# US 10,244,891 B2 · Kitchen appliance coated by dot method and method of preparing the same

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- Number: US 10,244,891 B2
- Document ID: US10244891B2
- Status: Granted
- Kind: B2
- Application number: 14/726,835
- Filed: 2015-06-01
- Published: 2015-12-17
- Granted: 2019-04-02
- Earliest claimed: 2014-06-16
- Applicants: Ryong Kim
- Inventors: Ryong Kim
- Web page: https://patentgrep.com/patent/US10244891B2

## CPC

- A47J 36/02: Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
- A47J 36/025: {Vessels with non-stick features, e.g. coatings}
- B05D 5/02: to obtain a matt or rough surface
- B05D 5/06: to obtain multicolour or other optical effects (B05D5/02 takes precedence)
- B05D 5/08: to obtain an anti-friction or anti-adhesive surface (rendering particulate materials free-flowing in general, e.g. making them hydrophobic B01J2/30)
- B05D 7/56: {Three layers or more}
- B05D 1/02: performed by spraying
- B05D 2202/00: Metallic substrate
- B05D 2401/32: applied as powders
- Y10T 428/24372: Particulate matter
- A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided are a kitchen appliance coated by a dot method including a primer coating layer formed on a surface of the kitchen appliance, and a dot layer formed in a dot shape on a surface of the primer coating layer by repetitive point spraying a coating solution of dot particles, wherein the dot particles are individually adhered to the primer coating layer by the point spraying to form a surface, the dot particles has an average diameter of 5 μm to 10 mm when being adhered to the primer coating layer by the point spraying, an area ratio of the dot layer to the primer coating layer is in a range of 60% to 98%, the dot layer is spattered by a point spraying method in which the dot layer is formed by overlapping 0 to 20 layers of the dot particles, various colors of the dot layer are obtained by simultaneously or individually point spraying through a plurality of nozzles respectively including coating solutions of various colors, and a liquid component of the dot particles point sprayed in a form of a liquid is dried during drying to be separated into the individual dot particle to cause irregularities at an upper end portion of the dot layer in view of the entire dot layer, and a method of preparing the kitchen appliance.

## Claims

### Claim 1

A kitchen appliance coated by a dot method, the kitchen appliance comprising:
a primer coating layer formed on a surface of the kitchen appliance, wherein a thickness of the primer coating is in a range of 10 um to 12 um, wherein the primer coating layer comprises 63 wt % to 74 wt % of polyamideimide dissolved in N-methyl-2-pyrrolidone (NMP), 3 wt % to 5 wt % of water, 15 wt % to 18 wt % of a polytetrafluoroethylene (PTFE) dispersion, 2 wt % to 4 wt % of a carbon black dispersion, and 6 wt % to 10 wt % of a silica dispersion;
a dot layer formed in a dot shape on a surface of the primer coating layer by repetitive point spraying a coating solution of dot particles, wherein a thickness of the dot layer is in a range of 130 um to 150 um; and
a top coating layer is further formed on the dot layer, the top coat having a thickness in a range of 8 um to 12 um;
wherein the dot particles are individually adhered to the primer coating layer by the point spraying to form a surface and has an average diameter of 5 um to 10 mm when being adhered to the primer coating layer by the point spraying;
wherein an area ratio of the dot layer to the primer coating layer is in a range of 60% to 98%;
wherein the dot layer is spattered by a point spraying method in which the dot layer is formed by overlapping 0 to 20 layers of the dot particles and various colors of the dot layer are obtained by simultaneously or individually point spraying through a plurality of nozzles respectively including coating solutions of various colors; and
wherein a liquid component of the dot particles point sprayed in a form of a liquid is dried during drying to be separated into the individual dot particle to cause irregularities at an upper end portion of the dot layer in view of the entire dot layer.

### Claim 2 (depends on 1)

The kitchen appliance coated by a dot method of claim 1, wherein the dot layer is formed by point spraying at a pressure of 0.2 MP to 1.0 MP.

### Claim 3 (depends on 1)

The kitchen appliance coated by a dot method of claim 1, wherein the various colors of the dot layer are obtained by simultaneously point spraying through a plurality of nozzles a plurality of coating solutions of various colors to obtained a desired color.

### Claim 4 (depends on 1)

The kitchen appliance coated by a dot method of claim 1, wherein the dot layer comprises 86 wt % to 92 wt % of a polytetrafluoroethylene (PTFE) dispersion, 5.5 wt % to 6.53 wt % of a water, 0.5 wt % to 1.5 wt % of an aromatic hydrocarbon, 0.2 wt % to 0.5 wt % of a triethylamine, 0.2 wt % to 0.5 wt % of an oleic acid, 0.1 wt % to 0.4 wt % of a surfactant, and 1.5 wt % to 3.5 wt % of an inorganic pigment.

### Claim 5 (depends on 1)

The kitchen appliance coated by a dot method of claim 1, wherein the top coat comprises 86 wt % to 92 wt % of a polytetrafluoroethylene (PTFE) dispersion, 5.5 wt % to 6.53 wt % of a water, 0.5 wt % to 1.5 wt % of an aromatic hydrocarbon, 0.2 wt % to 0.5 wt % of a triethylamine, 0.2 wt % to 0.5 wt % of an oleic acid, 0.1 wt % to 0.4 wt % of a surfactant, and 1.5 wt % to 3.5 wt % of a mica.