Patent ID: 7185404
Filing Date: 2007-03-06
Classification: D04H,F16D

Abstract:
1. A method of making a helical fiber sheet, the method comprising the following steps: bringing at least one transverse fiber sheet and lapping it while guiding it 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 rotation; and assembling together the lapped transverse sheet and the longitudinal sheet to form a helical sheet.