Membrane is provided with a surface structure formed by two families of crossing grooves or beads oriented at angles within a specified range to the radii drawn through the respective crossing points

摘要

The substantially axisymmetric membrane is provided with a surface structure formed by two families of crossing grooves or beads (5, 6) oriented at an angle from 20 deg to 65 deg to the radii drawn through the respective crossing points. Also claimed is an application of the membrane in a compressed air membrane pumps.