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US 4,381,273 AGranted
Method of co-extruding a reinforced composite foamed resin channel-shaped sealing strip having an abraded surface portion
AssigneeSaiag S.p.A. Industria Articoli Gomma
InventorRoberto Azzola
Life of this patent
Estimating the term…
Abstract
The sealing strip includes a channel-shaped attachment profile of rubber, in which a metallic reinforcing strip is embedded; this profile has an external coating layer of sponge rubber with an outer surface rendered velvety by abrasion.
Claims4
A process for manufacturing a sealing strip for vehicle bodies comprising a channel-shaped attachment profile of solid rubber having embedded therein a metallic reinforcing strip, comprising the steps of:
- co-extruding with the attachment profile a layer of sponge rubber coating the outer surface of the profile;
- co-vulcanizing the profile and the coating layer thereon;
- and abrading the exposed surface of the coating layer to render said surface velvety.
The process of claim 5, wherein:
- a sealing bead of sponge rubber is co-extruded together with the attachment profile and coating layer;
- separate feed flows of different expandible rubber blends are used to obtain the sealing bead and the coating layer;
- the respective expandible blends for the sealing bead and coating layer differing in softness or color.
Dependencies are inferred from the claim text.