Fuser Unit - What is a fuser unit?

Answer:

A component found in electrostatic printers, laser printers, and xerographic printers and photocopiers. The fuser unit is used to permanently bond toner to a substrate by applying heat and pressure. A fuser unit is made up of two rollers; one to apply heat and one to apply pressure. The heat roller is a hollow (usually metal) tube that is heated by a radiant heat lamp suspended in its centre (so the tube is heated uniformly), while the pressure roller is a backing roller made of rubber. Temperatures in fuser units can reach over 200°C.