Patent ID: 8003035

Claim:
A method of manufacturing a plugged honeycomb structure to manufacture a plugged honeycomb structure provided with a tubular honeycomb base material in which a plurality of cells is partitioned and formed by a porous partition wall and a plugging portion that is disposed at an open end of each cell, the method comprising a plugging process including the steps of: immersing one end (a first end) of the honeycomb base material in a plugging slurry while vibrating the plugging slurry; after the first end of the honeycomb base material is immersed, either continuing to vibrate the plugging slurry or halting the vibration of the plugging slurry; after bringing an internal part of the plurality of cells to a negative pressure and then returning the internal part of the plurality of cells to an atmospheric pressure, either continuing or resuming vibrating the plugging slurry to make the plugging slurry enter a first open end of each of one or more cells of the plurality of cells; and drying the plugging slurry having entered the first open end of each of the one or more cells to form a first plugging portion at the first end.