Inkjet head, method for producing inkjet head, inkjet recorder and inkjet coater

A method for producing an inkjet head for jetting an ink from a nozzle that is formed on a nozzle main body formed of a metal material, the method comprising:

• smoothening a surface of the nozzle main body;
• applying a silica sol solution to the nozzle main body so as to form a silica sol film, wherein the silica sol solution has a concentration that is controlled to avoid a nozzle clogging in the nozzle main body;
• heating the silica sol film formed on the nozzle main body to thereby convert the silica sol film into an SiO2 film;
• applying an ink repellent agent solution to the SiO2 film and drying to thereby form an ink repellent film, wherein the ink repellent agent solution is prepared by dissolving a compound having an alkoxysilane residue at an end of a perfluoro polyether chain in a solvent;
• and
• removing an ink repellent film formed on a side to be in contact with an ink channel of the nozzle main body while remaining at least an ink repellent film formed on a surface of an ink jetting side of the nozzle main body.