首页> 外文会议>2000 International Printing amp; Graphic Arts Oct 1-4, 2000, Savannah, GA >COATING IMBIBITION RATE STUDIES OF OFFSET INKS: a novel determination of ink-on-paper viscosity and solids concentration using the ink tack force-time integral
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COATING IMBIBITION RATE STUDIES OF OFFSET INKS: a novel determination of ink-on-paper viscosity and solids concentration using the ink tack force-time integral

机译:胶印油墨的涂层吸收速率研究:使用油墨粘着力-时间积分来确定纸张上的油墨粘度和固体浓度的新方法

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Comparison of structure relaxation of a presheared offset ink with observed ink tack development on both non-absorbent substrates of different smoothness and surface free energy, and on a representative absorbent multi-coated paper, determined as a function of time, is achieved using oscillatory and shear rheometry and the SeGan Ink Surface Interaction Tester (ISIT), respectively. By incorporating the extrapolated viscosity properties of the ink toward increasing concentration, a mutual relation is sought and developed to establish the viscosity character of the ink on the substrate such that ink-on-paper viscosity and solids content can be derived from the tack force measurement. The viscosity extrapolation is derived initially from viscosity data obtained under progressive dilution with mineral oil and then compared with the individual force-time integrals of the ISIT, constant acceleration, ink tack pull-off curves during tack rise (Gane et al, 1994) to obtain a predicted volume loss of fluid from the ink. The role of intrinsic ink/rubber blanket adhesion is assumed inherently as a continuous boundary condition but the "sealing" effect at the substrate surface, which is dependent on ink amount, roughness and ink mobility, strongly influences the evidence of cavitation, which contributes an important component of the observed tack force especially on very smooth and non-absorbent substrates. An earlier proposed model adopting a geometry of parallel plate separation in a fluid medium (Xiang and Bousfield, 1998) is compared with tack results and a considerable mismatch is found for the method under study. Better agreement is found using an analysis of the tack force-time integrals, footprint area and an uniaxial extensional viscous term from which an improved model of the tack-force mechanism is presented. This novel approach allows the solids and viscous parameters of the ink to be analysed as the initial ink setting actually occurs on real papers.
机译:通过使用振荡和振动,可以将预剪切胶印油墨的结构松弛与在不同光滑度和表面自由能的非吸收性基材上以及在代表性的吸收性多层涂料纸上观察到的油墨粘性发展进行比较,并确定它们是时间的函数。剪切流变仪和SeGan油墨表面相互作用测试仪(ISIT)。通过并入油墨的外推粘度特性以提高浓度,寻求并发展了一种相互关系,以建立基材上油墨的粘度特性,从而可以从粘着力测量中得出纸上油墨的粘度和固体含量。粘度外推最初是从在矿物油中逐渐稀释后获得的粘度数据中得出的,然后与ISIT的各个力时积分,恒定加速度,增粘过程中的油墨粘着力下降曲线进行比较(Gane等,1994)。从墨水中获得预计的流体体积损失。固有的油墨/橡胶毯粘附力的作用被固有地假定为连续边界条件,但是基材表面的“密封”效果取决于油墨量,粗糙度和油墨流动性,强烈影响了气穴现象,这有助于观察到的粘着力的重要组成部分,尤其是在非常光滑和不吸收的基材上。将较早提出的在流体介质中采用平行板分离的几何形状的模型(Xiang和Bousfield,1998)与粘性结果进行了比较,发现所研究的方法存在明显的不匹配。通过对粘着力-时间积分,覆盖面积和单轴拉伸粘性项进行分析,可以找到更好的一致性,从而提出改进的粘着力机制模型。这种新颖的方法可以分析墨水的固体和粘性参数,因为初始墨水设置实际上是在实际纸张上发生的。

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