Do pens need caps?

The pen caps protect and prevent the tip from being exposed to the atmosphere so that the ink does not dry out. The pen caps have a small hole to prevent them from drowning if swallowed and to equalize the pressure inside the pen and prevent it from dripping. When you cover the tip of a pen with a pen cap and it's tight, a kind of vacuum is created inside the cap, so it can be very difficult to open it. In addition, the hole in the pen caps serves to stop air in the pen due to temperature variations through pressure cycles.

The pen caps work as seals for the tip of the pen where the ink is exposed to air. Sealing the pen with the cap will prevent the ink from drying out from the tip of the pen (which is the tip).

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