Spin casting curing uses which energy source?

Spin casting curing uses which energy source?

• A. UV Light
• B. Infrared Light
• C. Microwave
• D. Visible Light

Answer: (A)

Spin casting curing relies on photopolymerization: the resin contains a photoinitiator that absorbs light and generates radicals to start the polymer cross-linking. Exposing the liquid resin to ultraviolet light activates these initiators, causing rapid, controlled curing as the part spins to create a uniform lens thickness. Infrared or microwave energy mainly adds heat and isn’t capable of reliably triggering the photochemical reaction needed for this resin, and visible light would only work if a visible-light initiator were used—which isn’t the traditional setup for spin casting lenses. Therefore ultraviolet light is the appropriate energy source.

Spin casting curing relies on photopolymerization: the resin contains a photoinitiator that absorbs light and generates radicals to start the polymer cross-linking. Exposing the liquid resin to ultraviolet light activates these initiators, causing rapid, controlled curing as the part spins to create a uniform lens thickness. Infrared or microwave energy mainly adds heat and isn’t capable of reliably triggering the photochemical reaction needed for this resin, and visible light would only work if a visible-light initiator were used—which isn’t the traditional setup for spin casting lenses. Therefore ultraviolet light is the appropriate energy source.