Color control of the multi-color printing device

Conventional color-printing systems often use inks of three hues, such as CMY, CMYK and CMYKLcLm, but in order to obtain more realistic color reproductions, the ink set of more than three hues has been adopted by some color-printing systems. It is difficult, however, to model the composed color with the multiple inks when the number of the output ink hues exceeds three due to the none-unique mapping between the color spaces of the CIE Lab and the multi-color printing device. In this paper, we propose a fine color-printing method for multi-color printing device with the ink set of more than three hues. The proposed approach has good color expression ability and provides fine control of the printed color. By dividing the output color space into several subspaces, our method allows one-to-one mapping between the standard color space and the multi-color output color space. It has been proved effective when applied to the digital inkjet printer—Mutoh8000.

Non-volatile dynamically switchable color display via chalcogenide stepwise cavity resonators

High-resolution multi-color printing relies upon pixelated optical nanostructures,which is crucial to promote color display by producing nonbleaching colors,yet requires simplicity in fabrication and dynamic switching.Antimony trisulfide(Sb_(2)S_(3))is a newly rising chalcogenide material that possesses prompt and significant transition of its optical characteristics in the visible region between amorphous and crystalline phases,which holds the key to color-varying devices.Herein,we proposed a dynamically switchable color printing method using Sb_(2)S_(3)-based stepwise pixelated Fabry-Pérot(FP)cavities with various cavity lengths.The device was fabricated by employing a direct laser patterning that is a less timeconsuming,more approachable,and low-cost technique.As switching the state of Sb_(2)S_(3) between amorphous and crystalline,the multi-color of stepwise pixelated FP cavities can be actively changed.The color variation is due to the profound change in the refractive index of Sb_(2)S_(3) over the visible spectrum during its phase transition.Moreover,we directly fabricated sub-50 nm nano-grating on ultrathin Sb_(2)S_(3) laminate via microsphere 800-nm femtosecond laser irradiation in far field.The minimum feature size can be further decreased down to~45 nm(λ/17)by varying the thickness of Sb_(2)S_(3) film.Ultrafast switchable Sb_(2)S_(3) photonic devices can take one step toward the next generation of inkless erasable papers or displays and enable information encryption,camouflaging surfaces,anticounterfeiting,etc.Importantly,our work explores the prospects of rapid and rewritable fabrication of periodic structures with nano-scale resolution and can serve as a guideline for further development of chalcogenide-based photonics components.

Innovative color jet 3D printing of levetiracetam personalized paediatric preparations

3D printing is a promising technology used in the fabrication of complex oral dosage delivery pharmaceuticals.This study first reports an innovative color jet 3D printing(CJ-3DP)technology to produce colorful cartoon levetiracetam pediatric preparations with high accuracy and reproducibility.For this study,the ideal printing ink consisted of 40%(v/v)isopropanol aqueous solution containing 0.05%(w/w)polyvinylpyrrolidone and 4%(w/w)glycerin,which was satisfied with scale-up of the production.The external and internal spatial structures of the tablets were designed to control the appearance and release,and cartoon tablets with admirable appearances and immediate release characteristics were printed.The dosage model showed a good linear relationship between the model volume and the tablet strength(r>0.999),which proved the potential of personalized administration.The surface roughness indicated that the appearance of the CJ-3DP tablets was significantly better than the first listed 3D printed drug(Spritam R).Moreover,the scanning electron microscopy and porosity results further showed that the tablets have a structure of loose interior and tight exterior,which could ensure good mechanical properties and rapid dispersion characteristics simultaneously.In conclusion,the innovative CJ-3DP technology can be used to fabricate personalized pediatric preparations for improved compliance.Due to the stable formulation and fabrication process,this technology has the potential in scale-up production.

Color Image Computer Desktop Printing System

Color image printing technique on ink jetting printer is introduced.Color shading method such as dithering,Amplitude Modulation(AM)screening and Frequency Modulation(FM)screening is presented.Some solutions to the problems with FM screening are given. An application program under Windows is developed.

Semi-Ellipsoid Nanoarray for Angle-Independent Plasmonic Color Printing

Employing a silver nano semi-ellipsoid nanoarray with high symmetry into applications in plasmonic color printing,we fulfill printing images with colors independent of observing angles.Also,by decreasing the period of a nano semi-ellipsoid array into deep-subwavelength scales,we obtain high reflectivity over 50%,promising high efficiency for imaging generations.A facile technique based on the transfer of anodized aluminum oxide template is developed to fabricate the silver nano semi-ellipsoid nanoarray,realizing plasmonic color printing with features of low cost,scalable,full color and high flexibility.Our approach provides a feasible way to address the angledependent issue in the previous practice of plasmonic color printing,and boosts this field on its way to real-world commercial applications.

