Patent ID: 7968142

Claim:
A method of coloring an electric wire comprising the step of: spouting a liquid coloring agent including a coloring material and a solvent, by ejecting the liquid coloring agent in liquid drop form, toward an outer surface of the electric wire with a specific amount thereof at a time so as to allow a liquid drop of the coloring agent to adhere to the outer surface of the electric wire so as to form a plurality of spots arranged in a longitudinal direction of the electric wire, and provide a predetermined distance between centers of spots situated adjacently to each other, whereby said coloring agent is previously heated up to a range lower than a boiling point of the solvent, and then spouted to the outer surface of the electric wire, wherein a receiver for receiving the coloring agent therein is heated for heating the coloring agent to a range lower than the boiling point of the solvent, wherein temperature of the coloring agent is monitored by a temperature sensor, and maintained in a liquid state, wherein the liquid coloring agent is passed from the receiver to a first nozzle and then to a coaxial second nozzle, while being pressurized, and spouted from the second nozzle toward the outer surface of the electric wire, and wherein a coloring agent supply source and the coloring nozzles are respectively independently heated.