The thickness of a surface decoration layer is increased without significantly deteriorating the representation of the tone and the gradation of the color. A method for producing a three-dimensional object includes forming a surface decoration layer 11 using white material 15, at least one coloring material 13 other than white, and clear material 14, and using the at least one coloring material 13 and the clear material 14. The surface decoration layer 11 includes a plurality of layers formed by building a plurality of layer bodies one above the other. At least one of the layer bodies is formed with the white material 15 in at least one location among the lowermost layer of the surface decoration layer 11 and a region of an internal formation region 12 close to the surface decoration layer 11. The internal formation region constitutes an internal portion of the three-dimensional object. The plurality of layers constituting the surface decoration layer 11 includes the same color. When the plurality of layers are deposited, the density of the color visually recognized when the three-dimensional object is observed is adjusted to be greater than the density of the color of each of the plurality of layers.

Such internal decoration is implemented that an object looks a target color as viewed in any direction, and that the object is colored and has image depiction in any cross-section. A method is provided for producing a three-dimensional object by extruding a build material to form a layer corresponding to each of cross-sections obtained by slicing a target object by a plurality of parallel planes, and depositing such layers in sequence so as to form the three-dimensional object. A white material 15 and one or two or more decoration materials 13 of colors other than white, which solidify wider a predetermined condition after extruded from nozzles, are used as the build material. The decoration materials 13 and the white material 15 are mixed to form the layer.

The present invention relates to a three-dimensional (3D) printing method, and more particularly, to a full-color or substantially full-color 3D printing method. A 3D printing method according to an aspect of the present invention is a 3D printing method for fabricating a solid object 3D object by depositing a plurality of layers, The 3D printing method comprising: preparing a print medium including a color particle and a curable material of a liquid state, the curable material containing the color particle, wherein the color particle includes a photonic crystal particle and has a structural color defined according to a particle distance; preparing a 3D modeling data for the 3Dobject, wherein the 3D modeling data includes a layer data for at least one of the plurality of layers, and the layer data includes a shape data having a coordinate to be cured in the layer and a color data having a color value of the coordinate; preparing a working area for a specific layer of the plurality of layers, wherein the working area is a space having a predetermined thickness inward from a one surface of the printing medium; imparting a color to the print medium, wherein the color is imparted by adjusting the structural color of the color particles based on the color value of the color data among the layer data for the specific layer; by curing the curable material based on the coordinate of the shape data of the layer data for the specific layer, fixing the color imparted to the print medium and simultaneously fabricating the specific layer.

A method of operating a three-dimensional object printer to form printed images on a surface of an object with increased color resolution includes generating a plurality of low-precision tone reproduction curves (TRCs) from a plurality of high-precision color conversion entries that are modified by a plurality of values in a one-to-one correspondence to the TRCs. The method further comprises generating modified contone image and halftone image data for each plane using one of the low-precision TRCs and forming the image from multiple printed layers of ink corresponding to the plurality of planes.

In one aspect, methods of printing a 3D article are described herein. In some embodiments, a method of printing a 3D article comprises selectively depositing a first portion of build material in a fluid state onto a substrate to form a first region of build material; selectively depositing a first portion of support material in a fluid state to form a first region of support material; and selectively depositing a second portion of build material in a fluid state to form a second region of build material, wherein the first region of support material is disposed between the first region of build material and the second region of build material in a z-direction of the article. In some cases, the first region of support material forms a grayscale pattern and/or a CMY color pattern in combination with the first region of build material and/or the second region of build material.

A Light Emitting Diode (LED) fluorescent cover comprises the following components by weight: 90-96% of single-component solid silicone rubber, 3-8% of fluorescent powder and 1-2% of vulcanizer; and the preparation method includes the following steps: step 1): using mixed compound of the single-component solid silicone rubber, as well as the fluorescent powder and the vulcanizer as raw material to mix, standing for 2-4 h after mixing with open mill or internal mixer; step 2): controlling temperature, pressure and vulcanization time of vulcanizing machine according to size of the fluorescent cover mold, using the vulcanizing machine to carry out first vulcanization to the raw material that is obtained from the step 1) and placed in the fluorescent cover mold; step 3): with combined action of blower gun, taking the fluorescent cover out slowly; step 4): baking the semi-finished product in a closed space at a temperature of 150-200 C. for 1-2 h.

A three-dimensional (3D) continuous color printer includes one or more cartridges each with a building material stored therein, a mixer coupled to each cartridge, and a single printhead coupled to a mixer output, wherein the building material stored in the cartridge is transported to the mixer and the single print head to form a continuous color object.

A three-dimensional (3D) continuous color printer includes one or more cartridges each with a building material stored therein, a mixer coupled to each cartridge, and a single printhead coupled to a mixer output, wherein the building material stored in the cartridge is transported to the mixer and the single print head to form a continuous color object.

A Light Emitting Diode (LED) fluorescent cover comprises the following components by weight: 90-96% of single-component solid silicone rubber, 3-8% of fluorescent powder and 1-2% of vulcanizer; and the preparation method includes the following steps: step 1): using mixed compound of the single-component solid silicone rubber, as well as the fluorescent powder and the vulcanizer as raw material to mix, standing for 2-4 h after mixing with open mill or internal mixer; step 2): controlling temperature, pressure and vulcanization time of vulcanizing machine according to size of the fluorescent cover mold, using the vulcanizing machine to carry out first vulcanization to the raw material that is obtained from the step 1) and placed in the fluorescent cover mold; step 3): with combined action of blower gun, taking the fluorescent cover out slowly; step 4): baking the semi-finished product in a closed space at a temperature of 150-200 C. for 1-2 h.

A Light Emitting Diode (LED) fluorescent cover comprises the following components by weight: 90-96% of single-component solid silicone rubber, 3-8% of fluorescent powder and 1-2% of vulcanizer; and the preparation method includes the following steps: step 1): using mixed compound of the single-component solid silicone rubber, as well as the fluorescent powder and the vulcanizer as raw material to mix, standing for 2-4 h after mixing with open mill or internal mixer; step 2): controlling temperature, pressure and vulcanization time of vulcanizing machine according to size of the fluorescent cover mould, using the vulcanizing machine to carry out first vulcanization to the raw material that is obtained from the step 1) and placed in the fluorescent cover mould; step 3): with combined action of blower gun, taking the fluorescent cover out slowly; step 4): baking the semi-finished product in a closed space at a temperature of 150-200 C. for 1-2 h.