYK, or six color method.