CMAC Based Color Separation in Printing Images

To over come the drawbacks existing in current measurement methods for detecting and controlling colors in printing process, a new medal for color separation and dot recognition is proposed from a view of digital image processing and patter recognition. In this model, firstly data samples are collected from some color patches by the Fuzzy C-Means （FCM） method; then a classifier based on the Cerebellar Model Articulation Controller （CMAC） is constructed which is used to recognize color pattern of each pixel in a microscopic halftone image. The principle of color separation and the algorithm model are introduced and the experiments show the effectiveness of the CMAC-based classifier as opposed to the BP network.

Application of nonlinear color matching model to four-color ink-jet printing

Through discussing the color matching technology and its application in printing industry the conventional approaches commonly used in color matching, and the difficulties in color matching, a nonlinear color matching model based on two step learning is established by finding a linear model by learning pure color data first and then a nonlinear modification model by learning mixed color data. Nonlinear multiple regression is used to fit the parameters of the modification model. Nonlinear modification function is discovered by BACON system by learning mixture data. Experiment results indicate that nonlinear color conversion by two step learning can further improve the accuracy when it is used for straightforward conversion from RGB to CMYK. An improved separation model based on GCR concept is proposed to solve the problem of gray balance and it can be used for three to four color conversion as well. The method proposed has better learning ability and faster printing speed than other historical approaches when it is applied to four color ink jet printing.

Researchers Realize Full-color Printing with Single Transparent Ink

Color plays an important role in daily life and modern industry.Generally,color is generated by dyes or pigments rather than the transparent materials,and people have to use multiple inks to achieve different colors.However,a recent study by Institute of Chemistry of the Chinese Academy of Sciences(ICCAS)broke this cognition.The study,published in Science Advances,achieved the full-color structural-color printing with a single transparent polymer ink.

Dyeing and printing wastewater treatment using fly-ash coated with chitosan

Printing and dyeing industry is a considerable source of environmental contamination. In this study treatment of printing and dyeing wastewater with a new type of sewage treatment agent, fly-ash coated with chitosan particles （FCCP）, was examined. The effects ofpH, stirring time, sedimentation time and temperature on color, COD, turbidity and NH3-N removal were determined. The optimum dosage of FCCP and the influence of individual factors on removal efficiency were tested. The optimum parameters determined using the L16 （45） orthogonal experiment were as follows： FCCP （weight ratio of chitosan to fly-ash 1：6） dosage, 4 g.L^-1; temperature, 35℃; pH, 4. The stirring time and sedimentation time were 20 min and 5 h, respectively. Under these optimum conditions, the color, COD and NH3-N removal ratios were 97%, 80% and 75%, respectively.

基于ICC文件的Hi-Fi Color工业应用研究

自然界颜色的完美再现一直是印刷技术研究的主要方向,高保真印刷技术的成功应用弥补了普通CMYK四色油墨再现颜色的缺陷,是印刷企业改进印刷品质量、促进增值服务、实现差异化印刷、提高企业核心竞争力的重要技术。随着CTP技术应用的普及、色彩管理技术的不断发展和完善,基于ICC文件的高保真印刷技术变得切实可行。以下,笔者从色彩管理工艺角度探讨实现高保真印刷的前提条件、工艺流程设计、质量控制等内容。

Talent-led design endows apparel printing with new vitality

Recently, the First “Primary Color Cup” Fashion Women’s Print Design Competition Award Ceremony and New Product Launch Conference was held in Keqiao. It was sponsored by China Printing Technology Association, and jointly organized by Screenprinting & Graphic Imaging Branch of China Printing Technology Association and Shaoxing Primary Color Digital Technology Co., Ltd.

New Multi-Color Glowing Nanomaterials Enable Advanced Encryption for Enhanced Information Security

The application of photoluminescent materials in the field of information security has been attracting much attention.A number of anti-counterfeiting technologies have been developed,including watermarks,2D codes and luminescent printing.However,common fluorescent materials are single-colored and easily imitated.

