Method for fabricating multi-color cellulose acetate spectacle frame

A method for fabricating a multi-color cellulose acetate spectacle frame, the method comprising:

• providing a multi-color cellulose acetate sheet having color layers with specific thicknesses, wherein the multi-color cellulose acetate sheet includes multiple layers in its thickness direction, each layer having a color;
• designing and making an oil pressing die;
• placing the multi-color cellulose acetate sheet in an oven for first baking;
• placing the multi-color cellulose acetate sheet in the oil pressing die mounted on an oil pressing machine, so as to enable second, third, and fourth color layers of the multi-color cellulose acetate sheet to move a distance greater than the thickness of a surface color layer of the multi-color cellulose acetate sheet by the oil pressing machine;
• grinding off or shaving off a surface layer of an excessively moved portion by a water grinder;
• placing the processed multi-color cellulose acetate sheet in the oven for second baking;
• placing the baked multi-color cellulose acetate sheet in a precision pressing die of a hydraulic press for pressing, so as to enable the moved portion of the multi-color cellulose acetate sheet to move a certain distance again;
• placing the multi-color cellulose acetate sheet in a cooling liquid for first cooling;
• cutting the multi-color cellulose acetate sheet by a CNC engraving and cutting machine;
• cutting inner rings of the multi-color cellulose acetate sheet by the CNC engraving and cutting machine to form a spectacle rim;
• placing the multi-color cellulose acetate sheet in the cooling liquid for second cooling;
• and
• mounting spectacle frame fittings on the formed spectacle rim.