Knowledge quiz：Why has the cartridge run out of ink?

Working for a long time, always use the printer

Have you noticed that,

It happens a lot at work,

The printer says inside

The ink has run out.

But when we opened the cartridge,

And found that there was still

some ink in the cartridge,

Why is this？？？

Let Xiaobian come now

Let's"reveal the secrets"

When the cartridge runs out of ink

There's still some left over,

There are three reasons why

Printing needs

There must be a certain amount of ink in the cartridge so that the printer can use the ink when printing.

When the ink allowance is low, the printed document may appear light in color to ensure that the document can be printed completely.

When the amount of ink in the cartridge is insufficient to complete the next print, the printer may prompt you to replace the cartridge.

（http://www.obooc.com/index.htm）

Structure of the cartridge

Ink can not be completely discharged and the structure of the cartridge also has a certain relationship, most cartridges have a sponge for adsorption of ink, when most ink is discharged, there will be a small amount of ink residue.

When the cartridge is in a depleted state, it is difficult to squeeze out all the remaining ink in the cartridge like squeezing out toothpaste, so the ink in the cartridge cannot be completely used up.

Three color cartridges are used at different rates

In addition, when replacing a three-color cartridge, there will be some ink left because the ink of all colors may not be used at the same rate.