基于自适应聚类和线性规划最优选点的彩色图像低成本打印方法

彩色点画是一种从视觉上由大量小像素点构建图像的艺术技术,像素个数的多少直接影响着构图的成本。其优化选点构图方法为实现低成本打印提供了一个重要的方式。目前,点画生成存在着多通道采样点难以均匀分布,颜色层次难以兼顾等难点,并耗费大量的计算成本。对此,提出了一种基于超像素自适应聚类和线性规划最优选点的彩色点画生成方法,该方法在初步超像素划分图像的基础上,使用基于颜色密度峰值的自适应聚类方法得到最佳聚类个数,并进一步划分子聚类,然后根据每个子聚类的颜色均值作为子聚类内部选点的最佳间隔距离,在选点的同时依据SSIM指标,建立目标优化模型,通过数学优化器Gurobi实现模型选点,使点保留最少个数的目标基础上,同时保持聚类内部分布均匀和颜色渐变层次,以提高所生成的点画图像的可视化效果。实验结果表明,本文算法极大地降低了像素个数并在生成的点画的平均结构相似性(mean structural similarity index measure,SSIM)、峰值信噪比(peak signal to noise ratio,PSNR)等评价指标方面均优于当前方法。

FDM全彩3D打印的色彩调控方法研究

传统熔融沉积(FDM)3D打印工艺由于材料的单一性,无法按需成型彩色模型。现有“三进一出”的FDM混色机构,由于色域空间的不同、原材料的色彩偏差及混色机构的差异性采用直接三基色混色方式导致实际打印色彩与理论色彩间存在较大偏差。针对这一问题,基于FDM三基色混色喷头,通过色域空间转换建立色彩与FDM打印工艺间的关系;通过打印实验对转换模型进行线性拟合修正,进而建立面向FDM全彩3D打印的色彩配置库,通过模型颜色与库中颜色的匹配,实现三维模型设计色彩到打印色彩的精确转换。

数字印刷系统的印刷品色序呈色差异实验分析

为了提升印刷品的印刷质量,通过实验分析的方式,分析了基于数字印刷系统的印刷品色序呈色差异,介绍了实验设计方案,并以此为基础,分析了双色、三色及基于模量控制模型的色序影响。

深色服装白墨直喷印花技术的研究

喷墨印花是具有发展潜力的新型印花技术之一,因深色服装印花困难,当前市场上深色服装常采用的喷墨印花为先丝网印白墨打底,再喷墨印花,工艺复杂,而深色服装白墨直喷印花先进技术可以代替。文中介绍了深色服装白墨直喷印花技术的应用现状和发展,阐述了白彩同出喷墨印花生产工艺流程。具体分析了印前分色原理、应用软件和性能要求,印前预处理目的、工艺处方和工艺方法,打印用白墨、彩墨的组成和物理性能指标,打印工艺类型、特点、难点和方法,印后烘干与固色工艺等,为深色服装白墨直喷印花生产提供参考方案。

Procion MX Dyes在彩色蜡染制作工艺中的应用研究

文章以彩色蜡染制作工艺为研究对象,将文献研究法与实践相结合,从画蜡技巧、上色与固色原理、艺术表现技巧等方面解读Procion MX Dyes在彩色蜡染制作工艺中的应用原则和技巧。借助Procion MX Dyes的应用,提升了彩色蜡染的艺术表现力和使用价值,为蜡染产业的发展提供了可行性参考。

可逆感温变色非织造材料的制备及性能研究

以非织造材料和感温变色油墨为原料,通过丝网印刷技术制备可逆感温变色非织造材料。测试并分析了丝网印刷前后试样微观形貌和化学结构的变化,讨论了丝网印刷次数对可逆感温变色非织造材料厚度、力学性能、变色性能和皂洗色牢度的影响。采用红蓝复合油墨对非织造材料进行整理,研究人体温度作用下可逆感温变色非织造材料的直观变色效果。结果表明:随着印刷次数的增加,整理后的非织造材料厚度、断裂强力和断裂伸长增加,初始色相加深,完全变色时间延长,皂洗色牢度GS评级提高。人体手指触摸试验结果表明,制备的非织造材料可在3 s内快速变色,具有灵敏的可逆感温变色性能。

棉织物新型涂料数码喷墨印花应用性能研究

针对传统涂料数码喷墨印花工艺中喷涂织物处理液和高温固色的环节,通过使用新型涂料数码喷墨印花工艺可省去上述环节,以达到缩短工艺流程、节能环保、减少废气排放、降本增效的目的。通过对新型涂料数码喷墨印花技术和传统涂料数码喷墨印花技术进行对比研究,将使用两种喷墨印花工艺的棉织物分别进行颜色特征值、色牢度、pH值、硬挺度、折皱回复角的测试。结果表明,新型涂料数码喷墨印花工艺在绿色节能、降低成本的同时,其耐摩擦色牢度、硬挺度和折皱回复角方面的表现优于传统涂料数码印花工艺;在颜色特征值、pH值和耐皂洗色牢度方面与传统涂料数码印花工艺性能相当。总体来说,新型涂料数码喷墨印花工艺符合绿色印染的发展方向,降低了企业生产成本,对企业实际的生产有一定的参考意义,具有广阔的应用前景和发展潜力。