The curing performance of different 3D printing photosensitive resins varies, which are light cured under the same 3D printer. 2 characteristic parameters, critical exposure and transmission depth, were used to characterize the photosensitivity of photosensitive adhesives, and the mathematical relationship between critical exposure and transmission depth was explored. The measuring methods of critical exposure and penetration depth were studied. The effects of light intensity and resin color on resin curing were measured. Under certain conditions, the penetration depth generally increased with the increase of light intensity,and the critical exposure also increased with the increase of light intensity. Light colors have higher penetration depth than dark colors, and require higher critical exposure. The depth of cure decreases with increasing concentration of photoinitiator. The critical exposure decreases firstly with the increase of photoinitiator concentration, and then tends to be flat.

3DP  /  resin  /  penetration depth  /  critical exposure