用湿复印掩蔽缩微品的划伤

用划伤的缩微品进行复印，其信息往往受到损失。但如果复印时在划伤的缩微品上涂布适当的四氯乙烯等液体，只要缩微品的乳剂层未受到损坏，便可以得到清晰度良好的硬拷贝。本文讨论了湿法复印的基本原理，并报导了试验的方法和结果。本文还讨论了其他有关湿法复印的技术问题。     

用湿法复印掩蔽缩微品的划伤

用划伤的缩微品进行复印，其信息往往受到损失。但如果复印时在划伤的缩微品上涂布适当的四氯乙烯等液体，只要缩微品的乳剂层未受到损坏，便可以得到清晰度良好的硬拷贝。本文讨论了湿法复印的基本原理，并报导了试验的方法和结果。本文还讨论了其他有关湿法复印的技术问题。     

缩微胶片划伤辨析

本文首先介绍了识别胶片划伤的技巧,然后讨论了胶片划伤的形态和类别,以及划伤在缩微品的阅读、复印和拷贝中产生的有害效应,还讨论了造成划伤原因与部位的判断方法以及划伤原因的排除方法,最后简单讨论了消除缩微胶片划伤在复印或拷贝时造成的有害效应的方法。     

缩微胶片划伤辨析

本文首先介绍了识别胶片划伤的技巧，然后讨论了胶片划伤的形态和类别，以及划伤在缩微品的阅读、复印和拷贝中产生的有害效应，还讨论了造成划伤原因与部位的判断方法以及划伤原因的排除方法，最后简单讨论了消除缩微胶片划伤在复印或拷贝时造成的有害效应的方法。     

与《一种新型胶片划痕修复液的研究》一文的作者商榷

本文对《一种新型胶片划痕修复液的研究》(发表于本刊2015年第8期)一文所阐述的电影胶片划痕修复液研制的方法设计、指标设定、试验依据等提出了改进建议,并对掩盖电影胶片划痕的三种方法 (湿法复印、数字扫描和附加修复膜)进行了比较。本文认为,用湿法数字扫描来消除胶片表面划痕对电影画面的影响是应用前景最广的技术,也是性价比最好的技术和相对最符合电影保护和保存的最可靠的技术。     

加速度传感器芯片湿法加工技术研究

本文主要研究了加速度传感器芯片的湿法加工技术,主要包括KOH腐蚀中凸角补偿图形设计,引线电极保护技术,TMAH腐蚀技术等内容。本文设计了合理的凸角补偿图形,能够制作出完整的凸角结构。本文结合实际工艺中遇到的问题,讨论了湿法加工技术中引线电极的保护方法,包括TMAH腐蚀技术的应用。制作出的加速度传感器芯片灵敏度大于0.1mV/g,非线性优于1%,横向灵敏度比小于3%。     

技术图样缩微摄影技术培训讲义(4)

本讲座讨论了技术图样缩微品的制作、拷贝和放大复印。共分为以下4部分:第1部分总论;第2部分缩微摄影与缩微胶片技术;第3部分技术图样的缩微拍摄;第4部分技术图样缩微品的拷贝与放大复印。     

体硅微机械湿法加工技术研究进展

湿法腐蚀技术成本低,是硅微机械(Micromachining)加工中最基础、最关键的技术。着重讨论了3种主要湿法技术的优缺点,概述了硅的各向同性存在侧向腐蚀、各向异性受晶格限制以及电化学腐蚀受图形尺寸限制的缺点和局限性,探讨了国内外研究现状和湿法腐蚀技术存在的问题及今后电化学腐蚀技术在湿法技术中的地位。     

技术图样缩微摄影技术培训讲义(3上)

本讲座讨论技术图样缩微品的制作、拷贝和放大复印。共分为以下4部分:第1部分总论;第2部分缩微摄影与缩微胶片技术;第3部分:技术图样的缩微拍摄;第4部分技术图样缩微品的拷贝与放大复印。     

技术图样缩微摄影技术培训讲义(2下)

