If in the printing process, the performance of paper and ink is stable, the plate production quality meets the printing requirements, and the working performance of the printing machine is relatively stable, the ink printing is still not true, and the main reason is the printing pressure. In offset printing, the printing pressure directly determines the transfer of ink in the printing process. If the local pressure is uneven in the printing process, it will directly lead to the printing ink color.

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，终可能导致橡皮布的报废。山东印刷厂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。

Since the rubber drum is installed between the plate cylinder and the imprint cylinder, each tiny unit on the blanket has to contact with the two rollers once every rotation. Therefore, the force changes periodically. It is precisely because of the periodic change of blanket stress that will lead to internal friction of blanket, lead to the aging of blanket, affect the uniformity of printing pressure, and eventually lead to the scrap of blanket. Shandong printing factory, especially in the modern high-speed offset press, the frequency of rubber cloth stress cycle is higher, the internal friction produced by blanket is greater, the life of blanket will be shorter, and the impact on printing pressure will be greater.

Jinan printing factory

在图像由RGB色彩模式转为CMYK色彩模式时，图像上的一些鲜艳的颜色会产生明显的变化，这种变化有时很明显地能观察得到，一般会由鲜艳的颜色变成较暗一些的颜色。这是因为RGB的色域比CMYK的色域大，也就是说有些在RGB色彩模式下能够表示的颜色在转为CMYK后，山东印刷厂就超出了CMYK能表达的颜色范围，这些颜色只能用相近的颜色替代。因而这些颜色产生了较为明显的变化。在制作用于印刷的电子文件时，在线设计印刷平台印客联盟网建议初的文件设置即为CMYK模式，避免使用RGB颜色模式，以免在分色转换时造成颜色偏差。

When the image changes from RGB color mode to CMYK color mode, some bright colors on the image will have obvious changes, which can be observed sometimes. Generally, the bright colors will change into darker colors. This is because the gamut of RGB is larger than that of CMYK. That is to say, after some colors that can be expressed in RGB color mode are converted to CMYK, Shandong printing factory has exceeded the color range that CMYK can express, and these colors can only be replaced by similar colors. Therefore, these colors have a more obvious change. In the production of electronic documents for printing, the online design and printing platform printer alliance network suggests that the initial document setting is CMYK mode, avoiding the use of RGB color mode, so as to avoid color deviation during color separation and conversion.