1, the first step is to unscrew the pen and take out the used ink bag (be careful when pulling it out).

2. Step 2: Align the new ink bag with the interface and press it hard. If you can't press it, press it hard while turning slowly.

Step 3: Put it upside down in the pen container for about a minute, let the ink flow through the pen, and then you can write.

Extended data:

Ink sac, also known as ink sac, ink sac, etc. , mainly used to replace the matching pen core and ink core.

An ink bag is a tube filled with ink. You can use it by directly inserting the lid into a pen. It is disposable and usually contains a bead to prevent ink from overflowing. Although the effect is better, the cost performance is not particularly high. Please discard the ink in the ink bag after using it. In addition, similar products also have ink absorbers, which can be used repeatedly like ordinary pens.

References:

Baidu Encyclopedia: Ink Capsule