Browsing by Subject "direct write printing"
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Item Pneumatic System Design for Direct Write 3D Printing(University of Texas at Austin, 2017) Holzman, Noah; Francis, LorraineDirect write 3D printing methods are interesting due to the diverse palette of materials available for the process. In this work, a pneumatic system for direct write printing is built using off-the-shelf hardware and synchronized with an open-source firmware for motion control. The time to steady-state pressure of the system is found to be ~150 ms for the range of pressures tested; this delay can lead to defects on the start of a path. Proof of concept is established by printing with a high viscosity, room temperature curing silicone using a 410 µm nozzle and 300 µm layer height. Test prints show a high degree of dimensional accuracy and consistent layer height over 10s of layers.Item Variables Impacting Feature Definition of Polyimide Using Syringe Based Printing(University of Texas at Austin, 2016) Whetten, S.R.; Lavin, J.M.; Keicher, D.M.; Appelhans, L.N.; Essien, M.; Mani, S.S.; Moore, P.B.; Cook, A.; Acree, N.A.; Young, N.P.; Russell, M.J.Direct write printing approaches provide an opportunity for additive manufacturing (AM) to impact the electronics industry through cost effective prototyping and manufacturing. Direct write printing of electronics also provides the opportunity for the electronics industry to be impacted by such things as new material research, fewer steps in processing, along with application specific packaging and component configuration. This paper illustrates how process variables affect the feature definition of polyimide film production via syringe deposition printing. This work compares the films as the process variables change, and describes which variables make the greatest impact on feature definition.