Methods of plugging honeycomb bodies

A method of plugging a honeycomb body, comprising the steps of:

• applying a mask layer to the honeycomb body comprising a plurality of channels;
• forming a plurality of holes in the mask layer such that the plurality of holes are aligned with the plurality of channels;
• positioning a nozzle defining a slot die opening proximate the mask layer to form a gap between the mask layer and the slot die opening of from about 0.1 mm to about 2 mm;
• moving the honeycomb body relative to the nozzle;
• and
• passing a plugging cement through the slot die opening defined by the nozzle against the mask layer such that the plugging cement passes through the plurality of holes of the mask layer and enters the plurality of channels of the honeycomb body.

A method of plugging a honeycomb body, comprising the steps of:

• applying a mask layer to the honeycomb body comprising a plurality of channels;
• forming a plurality of holes in the mask layer such that the holes are aligned with the plurality of channels;
• positioning a nozzle defining a slot die opening proximate the mask layer to form a gap of from about 0.1 mm to about 2 mm between the mask layer and the slot die opening, wherein the nozzle has an angle of from about 0° to about 20° relative to the mask layer and the slot die opening extends across a majority of a maximum width of the mask layer;
• moving the honeycomb body relative to the nozzle;
• and
• passing a plugging cement through the slot die opening defined by the nozzle against the mask layer such that the plugging cement passes through the plurality of holes in the mask layer and enters the plurality of channels of the honeycomb body.