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印刷的注意事项你知道多少?
作者:admin 来源:本站 发布时间:2018-8-1 14:20:21 浏览次数:323
一、注意观察样张
1. Pay attention to the observation of the sample
①印刷中抽样检查。进入正式印刷后不久,在开印时确定的供墨量、上水量多少会有些变化,应频繁抽样检查,进行再调整。在印刷速度保持不变,供墨量和上水量等都处于稳定的状态时,按每印500~1000张/次的比例进行抽样检查。
(1) sampling inspection in printing. Shortly after entering the formal printing, the amount of ink supply and water supply determined at the opening of the printing process will change. Frequent sampling checks and readjustments should be made. When the printing speed remains unchanged and the ink supply and water supply are in a stable state, a sample inspection is carried out according to the ratio of 500-1000 sheets per print.
②夹入警示纸条。正式印刷中,对于发生故障的地方,作为一种记号,应夹入细长的警示纸条,以方便于在后工序中进行检查。
Insert a warning note. In formal printing, the place where the fault occurred, as a mark, should be clipped into a long slip of warning paper to facilitate inspection in the subsequent process.
二、注意上水的变化
Two. Pay attention to the change of water
①注意正式印刷初期上水的变化。试印时的上水量和进入正式印刷后的上水量,多少都会有些变化,一定要一边注意观察样张有无重影、水扛子,一边注意调解印版的给水量。
1. Pay attention to the change of water in the early stage of formal printing. The amount of water in the test print and the amount of water after the official printing will be changed a little.
②注意正式印刷过程中上水的变化。要密切注意机器主体发热和车间内的通风状况给上水带来的影响,酒精润版要注意润湿系统冷却装置,控制好润湿液的温度,上水过少,会使印版起脏;上水过多将引起油墨乳化,会带来一系列问题。比如印品无光泽,纸张伸缩而套印不准,延缓油墨的干燥等。
2. Pay attention to the change of water in the process of formal printing. We should pay close attention to the effect of the heating of the machine body and the ventilation condition in the workshop to the water. It is necessary to pay attention to the cooling device of the wetting system to control the temperature of the wetting liquid, and to make the printing plate dirty; the excessive water will cause the emulsification of the ink, which will bring a series of problems. For example, glossy printing, paper expansion and printing is not allowed to delay the drying of ink.

济南书刊杂志印刷

三、注意油墨的变化

Three. Pay attention to the change of ink
①注意墨斗的油墨。墨斗的油墨从墨斗辊和墨斗刮刀之间的缝隙传出,是由油墨的自重而自然被挤压出来的。因此,墨斗中油墨量的多少,直接影响油墨的输出量。所以,要注意让墨斗中保持一定量的油墨。另外,印刷油墨具有触变性质。放置在墨斗中较久,流动性会逐渐变差,因而,要经常用墨刀在墨斗中搅拌,或者安装油墨搅拌器。
(1) pay attention to the ink of the ink. Ink from ink fountain comes from the gap between ink fountain roller and ink scraper. It is naturally extruded from the weight of the ink. Therefore, the amount of ink in ink fountain directly affects the output of ink. Therefore, we must pay attention to ink to maintain a certain amount of ink. In addition, the printing ink has the properties of thixotropy. Place in the ink bucket for a long time, the fluidity will gradually deteriorate, so often with the ink knife in the ink bucket stirring, or installation of ink mixer.
②防止油墨在机器上干燥。长时间停机如吃饭、休息时,墨辊上的油墨和墨斗中的油墨表面就会干燥。可使用干燥抑制剂喷在需要防止干燥处。
To prevent ink from drying on the machine. If you stop for a long time, if you eat or rest, the ink on the ink roller and ink will dry. Dry inhibitors can be used to prevent drying.
③注意油墨均匀,印刷品的密度视上水量、室温、机器速度不同而发生变化。应经常与标准样张进行对比检查。注意防止出现墨色不均匀现象。
3. Note that ink is uniform, and the density of printed matter varies depending on water volume, room temperature and machine speed. It should be often compared with the standard sample. Pay attention to prevent inhomogeneous ink color.
④保持润湿液的pH值,油墨中添加了辅助剂后,容易影响润湿液的pH值,如pH值增大则易造成印版起脏,因此要特别注意。
(4) keeping the pH value of the wetting liquid and adding auxiliary agent in the ink, it is easy to affect the pH value of the wetting liquid. If the pH value increases, it is easy to cause the plate to be dirty, so we should pay special attention to it.
四、注意背面蹭脏
Four, attention to the back of the dirt
背面蹭脏是由于油墨干燥缓慢、图文墨层过厚、纸张平滑度高等原因,使印张表面的油墨粘到上一张印张的背面的现象。
The back to the back of the dirty is due to the slow drying of ink, the thick layer of ink and ink, high smoothness of paper, so that the printing ink on the surface of the surface is stuck to the back of the last sheet.
以上就是关于印刷注意事项的介绍,在网站中有更多关于印刷的专业知识的介绍,希望对你有帮助!
Above is about the introduction of matters needing attention in printing, there are more professional knowledge about printing on the website, I hope to help you!