Process of making a seal with grooved surface
AssigneeFirma Carl Freudenberg
InventorsErnst-Moritz von Arndt, G unter Stein
Life of this patent
Estimating the term…
Abstract
A rod or piston seal with a seal body made of a polymeric material, which contacts the surface that is being sealed and is capable of relative displacement with a sealing surface. The sealing surface is interrupted in the movement direction by at least two grooves, extending in the peripheral direction, that have a spacing between them. The spacing consists of at least one land that extends in the axial direction between the mutually adjacent grooves, such that the ratio A between the width of the land and the width of the grooves in the movement direction is 1:2 to 200:1, the ratio B between the width and depth of the grooves is 10:1 to 1:5, and the depth of the grooves has a value of 1 to 200 .mu.m.
Claims3
A method of manufacturing a seal comprising the steps of:
- providing a seal body made of polymeric material and comprising a sealing surface;
- providing a laser producing a laser beam;
- passing said laser beam through a mask;
- imaging said laser beam on said sealing surface after said step of passing said laser beam through a mask to thereby produce at least two grooves on said sealing surface.
Dependencies are inferred from the claim text.