印刷中影响油墨附着力的几个要素分析

本文从油墨的特性、印刷设备性能和操作方法、承印物表面特性方面深入分析了印刷中影响油墨附着力的几个要素,提出了油墨在烟标印刷中存在的问题和解决方法以及操作使用要求,对参与烟用包装纸印刷行业的工作人员存在着学习和创新的作用.     

瓦楞纸板的应用

在不同的印刷工艺中使用同样的纸板承印物,唯一可能发生变化的就是图像质量。这些承印物在印刷机上最大的性能差别表现在承印物的种类、厚度和结构性能的不同。一、涂布材料、合成物引发的标签问题涂布与非涂布标签材料之间的性能差别很大。某纸张供应商的产品经理说:“涂布的标签材料适用于高质量的四色印刷,加网线数可超过175线;而非涂布纸张的应用范围更广,视觉效果、纹理、色彩各不相同,纸张和油墨相互作用的特性比较独特,用光滑的、涂布白纸不一定能复制出相同的效果。多数情况下,如果能够正确使用彩色非涂布纸的话,可以省去印刷机上的…     

柔性版瓦楞纸印刷的基本原理

柔性版印刷是凸版印刷工艺的一种．所谓凸版就是图部分凸起的印版。柔性版印刷基本原理是使用柔性印版，通过网纹传墨辊传递油墨，将一定厚度的油墨层均匀地涂布在印版图部分。然后在压印滚筒压力的作用下，图部分的油墨层转移到承印物的表面，形成清晰的图印刷过程。柔性版瓦楞纸板印刷机的输墨机构通常是两辊式输墨机构。     

UV塑料印刷必须考虑的四个问题

在塑料承印物表面进行UV油墨印刷或UV上光日趋流行,而且这是项具有挑战性的工作.塑料承印材料应用在印刷行业中已有几十年历史,随着UV油墨/光油的流行,在塑料承印物上进行UV油墨印刷给印刷厂和油墨厂家提出了新的课题,最大问题是如何使UV油墨/光油牢固地黏附在塑料承印物表面,即附着性问题.     

柔印技术发展前景喜人

柔印技术属于凸版印刷工艺的一种，即指有图部分凸起的印版。其印刷原理可以概括为：将流体油墨通过墨斗胶辊和网纹传墨辊传递后，使具有一定厚度的油墨层均匀地涂布在印版的图部分，再由压印滚筒施加印刷压力，将图部分的油墨层转移到承印物的表面，最后经干燥处理形成清晰的图。柔性版印刷工艺过程至此完成。     

转移印刷中离型剂膜层厚度研究

离型剂膜层的最佳厚度,可使转印油墨在转印过程中的附着力达到理想值。在室温(25℃)条件下,利用不同涂布压力和涂布速度,在PET塑料薄膜表面涂布了不同厚度及不同质量配比的离型剂,干燥后再涂布了转印油墨。针对不同实验条件下得到的涂布薄膜进行了剥离实验,结果表明:离型剂涂布速度为0.1 m/s,涂布压力为300 N,膜层厚度为9μm,质量配比为3∶1时,转印油墨的剥离效果最理想。     

可褪色环保油墨的制备工艺

目的制备环保油墨并研究该环保油墨在不同承印材料上的褪色效果。方法以蒸馏水为溶剂,超细指示剂染料为呈色物质,自制乳液为连接料,加入多种助剂制得环保油墨,研究该环保油墨在不同承印材料上的褪色效果。结果该环保油墨在不同的承印材料上采用丝网印刷工艺进行印刷,墨迹一段时间后能完全褪色。结论使用该环保油墨印刷有利于承印物的重复使用。     

导电油墨在包装防伪印刷中的应用研究

在分析影响导电油墨电阻值因素的基础上,设计了丝网印刷工艺,在不同承印物上印刷了导电油墨条码,经过测量承印物上充分干燥后的导电油墨条码的电阻值,对电阻值数据进行了分析和处理,探讨了使用导电油墨电阻值防伪的可行性。结果表明,不同网目线数的网版印刷的导电油墨条码的电阻值也不同,所以用导电油墨印制条形码,使条形码增加了一项电阻防伪功能。     

软包装材料印刷适性对印刷图像质量的影响

针对塑料软包装承印材料塑料表面致密、光洁,表面自由能相对偏低,表面张力小,不易使油墨与溶剂所浸润,研究改良塑料承印物的印刷适性对印刷品质量的影响.在实验印刷条件下,对塑料表面采用电晕处理,利用测量仪器,对不同阶调样品的表面粗糙度、印刷密度、网点扩大、印刷墨斑和油墨接触角等进行质量检测,比较测量结果.     

