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Drop-on-demand (DoD) ink-jetting of hard particle suspensions with volume fraction Φ ∼ 0.25 has been surveyed using 1000 ultra-high speed videos as a function of particle size (d = 0.8—3.6 μm), with added 2 wt. % acrylic (250 kDa) or 0.5 wt. % cellulose (370 kDa) resin, and also compared with Newtonian analogues. Jet break-off times from 80 μm diameter nozzles were insensitive (120 ± 10 μs) to particle size, and resin jet break-off times were not significantly altered by >30 wt. % added particles. Different particle size grades can be jetted equally well in practice, while resin content effectively controls DoD break-off times.


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