Recently US Patent Office published an application (US20140134334 A1), which was filed on Oct 31, 2013. This application was made to get a patent for ‘a 3D extrusion print process for producing multicolored three-dimensional objects.” As per application, this process would produce mechanically stable, multicolored 3D objects with good color definition.
The best-known laser-based 3D printing process, which is at the same time the oldest, is stereolithography (SLA). In this process, a liquid composition of a radiation-curable polymer is hardened layer-by-layer by using a laser. The person skilled in the art can clearly see that the only possibility with a workpiece produced by this method is subsequent coloring on the surface. This is complicated and time-consuming. But, this new 3D printing process technology which will work over three different stages can be used for the production of multicoloured objects is the UV ink-jet process. In this three-stage process, a pulverulent material is applied in thin layers, a UV-curable liquid is printed in the form of the respective layer of the subsequent three-dimensional product onto the said layers, and finally the printed layer is hardened by using a UV source. These steps are repeated layer-by-layer.
To have a look at entire application please click HERE.
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