Recently, through the news reports and interviews, the author found that: inkjet 3D printing technology is developing vigorously. Among them, sand-type 3D printing equipment and multi-jet melting equipment have continuously obtained large-scale orders, and most of them sneak into the night with the wind, and the moisturizing materials are silent. It is believed that this technology will bloom everywhere in the near future, driving the entire 3D printing technology into the era of real mass industrial production.
The inkjet 3D printing core device is an inkjet printhead. There are two types of inkjet printheads: piezoelectric and thermal foaming. The industrial grade piezoelectric inkjet printhead has 256 to 2048 orifices. Each orifice is sprayed with a 2PL-80PL volume of ink droplets at a frequency of 1000-200000HZ. Assuming that an inkjet 3D printer has 100 2048 piezoelectric nozzles, this machine can inject up to 4.096E10 ink drops per second. This molding speed can be achieved in small and medium batch production. Because the thermal foaming nozzle can deposit a larger number of orifices per unit area, there is still room for growth if the thermal foaming inkjet printhead is used. The working principle of the inkjet print head determines that the inkjet 3D printing has the characteristics of fast printing speed and high molding precision.
Similarly, due to the complicated structure of the ink jet print head and the small diameter of the nozzle (generally 20um-40um), there is a high requirement for the surface tension, viscosity and particle size of the ink. If the ink is not doing well, it will break the ink, scatter, plug and so on. When the ink hits the surface of the substrate or powder at a speed of 5-10 m/s, diffusion, penetration and even sputtering may occur. If the parameters are improperly set, the molding quality will be greatly affected. So do inkjet 3D printing technology, the R & D team must have a good knowledge of inkjet printing, a certain understanding of materials and ink. From the perspective of team members of foreign excellent inkjet 3D printing companies, corporate members have long-term inkjet technology experience. In domestic enterprises engaged in inkjet 3D printing technology, Ai Sikai has mastered the technology of piezoelectric nozzles, which deserves everyone's attention.
At present, there are many kinds of inkjet 3D printing inks, and the bonding materials are various. The following table lists some common materials:
Since most inkjet 3D printing processes (previously) are carried out under normal temperature and pressure without support, inkjet 3D printing technology has a wide range of materials to choose from compared to other 3D printing technologies. At present, the materials required for this technology are basically produced by foreign companies, and the material prices are high. The vast number of domestic scientific research institutions and materials companies should further increase the research on inkjet 3D printing materials and accelerate the development of China's inkjet 3D printing technology.
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