在包装印刷行业，覆膜的效果不仅与覆膜的原材料和操作方法有关，更重要的是与被胶印刷品的墨层状况有关。印刷品的墨层状况主要由纸张的性质、油墨性能、墨层厚度、印刷图文的图形面积和整体密度等决定。下面
济南彩色设计印刷厂家为您讲解：
In the packaging and printing industry, the effect of film covering is not only related to the raw materials and operation methods of film covering, but also to the ink layer of the offset brush. The ink layer condition of printed matter is mainly determined by the paper property, ink performance, ink layer thickness, graphic area and overall density of printed images and texts. Next, Jinan Color Design and Printing Factory will explain to you:
1.印刷品的墨层厚度。
1. The ink layer thickness of the printed matter.
墨层厚的实地印刷品往往难以与塑料薄膜粘合，很快就会脱层起泡。这是因为较厚的油墨层改变了纸张的多孔表面特性，使纸张的纤维孔隙封闭，严重阻碍了粘合剂的渗透和扩散。粘合剂一定程度的渗透有利于涂膜的粘合。
Field prints with thick ink layer are often difficult to bond with plastic film, and will soon delaminate and blister. This is because the thicker ink layer changes the porous surface characteristics of the paper, closes the fiber pores of the paper, and seriously hinders the penetration and diffusion of the adhesive. A certain degree of penetration of the adhesive is conducive to the adhesion of the coating film.
油墨层的厚度也与印刷方法直接相关，不同的印刷方法油墨层的厚度也不同。比如平印产品的墨层厚度在L——2μm左右，凸版印刷的墨层厚度在2——5μm左右，凹印的墨层厚度可以达到10μm，从覆膜的角度来看，平印的印刷品比较理想，其墨层很薄。
The thickness of the ink layer is also directly related to the printing method, and the thickness of the ink layer varies with different printing methods. For example, the ink layer thickness of lithographic products is L-2 μ About m, the ink layer thickness of letterpress printing is 2-5 μ About m, the ink layer thickness of gravure printing can reach 10 μ m. From the perspective of film covering, lithographic printing is ideal, and its ink layer is very thin.
2.印刷油墨的种类。
2. Type of printing ink.
被覆膜的印刷品应采用快固型光亮胶印油墨，这种油墨的连结料由合成树脂、干植物油、高沸煤油和少量树胶组成。合成树脂分子中含有极性基团，易与粘合剂分子中的极性基团扩散渗透，交联形成物理和化学结合力，有利于覆膜；快速固色这种浅色胶印油墨还有一个好处就是印刷后结膜干燥快，对覆膜也非常有利。但使用时不宜加入过多催干剂，否则油墨层表面会结晶，反而影响覆膜效果。
The film-coated printed matter shall use quick-setting bright offset printing ink, which is composed of synthetic resin, dry vegetable oil, high-boiling kerosene and a small amount of gum. The synthetic resin molecules contain polar groups, which are easy to diffuse and penetrate with the polar groups in the adhesive molecules, and cross-link to form physical and chemical binding force, which is conducive to film covering; Another advantage of this light-color offset printing ink is that the conjunctiva dries quickly after printing, which is also very beneficial to film covering. However, it is not advisable to add too much drying agent when using, otherwise the surface of the ink layer will crystallize, which will affect the film covering effect.
3.油墨稀释剂的使用。
3. Use of ink thinner.
油墨稀释剂是一种能使油墨颜色变浅的物质。印刷前应仔细选择自墨，尽量使用均匀细腻、无明显颗粒的自墨作为稀释剂。
Ink thinner is a substance that can make ink color lighter. Before printing, the self-ink should be carefully selected. Try to use the self-ink that is even, fine and free of obvious particles as the diluent.
4.添加粉末喷涂。
4. Add powder spraying.
为了适应多色高速印刷，胶印中常采用喷粉技术来解决脏背问题。喷雾粉大多由谷物淀粉和天然悬浮物组成。喷粉的防粘作用主要是在墨层表面形成不可逆的垫层，从而降低附着力。由于颗粒较粗，如果在印刷过程中喷粉过多，这些颗粒就会漂浮在印刷品表面。覆膜时，粘合剂不会处处与油墨层粘合，而是与这层喷粉粘合，从而造成假贴，严重影响覆膜质量。因此，如果印刷产品需要涂层，印刷时应尽量控制喷粉量。
In order to adapt to multi-color high-speed printing, powder spraying technology is often used in offset printing to solve the problem of dirty back. Spray powder is mostly composed of cereal starch and natural suspended solids. The anti-sticking effect of powder spraying is mainly to form an irreversible cushion on the surface of the ink layer, thus reducing the adhesion. Due to the coarse particles, if too much powder is sprayed during the printing process, these particles will float on the surface of the printed matter. When laminating, the adhesive will not bond with the ink layer everywhere, but with this layer of powder spraying, resulting in false pasting and seriously affecting the quality of laminating. Therefore, if the printed product needs coating, the amount of powder spraying should be controlled as much as possible during printing.
5.印刷品表面内层的干燥情况。
5. The drying of the inner layer of the printed matter surface.
印刷品的油墨层干燥不良对涂布膜的质量危害很大。除了油墨的种类、印刷过程中催干剂的用量和种类以及印刷和储存间的环境温湿度外，纸张本身的结构也很重要。如果铜版纸和胶版纸的结构不同，墨层的干燥条件也不同。
The poor drying of the ink layer of the printed matter is very harmful to the quality of the coating film. In addition to the type of ink, the amount and type of drying agent in the printing process, and the ambient temperature and humidity in the printing and storage room, the structure of the paper itself is also very important. If the structure of coated paper and offset paper is different, the drying conditions of the ink layer are also different.
无论是铜版纸还是胶版纸，在油墨没有完全干燥的情况下，对铜版纸的质量都是不利的。油墨中含有的高沸点溶剂很容易使塑料薄膜膨胀伸长，塑料薄膜的膨胀伸长是涂布后产品起泡、分层的主要原因。
Whether it is coated paper or offset paper, if the ink is not completely dry, it is unfavorable to the quality of coated paper. The high boiling point solvent contained in the ink can easily make the plastic film expand and elongate. The expansion and elongation of the plastic film is the main reason for the blistering and delamination of the coated product.
In a word, these factors affect the formation conditions of adhesive mechanical adhesion, physical and chemical adhesion, and thus cause changes in the surface adhesion of printed matter. For more matters related to printing design, please visit our website https://www.sdhzyw.com Ask!
