Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"printhead"”.
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Electromagnetic Printhead Core for Programming Magnetic Pixels
… process and implementation of an electromagnetic printhead core used to generate varied flux patterns on said surfaces. The thesis also assess how the generated flux pixels, using an electromagnet, compare to those generated by permanent magnets, before offering some praxis for programmable …
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Design of a multipurpose optical printhead evaluation device, The
Includes bibliographical references.
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Positive pressure drop-on-demand printhead for Three-Dimensional Printing
In drop-on-demand printing, wetting out of the binder fluid onto the orifice face typically has been prevented by some combination of the following: coatings on the orifice face, high surface energy fluids, and negative pressure. This non-wetting approach is not practical for low surface energy …
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Development of a robust electrostatically deflecting printhead for three dimensional printing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Development of a reliable electrostatic multijet printhead for three dimensional printing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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TopSpot Vario: A novel microarrayer system for highly parallel picoliter dispensing
… Vario technology is a silicon micromachined printhead as it is for the standard TopSpot technology. Up to 24 different samples can be filled into the reservoirs which are ordered in a standard 384 well plate pattern. The one to one format change from the 6 by 4 ordered reservoir pattern with …
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Three dimensional printing : solenoid value-jet for continuous high-speed application
… operational reliability. The solenoid valve-jet printhead possesses key characteristics, which can be used in the design of a scaled-up 3 DP(TM) machine. An experimental study was conducted on the performance of the solenoid valve jet under variable pressure and operational frequency. A flow-rate …
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Core-shell printing of functional polymer filaments
… ink materials are extruded continuously from a printhead while the printhead is translated on a 3D positioning stage at a constant rate of travel. In the present work, core-shell printing techniques are introduced to expand the capabilities of direct-write assembly. Through the use of a …
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Design of a slurry layer forming station and improved fluid handling system for raster processes in 3DP®
… with a polymer binder deposited using a moving printhead. Traditional 3DPTM builds layers by spreading dry powder and prints binder using a rastering scheme with a continuous-jet printhead. For smaller parts and greater accuracy, a variation on the process called slurry 3DPTM (s3DPTM) uses …
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Precision control of continuous microcontact printing
… time. Nonideal properties inherent to the printhead system, including uncontrollability and unobservability, were quickly identified. Maximum potential control performance under these constraints was explored and demonstrated experimentally, and it was shown that the inherent limitations …
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Adjoint-based optimization for inkjet printing
In this thesis the flow inside inkjet printhead microchannels is analysed using a two- parameter low Mach number expansion of the compressible Navier–Stokes equations and a reduced order model for the free surface flow inside the inkjet nozzle. The channel flow is separated into equations for an …
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Metering and Routing of Liquid Quanta in Microfluidic Devices
… to generate a high resolution heterogeneous printhead.
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Kinematic Chain Modelling of Rotary System as Applied to a Selectric Typewriter
… This resulted in a final rotation of the printhead of .3079 radians, which is an increase of .0233 over the value obtained with no drive error. This same technique could be applied to determine the feasibility of future rotary manufacturing systems.
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Effect of binder drop placement strategy on surface finish of fine ceramic parts by 3D printing
… on these time domains, doublets composed of two printhead droplets spaced 40 and 80 pm apart were printed at different interarrival times. At short interarrival times, the doublet appeared to be roughly equivalent to a single drop primitive but slightly larger. As the interarrival time increased …
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Micromachined printheads for the direct evaporative patterning of organic materials
… of two generations of micromachined printheads developed to expand the possibilities of printing of organic optoelectronics. The design and fabrication of a compact electrostatic actuator enabling the first generation of printhead is first presented. It is then used to actuate a …
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Biofabrication of a Heart Wall Section using the FRESH Bioprinting Method
… printing. This printer came with a unique printhead design, allowing multiple materials to enter the chamber to print continuously. Lastly, it explores the 3D printing of hybrid tissue and the optimization of the printing process. The hybrid tissue creation started with two materials before …
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Toolpath Planning Methodology for Multi-Gantry Fused Filament Fabrication 3D Printing
… approach is to allow multiple collaborating printheads to work simultaneously on different parts of the same object. However, little research has been introduced to support the aforementioned approach. Hence a new toolpath planning methodology is proposed in this paper. The objectives are to …
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High throughput extrusion additive manufacturing – rate limits and system design
… serial nature of the process–a single printhead must traverse a trajectory that spans the entire built volume of the part while depositing material. As a result, the build rate is governed by the performance of the motion and extrusion systems. This thesis explores the influence of …
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Vector drop-on-demand production of tungsten carbide-cobalt tooling inserts by three dimensional printing
… particle size. Vector printing requires that the printhead trace and define the external geometries of a part before raster filling the interior, a new approach in comparison to conventional, raster-only printing. Drop-on-demand (DOD) printheads allow binder droplets to be ejected when needed …
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A three-dimensional printing machine to facilitate observation of printing phenomena
… carriage transports a powderbed, while the printhead remains stationary. Tests in which strobe illuminated images of crosshairs mounted on the moving carriage were obtained have demonstrated the ability to time a strobe flash to within +/- 1-2 microns. Strobe illuminated images of …
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