SPRAYING METHOD, SPRAYING DEVICE, AND DETERMINATION METHOD OF SPRAYING CONDITION

PROBLEM TO BE SOLVED: To provide a spraying method capable of minimizing the fluctuation spraying thickness and providing a smooth finish surface with uniform thickness in a spray using a mechanical spraying robot. SOLUTION: In this spraying method by use of a mechanical spraying device, a spray is performed so that the central track of a spray nozzle projected to a spraying wall surface draws substantially a circular or elliptic spiral route by moving the spray nozzle along the spray advancing direction while rotating. The ratio AB/AC of the distance AB on the spray advancing directional center line from a start point A on the center line of a circular arc drawn therefrom to a point B on the center line CL to the distance AC on the center line from this point of a circular arc drawn therefrom in the opposite direction to the spray advancing direction to a point C on the center line CL satisfies the relation of AB/AC>=2.5.