PECVD法制备氟碳聚合物涂层工艺参数对涂层形貌及性能影响

采用PECVD技术在铜镀金印刷电路板（PCB）表面制备了氟碳聚合物涂层,使用原子力显微镜表征了不同沉积时间和沉积平台温度下涂层的表面形貌,并通过水接触角和附着力测试对涂层性能的工艺依赖性进行了分析。结果表明,当沉积平台温度较低（50℃）和沉积时间在10-15 min时,此时涂层表面平滑,涂层的水接触角可达121°,对PCB的附着力较好。     

Sizing resin structure and interphase formation in carbon fibre composites

The single-embedded filament fragmentation test has been used to study the effect of fibre coatings on the adhesion of surface treated (oxidized) Type A and HS carbon fibres to an epoxy matrix. The presence of a sizing resin on the as-received fibres reduced the interfacial shear strength of the composite. For the unsized fibres, which were coated in the laboratory from commercial aqueous based sizing emulsions, a molecular weight dependence was observed. This suggests that compatibility of the deposited size with the matrix determines the adhesive bond between fibre and matrix and the formation of an interphasal region. On the other hand, deposition of a sizing resin from solution led to the differing conclusion that chemical interaction with the fibre surface had occurred. During composite fabrication these sizing resins will therefore have to act as ‘coupling agents’ to the matrix. Solvent extraction of emulsion-deposited sizing resins, particularly at elevated temperatures, appeared to promote their interaction with the fibre surface. The same trends in interfacial shear strength were observed in a second epoxy resin matrix of higher modulus, albeit at an increased magnitude. In this way, the plasticizing role of the ‘low’ molecular weight emulsion based size could be identified. Maximum likelihood statistics have been used to estimate the standard deviation on the value of interfacial shear strength.     

导电油墨中保护剂与银表面相互作用机理

目的研究导电油墨保护剂去除机理,为降低烧结所需能量、实现印刷电子的精准烧结提供参考依据。方法通过分子动力学(MD)方法建立导电油墨中常使用的羧酸类小分子保护剂和聚合物保护剂模型,计算保护剂与银表面的相互作用能。结果模拟计算结果表明,相互作用能大小主要与保护剂分子的相对分子质量、所含的官能团种类及其数量相关。保护剂的相对分子质量越大,与银表面之间的相互作用能绝对值越大,烧结后处理需要的能量越高;同时通过偶数碳羧酸保护剂与银表面的相互作用能拟合出线性曲线,可预测不同偶数碳链羧酸保护剂与银表面相互作用能。通过在铜版纸、聚酰亚胺(PI)薄膜2种柔性基材上进行近红外烧结实验可以明确,在导电油墨烧结过程中存在去除保护剂和致密化2个阶段,且2个阶段同步交叉进行,烧结温度越高,烧结进程越快。结论揭示了导电油墨保护剂去除机理,有助于在配制导电油墨时选择合适的保护剂,实现精准烧结,节约能源。     

涂布两种施胶剂对抄制纸板物理性能的影响

目的对涂布氧化淀粉胶纸板、聚乙烯醇胶纸板和未涂布纸板的耐破强度、戳穿强度、挺度、防水防潮性等物理性能进行研究。方法实验选用表面施胶的方法来增强纸板的物理性能。通过抄制不同定量的化学机械浆和化学浆纸板,在纸板表面涂布相同体积的氧化淀粉胶和聚乙烯醇胶,测试纸板的物理性能。结果在相同温度、相对湿度条件下涂布施胶剂的纸板,其耐破强度、戳穿强度、挺度和防水防潮性要优于未涂布纸板;涂布聚乙烯醇的纸板其耐破强度、戳穿强度和防水防潮性要优于涂布氧化淀粉胶的纸板,涂布氧化淀粉胶的纸板挺度要优于涂布聚乙烯醇胶的纸板。结论涂布施胶剂后纸板的物理性能均有所提高,涂布聚乙烯醇胶的纸板强度较强,涂布氧化淀粉胶的纸板韧性较好。     

塑料包装印刷品色彩再现规律研究

通过分析影响彩色塑料包装印刷品色彩再现的影响因素并考虑了油墨与塑料底基折射率的差异,把入射光透射到底基后的反射光光分为Fresnel反射光与漫反射光;结合油墨的吸光特性、塑料的光学性质,利用Williams-Clapper理论,用辐射传递法对各种影响因素进行分析,得出塑料包装印刷品反射率的数学模型.     

