Wednesday, February 4, 2009

Toner

Toner is a powder used in laser printers and photocopiers which forms the text and images on the printed paper. In its early form it was simply carbon powder. In order to improve the quality of the printout the individual carbon particles were blended in a polymer. The polymer particles can be melted by the heat of the fuser, causing it to bind to the fibers in the paper.In a copier, the toner stored inside a cartridge is stuck on larger, positively charged beads. As toner-coated beads are made to roll over the drum, the toner particles are more attracted by the positively charged ions on the unexposed areas on the drum's surface than the weakly charged beads. Later, the same particles are attracted even more towards the electro-statically charged paper. The plastic in the toner lets the user keep it from jumping ship once he/she has finally got it on the paper.In order to perform these tasks, quartz tube lamps and Teflon-coated rollers are required. First, the sheet of paper is sent between two of the rollers. Following it, the rollers are gently pressed down on the page to embed the toner in the paper fiber.
In the meantime, the lamps are on inside the rollers, producing sufficient heat to melt the toner. The toner, however, does not melt onto the rollers. How? The Teflon coating on the rollers prevents the toner and paper from sticking to them. The Price of toner is about US$10/kg but if you want the best the price is US$50.

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