How to choose and identify the quality of toner?

How to choose and identify the quality of toner?

author: Uvink

2023-03-14

The calculation of the blackness value is that the blackness value tester first emits a certain

amount of strong light beams, hits the pattern to be tested, and then reflects back to

the blackness value tester, calculates the absorbed light beams, and then obtains through

a fixed calculation program value. Laser printers are mainly designed for office use,

so their OEM average blackness value is generally around 1.48. In China, some types of

printers are used to produce printing media such as film or sulfuric acid paper. The fibers of

these printing media have undergone special chemical treatment. Compared with ordinary

printing paper, the resin in the toner is more difficult to melt and penetrate. into the paper fiber,

so the requirements for toner are relatively high.

The bottom gray value is the blackness value of the blank space without words in the printed

sample with a blackness tester. It is also related to the whiteness of the printing paper, that is,

the bottom gray value of the same toner on different printing papers is not necessarily the same.

Under normal circumstances, the bottom ash value of OEM toner is about 0.05~0.06.

When it is greater than 0.06, the result of visual inspection will feel that the printed proof is

a bit dirty. The bottom ash value of the toner provided by our company is similar to that of OEM,

about 0.05~0.06. The reason affecting the bottom ash value is mainly related to the conductive

properties of carbon powder and the particle size of carbon powder. The stronger

the conductivity and the finer the particles, the easier it is to generate bottom ash. Each type of

printer requires different electrical properties of toner, which is one of the reasons why

we emphasize special toner. In addition, the leakage caused by the damage of the photosensitive

layer on the surface of the photosensitive drum will also cause bottom dust, which can also

explain that when the photosensitive layer is worn, the printed page will have obvious

black marks on the damaged part.

Waste toner rate refers to the proportion of waste toner produced by a certain amount of toner

in normal printing. During the production of carbon powder, various ingredients are added together

in a certain proportion, fully stirred, and then ground after corresponding treatment. In this process,

there is no guarantee that the thickness of each toner particle and the proportion of its main

ingredients toner, iron powder, and resin are the same, and it can only be within a certain range.

Beyond this range, the toner particles may become waste powder. When the waste powder rate of

toner is between 5% and 7%, it is within the normal range. The waste toner rate also directly

affects the number of pages printed with a certain amount of toner.