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山东印刷包装中的颜色的巧妙处理

在平版胶印过程中,常常会碰到颜色印不实的现象,在印刷品上主要表现为印品实地部分有斑点或发虚,图文或线条残缺不全,图像的阶调层次再现性差或网点丢失.印刷过程中出现墨色不实的原因很多,其涉及的因素也很多,包括纸张的性能、油墨的性能、印版的质量、印刷橡皮布 的质量、印刷压力、印刷机的性能和印刷工艺等方面.

In the offset printing process, often encounter the phenomenon of false color printing, printing on the printing part of the field is mainly spotted or made false or incomplete text lines, image halftoning reproducibility or dot loss. There are many reasons for the ink printing process is not true, the factors involved there are many, including the performance of the paper, the performance of the ink, printing quality, printing blanket quality, printing pressure, printing machine performance and printing technology.

如果在印刷过程中,纸张、油墨的性能稳定,印版制作质量满足了印刷要求,印刷机工作性能相对稳定的话,还是出现了墨色印刷不实现象,其主要产生的原因就是印刷压力的问题了.在胶印中,印刷压力 的大小直接决定了印刷过程中油墨的转移,如果印刷过程中出现局部的压力不均,会直接导致印刷墨色的不实.

If in the printing process, stable performance of paper and ink, printing plate making quality to meet the requirements of printing, printing machine work performance is relatively stable, there is a color printing false phenomenon, the main reason is the printing pressure problem. In offset, the printing pressure depends on the size of ink transfer in the printing process, if the printing process of local uneven pressure, will lead directly to the printing ink is not real.

在胶印中,橡皮布的压缩变形是产生印刷压力的根本保证,印刷油墨的转移就是橡皮布压缩变形的结果.因此,印刷压力的大小及均匀程度与胶印印刷用的橡皮布有着直接关系.

In the offset blanket, the compression deformation is the fundamental guarantee of the printing pressure, deformation of the printing ink transfer blanket is compressed. Therefore, the printing pressure size and uniformity and used in offset printing blanket has a direct relationship.

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包覆在滚筒上的橡皮布,同时受到本身张紧力和印刷压力的作用,随着滚压次数的不断增加,橡皮布压缩变形的应力积累,橡皮布会变得硬挺,失去原有的柔软性和高弹性,甚至在橡皮布表面会出现光亮或龟裂的痕迹,从而导致印刷过程中印刷压力的局部不均匀.

Coated in the roller blanket, also influenced by tension and printing pressure, with the increase of rolling times, blanket compression deformation stress accumulation, the blanket will become stiff, loss of flexibility and high elasticity of the original, even in the blanket surface will appear bright or crack traces, which leads to the printing process local printing pressure is not uniform.

另一个方面,由于橡皮滚筒安装在印版滚筒和压印滚筒之间,橡皮布上的每个微小单元每旋转一周,都要分别和两个滚筒各接触一次.因此,其受力是周期性变化的, 正是由于橡皮布受力的周期性变化,会导致橡皮布产生内耗,导致橡皮布的老化,影响印刷压力的均匀性,可能导致橡皮布的报废.特别在现代高速胶印机上, 橡皮布受力周期的频率较高,橡皮布产生的内耗更大,橡皮布的寿命会更短,对印刷压力的影响也会越大.

On the other hand, because the rubber roller is installed between the plate cylinder and impression cylinder, each small unit on the rubber blanket per rotation, are respectively and two cylinders each contact at a time. Therefore, the force is periodic, it is because of the periodic change of blanket stress, causes the blanket of internal friction of rubber blanket, lead to aging, affect the uniformity of the printing pressure, may cause the blanket scrap. Especially in the modern high-speed printing machine, rubber blanket by high frequency cycle internal friction force, produce bigger blanket, the blanket of life will be shorter, the effect of printing pressure will be greater.

本文由山东印刷包装进行编写,想要了解更多的产品及更详细的精彩内容,请关注我们的官方网站:http://www.sdyszb.com

This article was written in Shandong printing packaging, and would like to know more about our products and more details, please pay attention to our official website: http://www.sdyszb.com


 
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