Document Type and Number:
Japanese Patent JPH042831
Kind Code:
B2
Abstract:
A method for manufacture of a sealing ring with a flanged sealing lip having hydrodynamically acting return transport properties in which a sealing lip is first generated by extrusion of a plastically deformable material through a ring nozzle having rotating inner and outer surfaces which are rotated relative to each other to impart a helical motion to the extruded material; the hydrodynamically acting return transport properties being a microscopically fine pleating of the surface of the extruded hollow cylinder. The extruded cylinder is then solidified and cut to a predetermined length. The cylinder is then widened in the radial direction at its front end by an assembly tool which shapes the cylinder into a trumpet-shaped sealing ring with a flanged sealing lip.
Application Number:
JP9503087A
Publication Date:
January 21, 1992
Filing Date:
April 17, 1987
Export Citation:
International Classes:
B29C57/00; B29D99/00; F16J15/32; B29C43/00
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