Ngk Insulators, Inc.

Narumi China Corporation

Koichi Ito

Takeshi Tokunaga

Yukihito Ichikawa

Katsushi Sugita

Plugged honeycomb structure

A method of manufacturing a plugged honeycomb structure has a plugging process which includes the steps of: immersing one end (a first end) of a honeycomb base material in a plugging slurry while vibrating the plugging slurry; after bringing an internal part of a cell into a negative pressure and then returning it into an atmospheric pressure, vibrating the plugging slurry to make the plugging slurry enter a first open end of the cell; and drying the plugging slurry having entered the first open end of the cell to form a first plugging portion at the first end.

Method of manufacturing plugged honeycomb structure

A manufacturing method of a plugged honeycomb structure including attaching a transparent sheet to an end face of a honeycomb structure; picking up an image of the end face; with respect to cells positioned at other than outermost peripheral portion of a honeycomb structure (usual cells), subjecting the picked-up image to image processing, recognizing positions to be plugged on said sheet, and with respect to cells positioned at outermost peripheral portion (outermost peripheral cells), positions of the cells are recognized based on an average cell pitch calculated from the positions of the cells, subjecting to a perforation treatment based on the recognized positions of the sheet, submerging an end portion into a plugging slurry in which a material of the plugging portions is slurried, filling holes made at the respective sheet with the slurry to form the plugging portions.

Manufacturing method of plugged honeycomb structure

There is provided a honeycomb structure including: porous partition walls separating and forming a plurality of cells extending between two end faces, and an outer peripheral wall formed unitarily with the partition walls. The cells include outermost peripheral portion partial cells each locating in an outermost peripheral portion of the honeycomb structure and having an incomplete cell cross section, a part of which is brought into contact with the outer peripheral wall, and complete cells each having a complete cell cross section other than the outermost peripheral portion partial cells. The complete cells and the outermost peripheral portion partial cells having plugging portions formed on one end portion so that an entire end face of the honeycomb structure shows a checkerwise plugging pattern, and the depth of the plugging portions in the outermost peripheral partial cells is smaller than that of the plugging portions in the complete cells.

A method is provided for manufacturing a plugged honeycomb structureincluding a honeycomb substrateand plugging portionsarranged so as to form complementary checkered patterns at both end surfacesandof the honeycomb substrate. The method includes attaching a first mask filmto the first end surfaceof the honeycomb substrate, making slurry permeation holesto introduce a plugging slurry, attaching a second mask filmto the second end surfaceof the honeycomb substrate, making slurry permeation holes, allowing air to flow into the cellsso as to discharge air giving a pressure of 0.05 to 5 MPa between the first mask filmand the honeycomb substrate; and filling cell opening end portionswith the plugging slurryto fire the resultant slurry filled substrate

A manufacturing method of a plugged honeycomb structurewhich comprises a honeycomb substrateand plugging portionsarranged so as to form complementary checkered patterns alternately at both end surfacesandof the honeycomb substrate. The method comprises attaching mask filmsandto both end surfacesandof the honeycomb substrate, respectively; forming slurry permeation holesat portions of the mask filmsandcorresponding to cell opening end portions, respectively; forming deaeration holesat portions of the mask filmsandfacing the portions provided with the slurry permeation holesvia cells; submerging both end surfacesandof the honeycomb substrateto which the mask filmsandhave been attached into a plugging slurry, respectively; and firing the resultant slurry filled substrate

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Nagoya, Japan

Koichi Ito