Patent ID: 6893181

Claim:
A method of treating a coherent high porosity, elongate element designed to form a nib, the method comprising the steps of: from an elongate element which is a rod constituted by fibers that have previously been held together by a binder, continuously impregnating said elongate element with a sealing bath having a sealing agent that is inert relative to the components of the ink, impregnation being performed under conditions of viscosity, of time, of surface tensions, and of concentration in particular, such that said bath diffuses into the elongate element and fills the pores or capillaries of the rod over a limited thickness of its longitudinal periphery, said limited thickness ranging from about 0.01 mm to about 1 mm; and setting the sealing agent in such a manner that the pores or capillaries are plugged and a substantially airtight barrier is created preventing the ink solvent from evaporating or limiting evaporation thereof.