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印品色偏和混色故障分析!

印品色偏和混色故障大致可归纳为4个方面的原因:

  Printing color bias and color mixing failures can be roughly summarized into four reasons:

  一、制版操作不规范引起的黄、品红、青某一色印版网点过深或过浅;

  1. The dots of yellow, magenta and cyan printing plates caused by non-standard plate-making operation are too deep or too shallow.

  二、油墨色彩调配不当或三原色油墨不相匹配;

  2. Ink color mismatching or three primary color ink mismatching;

  三、印刷色序安排不合理;

  3. The arrangement of printing color sequence is unreasonable.

  四、印刷纸张本身存在较严重的色偏现象。

  Fourth, printing paper itself has a serious color bias phenomenon.

  1、印版网点深浅故障引起的色偏

  1. Color Bias Caused by the Fault of Screen Point Depth in Printing Plate

  印版晒制过程中,晒版光源强度、光谱同印版感光胶感光特性不匹配,或曝光时间不当;显影液pH值以及显影时间长短掌握不恰当等,都可能造成印版网点过深或过浅。这样的印版上机印刷,其画面色偏就不可避免了。

  In the process of plate drying, the intensity and spectrum of plate light source do not match the photosensitive characteristics of plate photosensitive adhesive, or the exposure time is inappropriate; the pH value of developing solution and the improper control of developing time may cause the screen dots to be too deep or too shallow. Such a printing plate on the computer printing, the picture color deviation can not be avoided.

  故此,印版在上机前必须先对其质量进行鉴别,对印版网点的鉴别可借助放大镜分别对照黄、品红、青、黑各色原版胶片,仔细察看相对应印版图案同一部位的亮调、中调、暗调区域网点显现情况,即亮调部位2%的小网点,印版上应能同等晒得出,印刷品上3%的网点应能印得出来。若印版上2%的小网点晒不出来,则说明印版晒浅了,不适用。用鉴别印版同胶片亮调部位2%小网点的方法,鉴别印版上同原版胶片同一部位暗调97%的网点。若印版上的这部位网点并糊,则说明这块印版晒深了;若这部位网点间空白区域面积扩大了,则说明印版晒浅了,就应重新晒制。

  Therefore, the quality of the printing plate must be identified before boarding the machine. The identification of the printing plate network can be controlled by the magnifying glass. The original film of yellow, magenta, green and black is controlled by the magnifying glass. The situation of the bright spot, middle tone and dark area of the same plate should be carefully observed. That is to say, the small dot of the bright spot is 2%, the printing plate should be able to get the same sunlight, and 3% of the printed matter is printed. It should be printed. If 2% of the small dots on the plate can not be exposed, it means that the plate is shallow and not applicable. Using the method of identifying 2% small dots on the bright spot of the plate and the film, 97% dots on the plate with the same dark spot of the original film were identified. If the dots on the plate are pasted, it means that the plate has been sunburned deeply; if the area of the blank area between dots is enlarged, it means that the plate has been sunburned shallowly, it should be re-sunned.

  当然,在有条件的情况下,采用布鲁纳尔信号条来控制晒版质量,就能准确而便于操作。鉴别方法是借助高倍放大镜,观察印版上的布鲁纳尔信号条的第5块50%的细网测试块中的各12个阴阳网点,其阴阳网点面积由大到小顺序都应各出齐6个;第6块的6个小格内2%的小网点要晒出来,若晒出的印版3%的网点存在,而2%的网点消失了,说明印版晒浅了。反之,不仅2%的网点存在,而且1%的小网点也存在,则说明印版过深。

QQ截图20170929174642.jpg

  Of course, under certain conditions, using Brunel signal bar to control the quality of printing plate can be accurate and easy to operate. The identification method is to observe 12 Yin and Yang dots in each of the fifth 50% fine screen test block of Brunel signal bar on the plate with the help of a high magnifying glass. The area of Yin and Yang dots should be 6 in order from large to small. 2% of the small dots in the six small grids of block 6 should be exposed. If 3% of the dots of the printed plate exist and 2% of the dots disappear, the printed plate is shallow. Conversely, not only 2% of the dots exist, but also 1% of the small dots exist, which means that the printing plate is too deep.

  2、油墨问题引起的色偏

  2. Color Bias Caused by Ink Problem

  印刷过程中,由油墨引起的色偏故障,多数是因为现有的各地所产的三原色油墨都存在不同程度的色偏,譬如牡丹牌05-24中黄(偏红0.16)、05~32天蓝(偏红0.35),这对整个画面都会不同程度地产生色偏影响,尤其是中间调影响更严重。但是少量的色偏可以从油墨配伍方面予以纠正。如长期以来华东地区选用的一组三原色墨,像上海油墨厂生产的05-28透明黄、05-14洋红、05-32天蓝以及天津油墨厂生产的GS-135洋红、GS-425天蓝、GS-236中黄油墨都具有快干、快固着、色彩鲜艳、色偏少、疏水性强、印刷适性好等特性,对高速、多色机用于涂料纸印刷精细产品起到了较好的作用。

  In the printing process, the color deviation fault caused by ink is mostly due to the existence of different degrees of color deviation in the three primary color inks produced in different places, such as Peony brand 05-24 medium yellow (red 0.16), 05-32 sky blue (red 0.35), which will have different degrees of color deviation impact on the whole picture, especially in the middle tone. But a small amount of color deviation can be corrected from the compatibility of ink. For example, for a long time, a group of three primary color inks used in East China, such as 05-28 transparent yellow, 05-14 magenta, 05-32 sky blue produced by Shanghai Ink Factory and GS-135 magenta, GS-425 sky blue and GS-236 yellow ink produced by Tianjin Ink Factory, all have the characteristics of fast drying, fast fixing, bright color, less color, strong hydrophobicity and good printing adaptability. They are used in high-speed and multi-color printing machine for paint paper printing essence. Fine products play a better role.

  3、色序安排引起的色偏

  3. Color Bias Caused by Colour Order Arrangement

  胶印印刷品与打样样张相比较,有时尽管所使用的油墨、纸张及实地密度相同,但印刷品仍有偏黄、偏红或偏蓝或者叠印色墨混色现象发生。

  Comparing offset prints with proofing sheets, sometimes even though the density of ink and paper used is the same as that of the sample sheets, the offset prints still have yellowish, reddish or bluish or overlay ink mixing phenomenon.

  这是什么原因呢?一是打样机一般为单色湿压干印刷,油墨吸附性、转移率较适宜;二是机器结构、压力、速度同实际印刷不尽相同;三是高速多色印刷时色序安排不合理。笔者认为色序安排顺序不合理不仅会引起色偏故障,还会使印品图案色彩因湿压湿叠印造成混色后果。

  What is the reason for this? First, the proofing machine is generally single-color wet press dry printing, the ink adsorption and transfer rate is appropriate; second, the machine structure, pressure and speed are different from the actual printing; third, the color sequence arrangement of high-speed multi-color printing is unreasonable. The author believes that the unreasonable arrangement of color sequence will not only cause color skewness failure, but also result in color mixing of printed pattern color due to wet press and overlay printing.

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