Razor blade

Patent metadata

Field	Value
Publication number	US-2017136641-A1
Application number	US-201715420814-A
Country	US
Kind code	A1
Filing date	Jan 31, 2017
Priority date	Jul 31, 2014
Publication date	May 18, 2017
Grant date	—

Abstract

A razor blade comprising a blade substrate with a blade edge substrate portion ending in blade tip. The razor blade is covered by a strengthening coating deposited on the blade edge substrate portion via a deposition process. The deposition process causes a hardness value of the strengthening coating layer to be increased, which, among other factors, allows for a decreased thickness of the blade substrate with coating. The blade substrate with coating has (i) a thickness of between about 1.57 and 2.37 micrometers measured at a distance of about five micrometers from the coating tip, (ii) a thickness of between about 4.62 and 6.74 micrometers measured at a distance of about twenty micrometers from the coating tip, and (iii) a thickness of between about 19.82 and 27.52 micrometers measured at a distance of about one hundred micrometers from the coating tip.

First claim

1 . A razor blade comprising:
a razor blade substrate having an edge portion, the edge portion having two substrate sides converging toward a substrate tip; and a coating formed on the edge portion, the coating including a strengthening coating layer and defining a coating tip, wherein,
a first thickness of the edge portion with the coating measured at a first distance of five micrometers from the coating tip is between 1.57 and 2.37 micrometers,
a second thickness of the edge portion with the coating measured at a second distance of twenty micrometers from the coating tip is between 4.62 and 6.74 micrometers, and
a third thickness of the edge portion with the coating measured at a third distance of hundred micrometers from the coating tip is between 19.82 and 27.52 micrometers.

2 . The razor blade of claim 1 ,
wherein,
the strengthening coating layer comprises a strengthening nanocrystalline layer made of a mixture of titanium and boron, with at least one of titanium-rich areas and boron-rich areas, where “rich” is used by reference to a stoichiometric TiB2 composition.

3 . The razor blade of claim 1 ,
wherein,
the strengthening coating layer is made of a mixture of titanium and boron, with an average proportion of boron atoms and titanium atoms between 1.3:1 and 2.3:1.

4 . The razor blade of claim 1 ,
wherein,
the strengthening coating layer includes a nanocrystalline layer comprising titanium diboride areas.

5 . The razor blade of claim 1 ,
wherein,
the strengthening coating layer includes featureless crystallites having a characteristic dimension between 2 and 15 nanometers.

6 . The razor blade of claim 1 ,
wherein,
the strengthening coating layer is deposited under a condition which, when applied to deposition on a sample, provide a coating having a density above 3.9 grams per cubic centimeter.

7 . The razor blade of claim 1 ,
wherein,
the razor blade substrate is made of stainless steel.

8 . The razor blade of claim 1 ,
wherein,
the coating includes an interlayer between the razor blade substrate and the strengthening coating layer.

9 . The razor blade of claim 8 ,
wherein,
the interlayer is made of titanium or chromium.

10 . The razor blade of claim 1 ,
wherein,
the coating includes a metal-containing overcoat layer over the strengthening coating layer.

11 . The razor blade of claim 10 ,
wherein,
the overcoat layer is made of chromium or titanium.

12 . The razor blade of claim 1 ,
wherein,
the coating only includes the strengthening coating layer.

13 . The razor blade of claim 1 ,
wherein,
a first thickness of the strengthening coating layer, measured normal to a side of the razor blade substrate is between 20 and 400 nanometers.

14 . The razor blade of claim 1 ,
wherein,
the coating includes a polymer coating on the strengthening coating layer.

15 . The razor blade of claim 1 ,
wherein,
the strengthening layer includes a plurality of areas with different proportions of titanium atoms and boron atoms.

16 . The razor blade of claim 15 ,
wherein,
the strengthening layer includes a first area of the plurality of areas with a proportion of boron atoms and titanium atoms between y:l and z:l, wherein y and z are between 1.3 and 1.99, and y is lower than z, and
the strengthening layer includes a first area of the plurality of areas with a proportion of boron atoms and titanium atoms in at least one of the plurality of areas is between u:l and v:l, wherein u and v are between 2.01 and 2.3 and u is lower than v.

17 . A razor head having a cartridge with the razor blade of claim 1 .

18 . A razor having a handle secured to the razor head of claim 17 .

19 . The razor blade of claim 1 ,
wherein,
a fourth thickness of the edge portion with the coating at a fourth distance of thirty micrometers from the coating tip is between 6.52 and 9.34 micrometers.

20 . The razor blade of claim 1 ,
wherein,
a fifth thickness of the edge portion with the coating at a fifth distance of forty micrometers from the coating tip is between 8.42 and 11.94 micrometers, and
a sixth thickness of the edge portion with the coating at a sixth distance of fifty micrometers from the coating tip is between 10.32 and 14.53 micrometers.

Assignees

• Bic Violex Sa

Inventors

• Siozios Anastasios
• Mavroeidis Konstantinos
• Kontokostas Labros
• Papatriantafyllou Ioannis
• Terlilis Taxiarchis

Classifications

• C23C14/3464

  using more than one target (C23C14/56 takes precedence) · CPC title

• C23C14/021

  Cleaning or etching treatments · CPC title

• C23C14/14

  Metallic material, boron or silicon · CPC title

• B26B21/60 Primary

  by the coating material · CPC title

• C23C14/067

  Borides · CPC title