We all know that the hp toner charge determines the performance of the toner in the printed matter. We will discuss the one-component toner and the toner will not be attracted by the opc (organic photoconductor drum) of the region is the polarity of the charge is attracted to the electrostatic latent image area, which is the laser printing imaging principle, generally in the state of the toner powder, the toner charge distribution showed a broad trend, especially in the market some Cheap toner in the cost considerations did not do centralized screening, the situation will be more uneven charging, so a part of the reverse polarity of the toner in the unexposed area but was attracted to the past to form fogging.
What are the factors that affect Q / M (the amount of toner per unit mass)
1, the surface roughness of the developing roller (DR)
2, DR volume resistance;
3, DR surface resistance;
4, DR capacitance;
5, adjust the pressure of the scraper (DB);
6, toner charge control agent (CCA).

The pressure between the tn660 toner and the scraper allows the toner to press against each other and rub against the scraper. When the pressure is greater, the amount of static electricity is greater, but the excessive scraper pressure prevents the toner from rolling , And will squeeze the toner deformation, while the CCA into the toner, while the impact of the amount of toner, toner CCA somewhat similar to the SPACER, the toner particles separated control of the charged CCA but a loss of toner Electrical instability will occur, usually under the life test CCA and the relationship between the toner will change, resulting in print quality decline.

The development roller (DR) is the most critical component to determine the behavior of the toner. First, when the toner is driven by the supply roller (SR), the roughness of the DR determines the amount of toner, the roughness of the DR surface, Toner is sliding on the DR surface, DR surface roughness, toner is the "launch", and only the toner is rolling in the case of friction through the scraper, is the best charge. And what kind of roughness is the ideal DR surface roughness? This determines the mean value particle size of the toner, which is a fixed proportion according to the mechanical model. Therefore, a good DR must keep the roughness until the end of the print life. And the roughness will also determine the toner "effective print" area is in which area, the toner behavior is a very interesting discussion topic, so it is not a so-called good DR on the market all the toner Are applicable. The volume resistance of the DR will form a voltage drop on the surface of the DR. This voltage drop forms an electric field with the electrostatic charge on the OPC drum. This electric field drives the charged toner movement, so the correct DR volume resistance is related to the trend of toner movement , Which also affects the amount of toner consumption, the electrostatic latent image area of the electric field strength is stronger, the more the amount of toner to be attracted, the transfer rate is high, the waste rate is reduced. But the electric field strength is not the higher the better. If the large particles of toner to attract over will affect the thermal fixation, it must be stable in the design value. Of course, if the toner particle size distribution is narrower, the transfer rate will be higher.