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如何展现印刷品的干燥特性?

印刷油墨的干燥性是指油墨附着在印刷品上形成印迹后,从液体或糊状变成固体的快慢程度。油墨经印刷后转移到纸张上,此时要求油墨墨层内的溶剂在瞬间逸出,使纸张上的油墨干燥,印刷工序才能正常进行。油墨的干燥性即油墨干燥的快慢,对印刷品质量有很大影响。若干燥过快,油墨会在印版或磨辊上糊版,结皮,使印刷品上出现墨斑;若油墨干燥过慢,印刷品则可能发生背面粘脏等现象。

The drying property of printing ink refers to the speed and degree of the change of the liquid or paste into solid after the ink is adhered to the printed matter. The ink is transferred to the paper after printing. At this time, the solvent in the ink layer is instantly escaping, so that the ink on the paper is dried, and the printing process can be carried out normally. The drying of ink, that is, the speed of ink drying, has a great influence on the quality of printed matter. Some dry too fast, the ink will be in the printing plate or grinding roll paste, skin, so that the printing ink spots; if the ink drying too slow, printed matter may occur on the back of dirt and other phenomena.

由上不难看出,油墨的干燥性是油墨的一项重要指标。那么油墨是如何干燥的呢?油墨的干燥是靠油墨中的连接料变为固体而完成的。在油墨中使用的连接料及其配方比例都是不相同的,所以油墨的干燥过程也各不相同。

It is not difficult to see that the drying of ink is an important indicator of ink. So how does ink dry? The drying of ink is accomplished by changing the binder in the ink into a solid. In the ink used in the connection and its formula proportion is not the same, so the drying process of ink is also different.

油墨主要有三种干燥方式,分别是渗透干燥,挥发干燥和氧化结膜干燥。

There are three kinds of ink drying methods, namely osmotic drying, volatile drying and oxidation of conjunctival drying.

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油墨的渗透干燥是指油墨干燥时一部分连接料渗入纸张中,另一部分连接料同颜料一起固着于纸张表面的干燥方式。这种干燥主要是依靠纸张的吸收作用和油墨的渗透作用完成的。纸张是由纤维交织形成的多孔性物质,孔径很小。当油墨转移到纸张上的时候,由于纸张纤维空隙的作用便开始吸收油墨中的连接料。在吸收过程中油墨的成分和流变特性逐渐改变,液体成分逐渐减少,颜料立体凝聚力逐渐增大,油墨逐渐失去流体性质而固化。凸版轮转墨主要依靠渗透干燥。

The osmotic drying of ink refers to the drying of some parts of the ink when the ink is dried, and the other part is connected with the pigment to fix on the surface of the paper. This drying mainly depends on the absorption of paper and the penetration of ink. Paper is a porous material interwoven with fibers with small pore size. When the ink is transferred to the paper, the paper begins to absorb the binder in the ink because of the gap of the paper fiber. In the process of absorption, the composition and rheological properties of the ink change gradually, the liquid composition gradually decreases, the three-dimensional cohesion of the pigment gradually increases, and the ink gradually loses the fluid property and solidified. Rotary letterpress ink mainly relies on infiltration drying.

挥发干燥是指油墨层干燥时连接料中的溶剂部分挥发,余下的树脂和颜料形成固体膜层,固着在纸张表面。凹版油墨和柔版油墨是典型的挥发干燥型油墨。挥发干燥的速度主要取决于溶剂的蒸发潜热,颜料的比例,颗粒的半径大小以及不同的树脂种类。

Volatile drying refers to the evaporation of the solvent in the binder when the ink layer is dried, and the remaining resin and pigment form a solid film layer, which is fixed on the surface of the paper. Gravure ink and flexographic printing ink are typical volatile drying inks. The rate of volatile drying mainly depends on the latent heat of evaporation, the proportion of pigments, the radius of particles, and the types of resins.

颜料在油墨中所占比例越大,干燥速度越慢;颜料粒子越小,则表面积越大,干燥速度越慢。凹版印刷用油墨因采用挥发性较强的溶剂为连接料,所以是以挥发性干燥为主。

The greater the proportion of pigment in the ink, the slower the drying rate; the smaller the pigment particles, the greater the surface area, the slower the drying rate. Gravure printing ink uses volatile solvent as the connecting material, so it is mainly based on volatile drying.

有了济南手提袋上面的小总结,希望对广大客户有所帮助,如果有什么不理解的或者寻求帮助的请点击我们的官方网站:http://www.sdyszb.com或者来电咨询,我们会尽全力为您解决

A small bag of Ji'nan summarized above, hope to help customers, if what you do not understand or seek help please click on our official website: http://www.sdyszb.com or contact us, we will do our best for you to solve


 
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