Wang Xi, Carr Wallace W, Bucknall David G, Morris Jeffrey F
FUJIFILM Dimatix, Inc., Lebanon, New Hampshire 03766, USA.
Rev Sci Instrum. 2010 Jun;81(6):065106. doi: 10.1063/1.3449478.
A capillary viscometer developed to measure the apparent shear viscosity of inkjet inks at high apparent shear rates encountered during inkjet printing is described. By using the Weissenberg-Rabinowitsch equation, true shear viscosity versus true shear rate is obtained. The device is comprised of a constant-flow generator, a static pressure monitoring device, a high precision submillimeter capillary die, and a high stiffness flow path. The system, which is calibrated using standard Newtonian low-viscosity silicone oil, can be easily operated and maintained. Results for measurement of the shear-rate-dependent viscosity of carbon-black pigmented water-based inkjet inks at shear rates up to 2 x 10(5) s(-1) are discussed. The Cross model was found to closely fit the experimental data. Inkjet ink samples with similar low-shear-rate viscosities exhibited significantly different shear viscosities at high shear rates depending on particle loading.
本文描述了一种毛细管粘度计，该粘度计用于测量喷墨印刷过程中在高表观剪切速率下喷墨油墨的表观剪切粘度。通过使用魏森堡-拉宾诺维奇方程，可得到真实剪切粘度与真实剪切速率的关系。该装置由恒流发生器、静压监测装置、高精度亚毫米毛细管模头和高刚度流路组成。该系统使用标准牛顿低粘度硅油进行校准，操作和维护都很简便。讨论了在高达2×10⁵ s⁻¹ 的剪切速率下，对炭黑颜料水性喷墨油墨的剪切速率依赖性粘度的测量结果。发现Cross模型能很好地拟合实验数据。具有相似低剪切速率粘度的喷墨油墨样品，在高剪切速率下，根据颗粒负载量的不同，表现出显著不同的剪切粘度。
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