Put the pen tip into the ink and squeeze the capsule. If you want to fill as much ink as possible, after the first ink absorption, you can let the pen tip face up, let the air bubble lean against the pen tip as much as possible, then press the capsule to let the gas out, then immerse the pen tip in the ink (so that the capillaries of the pen tongue are also immersed in the ink) and then let go of the capsule to absorb ink. Repeatedly, you can absorb as much ink as possible, and the bubbles are smaller.

Because the ink absorption principle is that the elasticity of the capsule will return to its original state after being pressed, resulting in negative pressure in the tube, and the ink flows into the tube at atmospheric pressure, but the elasticity of the capsule is also affected by the air pressure. When the elasticity, the pressure of the ink height in the tube and the air pressure are balanced, the capsule will not return to its original state of 65,438+000%. Once the pen leaves the ink and is put down, the pressure of the ink column will be reduced and the capsule will continue to recover. At this time, air will also be sucked in, causing bubbles to appear. Therefore, only by vacuumizing the pen tube and then putting the whole pen tube into the ink can the ink be completely filled without leaving bubbles.

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