Disclosed here are shaving razor systems and methods including razor cartridges with a unitary frame having a length and width, a topside and an underside, wherein the unitary frame includes angled joints or bends connecting at least three guards running lengthwise on the unitary frame, the guards separated by at least three gaps in the frame, and at least three blades, affixed to the underside of the guards of the unitary frame, wherein the at least three blades include edges, and wherein the blade edges extend into the gaps in the frame when affixed to the underside of the guards of the unitary frame.

A razor blade is proposed. The razor blade may include a substrate having a cutting edge formed at a tip. A thickness T4 of the substrate measured at a distance of 4 ?m from the tip may be between 1.00 ?m and 1.70 ?m. A thickness T250 of the substrate measured at a distance of 250 ?m from the tip may be between 44 ?m and 60.56 ?m, for example between 47.5 ?m and 60.56 ?m. A ratio of the T4 to the T250 may be 0.032 or less. A rate of increase in thickness in a first section in a region distanced 40 ?m to 100 ?m from the tip may be less than a rate of increase in thickness in a second section in a region distanced 100 ?m or more from the tip.

A method of making a razor cartridge including providing at least one razor blade having a cutting edge extending along a length of the razor blade and printing at least one printed object on the length is provided. The razor blade is positioned between the guard and the cap where the visible surface of the at least one razor blade includes a printed object. The printed object may extend continuously along the length of the razor blade and/or may have multiple portions having a comb-like structure. The printed object appears as a solid object to a viewer's naked eye. The solid object includes a plurality of printed ink dots not visible to the viewer's naked eye. The printed object of flexible, polymer ink may act as a guard element on the razor blade which helps with glide and to manage a user's skin (e.g., bulge) during shaving.

A method of making a razor cartridge including providing at least one razor blade having a cutting edge extending along a length of the razor blade and printing at least one printed object on the length is provided. The razor blade is positioned between the guard and the cap where the visible surface of the at least one razor blade includes a printed object. The printed object may extend continuously along the length of the razor blade and/or may have multiple portions having a comb-like structure. The printed object appears as a solid object to a viewer's naked eye. The solid object includes a plurality of printed ink dots not visible to the viewer's naked eye. The printed object of flexible, polymer ink may act as a guard element on the razor blade which helps with glide and to manage a user's skin (e.g., bulge) during shaving.

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.

This invention relates to razor blades, and more particularly to laser produced markings on razor blades and processes thereof.

Sensor-based systems and methods of analyzing shaving performance. A shaving device comprises a handle having a connecting structure connected to a hair-cutting implement (e.g., a blade). Sensor data is collected from sensor(s) associated with the shaving device during one or more shaving strokes of a user shaving with the shaving device. Shave stroke data is determined from the sensor data that defines one or more shaving strokes. The shave stroke data and a threshold value is input into a model (e.g., an artificial intelligence model) to output a user-specific shave score. Generation of the user-specific shave score comprises comparing the shave stroke data to the threshold value to determine a deviation from the threshold value. An output is generated based on the user-specific shave score.

Sensor-based systems and methods of analyzing shaving performance. A shaving device comprises a handle having a connecting structure connected to a hair-cutting implement (e.g., a blade). Sensor data is collected from sensor(s) associated with the shaving device during one or more shaving strokes of a user shaving with the shaving device. Shave stroke data is determined from the sensor data that defines one or more shaving strokes. The shave stroke data and a threshold value is input into a model (e.g., an artificial intelligence model) to output a user-specific shave score. Generation of the user-specific shave score comprises comparing the shave stroke data to the threshold value to determine a deviation from the threshold value. An output is generated based on the user-specific shave score.

A sacrificial anode contains a powerful magnet which pulls it against an object comprising ferromagnetic metal and thus fastens the anode to the ferromagnetic metal. The magnet itself is encased in an electrically inert substance and thus does not corrode.

A method of making a razor cartridge including providing at least one razor blade having a cutting edge extending along a length of the razor blade and printing at least one printed object on the length is provided. The razor blade is positioned between the guard and the cap where the visible surface of the at least one razor blade includes a printed object. The printed object may extend continuously along the length of the razor blade and/or may have multiple portions having a comb-like structure. The printed object appears as a solid object to a viewer's naked eye. The solid object includes a plurality of printed ink dots not visible to the viewer's naked eye. The printed object of flexible, polymer ink may act as a guard element on the razor blade which helps with glide and to manage a user's skin (e.g., bulge) during shaving.