What is the main purpose of the fusing step in the electrophotographic printing process?

The main purpose of the fusing step in the electrophotographic printing process is to bond the toner to the paper. During this stage, heat and pressure are applied to the printed paper, causing the toner particles to melt and adhere permanently to the paper fibers. This ensures a durable and high-quality print that remains intact even after handling or exposure to moisture.

In contrast, the other steps in the process serve different functions. Cleaning the imaging drum is essential for preparing the drum for the next print cycle, removing any residual toner or contaminants from previous prints. Charging the paper is not a step in the electrophotographic printing process; rather, it is the drum that gets charged to attract toner. Finally, applying toner to the drum happens before the fusing step, as toner is transferred from the drum to the paper during the image transfer phase, not fused onto it. Thus, the fusing step's critical role is in securing the toner to the substrate.