In this paper, the previous work is extended to rather quite frequent cases in digital printing, such as miss hit and/or the mixture of colors when printing on impervious substrates. For this purpose, a new set-up was built consisting of at least two multi-nozzle printheads mounted on translation and rotation tables which can be used to simulate different printing situations. The experimental methods are based on visualization techniques such as high speed cinematography for large drops and phase controlled ultra short snap shots of the impact process when micro-sized drops are used. The experiments are performed at low enough velocities and the emphasis is now given to asymmetric configurations.
Image processing with specific algorithms helps to delineate the contour of the merging drops and to follow accurately the drainage of the interface film and the subsequent coalescence process. The experimental results are shown to compare favourably with theory for drops colliding at low velocity. Experiments close to actual operating conditions are also performed and the merging behavior is detailed for both axisymmetric and non-axisymmetric configurations. Finally the stability of the printed pattern is analyzed and discussed with relevance to the spreading behavior of drops on differently wetting substrates.
Document Type: Research Article
Publication date: 01 January 2004
For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.
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