本讲座讨论技术图样缩微品的制作、拷贝和放大复印。共分为以下4部分:第1部分总论;第2部分缩微摄影与缩微胶片技术;第3部分技术图样的缩微拍摄;第4部分技术图样缩微品的拷贝与放大复印。     

Characterizing the feasibility of processing wet granular materials to improve rheology for 3D printing

Rheological measurements and extrusion tests are used to evaluate the viability of high mass fraction (80% solids content) wet granular materials for extrusion-based 3D printing. Such materials have diverse applications from making dense, strong ceramic custom parts to 3D printing uniquely shaped energetic materials. Traditionally, 3D-printed colloidal materials use much lower mass fraction inks, and hence, those technologies will not work for systems requiring higher mass fraction solids content. These wet granular materials are highly non-Newtonian presenting non-homogenous flows, shear thinning, yield stress, and high elasticity. Such behaviors improve some aspects of print quality, but make printing very difficult. In this work, the relationship between the rheological behavior of wet granular materials and the processing parameters that are necessary for successfully extruding these materials for printing is examined. In the future, such characterizations will provide key indicators on how to alter printer design/operating conditions and adjust material behavior in order to improve printability. This study is a fundamental first step to successfully developing 3D printing technology of wet granular materials.     

全方位印品检测系统 PressSIGN 的应用与研究

介绍了当前科技发展形势下,国内外知名色彩管理公司的智能化印刷品质量检测系统PressSIGN 的研究及应用现状。分别从智能化生产、印刷密度控制、CTP 曲线补偿、支持多种国际印刷标准、支持干湿印刷品、自动生成颜色控制条等方面,论述了基于密度检测和色度检测的全方位印检系统PressSIGN 的关键技术,并展望了其未来发展趋势。     

3D printing with particles as feedstock materials

3D printing has been applied in numerous research fields ranging from biomedical, mechanical engineering and chemistry to material science. 3D printing applications have driven innovations in particle technology, especially through tackling particle-related issues arising from the development of particle-based printing feedstocks across such application areas. Therefore, in this review, established 3D printing processes are described to include their prototyping mechanisms, advantages and limitations. Various particulate systems, including dry and wet systems, as printing feedstock materials are introduced. The main motivation for this paper is to outline the current state of particulate feedstock systems and to attempt to outline future directions for enhancing these particle applications. This paper would be valuable for individuals, researchers and companies who need adequate and comparative information regarding the state of particle applications in the AM industry.     

白光聚合物电致发光器件及其材料的研究进展

白光聚合物电致发光器件具有低能耗、低驱动电压、绿色环保以及可制备柔性屏等诸多优异特性,被业界公认为是21世纪最具潜质和最具发展前景的高技术领域之一。此外,白光聚合物电致发光器件可通过湿法加工技术(如旋涂、丝网印刷、喷墨打印)来制作,因而其制作成本低,在显示和照明领域有着广阔的应用前景,受到人们广泛的关注。从器件和材料两个方面开展论述,简单介绍了白光聚合物电致发光的最新研究进展,并分析了实现白光聚合物电致发光器件商用化所需解决的问题。     

Flexible electroluminescent device with inkjet-printed carbon nanotube electrodes

Carbon nanotube (CNTs) inks may provide an effective route for producing flexible electronic devices by digital printing. In this paper we report on the formulation of highly concentrated aqueous CNT inks and demonstrate the fabrication of flexible electroluminescent (EL) devices by inkjet printing combined with wet coating. We also report, for the first time, on the formation of flexible EL devices in which all the electrodes are formed by inkjet printing of low-cost multi-walled carbon nanotubes (MWCNTs). Several flexible EL devices were fabricated by using different materials for the production of back and counter electrodes: ITO/MWCNT and MWCNT/MWCNT. Transparent electrodes were obtained either by coating a thin layer of the CNTs or by inkjet printing a grid which is composed of empty cells surrounded by MWCNTs. It was found that the conductivity and transparency of the electrodes are mainly controlled by the MWCNT film thickness, and that the dominant factor in the luminance intensity is the transparency of the electrode.     