用于PE材料印刷的UV固化油墨的研制

研制了用于PE材料印刷的UV固化油墨,探讨了预聚物、活性单体、光引发剂对UV油墨的固化速度、附着力及耐溶剂性的影响,得出了油墨的最佳配方(以质量分数计)为:PUA 25%,PEA 25%,TMPTA 15%,NPGDA 15%,TPO 6%,炭黑8%,消泡剂3%,分散剂3%。按该配方配制的油墨,固化时间仅需8s,附着力等级为3级,耐溶剂性能良好,是一种适宜于PE基材印刷的UV固化油墨。     

Chemical synthesis and microstructural analysis of superconducting YBa2Cu3O7-δ ink deposited by drop-on-demand ink-jet printing on silver substrates

The basis for the development of computer controlled printing techniques for YBa₂Cu₃O_7-δ (YBCO) coated conductors is discussed in detail. This method of continuous deposition of YBCO material potentially enables non-vacuum formation of complex multi-layer superconducting patterns on silver substrates. Sol–ink processes were used to print single droplets of YBCO on polycrystalline silver substrates under varying printing conditions. Droplet sizes were controlled from a range of 300 μm–1200 μm. The formation and the stability of the sol–ink with respect to pH and concentration has been studied and discussed herein. For optimum results, the pH of the ink had to regulated to 6.5. Printing and substrate parameters that alter solid–liquid interface properties were also investigated such as ink concentration and surface roughness, the best results produced were with an ink concentration of 0.025 M on a polished silver surface. In order to control the flow properties of the sol media dynamic viscosities were determined. Characterisation by X-Ray Diffraction, Differential Thermal Analysis, Thermal Gravitometry and Scanning Electron Microscopy was used to examine the sol–ink samples, whilst AC susceptibility was used to assess the superconductivity of the printed samples where they were discovered to have a characteristic T _c of ∼83 K.     

Adhesion control of fungal spores on solid surfaces using hydrophilic nanoparticles

Mold growth can trigger a variety of serious problems such as allergies and asthma. Designing surfaces that are unfavorable for the adhesion of fungal spores is considered an effective method to prevent fungal growth. In this study, the effect of hydrophilic surface treatment on the adhesion of fungal spores onto substrates was investigated using Aspergillus oryzae as a model fungus. The fungal spores that strongly adhered on the hydrophilic substrates under atmospheric conditions were easily removed by lightly washing by hand in water. These experimental results agreed well with thermodynamic predictions based on contact angle measurements. In addition, the removal ratio of the fungal spores on substrates coated with silica nanoparticles was higher than that on plasma-treated glass. It is believed that the contact area between a spore and substrate depended on the substrate roughness. Atomic force microscopy revealed that there was almost no adhesive force between the spores and glass substrate coated with silica nanoparticles. These results suggest that hydrophilic treatment using hydrophilic silica nanoparticles is more effective than hydrophilic plasma treatment to prevent fungal spore adhesion on glass substrates.     

聚噻吩基导电油墨的制备及其印刷适性研究

聚噻吩及其衍生物具有高导电性、环保性、热稳定性等优点,将其 制备成导电油墨,在印刷电子和智能包装等领域中极具应用前景。本文以聚（3, 4- 乙撑二氧噻吩）（PEDOT）、导电炭黑（CB）以及羧甲基纤维素钠（CMC） 为主体,采用原位聚合法制备了 PEDOT-CB/CMC 导电油墨。系统地研究了 连接料、辅助添加剂及烧结温度等对油墨黏度、附着力、分散性和导电性能 的影响;并借助于丝网印刷技术对油墨的印刷适性进行了研究。结果表明, 导电油墨具备良好的分散性和附着力;印品经烧结处理后,其电阻值明显下 降并随墨条长度、宽度的增加呈现规律性变化。另外,导电油墨在纸、塑料、 棉布等不同基材上均能满足丝网印刷的要求。     

响应面法优化白墨在镭射卡纸上的附着力性能

目的为了优化UV白墨在烟包用镭射卡纸上的附着力,运用响应面实验设计方法对印刷工艺进行优化。方法以在曼罗兰印刷机上生产红双喜烟标为例,以UV灯功率、印刷车速为自变量,以白墨在镭射卡纸上的附着力为因变量,利用Design Expert软件,设计响应面图表,对2个自变量进行多次拟合,建立相应的三维曲面,得到最优的数学模型,最后得到最优的印刷工艺,并加以实验验证。结果当UV灯功率密度为120 W/cm,印刷机的印刷速度为8580张/h,能够使得白墨在镭射卡纸上有最优的附着力。结论把响应面实验设计方法来优化烟包印刷工艺,在减少实验次数的同时,对白墨在镭射卡纸上的附着力具有较好的预测效果。