Patent ID: 7996970
Filing Date: 2011-08-16
Classification: A47C,B29C,B29L,Y10T

Abstract:
1. A method of manufacturing a seat comprising a seat frame, a cushion body disposed on the seat frame, and a cover covering the cushion body, the method comprising: a cushion body forming step of forming the cushion body; and an assembling step of attaching the cushion body and the cover on the seat frame, wherein in the cushion body forming step, the cushion body is formed by forming a sheet-shaped fibrous structure such that adhesion spots where thermally adhesive composite short fibers are caused to thermally adhere to one another in a state in which the thermally adhesive composite short fibers have crossed one another and adhesion spots where inelastic crimped short fibers having a melting point higher than that of the thermally adhesive composite short fibers and the thermally adhesive composite short fibers are caused to thermally adhere to one another in a state in which the inelastic crimped short fibers and the thermally adhesive composite short fibers have crossed each other are dispersed and distributed and a relationship of A≧3B/2 is satisfied when the number of short fibers arranged along in a thickness direction is represented as A and the number of short fibers arranged along a direction perpendicular to the thickness direction is represented as B regarding unit volume, and then cutting the sheet-shaped fibrous structure into plural pieces having predetermined shapes; disposing the plurality of sheet-shaped fibrous structures in a mold having a cavity with a predetermined shape and formed with steam holes in a state in which the plurality of sheet-shaped fibrous structures are stacked and compressed in a thickness direction; and blowing steam to the mold at an air pressure higher than atmospheric pressure; wherein the seat manufactured by said method comprises a seat frame, a cushion body, and a cover covering the cushion body, wherein the cushion body comprises a sheet-shaped fibrous structure which satisfies a relationship of A≧3B/2 when the number of short fibers arranged along in a thickness direction is represented as A and the number of short fibers arranged along a direction perpendicular to the thickness direction is represented as B regarding unit volume.