压电喷墨印刷墨滴成形及特性研究

发布时间：2018-04-01 04:32

本文选题：数字印刷　切入点：表面张力　出处：《华南理工大学》2013年博士论文

【摘要】：随着数字印刷技术的快速发展,压电喷墨技术作为一种经济、耐用、高效的喷墨技术得到广泛应用。喷墨墨滴作为图像复制的基本单元,承担着图像组成、阶调再现以及颜色复制的基本功能,在印刷复制技术中有着重要的地位。喷墨墨滴的形成、墨滴在介质中的飞行轨迹、墨点在飞行过程中的形态变化,墨滴在承印物表面的干燥特性以及墨滴到达承印物后的状态,都是影响墨滴在印刷复制中的各种功能的基本因素。而压电喷墨技术作为数字喷墨技术的主要方式之一,其产生墨滴尺寸的大小以及尺寸的稳定性,墨滴产生过程中拖尾现象的出现以及由此产生的卫星墨滴,墨滴产生瞬间的速度,墨滴飞行过程中的动态表面张力等都将是数字压电喷墨技术的研究内容。简言之,喷墨过程的研究是为了实现喷墨过程的可控化,标准化和高速化。本论文立足于射流基础理论,通过建立数学模型,计算机模拟和实验研究对喷墨过程进行了系统研究,得出了有效模拟数字压电喷墨墨滴产生的数学模型。在墨滴产生的基础理论上对墨滴在移动承印物上的形态、墨滴飞行轨迹、墨滴干燥以及墨滴动态表面张力等问题进行了深入研究,取得了一定的成果。论文的主要工作和创新点包括： (1)对喷墨过程进行了理论建模,确定了模型的边界条件,并在设定的边界条件下对方程求解,得出了喷墨墨滴的理论参数值,然后通过Fluent软件在相同边界条件下对喷墨过程进行模拟,得出了与理论计算结果较为接近的模拟值,最后通过实验验证了数学模型在墨滴产生过程中能够有效模拟喷墨过程的结论。 (2)建立了压电喷墨数学模型,分析了油墨表面张力、物理粘度、油墨压力等参数对墨滴状态的影响。详细讨论了表面张力在墨滴形成过程中的作用,尤其是在相同条件下,油墨表面张力与墨滴形成过程之间的关系。 (3)深入研究了压电喷墨墨滴飞行轨迹。通过建立数学模型分析在水平和垂直状态下墨滴的飞行状态及飞行轨迹,最后通过实验验证了该方法的可行性。 (4)针对正在研发阶段的卷筒料数字喷墨设备,本论文讨论了在承印物移动状态下墨点的定位特性该模型能够有效的判断在承印物移动状态下的喷墨质量。 (5)对墨滴的快速干燥问题做了深入探讨,建立了基于烘干热风风速和温度的油墨干燥数学模型,为解决高速喷墨印刷干燥问题提供了理论依据,并在此基础上设计了一种高效的油墨烘干装置。 (6)提出了一种基于墨滴轮廓拟合的表面张力计算方法,该方法是一种有效的获得油墨动态表面张力方法。最后,对本文的主要内容以及所取得的主要研究成果进行概括性总结,并对论文中存在的不足进行了分析探讨,为后续的研究工作提出了一些个人见解。
[Abstract]:With the rapid development of digital printing technology, piezoelectric inkjet technology as an economic, durable, efficient inkjet technology has been widely used. The basic functions of tone reproduction and color reproduction play an important role in printing reproduction technology. The formation of inkjet droplets, the flight path of ink drops in the medium, and the morphological changes of ink points during flight, The drying characteristics of ink droplets on the substrate surface and the state of ink droplets reaching the substrate are the basic factors that affect the functions of ink droplets in printing reproduction. Piezoelectric ink jet technology is one of the main methods of digital ink jet technology. The size and stability of the droplet produced, the appearance of the tail phenomenon during the droplet generation and the resulting satellite droplet, the instantaneous speed of the droplet, The dynamic surface tension in the flying process of ink droplets will be the research content of digital piezoelectric inkjet technology. In short, the research of ink jet process is to realize the controllability of ink jet process. Standardization and high speed. Based on the basic theory of jet, this paper systematically studies the inkjet process by establishing mathematical model, computer simulation and experimental research. The mathematical model of the effective simulation of the digital piezoelectric ink jet droplet is obtained. In the basic theory of the ink droplet generation, the shape of the ink drop on the moving substrate, the droplet flight path, The problems of droplet drying and droplet dynamic surface tension have been deeply studied, and some achievements have been obtained. The main work and innovations of this paper include:. 1) the theoretical modeling of the ink jet process is carried out, the boundary conditions of the model are determined, and the equations are solved under the given boundary conditions, and the theoretical parameters of the ink jet droplet are obtained. Then the ink-jet process is simulated under the same boundary condition by Fluent software, and the simulation value is obtained, which is close to the theoretical calculation result. Finally, the conclusion that the mathematical model can effectively simulate the ink jet process in the process of ink droplet generation is verified by experiments. (2) the mathematical model of piezoelectric ink jet is established, and the influence of the parameters of ink surface tension, physical viscosity and ink pressure on the droplet state is analyzed. The effect of surface tension on the formation of ink droplets is discussed in detail, especially under the same conditions. Ink surface tension and ink droplet formation process. (3) the flight trajectory of piezoelectric ink jet droplet is studied in depth, and the flying state and trajectory of the droplet in horizontal and vertical state are analyzed by establishing mathematical model. Finally, the feasibility of the method is verified by experiments. This paper discusses the localization characteristics of ink points in the state of substrate movement. The model can effectively judge the quality of ink jet in the state of substrate movement. In this paper, the rapid drying of ink droplets is discussed, and the mathematical model of ink drying based on drying hot air velocity and temperature is established, which provides a theoretical basis for solving the problem of high speed inkjet printing drying. On this basis, an efficient ink drying device is designed. A method for calculating surface tension based on the profile fitting of ink droplets is proposed, which is an effective method for obtaining dynamic surface tension of ink. Finally, the main contents of this paper and the main research results are summarized, and the shortcomings of the paper are analyzed and discussed, and some personal opinions are put forward for the subsequent research work.
【学位授予单位】：华南理工大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TS853.5

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