What's the matter with ink-dragging in printing? Today, the printer will tell us what is ink-dragging in printing. Before that, we will talk about printing. Printing is the technology of transferring ink to the surface of paper, textiles, leather and other materials through plate-making, ink-applying and pressure-pressing processes, and mass-copying the content of the original manuscript.

　　简单意义上说，印刷是使用印版或其他方式将原稿上的图文信息转移到承印物上的工艺技术，也可以理解为使用模拟或数字的图像载体将呈色剂/色料（如油墨）转移到承印物上的复制过程。这就是对印刷的讲解，但在印刷过程中可能会有拖墨的现象，那么拖墨又是怎么回事呢？下面印刷厂来介绍一下拖墨是怎么回印刷过程中会出现许多的问题，例如：堆墨：油墨或其他物质沉积在墨辊或橡皮布上，形成浮雕状的沉积物，影响油墨和印迹转移。脱墨：金属墨辊受湿润液侵蚀发生氧化而排斥油墨的现象。

　　In a simple sense, printing is a process of transferring the graphic information from the original manuscript to the printer by plate or other means. It can also be understood as a reproduction process of transferring the colorant/pigment (such as ink) to the printer by using analog or digital image carriers. This is the explanation of printing, but there may be ink-dragging phenomenon in the printing process, so what about ink-dragging? Following is a brief introduction of how the ink towing process can be returned to printing. For example, ink stacking: ink or other substances deposited on ink rollers or rubber cloth, forming relief deposits, affecting ink and print transfer. Deinking: The phenomenon that metal ink rollers are oxidized by wetting solution and repel ink.

　　重影：在印刷品上同一色网点、线条或文字出现的双重轮廓。背面粘脏：印在承印物上的印刷油墨，粘在另一印张的背面，造成蹭脏。透印：印在纸张上的图文在背面可见等等。这些都是一些容易出现的问题，那么，印刷中拖墨又是怎么一回事呢？当我们采用乙酸乙酯作为胶黏剂的稀释剂时，乙酸乙酯对于常用的氯化聚丙烯油墨、聚酯油墨都是良好的溶剂，油墨部分在涂胶过程中可能发生类似于印刷中咬色故障当胶液工作浓度过低(亿酸乙酯比例大)，则在涂胶时乙酸乙酯对油墨的溶解就越厉害;另外，拖墨与胶液分裂转移时的黏性有关，胶液的黏性越大，越容易出现拖墨现象。速度慢，则胶液浸润墨层的时间长，容易导致拖墨现象。

　　Duplicate Shadows: Double contours of dots, lines or words of the same color on printed matter. Back sticky: Printing ink printed on the substrate, sticking to the back of another sheet, causing dirty rubbing. X-ray printing: The pictures and texts printed on paper can be seen on the back and so on. These are some of the problems that are easy to occur. So, what is the matter of ink-dragging in printing? When we use ethyl acetate as the diluent of the adhesive, ethyl acetate is a good solvent for common chlorinated polypropylene ink and polyester ink. The ink part may be similar to the color biting fault in printing. When the working concentration of the glue is too low (the proportion of ethyl billion), the dissolution of the ink by ethyl acetate is more severe during the gluing process. The viscosity is related to the splitting and transferring of the glue. The greater the viscosity of the glue, the easier the ink-dragging phenomenon will occur. If the speed is slow, the gel will soak the ink layer for a long time, which will easily lead to ink-drawing phenomenon.

　　这在含透明油墨的印刷膜上胶时尤其要注意。当上胶辊压力过大时或胶辊产生抖动造成局部压力过大等，就会使油墨牢牢地附着在网纹辊上,导致产生拖墨故障。胶辊表面粗糙，不光滑时为避免上胶不均常常要增大胶辊压力。油墨附着力极差，墨层可能局部被整块拉下，而且油墨会附在胶液盘里，导致胶液浑浊，变脏。油墨网辊网点边缘接触的点受到压力比较集中，而且还受到一些拉伸位移作用力，如果油墨的附着力、耐磨力不良的情况下回出现油墨被拖花现象。

　　This is especially important when gluing the printing film containing transparent ink. When the pressure of the top roller is too high or the local pressure caused by the shaking of the top roller is too high, the ink will be firmly attached to the screen roller, resulting in ink dragging failure. When the surface of COTS is rough and not smooth, it is often necessary to increase the pressure of cots in order to avoid uneven gluing. Ink adhesion is very poor, ink layer may be partially pulled down by the whole block, and ink will be attached to the glue tray, resulting in glue turbidity, dirty. The contact point of ink mesh roller dot edge is more concentrated by pressure, but also by some stretching displacement force. If the adhesion and wear resistance of ink is poor, the ink will be dragged.