Stereolithography (SLA) – The Ideal Choice for High-Precision 3D Printing
Stereolithography (SLA or SL) is a high-precision 3D printing technology using photosensitive resin as raw material. This technology leverages the rapid curing properties of photosensitive resin under specific wavelength UV laser irradiation, enabling the efficient fabrication of complex 3D structures through layer-by-layer fabrication.
During the fabrication process, liquid photosensitive resin undergoes immediate polymerization and solidification when exposed to UV light (wavelength range approximately 250-400nm). The SLA machine precisely focuses the UV laser onto the surface of the photosensitive resin, gradually curing the resin from point to line and then from line to surface, achieving precise cross-sectional depictions of each layer. Layer by layer, a rigorous and detailed 3D model is constructed.
Stereolithography offers advantages such as high molding precision, smooth surfaces, and high-resolution detail reproduction. It is widely used in industrial model making, medical device design, jewelry design, mold manufacturing, and high-end prototyping. Its rapid and precise fabrication significantly shortens product development cycles, bringing greater flexibility and innovation to the manufacturing industry.
SLA (Stereolithography) is not only a key representative technology in 3D printing, but also a highly efficient solution for achieving high-quality prototyping and small-batch customized production, helping companies achieve higher standards in precision manufacturing.
Free Radical Photosensitive Resins:
Advantages: Low cost, fast cure, good toughness, low viscosity
Disadvantages: Significant oxygen inhibition, high shrinkage, warping of printed products, low precision, and the need for secondary curing
Cationic Photosensitive Resins:
Advantages: Minimal volume shrinkage upon cure, high reaction rate, no need for secondary curing after molding, unaffected by oxygen inhibition, good dimensional stability, excellent mechanical properties, and high precision
Disadvantages: Slow reaction rate, high viscosity, vinyl ethers have a high exposure dose and slow cure; epoxies are brittle
Hybrid Systems:
Acrylate-epoxy hybrid systems combine the two aforementioned curing principles, with cationic and free radical initiators acting together.
3D printing resins are categorized into free radical photosensitive resins, cationic photosensitive resins, and hybrid systems. Ever Ray, a manufacturer with 20 years of experience specializing in the production and development of photocurable resins, boasts an annual production capacity of 20,000 tons, a comprehensive product line, and the ability to customize products. 3D printing resins include Polyurethane 7224-1, 7200, 7296-1, and 7253A-5.
