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.

由于橡皮滾筒安裝在印版滾筒和壓印滾筒之間，橡皮布上的每個微小單元每旋轉(zhuǎn)一周，都要分別和兩個滾筒各接觸一次。因此，其受力是周期性變化的， 正是由于橡皮布受力的周期性變化，會導致橡皮布產(chǎn)生內(nèi)耗，導致橡皮布的老化，影響印刷壓力的均勻性，終可能導致橡皮布的報廢。山東印刷廠特別在現(xiàn)代高速膠印機上， 橡皮布受力周期的頻率較高，橡皮布產(chǎn)生的內(nèi)耗更大，橡皮布的壽命會更短，對印刷壓力的影響也會越大。

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

在圖像由RGB色彩模式轉(zhuǎn)為CMYK色彩模式時，圖像上的一些鮮艷的顏色會產(chǎn)生明顯的變化，這種變化有時很明顯地能觀察得到，一般會由鮮艷的顏色變成較暗一些的顏色。這是因為RGB的色域比CMYK的色域大，也就是說有些在RGB色彩模式下能夠表示的顏色在轉(zhuǎn)為CMYK后，山東印刷廠就超出了CMYK能表達的顏色范圍，這些顏色只能用相近的顏色替代。因而這些顏色產(chǎn)生了較為明顯的變化。在制作用于印刷的電子文件時，在線設計印刷平臺印客聯(lián)盟網(wǎng)建議初的文件設置即為CMYK模式，避免使用RGB顏色模式，以免在分色轉(zhuǎn)換時造成顏色偏差。

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.