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  • 色序印刷的方法介绍
  • 本站编辑:杭州诗欣纸制品印刷有限公司发布日期:2019-12-10 19:46 浏览次数:

在彩色印刷中,合理安排色序的印刷顺序是技术人员的一项重要课题,色序安排不当有可能导致印刷品产生色偏、混色和逆套印等故障。下面就给大家说下色序原则吧。

  1.根据原稿内容和特点安排色序。印刷是表现版面图文设计的一个手段,而且,各个色彩体现的感情成分也不同。因此色序的安排必须考虑原稿内容和特点。编辑在设计图文版式时,往往已选择好版面色彩的基调。这个基调就是代表整个色调的总体感觉,成为印刷时支配性的颜色。从色性而言,以红、橙、黄为基调的称为暖色调;以绿、蓝为基调的称为冷色调。由于油墨具有遮盖力的原因,一般以暖调为主的先印黑、青,后印品红、黄;以冷调为主的先印品红,后印青色。画面色彩气氛需要加强的颜色,可以放在比较后一色印刷。

  2.考虑纸张性质安排色序。质量差的纸张,考虑其白度、平滑度低,纤维松散,吸墨性差,易掉粉掉毛,可以先印黄墨打底,以弥补纸张的上述缺陷。在夜间印刷时,由于人眼的辨认力原因,明度低的弱色墨不宜安排在靠前色印刷。油墨的明度顺序分别是:白<黄<橙<绿<青<红<蓝<紫。

  3.按油墨的透明度来安排色序。透明度好的油墨,两色相叠印后,下面墨层的色光能透过上面的墨层,达到较好的减色混合,显示出正确的新色彩。如果所用黄墨是透明黄,四种油墨透明度顺序是:黄>品红>青>黑。一般来讲,透明度差的油墨先印,透明度好的油墨后印。

  4.从利于套印来安排色序。由于纸张变形伸缩等客观存在的缺陷,我们可以把套印要求比较高的印品的主要颜色安排在相邻两个色组印刷。如双色机,可安排在同一机组一次印刷完成,避免由于纸张存在引起的纸张伸缩等问题。大面积的实地,可以安排后印,避免在纸张交接过程中产生蹭脏等问题。另外,单色机是在靠前色“干”后再叠印第二色,而多色机是“湿压湿”的过程,因此应控制好油墨的粘度和下墨量。即安排粘度大的油墨先印,粘度小的油墨后印,这是至关重要的,否则会造成逆套印的弊病。

  5. 考虑制版等工序因素。在印刷时相邻两色组的网线角度相差至少30°,有利于防止色偏和龟纹等弊病。

  6.根据成本考虑色序排列。便宜的黑、青墨先印,价格高的品红、黄墨后印。

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In Color Printing, it is an important task for technicians to arrange the printing sequence reasonably. Improper arrangement of color sequence may lead to color deviation, color mixing and reverse overprinting. Let's talk about the color sequence principle. 1. Arrange the colors according to the content and characteristics of the original manuscript. Printing is a means of expressing the layout of graphic design, but also, each color reflects the emotional component is different. Therefore, the arrangement of color sequence must first consider the content and characteristics of the original manuscript. Editors in the design of graphic format, often have chosen a good layout color tone. This tone represents the overall feeling of the whole tone, becoming the dominant color in printing. In terms of color, red, orange, yellow as the tone is called warm; green, blue as the tone is called cold. As a result of the covering power of the ink, generally to warm the main black, green, after printing Magenta, yellow; to cool the main first printing Magenta red, after printing Cyan. The color atmosphere of the picture needs to be enhanced by the color that can be placed on the last color printed. 2. Consider the nature of the paper to arrange the color sequence. Poor quality paper, consider its whiteness, smoothness, fiber loose, poor ink absorption, easy to fall off the yellow ink to make up for the defects of the paper. When printing at night, due to the human eye, low brightness of the weak-color ink should not be arranged in the first color printing. The lightness order of ink is: White & LT; Yellow & Lt; Orange & Lt; Green & Lt; Green & Lt; Red & Lt; Blue & Lt; Purple. 3. Arrange the colors according to the transparency of the ink. Transparent good ink, two-color phase overprint, the lower layer of light through the ink layer above, to achieve a better subtractive mixing, showing the right new color. If the yellow ink used is transparent yellow, the Transparency Order of the four inks is: Yellow & GT; Magenta & GT; Cyan & GT; Black. In general, the transparency of the ink first printing, good transparency of the ink after printing. 4. Color Order from the advantage of overprinter. Due to the deformation of the paper and other objective defects, we can overprint requirements of the main color printing in two adjacent color group printing. Such as two-color machine, can be arranged in the same unit to complete a printing, to avoid the paper due to the existence of the paper, such as stretching problems. Large area of the field, can be arranged after the printing, to avoid the transfer of paper in the process of rubbing dirty and other problems. In addition, monochrome machine is in the first color after overprinting the second color, and multi-color machine is wet pressing process, so you should control the ink viscosity and the amount of ink. That is, the arrangement of viscidity large ink first printing, viscidity small ink after printing, which is crucial, otherwise it will cause reverse overprinter. 5. Consider the process factors such as platemaking. When Printing, the angle difference between two adjacent color groups is at least 30, which helps to prevent color deviation and Moire and other defects. 6. Consider color order according to cost. Cheap black, blue ink first printing, HIGH-PRICED MAGENTA, yellow ink after printing.