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Fuser Unit

Fuser Units are components laser printers and laser based photocopiers.

The purpose of the fuser is to permanently bond toner to paper medium by applying heat and pressure.  The laser printer fuser unit is made up of two rollers, one applies heat and the other applies pressure.

The heat roller is a hollow (usually metal) tube that is heated by a radiant suspended in its centre allowing the roller tube to heat evenly.  The pressure roller is a backing roller made of rubber.  Temperatures in fuser units can reach over 200°C.

When heat and pressure is applied the toner melts and adheres to the paper and is permanently sealed.

This is why the paper exiting from a laser printer is warm.

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