Browsing by Subject "Liquid crystal display"

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Large-volume LCD additive manufacturing : printing high-viscosity and low-reactivity elastomeric resins
(2022-08-12) Rodriguez, Nicholas Anthony; Crawford, Richard H.; Seepersad, Carolyn; Cullinan, Michael A; Duoss, Eric B
This work details the design and fabrication of a large-volume LCD 3D printer that is capable of printing structures that exceed 30 cm per dimension from high-viscosity, paste-like elastomeric resins as well as low-reactivity resins that need orders of magnitude greater exposures of light to cure than traditional SLA resins. A detailed overview is presented of the printer design and capabilities including a novel method of recoating high-viscosity resins for SLA and a roll-to-roll film tensioning technique to greatly reduce the separation force experienced by the printed structure between each layer. This work also describes the scaling of a novel light-patterning technique that uses dual LCDs with wire grid polarizers that can pattern high-intensity UV light over areas exceeding 30 cm per dimension with 8K resolution. This technique enables the polarization and patterning of high-intensity UV light, resulting in shorter curing times and the ability to print a wider range of stereolithography feedstocks. The ability to print with both high-viscosity elastomers and low-reactivity resins allows for the additive manufacturing of new classes of materials that could not previously be printed using vat polymerization techniques. These include highly reinforced silicone nanoparticle composites, high-molecular weight polymers including silicones and acrylate or methacrylate resins, and low-reactivity resins such as photocurable platinum-catalyzed liquid silicone rubber.