New 3D printing technology will be opaque China synthetic resin network / Xing Xiuyan / 2022-05-26 13:10:40 69160
A team of engineers at the Federal Institute of Technology (EPFL) in Lausanne, Switzerland, has developed a 3D printing method that can use light to turn opaque resins into objects in seconds. This breakthrough may have good application prospects in the biomedical industry, for example, it can be used to manufacture artificial arteries. The related research was recently published in the journal advanced science. Objects made of grease


It took engineers only 20 seconds to make a miniature statue of Yoda in Star Wars.
As early as 2017, engineers from the applied Photonic Devices Laboratory (LAPD) of EPFL Institute of Engineering designed a 3D printer that can produce objects almost instantaneously. Five years later, the team improved their printing equipment and methods to produce items made of opaque resin, which had not been possible before.
EPFL's 3D printer is one of the fastest printers in the world. Most 3D printers work by depositing materials layer by layer, a process known as additive manufacturing. EPFL uses the volumetric method, that is, the resin is poured into the container and rotated. The engineer irradiates the container with light from different angles, so that when the energy accumulated in the resin exceeds a given level, it will solidify. This is a very precise method to make objects with the same resolution as existing 3D printing technology.
This volumetric method can be applied to almost any shape of object. It took engineers only 20 seconds to make a miniature statue of Yoda in Star Wars, while the traditional manufacturing process took about 10 minutes.
Light can cure the resin by interacting with photosensitive compounds contained in the plastic. Engineers said that the new method is only effective when the light passes through the resin in a straight line without deviation, and the light in the opaque resin cannot spread smoothly. To this end, they designed a solution.
First, they used a camera to observe the path of light through the resin, and then adjusted the calculation to compensate for light distortion. They also programmed the printer to run calculations and correct the light, which ensured that the machine could reach the energy required to cure the resin in time. As a result, engineers were able to print objects in opaque resins with almost the same accuracy as transparent resins, which was a major breakthrough.
Next, engineers hope to use new methods to print several materials at the same time, and improve the printer's resolution from one tenth of a millimeter to micrometers.

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