Digital Light Processing (Digital Light Processing, DLP) 3 d printing technology

DLP technology mainly through step by step a projector to curing photosensitive polymer liquid. DLP device contains a can accommodate the resin tank, used for serving can be a particular wavelength after uv irradiation curing of resin, below the DLP imaging system in the tank, the imaging plane is located in the bottom of the tank, through the energy and graphic control, each can be a certain thickness and shape of thin layers of resin, curing exposure after the completion of each section will object from a resin, create space for not curable resin at the bottom of the container, and form the next layer of the object, or to the next layer of curing to the next layer at the top, so as to create a 3 d printing. And SLA are very similar, the only difference is that the security of ultraviolet light projection lamp light single digital image created in a single image to curing photosensitive resin, and the SLA is the single point scanning for curing photosensitive resin. So DLP printing speed with SLA to.

Its craft route is: use CAD to do 3 d model - > to slice the model projection layer - > Settings - > UV light beam according to the design of the surface of the projection light liquid photosensitive resin to form the resin curing layer, to generate parts of a section to knee down a layer of highly - solidified layer is covered a layer of liquid resin - for the second projection - the second curing strong adhesive curing in the previous layer on to repeat the above process, get on top of 3 d model prototype.

DLP digital light processing 3 d printing disadvantages:

The projected image is composed of many small squares like count, then the image edge was formed some sawtooth. EnvisionTEC company adopts patent technology diffusion three-dimensional objects pixelated surface on the edge of the two methods: 1, enhance resolution module ladder shape problem in half, regardless of the object is big is small. So, even with the same resolution of projector, EnvisionTEC DLP printer to print out the surface at least twice than its rivals is smooth. 2, 3 d object edge diffusion technology, is gray edge diffusion technology continue to soften the rest of the sawtooth pattern, gray smooth edge, layer 3 d printing is realized. EnvisionTEC DLP printer to print out the high precision of DLP parts, can be accurate to microns, smooth surface almost do not need to post processing.

Advantage:

1, the forming of high precision, good quality;

2, forming surface smooth;

3, molding speed, faster than the SLA and forming techniques.

Disadvantage: