MGMT 1050 Lecture Notes - Lecture 7: Inkjet Printing, Toner, Corona Discharge
MGMT 1050 Tutorial 7 Notes – Inkjet Printers
Introduction
• As the paper rolls from the drum, it passes over a heat and pressure area known as the
fusing system.
• The fusing system melts the toner to the paper.
• The printed page then exits the printer.
• At the same time, the surface of the drum passes over another wire, called a corona
wire.
• This wire resets the charge on the drum, to ready it for the next page.
• Inkjet printers operate on a simple mechanism that also has the advantages of small size
and economy.
• Despite their simplicity, inkjet printers with high-quality inks are capable of
photographic quality color output.
• Mechanically, the inkjet printer consists of a print cartridge that moves across the page
to print a number of rows of dots, and mechanical rollers that move the page downward
to print successive rows.
• The inkjet print cartridge contains a reservoir of ink and a column of tiny nozzles, so that
several rows can be printed at once.
• Each nozzle is smaller than the width of a human hair.
• A dot is produced by heating the ink behind a nozzle.
• When the ink is boiled it sprays a tiny droplet of ink toward the paper.
• The volume of each droplet is about one-millionth the volume of the drop from an
eyedropper of water!
• Some printers use a vibrating piezo-crystal instead of heat to produce the ink droplets.
• Multiple reservoirs of ink make it possible to print multiple colors.
• For the highest quality color images, more specialized methods are required.
• The surface of the drum passes over another wire, called a corona wire.
• This wire resets the charge on the drum, to ready it for the next page.
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