Seat, method of manufacturing the same, and method of treatment for recovery from permanent set in fatigue of the seat

Abstract

To provide a seat having a three-dimensional complex undulated cushion body securing hardness in a stress direction and excelling in dispersibility of the stress and durability, and a method of manufacturing the same. A seatincludes frames (), cushion bodies () obtained by forming a plurality of sheet-like fibrous structurestointegrally, and covers (), wherein a sheet-like fibrous structureis formed by performing cotton blending of thermally adhesive composite short fibers to inelastic crimped short fibers and thermally adhering crossing points, and the sheet-like fibrous structuresatisfies a relationship of A≧3B/2 when the number of short fibers arranged along 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, and the cushion bodiesare obtained by disposing in a state in which the sheet-like fibrous structurestoare stacked and compressed in a mold, and forming the sheet-like fibrous structurestointegrally by performing high pressure steam molding, and provided on the framessuch that a thickness direction extends along a direction in which a load is applied.