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Principle analysis of SLA / LCD / DLP light curing 3D printing

2022/03/11

SLA technology is the first generation of light curing mainstream technology. It has a variety of translation names in China, such as three-dimensional lithography, three-dimensional printing, light modeling and so on. SLA forming technology is not only the first rapid prototyping technology to appear and commercialize in the world, but also one of the most deeply studied and widely used rapid prototyping technologies.

The basic principle of SLA molding technology is mainly to use ultraviolet laser (355nm or 405nm) as the light source and use galvanometer system to control the laser spot scanning. The laser beam outlines the shape of the first layer of the object on the surface of liquid resin, then the manufacturing platform drops a certain distance (between 0.05-0.025mm), and then immerse the curing layer into liquid resin. This is repeated, Finally finish entity printing.

DLP (all digital projection display technology) projection principle is to project light through high-speed rotating red, blue and green discs, and then project it to DLP wafer for reflection imaging.

DLP technology was first developed by Texas Instruments. It is a rapid prototyping technology that solidifies photosensitive polymer liquid layer by layer through projector, so as to create 3D printed objects. This molding technology first uses the slicing software to slice the model, and the projector plays slides. Each layer of image produces photopolymerization reaction and solidification in the area where the resin layer is very thin to form a thin layer of parts. Then the molding table moves one layer, and the projector continues to play the next magic light film and continue to process the next layer. In this cycle, it goes straight to the end of printing, Therefore, not only the forming accuracy is high, but also the printing speed is very fast.

LCD light curing uses the imaging principle of LCD panel, uses optical projection through the red, green and blue primary color filter to filter out infrared and ultraviolet rays (infrared and ultraviolet rays have a certain damaging effect on LCD panels), and then projects the three primary colors through the three LCD panels to synthesize projection imaging. Due to the continuous optimization of LCD panels in recent years, the service life has also been improved a lot. The lamp bead light source of ordinary LCD 3D printer is not very uniform, so the price is relatively affordable, and the accuracy of the whole platform model is also uneven. Piocreat 3D has introduced integral light source technology, which has changed this situation, which is a huge benefit for dental and jewelry factories. It can save a lot of costs in mass production. For details, please pay attention to Piocreat LCD dental 3D printer dj89.
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