Herb grinder
A herb grinder includes a metal sheet having a first surface and an opposite second surface. the sheet being configured to include, on at least one of the surfaces, a plurality of grooves extending parallel with one another and spaced apart from one another, wherein the grooves and said at least one of the surfaces, a plurality of grooves extending parallel with one another and spaced apart from one another, wherein the grooves and at least one of the surfaces define a square wave shape having flat valleys and flat peaks, wherein the flat valleys are roughened by a process of photochemical etching. A plurality of holes of a first type, extending from a peak to the bottom surface of the metal sheet, and a plurality of holes of a second type extending from a valley to the bottom surface of the metal sheet.
1. A herb grinder comprising:
a metal sheet having a first surface and second surface opposite the first surface, the sheet being configured to include, on the first surface, a plurality of grooves, each groove extending parallel with one another and spaced apart from one another, wherein the grooves and the first surface define, in cross section, a square wave shape having valleys and peaks, wherein each valley has a planar floor that is roughened to provide a finely abrasive surface, and each peak has a planar cap that is not roughened;
a plurality of holes of a first type, the first type of hole extending from a peak to the second surface of the metal sheet;
a plurality of holes of a second type, the second type of hole extending from a valley to the second surface of the metal sheet.
2. The herb grinder of claim 1 , wherein the valleys are roughened by a process of photochemical etching.
3. The herb grinder of claim 1 , wherein the metal sheet is between 0.2 mm and 2.0 mm thick.
4. The herb grinder of claim 1 , wherein the grooves are between 0.6 mm and 5.0 mm wide.
5. The herb grinder of claim 1 , wherein the grooves are between 0.025 mm and 0.2 mm deep.
6. The herb grinder of claim 1 , wherein the centers of the grooves are spaced apart between 1.2 mm and 10.0 mm.
7. The herb grinder of claim 1 , wherein the holes are shaped to be at least one of circular, square, diamond, elliptical, star, pentagon, or triangular.
8. The herb grinder of claim 1 , wherein the metal sheet is sized along its edges to be approximately the size of a credit card.