Holding sealer, exhaust gas processing device and manufacturing method of the same

An exhaust gas processing device comprising:

• an exhaust gas processing body,
• a holding sealer for winding around the exhaust gas body, the holding sealer comprising:
• a holding sealer material including mutually intertwined inorganic fibers, said holding sealer material having a first surface such that when the holding sealer material is wound around at least a portion of an outer surface of said exhaust gas processing body, said first surface faces outside;
• a plurality of needling traces where said mutually intertwined inorganic fibers are oriented along a direction of thickness of the holding and sealer material due to a needling process;
• a first plurality of parallel ditch-shaped structures formed on said first surface;
• a second plurality of parallel ditch-shaped structures formed on said first surface in a direction substantially perpendicular to the first plurality of parallel ditch shaped structures, wherein said first and second plurality of parallel ditch-shaped structures are each constructed by slit lines which extend in a diagonal direction relative to a winding direction of the holding sealer material, each ditch shaped structure of the first plurality of parallel ditch-shaped structures is arranged such that the first plurality of parallel ditch-shaped structures has a pitch ranging from 0.5 to 5 per cm, and each ditch shaped structure of the second plurality of parallel ditch-shaped structures is arranged such that the second plurality of parallel ditch-shaped structures has a pitch ranging from 0.5 to 5 per cm so as to retain a stress dispersion capacity;
• and
• a casing which houses said exhaust gas processing body and said holding sealer material therein.

A manufacturing method of an exhaust gas processing device, said manufacturing method comprising:

• providing a holding sealer having mutually intertwined inorganic fibers, a plurality of needling traces where said mutually intertwined inorganic fibers are oriented along a direction of thickness of the holding and sealer material due to a needling process, a first plurality of parallel ditch-shaped structures on a first surface and a second plurality of parallel ditch-shaped structures formed on said first surface in a direction substantially perpendicular to the first plurality of ditch shaped structures, wherein said first and second plurality of ditch-shaped structures are each constructed by slit lines which extend in a diagonal direction relative to the length and width edges of the holding sealer material, each ditch shaped structure of the first plurality of parallel ditch-shaped structures is arranged such that the first plurality of parallel ditch-shaped structures has a pitch ranging from 0.5 to 5 per cm, and each ditch shaped structure of the second plurality of parallel ditch-shaped structures is arranged such that the second plurality of parallel ditch-shaped structures has a pitch ranging from 0.5 to 5 per cm so as to retain a stress dispersion capacity,
• winding said holding sealer around at least a portion of an outer surface of an exhaust gas processing body such that said first surface faces outside, and
• housing said exhaust gas processing body, around which said holding sealer is wound in said casing by any of a press-fit means, a clamshell means, a winding and tightening means or a sizing means.

A holding sealer for winding around an exhaust gas processing body of an exhaust gas processing device, said holding sealer comprising:

• a holding sealer material including mutually intertwined inorganic fibers, said holding sealer material having a first surface and a second surface opposing the first surface, and having a predetermined shape with a length edge extending in a winding direction and a width edge extending from the length edge;
• a plurality of needling traces where said mutually intertwined inorganic fibers are oriented along a direction of thickness of the holding sealer material due to a needling process;
• and
• a plurality of parallel ditch shaped structures formed on said first surface and constructed by slit lines having a pitch ranging from 0.5 to 5 per cm, each of said plurality of parallel ditch shaped structures extending in a width direction of the holding sealer material, and being in a zigzag shape.