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    Purpose

    "Fixing unit (one of the core components) for copiers and laser printers. The process of printing the toner image adsorbed on the paper, using the method of pressure and heat fusion, so that the melted toner is immersed in the printing paper to form a fixed image, is called ""fixing"".

    The carbon powder adsorbed on the paper is a small particle mixed with thermal resin and carbon powder. When a metal roller with a high and small gap is between the gaps, the resin in the toner melts and is tightly pressed onto the paper together with the toner to form a permanent image, and at the same time complete the entire laser printing process. The melting temperature of the toner is about 100°C, and the temperature of the heat roller is related to the speed of paper passing, generally between 150 and 180°C. After cleaning the residual powder and light, the photosensitive drum enters the next cycle. The laser printer adopts the method of composite hot pressing, and uses the "fixing component" to complete the fixing. The working process of toner image fixing is as follows:

    When the printing paper with ""toner image"" enters the fixing device from the paper guide When the heating roller is between the heating roller and the pressure rubber roller, the heating roller is heated by the heating lamp (185°C), and the pressure of the pressure rubber roller causes the toner to melt and immerse into the printing paper. The surface of the heating roller is coated with a polytetrafluoroethylene coating, which is not easy to adhere to the toner. Some models also have a layer of Teflon film on the surface of the pressure rubber roller, which helps the toner on the back side to not stick during double-sided printing. After heating and fixing, the printing paper is separated from the heating roller by the separating claw, and is led out by the paper discharge wheel to complete the whole fixing process.