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柔印网纹辊油墨转移特性研究 总被引:3,自引:3,他引:0
目的研究网纹辊向印版进行油墨转移的特性。方法将网纹辊结构简化为轴对称的梯形槽,使用有限元法对网纹辊油墨转移过程进行数值模拟,即模拟油墨从网纹辊向印版进行转移,并且加入网纹辊和印版滚筒的运动情况,研究了接触角、梯形槽高宽比和角速度对油墨转移的影响。结果分析了油墨从网纹辊转移到印版的影响因素,油墨转移率随着上板接触角的增加而减小,随着梯形槽接触角的增大而增大,梯形槽高宽比越小和角速度越大,油墨转移率越高。结论通过对柔印网纹辊油墨转移情况进行数值模拟,得到了接触角、梯形槽高宽比及角速度对油墨转移情况的影响规律,为柔印生产实践提供了理论参考。 相似文献
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关于提高彩色喷墨打印纸吸墨涂层特性的探讨 总被引:6,自引:1,他引:5
在归纳和分析近年来国外对彩色喷墨打印过程的动力学研究试验结果的基础上,包括从接触、湿润、流散、吸收、固定至干燥各个阶段的进程,本文提出了有关提高彩色喷墨打印纸吸墨涂层特性的主要目标和措施。 相似文献
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良好印刷的过程是油墨精确定量转移的过程.油墨在从墨斗→墨斗辊→墨辊→印版→橡皮布→承印物表面的转移过程中,油墨适性、水墨平衡、印版、橡皮布的性能及纸张、印刷压力等因素都会影响油墨的传递.本文研究了单色胶印机印刷速度对油墨转移的影响,为取得稳定的油墨转移,应将供墨量、印刷速度及印刷机输墨性能参数三者有机结合起来. 相似文献
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油墨颜料颗粒对油墨触变性的影响分析 总被引:2,自引:2,他引:0
当油墨流体流动速度呈梯度分布时,以颜料颗粒简化模型为例分析了颜料颗粒在速度场中所受的力矩,在油墨流体速度梯度增大的过程中颜料颗粒在力矩作用下产生转动,而在油墨流体速度梯度减小的过程中不存在颜料颗粒的旋转,用颗粒的这一运动差别由统计方法较好地解释了颜料颗粒对油墨触变性的影响,分析表明颜料颗粒形状的非对称性是产生油墨触变性的重要因素之一. 相似文献
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目的 为研究丝网印刷参数对过墨量的影响,建立关于油墨动压和印刷参数之间的理论模型以及油墨动压与过墨量之间的有限元模型。方法 以流体力学理论研究丝网印刷参数与油墨动压的关系,通过有限元方法构建油墨动压与过墨量的关系曲线,最终设计实验对仿真结果进行验证。结果 仿真与实验的网孔过墨率与楔形动压曲线表明,网孔过墨率与楔形动压呈正相关,并且仿真结果与实验结果误差在10%以内。结论 丝网印刷仿真结果基本与印刷实验结果吻合,印刷参数与过墨量之间关系能较好地估计印刷参数对过墨量的影响,为实现过墨量的控制提供了理论指导。 相似文献
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柔性版印刷油墨转移规律的探讨 总被引:4,自引:3,他引:1
对柔性版印刷油墨转移的过程进行分析,得出油墨转移规律,并指出在印刷过程中,应根据印品上所需要的墨量,确定网纹辊的主要技术参数,这是实现合理的传墨量,达到印刷过程中油墨平衡,保证印刷质量的根本途径。 相似文献
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复合片材柔性版印刷的关键因素 总被引:1,自引:1,他引:0
针对目前复合片材柔性版印刷工艺,结合印刷设备、印刷油墨以及承印材料等要素,系统地分析了印前和印刷过程质量影响要素。通过对生产实际的分析与研究表明,影响复合片材的卫星式柔性版印刷质量的主要因素是张力控制、压力调节及UV油墨干燥控制。 相似文献
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Printed antennas with variable conductive ink layer thickness 总被引:2,自引:0,他引:2
J. Siden M.K. Fein A. Koptyug H.-E. Nilsson 《Microwaves, Antennas & Propagation, IET》2007,1(2):401-407
One of the complex tasks in mass production of RF electronics is printing the communication antenna using electrically conductive ink. For example, this is very common for radio- frequency identification (RFID) tags. Electrical properties of the ink are mostly determined by conductive (e.g. silver) particles mixed into the ink solution and the way they `connect' in the cured ink. It is also desirable to minimise the amount of ink used per antenna, because high-conducting metals like silver used in the ink are rather expensive. Metal-based inks have limited conductivity, so the thicker the cured ink layer will be the better the antenna radiation efficiency can be achieved, but also the higher will be the costs. In the paper, the authors report on the investigations of the possibility of minimising the amount of ink used per antenna. This can be achieved by printing thicker ink layers, where antenna structures are known to have high current density. Two common antenna structures and a dedicated antenna for passive RFID are used in the investigation. The main result of the paper is that radiation efficiency depends primarily on the total amount of ink used for printing the antenna, rather than on the variations of the layer thickness within the antenna structure 相似文献
