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A second role played by the cap is to keep the environment around the nib well circumscribed, with the pen closed, so that the ink present on it does not dry out (causing a difficulty in restarting) on the one hand but does not even undergo pressure changes that can cause ink to escape. For this reason, there are both ventilated caps (with the presence of ventilation holes) and caps that are completely sealed. In particular, at the beginning of the 1900s, in order to guarantee against the loss of ink, the presence of a second [[inner cap]] began to be introduced as a constitutive part of many caps (significant patents {{Cite patent|US|764227}} and {{Cite patent|US|1028382}}), which encloses the part on which the section is bent and isolates it from the rest of the cap, guaranteeing the seal of the ink. Sometimes this same element is also used as a locking component in the assembly of the [[clip]], which can be mounted in a ring on the same, or wedged between the cap and [[inner cap]] by means of a lateral slot.

A second role played by the cap is to keep the environment around the nib well circumscribed, with the pen closed, so that the ink present on it does not dry out (causing a difficulty in restarting) on the one hand but does not even undergo pressure changes that can cause ink to escape. For this reason, there are both ventilated caps (with the presence of ventilation holes) and caps that are completely sealed. In particular, at the beginning of the 1900s, in order to guarantee against the loss of ink, the presence of a second [[inner cap]] began to be introduced as a constitutive part of many caps (significant patents {{Cite patent|US|764227}} and {{Cite patent|US|1028382}}), which encloses the part on which the section is bent and isolates it from the rest of the cap, guaranteeing the seal of the ink. Sometimes this same element is also used as a locking component in the assembly of the [[clip]], which can be mounted in a ring on the same, or wedged between the cap and [[inner cap]] by means of a lateral slot.

Il cappuccio inoltre costituisce spesso un elemento caratteristico per il design e le linee di una penna, e può essere oggetto delle più varie decorazioni. Fra queste un elemento comune, molto usato e tutt'oggi presente sulla gran parte dei cappucci, sono le [[verette]], o i vari anellini, il cui scopo originario era peraltro di natura strettamente pratica. Il bordo del cappuccio infatti è una delle parte più stressate e soggette a rischio di rottura di una penna, e l'uso originario (vedi brevetto {{Cite patent|US|662796}}) di [[verette]] e bande metalliche era appunto quello di rinforzare il suddetto bordo, e solo in un secondo tempo queste hanno assunto il carattere di elemento decorativo.

The cap is also often a characteristic element for the design and lines of a pen, and can be the subject of various decorations. Among these, a common element, widely used and still present on most of the caps, are the bands, or the various rings, whose original purpose was also strictly practical in nature. The edge of the cap is in fact one of the most stressed and subject to the risk of breaking a pen, and the original use of rings and metal bands (see patent {{Cite patent|US|662796}}) was precisely to reinforce the edge, and only later these have assumed the character of a decorative element.

{{Doppia immagine|right|Waterman-20-Black-Open.jpg|120|Swan-Pen-StraightCap-BCHR-GoldBand-Open.jpg|120|esempi di ''[[cone cap]]'' e ''[[straight cap]]''}}

{{Doppia immagine|right|Waterman-20-Black-Open.jpg|120|Swan-Pen-StraightCap-BCHR-GoldBand-Open.jpg|120|esempi di ''[[cone cap]]'' e ''[[straight cap]]''}}