Non-stick cooking utensil
The invention relates to a non-stick cooking utensil, wherein protrusions are arranged on interior wall of the utensil to form a non-smooth surface, said protrusion has a height of 20-999 μm and a projection area of 314-783431 μm 2 with respect to the interior surface of the utensil, the protrusions are so distributed that the total projection area of protrusions on the surface of the interior wall is about 10%-60% of the surface area, a coating film is formed on said non-smooth surface with protrusions. As compared with utensils with smooth surface, the sticking intensity and stickiness between foods and the utensil of present invention may be decreased by 60%-80%.
1. A non-stick cooking utensil having inner walls, wherein the inner walls have a non-smooth surface with convex units, the height (h) of the units ranges from 20 μm to 999 μm and the projection area of the convex units on the surface of the inner wall ranges from 314 μm 2 to 783431 μm 2 , wherein each convex unit has a spherical crown shape that includes a spherical portion on top of a cylindrical portion, and a bottom circle diameter (φ) of the spherical crown ranges from 20 μm to 999 μm, wherein the distribution density of the convex units, defined as the ratio of the total geometrical projection area of the convex units on the base body surface of the inner wall to the area of the base body surface, ranges from 10% to 60%; and wherein an oxidized surface film is formed on the surfaces of the non-smooth convex units.
2. The non-stick cooking utensil of claim 1 , wherein each convex unit is shaped like a cylinder, and the diameter (φ) of the cylinder ranges from 20 μm to 999 μm.
3. The non-stick cooking utensil of claim 1 , wherein the oxidized surface film is formed by materials selected from the group consisting of phosphor, iron, aluminum, chromium and titanium.
4. The non-stick cooking utensil of claim 1 , wherein the surface film is a phosphatized film.
5. The non-stick cooking utensil of claim 1 , wherein the surface film is a metal film having at least one of titanium and chromium, or a nitrided film of metal and nitrogen.