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胶印印刷压力对油墨转移性能的影响 总被引:1,自引:1,他引:0
目的研究不同印刷压力下CMYK四色油墨的油墨转移率的变化趋势。方法采用控制变量法对胶印印刷压力和油墨转移之间的关系进行深入研究,运用IGT C1-5印刷适性仪印刷胶版纸,印刷速度相同,在不同的印刷压力下进行实验。结果得到了CMYK 4种油墨不同印刷压力下在胶版纸上印刷的油墨转移率数据,利用Matlab软件对所得数据进行拟合,得到了印刷压力与油墨转移率的关系曲线和方程。结论油墨转移率随印刷压力的增加而显著增大,在胶版纸上印刷压力达到450 N左右时,油墨转移率最大,随后油墨转移率随着印刷压力的增加而降低。经软件分析油墨转移率和印刷压力呈五次曲线关系。 相似文献
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为了用喷墨打印机打印出能防水的彩色照片,分别用普通水溶性和油溶性墨、普通照片级打印纸和防水打印纸打印同样的照片.进行平行的对比试验。结果证明,不管是水溶性墨或者油溶性墨,打印在不防水的普通照相级打印纸上,都不能防水,必需用塑料薄膜作过塑处理后才能防水;而打印在防水打印纸上的图像,不管用水溶性或油溶性墨,都能防水。本文介绍详细的试验过程和结果。 相似文献
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接触印刷分为2个不同的阶段:压印过程和自由渗透过程。采用渗流理论优化了接触印刷加压过程中油墨的渗透深度,避免了Olsson方程对毛细管半径的简化。自由渗透阶段,考虑到了动态接触角随动态接触线速度变化的因素,采用了动态润湿方程使得油墨的自由渗透深度计算更为准确,最后采用分形理论完成了毛细管半径的计算,进而完成了油墨渗透深度的研究。 相似文献
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This paper reports on the microscopic assessment of representative specimen cross-sections prepared by microtomy and ultramicrotomy with emphasis in structure–property information using optical, scanning and transmission electron microscopy, namely, the absolute optical density δ, the measured effective printing coverage
, the averaged pigment-based ink layer thickness
, and the morphology at 100% nominal printing coverage. This work shows that for different test patches printed at the same nominal printing coverage a number of different printing schemes yield a pre-defined absolute optical density δ which basically depends on the measured effective printing coverage
and the type of pigment-based inks used (spectral absorptivity m≠∞) and therefore on the averaged pigment-based ink layer thickness
. A method for estimating the spectral absorptivity m is presented which combines the absolute optical density δ of the test patch and the averaged pigment-based ink layer thickness
as measured from cross-sectional electron microscopy. 相似文献
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Y. K. XUE D. T. GETHIN C. H. LIM 《International journal for numerical methods in engineering》1996,39(15):2531-2554
This paper presents a numerical routine to compute the contact characteristics of elastomer layered cylinders lubricated by isoviscous liquids. The indentation of the elastic layer is calculated from boundary integral equations which are solved by linear and quadratic boundary element methods for a finite plane model and a circular representation of the junction. The hydrodynamic equation is also transformed into a boundary integral equation and solved by Simpson's rule. Some factors which possibly affect numerical accuracy are examined. Examples for finite plane and circular layer are analysed with reference to parameters for printing press roller contact, in which results are obtained for the indentation, film thickness and liquid pressure, as well as internal stresses through the simultaneous solution of the elasticity and hydrodynamic equations. The results show that high precision is easily achieved and the method is efficient for such layered problems. 相似文献