| 摘要 |
PCT No. PCT/FI94/00053 Sec. 371 Date Sep. 25, 1995 Sec. 102(e) Date Sep. 25, 1995 PCT Filed Feb. 10, 1994 PCT Pub. No. WO94/17990 PCT Pub. Date Aug. 18, 1994A formed piece comprises a substantially cylindrical outer surface layer of sheet material extending along a longitudinal axis of the formed piece from a first end to a second end of the formed piece, and inner layers of sheet material within the outer surface layer randomly arranged and creating air gaps between at least a portion of the inner layers. The surface layer and inner layers of sheet material are twisted around the longitudinal axis of the formed piece and along the length of the longitudinal axis. |
