| 主权项 |
1. A screening apparatus of pulp and paper industry, the screening apparatus comprising:
a screen cylinder and a turbulence creating means rotating relative to the screen cylinder, the turbulence creating means having turbulence elements fastened thereon, each of the turbulence elements facing the screen cylinder and comprising: a longitudinal centerline (CL); a length (L) in a direction of an axis of the turbulence creating means; two longitudinal edges, a leading edge and a trailing edge; two opposite ends, a first end and a second end; and two surfaces, a top surface facing the screen cylinder and a bottom surface, each of the two surfaces arranged between the leading edge and the trailing edge; the top surface divided into a leading surface having an origin at the leading edge, and a trailing surface having an origin at the trailing edge, the leading and trailing surfaces meeting at a peak-line, and the leading surface having a circumferential length between the leading edge and the peak-line and the leading surface having undulations (U), wherein each of the undulations extends at most for the entire circumferential length of the leading surface, and wherein the leading surface forms an acute angle with the bottom surface of the turbulence element for the entire length (L) thereof. |
