Patent ID: 8632852

Claim:
A method of producing a honeycomb filter comprising: providing an apparatus including a workpiece securing section for securing a base of a honeycomb filter, a powder transfer section disposed on one side of the workpiece securing section for transferring a powder together with a pressurized gas, an introduction section provided between the powder transfer section and the workpiece securing section, wherein the powder transferred from the powder transfer section together with the pressurized gas is mixed with air in the introduction section and introduced into the base secured by the workpiece securing section when the apparatus is used, and a suction section disposed on the other side of the workpiece securing section for sucking the gas that has passed through the base secured by the workpiece securing section by reducing pressure on the other side of the workpiece securing section as compared with the one side of the workpiece securing section using suction means; and coating powder on an inner surface of the base of the honeycomb filter using the apparatus while adjusting a flow rate, A, of a gas, a, that is sucked by the suction section, a flow rate, B, of a gas, b, ejected from the powder transfer section, and a flow rate, C, of a gas, c, that is mixed with the gas b in the introduction section so that the relationships “A=B+C” and “C>0” are satisfied.