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BuKePrinting >> Design >> 膠印印刷為什麽要先供水後供墨

膠印印刷為什麽要先供水後供墨

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-09-27 | 735 Views | Share:
膠印的基本原理,就在於它利用了水和油墨互相抗拒的特性既然要借助於水、油相斥的原理進行圖文轉移,那就必須提供適量的水分。

膠印印刷為什麽要先供水後供墨

膠印的基本原理,就在於它利用了水和油墨互相抗拒的特性既然要借助於水、油相斥的原理進行圖文轉移,那就必須提供適量的水分。


膠印時,為什麽要先供水後供墨?是否可以先供墨而後供水呢?


回答是,必須先供水後供墨。那種先供墨而後供水的方法,是行不通的。其原因在於以下幾個方面。


①膠印版的版面,既不同於凸印版,即版面上的圖文高出基面;又不同於凹印版,即版面上的圖文低於基面。而從大面上觀察,其圖文部分和空白部分均處在同一個平面上。


②試想,如果先使整個版面塗布油墨,這樣在壓印之後的印張上,將呈現出一片墨色,根本分不出哪是圖文部分,哪是空白部分。


③只有在印刷過程中,首先讓著水輥帶著水分滾過印版,使整個版面上都塗布以水分,這時空白部分將借助於其本身材料所具有的特點,而達到親水抗油,此後,當著墨輥向印版供墨時,空白部分將拒絕接受油墨,只有圖文部分才借助於其本身材料所具有的特點,而達到親油抗水。其結果就自然而然地形成了空白部分含水,而圖文部分含油墨,並以此在壓印後,獲得理想的圖文。


以上所述,就是先著水而後著墨的根本道理。膠印機操作者必須嚴格遵循這個規程。

膠印印刷為什麽要先供水後供墨
膠印印刷為什麽要先供水後供墨

 


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