Translations:Sistemi di caricamento/16/en

The idea of using a rubber sac as an ink tank helped to solve some of the problems encountered until then. In particular, since the ink was no longer in contact with the material of the pen barrel, it was also possible to use materials that were susceptible to corrosion. Moreover, if the rubber tank is well positioned and is not placed in contact with the walls of the drum, the layer of air that separates it from it acts as thermal insulation, and the elasticity of the bag compensates for the problem of increased pressure due to the heat transmitted by the hand that holds the pen.