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平版印刷中出现“水干”现象是怎么回事?

来源:http://www.jindingyinshua.com   日期:2019-08-01

平版印刷过程中,所谓的'水干'是指印版的空白局部没有可以构成足够的平均水膜,即印版上的非图像局部水量缺乏。胶印印版一旦呈现水干现象,则会招致印版的空白局部挂脏,从而影响到印刷产质量量,也就是说深圳包装印刷过程中呈现了水墨均衡失控。

In lithographic printing process, the so-called'dry'means that the blank part of the plate does not have enough average water film, that is, the lack of local water on the plate. Once the offset printing plate is dry, it will cause the blank part of the plate to hang dirty, thus affecting the quality of printing output, that is to say, the ink balance is out of control in Shenzhen packaging and printing process.
胶印过程中,水墨均衡的控制与许多要素有关,包括墨量与水量的调理比例、润版液自身的质量、润版液的浓度、酒精的用量和温度、油墨自身的性质、水墨辊的压力、环境温湿度等等。
In offset printing process, the control of ink balance is related to many factors, including the proportion of ink volume to water volume, the quality of the embossing solution itself, the concentration of embossing solution, the amount and temperature of alcohol, the nature of the ink itself, the pressure of the ink roller, environmental temperature and humidity, etc.
假如印刷过程中,润版液的用量和酒精的用量是正确的话,那么呈现印版水干的缘由可能是印刷过程中供墨系统的着墨辊和供水系统的水辊压力设置不当招致的,也有可能与印刷过程中运用的润版液的质量有关。
If the amount of embossing solution and alcohol is correct in the printing process, the reason for the water drying of the printing plate may be the improper setting of the pressure of the ink-feeding roll and the water-supplying roll in the printing process, and may also be related to the quality of the embossing solution used in the printing process.
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胶印工艺过程中,需求用水润湿印版版面,水是极性分子,油是非极性分子,由于用水润湿印版,就会呈现油墨乳化现象,将油墨乳化控制在10-30%范围内,水份的聚析和蒸发速度对印迹的枯燥是有亲密关系的。由于水分子是极性很强的物质,水分的存在可以障碍油分子的氧化聚合成膜,就会影响印迹的枯燥速度,环境湿度的上下对水份蒸发速度将会起到一定作用的。环境湿度增高,空气中的氧的活动性也会削弱,降低了油墨对氧的吸人,同时油墨墨膜内层乳化的水分也使墨膜软化,从而使油墨的枯燥速度减慢。所以说在胶印过程中要控制好水墨均衡,在不脏版的前提下,运用尽量少的水分,从而减少油墨的乳化,油墨中含水量几,对印迹枯燥关系是十分亲密的。
In offset printing process, water is the polar molecule and oil is the non-polar molecule. Because water is used to wet the plate, the phenomenon of ink emulsification will appear. The emulsification of ink will be controlled within 10-30%. The speed of water accumulation and evaporation is closely related to the dullness of printing. Because water molecule is very polar material, the existence of water can hinder the oxidation and polymerization of oil molecule to form film, which will affect the drying rate of imprinting. The environmental humidity will play a certain role in the evaporation rate of water. With the increase of ambient humidity, the activity of oxygen in the air will be weakened, which reduces the oxygen absorption of ink. At the same time, the emulsified water in the inner layer of ink film also softens the ink film, thus slowing down the drying speed of the ink. So in offset printing process to control ink balance, in the premise of dirty version, the use of as little water as possible, thus reducing the emulsification of ink, ink water content a few, the dull relationship of imprinting is very close.
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