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.

　　簡單意義上說，印刷是使用印版或其他方式將原稿上的圖文信息轉移到承印物上的工藝技術，也可以理解為使用模擬或數字的圖像載體將呈色劑/色料（如油墨）轉移到承印物上的復制過程。這就是對印刷的講解，但在印刷過程中可能會有拖墨的現象，那么拖墨又是怎么回事呢？下面印刷廠來介紹一下拖墨是怎么回印刷過程中會出現許多的問題，例如：堆墨：油墨或其他物質沉積在墨輥或橡皮布上，形成浮雕狀的沉積物，影響油墨和印跡轉移。脫墨：金屬墨輥受濕潤液侵蝕發生氧化而排斥油墨的現象。

　　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：在印刷品上同一色網點、線條或文字出現的雙重輪廓。背面粘臟：印在承印物上的印刷油墨，粘在另一印張的背面，造成蹭臟。透印：印在紙張上的圖文在背面可見等等。這些都是一些容易出現的問題，那么，印刷中拖墨又是怎么一回事呢？當我們采用乙酸乙酯作為膠黏劑的稀釋劑時，乙酸乙酯對于常用的氯化聚丙烯油墨、聚酯油墨都是良好的溶劑，油墨部分在涂膠過程中可能發生類似于印刷中咬色故障當膠液工作濃度過低(億酸乙酯比例大)，則在涂膠時乙酸乙酯對油墨的溶解就越厲害;另外，拖墨與膠液分裂轉移時的黏性有關，膠液的黏性越大，越容易出現拖墨現象。速度慢，則膠液浸潤墨層的時間長，容易導致拖墨現象。

　　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.

　　這在含透明油墨的印刷膜上膠時尤其要注意。當上膠輥壓力過大時或膠輥產生抖動造成局部壓力過大等，就會使油墨牢牢地附著在網紋輥上,導致產生拖墨故障。膠輥表面粗糙，不光滑時為避免上膠不均常常要增大膠輥壓力。油墨附著力極差，墨層可能局部被整塊拉下，而且油墨會附在膠液盤里，導致膠液渾濁，變臟。油墨網輥網點邊緣接觸的點受到壓力比較集中，而且還受到一些拉伸位移作用力，如果油墨的附著力、耐磨力不良的情況下回出現油墨被拖花現象。

　　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.