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 24 for “"Print quality"”.
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3D print quality in the context of PLA color
3D printing is a hot topic in manufacturing and a truly useful tool, but it has limitations. Print quality properties - like raft peelability, dimensional tolerance and surface roughness - are hard to calibrate perfectly. A common material used in fused deposition modeling (FDM) printers is …
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Research on Print Defect Visibility and Evaluation
<p>Banding is a well-known artifact produced by printing systems. It usually appears as lines perpendicular to the process direction of the print. Therefore, banding is an important print quality issue which has been analyzed and assessed by many researchers. However, little literature has focused …
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Determining Optimal Halftone Angles for CMYK Printing
CMYK halftone prints are all around us, yet the halftone angles used to generate these prints are traditionally set to specific values without substantial documentation explaining why these angles are optimal. Investigating the optimization of these angles is important for enhancing print quality …
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Numerical tools for rate-cost-quality analysis of laser-based additive manufacturing
… considerations required to reliably produce high quality AM components economically. To quantitatively assess the tradeoffs between build rate, resolution and cost for AM processes, we present a physics-based rate and cost estimator for scanning laser based AM. The model takes a mesh …
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Noise analysis of inkjet printers over stages and quality of the job and frequency sources from equipment in laboratory optical trap room
… level of sound emitted over the course of the print cycle by an HP inkjet printer and determined how the level varies with changes in the print quality settings and stages of the print cycle. As a test document was printed on the printer at various print quality settings and in two different …
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Paper and printed paper surface characteristics studied using an optical method
… has been improved to be able to evaluate printed surfaces. Experiments were conducted with solid prints prepared on two types of papers printed with a heatset yellow ink. Both paper surfaces and printed surfaces are characterized into two regions: above the surface plane resulting in …
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Laser scanner jitter characterization, page content analysis for optimal rendering, and understanding image graininess
… is widely used in imaging systems such as laser printers and office copiers. In the EP process, laser scanner jitter is a common artifact that mainly appears along the scan direction due to the condition of polygon facets. Prior studies have not focused on the periodic characteristic of laser …
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Understanding and developing capabilities for large area and continuous micro contact printing
Micro contact printing is a high spatial resolution-patterning tool that can be used for printing on large and non-planar surfaces because of which it has begun to find important applications in printed organic electronics and fiber optics. However, problems like achieving precise alignment and …
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Design and manufacturing of high precision roll-to-roll multi-layer printing machine : measurement and experiment
… of roll-to-roll technology in micro-contact printing was developed. In this research, the prototype machine was upgraded by designing and machining a device that could fabricate a flat stamp with significantly less variance. The print roll wrapping system was reconfigured in order to capture …
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Design and manufacturing of high precision roll-to-roll multilayer printing machine -- machine upgrade
… students built a roll to roll machine for printing thiol onto a flexible gold substrate by self-assembly. The machine demonstrated good performance in high speed printing (400 ft/min). Since single layer printing is limited in industrial application, we reconfigured this machine for …
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Development of an inking system for continuous roll-to-roll microcontact printing of hexadecanethiol (HDT) on gold-coated PET
Microcontact printing is a form of soft lithography that employs a molded polymer stamp to print substrates with pattern features as small as the sub-micron range. This is traditionally a plate-to-plate printing process, employing both flat stamps and flat, rigid substrates. However, to utilize …
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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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Analysis of linear motion systems for a large scale FDM 3D printer
3D printers have been around for quite some time in one way or another. Only in resent years with programs such as Reprap, an open source 3D printer that can self replicate a lot of it's own parts, has helped greatly in bringing 3D printing into the price range and homes of hobbyists. When …
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Black-box printer models and their applications
<p>In the electrophotographic printing process, the deposition of toner within the area of a given printer addressable pixel is strongly influenced by the values of its neighboring pixels. The interaction between neighboring pixels, which is commonly referred to as dot-gain, is complicated. The …
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The Influence of Time-Dependent Rheology on the Multiple Scales of 3D Printing with Cementitious Materials
3D printing of cementitious materials has gained tremendous momentum in recent years as a way of directly constructing full structures and infrastructure and as an enabler for bio-inspired hierarchical design, with control extending from the printed filament scale to the full structure scale. …
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A study of lithographic ink and water interactions
… ink/water balance is crucial for acceptable print quality; this involves factors affecting the emulsification of water and ink. This process was investigated with two designed model ink varnishes (one being 'hydrophilic' relative to the other 'hydrophobic' varnish) and two commercial …
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Process and Material Modifications to Enable New Material for Material Extrusion Additive Manufacturing
… within poly(PEG8k-co-CaSIP) resulted in the best print quality due to the higher viscosity (105 Pa∙s) allowing the material to hold shape in the melt and the high-nucleation producing small spherulites mitigating the layer warping. Fillers were then explored to observe if an ionic filler would …
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