先进陶瓷成形技术现状及发展趋势

先进陶瓷材料因其优异的热、电、力、光学性能,而有着广泛应用。近年来,对先进陶瓷材料性能的要求越来越高,而成形技术则是阻碍陶瓷材料进一步发展的关键问题之一。对先进陶瓷的成形方法进行了一个汇总,包含传统方法以及近年新发展起来的工艺。传统成形方法总体来说有干法成形和湿法成形两大类,干法成形主要是压制成形法;而湿法成形大致可分为塑性成形和浆料成形两类。干法成形起步较早,目前应用最广;湿法成形自动化程度高,可用于更精细的陶瓷成形。近些年,陶瓷成形技术有了较大的发展,特别是陶瓷3D打印成形技术。可以预见,3D打印成形技术将是未来发展的趋势。     

Lignin‐Based Direct Ink Printed Structural Scaffolds

3D printing of lignocellulosic biomass (cellulose, hemicellulose, and lignin) has attracted increasing attention by using this abundant, sustainable, and ecofriendly material. While cellulose can be easily tailored into a highly viscous ink for 3D printing, after solvent evaporation, the final printed structures become highly porous, fragile, and easily fall apart in water due to its hydrophilic nature. Lignin, another crucial component of natural lignocellulose, has not yet been reported for ink printing due to its unfavorable rheological behavior. Herein, a low‐cost direct ink printing strategy is developed to fabricate lignin‐based 3D structures with lignin no further refined and a more compact microstructure as well as different functionalities compared with printed cellulose. By using a soft triblock copolymer as the crosslinking agent, the rheology of lignin‐based inks can be adjusted from soft to rigid, and even enables vertical printing which requires stiff and self‐supporting features. The lignin‐based inks contain less water (≈40 wt%) and exhibit a much denser, stiffer structure, resulting in a wet tensile strength of ≈30 MPa, compared to only ≈0.6 MPa for printed cellulose. In addition, the unique macromolecular structure of lignin also demonstrates significantly improved stability in water and under heat, as well as UV‐blocking performance.     

绿色印刷及应用研究进展

目的探讨印刷的发展趋势,为绿色印刷的开发和应用提供理论依据。方法综述当前中国绿色印刷的发展状况、重要性,以及绿色印刷在包装和其他方面的应用。同时对印刷的发展前景进行展望。结论随着现代科技的发展,资源消耗不断,环境问题日益显现。人们对健康良好的生活环境给予了高度重视,绿色印刷关系着未来发展的长远利益。为了建立环境友好型社会,绿色印刷必不可少。绿色印刷是当今时代印刷发展的方向。     

凹版印刷油墨转移特性分析

在凹版印刷中,图像层次的变化,取决于墨层厚度的变化,而墨量不象其它印刷方式一样可以在印刷过程中调节,而是取决于网穴的体积和油墨的转移率。针对凹版印刷过程中影响油墨转移的主要因素,用凹版印刷适性仪进行了打样,测量了样张的墨层厚度,计算了油墨转移率,用油墨转移率定量分析了承印物的性质、油墨粘度、印刷压力、印刷速度对凹版印刷油墨转移的影响,从而探讨了凹版印刷油墨转移的规律和特性。     

印版点状弊病产生的原因及分析

印刷品上往往出现多余的不同颜色的点状弊病或缺少不同颜色的点状缺陷,这种情况不外乎是在印版上存在有多余的或缺少的点状弊病或缺陷,或是在印刷时用的承载体上有点状缺陷,或印刷时产生的点状弊病。承载体上的点状缺陷,或印刷时产生的点状弊病通常是偶尔出现的,往往是个别的、无规律的。当然在印刷时由于胶辊的因素也可能产生有规律的、批量性的点状缺陷或弊病。 印版上存在的多余或缺少的点状弊病或缺陷往往是有规律地造成一定批量的印品有同样的弊病或缺陷。本文主要就此问题进行论述。