The present invention relates to a cutting blade having a blade body with a first material joined to a second material, a first face, a second face opposed to the first face, and a cutting edge, where the first face includes a first surface, and the second face includes a primary bevel having a convex or straight cross-sectional shape and a secondary bevel having a concave cross-sectional shape with a line connecting the two bevels, the primary bevel extending from the cutting edge to the line, where cutting edge and primary bevel are shaped in the second material. A first wedge angle θ.sub.1 between the first surface and the primary bevel or the tangent of the primary bevel through the cutting edge is greater than a second wedge angle θ.sub.2 between the first surface and the tangent of the secondary bevel. A hair removal device includes this cutting blade.

A method for manufacturing a razor cartridge component comprises continuously feeding an elongated band of material, separating one or more blade support elements from the elongated band of material, stabilizing the one or more separated blade support elements in a stationary position; providing one or more razor blades; and laser welding the one or more razor blades to respective ones of the stabilized one or more blade support elements.

A razor blade has a first and a second portion. The first portion has a cutting edge at an exterior end and is angled relative to the second portion by a bending process. A bent region that can be arcuate is intermediate the first and second portions. The razor blade is manufactured from martensitic stainless steel being mostly iron and having (by weight): 0.40 to 0.60% C; 0.30 to 0.55% Si; 0.70 to 0.90% Mn; 13.0 to 14.0% Cr; 0.50 to 1.0% Mo; and 0.03 to 0.2%, more preferably 0.03-0.1% N.

A method of manufacturing an edged tool on surfaces of which rusting and coloration hardly occur is provided. This method includes a plasma step which includes placing a metallic base having processed surfaces obtained by processing in a vacuum chamber, generating plasma in the vacuum chamber, and subjecting the metallic base to plasma treatment at a temperature of the metallic base adjusted to 280 to 325 C. to sharpen the processed surfaces to thereby obtain an edged tool precursor, and an oxidation step which includes reducing an internal temperature of the vacuum chamber to a specific temperature ranging from 100 to 225 C. after completion of generation of the plasma, and introducing an oxygen-containing gas into the vacuum chamber to form an oxide film on surfaces of the edged tool precursor.

An integrated multiple razor blade capable of effectively reducing skin damage caused by the blade, and a manufacturing method thereof are provided. The integrated multiple razor blade may include a frame portion and a razor blade portion. The frame portion has a predetermined length, and comprises a plurality of sections that are separated at a predetermined interval along one direction. The razor blade portion is formed integrally with the frame portion, and has a plurality of razor blades formed perpendicularly to the frame portion.

A method of manufacturing an edged tool on surfaces of which rusting and coloration hardly occur is provided. This method includes a plasma step which includes placing a metallic base having processed surfaces obtained by processing in a vacuum chamber, generating plasma in the vacuum chamber, and subjecting the metallic base to plasma treatment at a temperature of the metallic base adjusted to 280 to 325 C. to sharpen the processed surfaces to thereby obtain an edged tool precursor, and an oxidation step which includes reducing an internal temperature of the vacuum chamber to a specific temperature ranging from 100 to 225 C. after completion of generation of the plasma, and introducing an oxygen-containing gas into the vacuum chamber to form an oxide film on surfaces of the edged tool precursor.

A fixed blade and a method for manufacturing the fixed blade are provided. The fixed blade includes a base sheet. A blade teeth set, which consists of a plurality of cutting teeth, is provided on an edge of at least one side of the base sheet. A material removal groove is provided on an upper end face and/or a lower end face of the base sheet, such that a thickness of each cutting tooth of the blade teeth set is smaller than a thickness of the base sheet, and such that a tooth protrusion is formed on an upper end face and/or a lower end face of a tooth tip of each cutting tooth of the blade teeth set.