Beyond safety, this hole plays a very real role in the proper functioning of the Ā pen. When writing, the pressure inside the cap must remain balanced for the Ā ink to flow smoothly.
Without this small opening, air doesnāt circulate properly. As a result, the ink can bleed, dry too quickly, or stop flowing altogether. The hole acts as an invisible regulator, ensuring a smooth and consistent line. Like a small, discreet, but essential valve.
And as a bonus: by promoting this good balance, it also helps to extend the penās lifespan. Practical, isnāt it?
A clever move for manufacturers
Itās not always obvious, but Ā designing hundreds of millions of bottle caps represents a considerable industrial cost. Every gram of plastic saved counts.
Thanks to this small opening, manufacturers use less material, speed up the molding process, and reduce production costs. Good design is also about this: thinking about the user AND the production line. Efficient at every level.
When technique becomes signature
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Some Ā brands have gone even further. BIC, for example, has made this hole a true identifying feature. It is now part of the productās aesthetic, instantly recognizable.
This proves that a purely technical detail can, over Ā time, become a visual signature. A bit like those little everyday things that end up defining a cult object.
What if all caps have this hole? Not quite ā some models still donāt. But major brands adhere to this standard, and thatās a good thing.
The next time you pick up your favorite Ā pen, youāll look at that little hole with completely different eyes.
