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Digital printing technology involves use of ink in various ways. The inkjet printing technology is the most commonly used technology. It may use a nozzle or a valve to control the amount of ink being released. The different ways which are employed to drop ink are drop on demand and continuous jet. The continuous jet type of method uses single jet or multiple jets for releasing ink and the drop on demand method involves ways such as Valve jet method, piezo-electric method, bubble jet and hot melt methods.
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The continuous jet method uses a nozzle. The nozzle provides ink for printing. The amount of ink being released is controlled by electrostatic charge, when ink droplets leave the mouth of the nozzle. This technology happens to be the oldest among all.
In the bubble jet technique of providing ink, digital data causes a resistive heat element to heat up the nozzle containing the ink. The ink boils because of this heat and the causes only a specific amount of ink to come out of the nozzle in form of a bubble, which is required to print that data stream. This type of printer is also termed as a thermal inkjet printer. This printer is considered to be slower compared to other printers.
Piezo electric type of digital printing is considered to be the easiest methods of all. As the name suggests the piezo electric effect produces signals and these signals are received by the crystals of Lead Zirconium Titanates. These crystals in turn expand and apply pressure on the ink. The ink is projected out as and when the signals are received. This method has many advantages over thermal printing as it does not depend on heat. It is more reliable and is extremely useful for printing pages in large numbers. The resolution is also better than the other methods of printing.
There are many advantages of digital printing. Conventional printing is more time consuming especially if high volumes of pages are to be printed. In the case of a printing presses the conventional printing requires the pages to be dried before they can be cut and stapled to form books. On the other hand, in case of digital printing the pages are ready to be made into booklets as soon as they come out from the printer. The materials used in conventional printing are more and it entails more waste compared to digital printing. Using a digital printer saves time as well as manpower. There are ecological benefits also as the number of print runs are dramatically reduced.
Article Source: http://EzineArticles.com/4493716
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