Inkjet head, manufacturing method thereof and method of forming water repellent film

摘要

An inkjet head which is provided with a nozzle plate that is covered with a water repellent film including a Ni-PTFE film, and a plurality of nozzles that are formed through the nozzle plate to eject ink. In this structure, the nozzle plate is subjected to a heat treatment after the Ni-PTFE film is formed on the nozzle plate, and then is subjected to water cooling. The water cooling is performed using cooling water having a temperature ranging from 15° C. through 30° C. after the heat treatment is finished.