Razor blade technology

摘要

A razor cartridge includes razor blade assemblies having an inter-blade guard attached to a side of a razor blade. The razor blade is formed from strip that is manufactured including a thermal oxidation process to form a chromium oxide layer on the side surface of the razor blade. This oxide film prevents electrochemical corrosion of the razor blade that may be visible to a user and prevents real or perceived premature failure of the razor blade and thus the razor cartridge during its extended life. The razor blade assembly may also have an array of closely spaced droplets of a liquid adapted to inhibit corrosion of the razor blade applied to the side of the razor blade visible to a user.

主权项

1. A method of making a razor blade assembly for a razor cartridge, comprising the steps of:
a) providing a razor blade comprising a stainless steel of a first composition, the razor blade having a first side and a cutting edge extending along a front edge thereof, the razor blade further having been processed to effect a martensitic transformation thereof to harden the razor blade; b) providing a chromium oxide layer on the first side by a thermal oxidation process of free chromium, defined as chromium of the stainless steel unreacted with carbon of the stainless steel, at the surface of the stainless steel to enhance corrosion resistance; and c) permanently joining an inter-blade guard to the first side of the razor blade, the inter-blade guard comprising a stainless steel of a second composition and including a surface adapted to contact a skin surface of a user during a normal use of the razor cartridge including the razor blade assembly.