Patent ID: 7120975
Filing Date: 2006-10-17
Classification: D04H,F16D

Abstract:
1. A method of making a helical two-dimensional fiber sheet, the method comprising the following steps: bringing at least one transverse fiber sheet and lapping it while guiding it in a substantially radial direction along a path in alternating directions between inner and outer circumferential edges of the sheet, with the transverse sheet being reversed at each end of its path, the width of the transverse sheet being narrowed between the outer circumferential edge and the inner circumferential edge; holding the transverse sheet as it is lapped; pulling a plurality of substantially mutually parallel yarns or tows to form a helical longitudinal sheet with the density per unit area of the longitudinal sheet decreasing from its longitudinally outer edge to its longitudinally inner edge; superposing the helical longitudinal and transverse sheets and advancing them flat in continuous rotation; assembling together the lapped transverse sheet and the longitudinal sheet to form a helical two-dimensional sheet; and removing the helical two-dimensional sheet formed in this way.