The use of natural (Pinus pinaster) resin in the production of printing ink and the printability effect

Alkyd resins are generally used in the production of printing inks. All industries look for alternative raw materials in the production of ink with the growing inclination toward using natural products. Resins forming the vehicle of the ink to be obtained from natural resources will provide benefits for the environment, nature, and living creatures. The aim of the study was to promote the use of natural resin in the ink system. Natural Pinus pinaster resin was added into vegetable and mineral oil-based solvents in pure form with alkyd resin in different amounts and ink varnishes of different combinations were prepared. Then, printing inks were produced from these varnishes in pure and hybrid form. Following the assessment of the rheological properties of the inks prepared, printing tests were conducted to assess the printing quality parameters. Ideal mixing ratios of the natural resins in the ink were determined for printability. The environmental importance and advantages of the use of natural resins were discussed. Recommendations were given in line with the results to encourage widespread use of natural resins in near future.     

油墨与纸张接触的瞬间

油墨的吸收性是印刷质较短的时间尺度上分析油墨与纸张的接触过程,从而建立模型.探讨油墨吸收性对印刷质量的影响,并提出解决办法.     

3D打印再生砂浆的早期性能

研究了不同再生砂取代率对3D打印再生砂浆早期性能的影响,并通过在3D打印再生砂浆中加入不同掺量的超高分子量聚乙烯短纤维,探究了纤维掺量对再生砂浆打印性能的影响.结果表明：再生砂的掺入加速了3D打印再生砂浆早期强度的增长,50%、100%再生砂取代率的3D打印再生砂浆的湿坯强度增长速率分别是无再生砂砂浆的3.2、16.7倍;适量纤维的掺入不会影响再生砂浆早期强度的增长速率,而过多纤维的掺入将对再生砂浆早期强度的发展起负作用.     

矿物掺合料与化学外加剂对3D打印砂浆性能的影响

研究了矿物掺合料与化学外加剂对3D打印砂浆流变性能、凝结时间及打印性能的影响.结果表明:复掺矿粉与硅灰可显著改善打印砂浆的流变性能,延长打印砂浆的可操作时间,提高打印砂浆的打印性能;随着减水剂掺量的增加,打印砂浆的黏度、屈服应力及触变性均逐渐降低,凝结时间延长,减水剂掺量过低或过高均会对打印砂浆的打印性能产生不利影响;掺加适量缓凝剂可降低打印砂浆的黏度和屈服应力,改善其挤出性;随着石膏掺量的增加,打印砂浆的表观黏度、屈服应力、触变性及有效打印高度均呈现先降后增趋势,而挤出性变化规律与之相反.     

添加剂对3D打印轻骨料混凝土流变性和可打印性的影响

研究了骨料(石英砂、玻化微珠)、保塑剂(HMC)、塑化剂(KHC)、乳胶粉(FX)对3D打印轻骨料混凝土(3DPLAC)的流变性能、挤出性、堆积性能以及容重的影响.结果 表明:在相同水胶比下,随着玻化微珠取代量的增加,3D打印轻骨料混凝土的表观黏度、触变性和屈服应力明显下降,挤出性、堆积性能降低,容重显著下降;随着HMC和KHC掺量的增大,3D打印轻骨料混凝土的表观黏度、触变性、屈服应力均明显增大;随着FX掺量的增加,3D打印轻骨料混凝土的表观黏度、触变性以及屈服应力呈先减小后增大的变化趋势.通过优化各组分配比,3D打印轻骨料混凝土可获得适宜的流变性能,可打印性得到显著改善,容重明显降低.     

印刷质量与纸张表面结构之间的关系及其评价方法

介绍了纸张表面结构与低定量涂布纸的机械、光学和印刷性质之间的关系及其对印刷质量的影响。     

一种新型涂布抗水剂的制备及性能

以三聚氰胺（M）和乙二醛（G）为原料制备了一种新型的纸张涂布抗水剂。确定较佳聚合工艺为：n（G）：n（M）=3,碱性条件下反应30min,酸性缩聚1h;反应温度75℃,月（甲醇）：n（三聚氰胺）=5：1。所制备的MG抗水剂对提高纸张的抗水效果和印刷性能具有明显作用。以质量分数为2％的MG树脂溶液进行涂布时,可使纸张湿强度达到22．2％,油墨吸收率为47％,拉毛速率达到2．90m／s。但纸张的白度随着w（MG）增大略有下降。SEM显示,经改性MG处理后的纸样,细小纤维互相粘结成片后和较粗纤维贯串起来,纤维结合得更加紧密,纸张的抗水性和纸张的适印性有所提高。     

Diffusion of mineral oil in styrene‐butadiene polymer films

Mineral oil diffusion in styrene‐butadiene polymer films was investigated with a simple gravimetric sorption method. Over the selected range of temperatures and film thicknesses for which sorption tests were performed, the diffusion process is described in terms of Fick's third law. Polymer dissolution was found to compete with the diffusion process especially at high temperature. Possible interference due to dissolution on data generated using a gravimetric method, resulted in an estimation of apparent activation energy using diffusion coefficient set calculated with Crank's half‐time relationship. The mineral oil diffusion activation energy was found to be relatively high compared with those of hydrocarbons diffusing in natural and synthesized rubbers or crosslinked polybutadiene as reported in the literature. The influence of polymer T_g, crosslinking density, and polarity on mineral oil ability to penetrate polymer film was evaluated in terms of percent weight increase over time. Maximum absorption after 60‐min sorption time linearly correlates with mineral oil absorption rate for polymers prepared with different structures. This linear relationship suggests that diffusion of solvent in styrene‐butadiene polymers reveals the macroscopic composition and structural polymer modification rather than local changes. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Rheological characteristics of drug-loaded microemulsions and their printability in three dimensional printing systems

Rheological properties of microemulsions(MEs) and their printability in three dimensional printing(3DP) systems were investigated.A series of MEs with different contents of oil phase were prepared using sonication method with ibuprofen as model drug and soybean lecithin as emulfier.Stationary and transient rheological properties of MEs were investigated by ARES-SRF using concentric cylinders measuring systems.3DP systems with piezoelectric drop-on-demand print heads were employed to test the printability of the MEs.Results demonstrate that the apparent viscosity and dynamic linear viscoelastic regions of the MEs are the most important parameters for continuous and stable printing of MEs by 3DP.The incorporation of drug in the MEs has little influence on the MEs’ stationary rheological behaviors and dynamic viscoelasticity,but the concentration of oil phase has a strong influence on them.The rheological property of binder liquids has a close relationship with their printability in 3DP system.     

低定量新闻纸的印刷适性分析

结合新闻纸低定量化发展的趋势及其印刷生产的实际,通过对低定量新闻纸性能5个方面(吸墨性、平滑度、机械强度、不透明度、尺寸稳定性等)的印刷适性进行分析讨论,为低定量新闻纸的生产和印刷提供参考意见.