Green honeycomb molding defect examination method, green honeycomb structure manufacturing method, and green honeycomb molding defect examination device

A device for examining defects in a green honeycomb molding having partition walls which form a plurality of flow channels extending in parallel with one another, and sealing portions which close one end of some of the plurality of flow channels and the other end of the rest of the plurality of flow channels, the device comprising:

• a pressure application member which applies pressure to one end of the plurality of flow channels using gas supplied from a gas supply source;
• a first visualization unit which acquires a plurality of first direction images visualizing the distribution of refractive indexes of gas near the other end of the plurality of flow channels from a first direction intersecting the axis of the plurality of flow channels at different times;
• a second visualization unit which acquires a plurality of second direction images visualizing the distribution of refractive indexes of gas near the other end of the plurality of flow channels from a second direction intersecting the axis of the plurality of flow channels and intersecting the first direction at different times;
• a first selection unit which selects an image having a largest number of jet flows of gas discharged from the other end of the plurality of flow channels of the green honeycomb molding in the plurality of first direction images;
• a second selection unit which selects an image having a largest number of jet flows of gas discharged from the other end of the plurality of flow channels of the green honeycomb molding in the plurality of second direction images;
• and
• a position acquisition unit which acquires information relating to the positions of the jet flows in the selected two images.