Patent ID: 11193223

Abstract:
A method of forming an annular textile preform by needling a helical fiber sheet includes in succession: unwinding a helical fiber sheet from a horizontal sheet-forming turntable driven at a constant and predefined speed of rotation NFS onto a horizontal intermediate unwinder driven at a speed of rotation NDI and positioned on a horizontal intermediate turntable driven at a speed of rotation NFI, unwinding the helical fiber sheet from the intermediate unwinder onto a final horizontal unwinder driven at a speed of rotation NDF, and unwinding the fiber sheet from the final unwinder onto a horizontal preform-forming turntable driven at a variable and predefined speed of rotation NFP so as to be subjected to needling thereon. The speeds NDI, NFI, and NDF are controlled in such a manner that NDF is proportional to NFP, NFI=(NFS−NDF)/2, and NDI=(NFS+NDF)/2.