Sheet member, forming method of the same, exhaust gas treatmenet apparatus, and muffling apparatus
AssigneeIbiden Co., Ltd.
InventorTakahiko Okabe
Life of this patent
Estimating the term…
Abstract
A sheet member including inorganic fibers includes a first outer layer; a center layer; and a second outer layer. The first outer layer, the center layer, and the second outer layer are laminated with each other such that both the first and the second outer layers are outermost layers; the center layer includes inorganic fibers having diameters equal to or less than approximately 3 micrometers; and the first and the second outer layers include inorganic fibers having diameters greater than approximately 3 micrometers.
Claims22
A sheet member for an exhaust gas treatment apparatus including inorganic fibers, the sheet member comprising:
- first and second outer layers;
- and
- a center layer;
- wherein
- the first outer layer, the center layer, and the second outer layer are laminated with each other such that both the first and the second outer layers are outermost layers;
- the center layer includes needle traces, and inorganic fibers having a diameter less than 3 micrometers;
- the first and the second outer layers include inorganic fibers having a diameter greater than approximately 3 micrometers;
- and
- the sheet member further includes a covering layer provided so as to cover at least a side face of the center layer, said side face facing an inlet of the exhaust gas treatment apparatus, said covering layer directly contacting the side face of the center laver and being arranged to be perpendicular to the center layer,
- wherein the sheet member is provided around at least a part of the exhaust gas treatment apparatus.
A method of forming a sheet member for an exhaust gas treatment apparatus including inorganic fibers, the method comprising:
- a step of forming a first outer layer including inorganic fibers having a minimum diameter greater than approximately 3 micrometers;
- a step of forming a center layer including needle traces, and inorganic fibers having a diameter less than 3 micrometers;
- a step of forming a second outer layer including inorganic fibers having a minimum diameter greater than approximately 3 micrometers;
- a step of laminating and joining the first outer layer, the center layer, and the second outer layer such that both the first and the second outer layers are outermost layers;
- and
- a step of forming a covering layer provided so as to cover at least a side face of the center layer, said side faces facing inlet and outlet of the exhaust gas treatment apparatus, said covering layer directly contacting the side face of the center layer and being arranged to be perpendicular to the center layer,
- wherein the sheet member is provided around at least a part of the exhaust gas treatment apparatus.
Dependencies are inferred from the claim text.