What Vat Photopolymerization is

Vat Photopolymerization [2].
Process
- The build platform lowers down into the resin vat by the layer thickness.
- UV light is used to cure the resin layer by layer. The platform moves downwards as additional layers are built on top of the existing layers.
- In some machines, a blade moves between layers to provide a smooth resin base to build the next layer on.
- The model is removed after the vat is drained of resin.
Curing Process
Once the model is complete, it cures in a special chamber with additional UV light [1]. When the resin is fully cured, the model is ready for use.
Materials
This process uses plastics and polymers, and the polymers must be UV-curable.
Equipment Used Today
Applications
Vat photopolymerization is used in several markets because the materials are easily accessible [1]. The method is useful for making various consumer products, like hearing aids. The manufacturer Sonova uses SLA in the production of hearing aids to create products customized to individual clients [1]. Another industry is the shoe industry; Adidas and Nike use this technology for serial production [1].
Pros and Cons
Pros:
- High level of accuracy [1]
- Smooth finishes [2]
- Faster printing time
- While many additive manufacturing processes need to trace the part pattern on each layer, Vat Polymerization can print by projecting the entire layer pattern on the liquid surface [3]
- Models might be used more for quick displays or views of a newly modeled part [3]
Cons:
- Support structures often required [1]
- Lengthy post-processing [1]
- Models are still not as good in terms of impact strength and lasting durability, especially when compared to injection molded parts [3]
Video Demonstration of the Vat Photopolymerization Process
References
[1] https://all3dp.com/2/main-types-additive-manufacturing/
[2] https://www.lboro.ac.uk/research/amrg/about/the7categoriesofadditivemanufacturing/vatphotopolymerisation/
[3] https://steemit.com/engineering/@djanky/vat-polymerization-pros-and-cons-or-additive-manufacturing