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BuKePrinting >> Bookprinting >> 印刷版圖文、空白部分磨損後的問題

印刷版圖文、空白部分磨損後的問題

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-09-14 | 478 Views | Share:
在錶面摩擦力的作用下,印版的圖文部分會遭到磨損。圖文部分磨損後,首先出現的弊病是,高光處發“花”,暗調處發“糊”。

印刷版圖文、空白部分磨損後的問題

在錶面摩擦力的作用下,印版的圖文部分會遭到磨損。圖文部分磨損後,首先出現的弊病是,高光處發“花”,暗調處發“糊”。


由於印版上高光處的空白部分面積,遠大於圖文部分的面積,高光處的網點基礎一旦被磨損,就很容易被周圍的潤濕液所侵占,成為親水疏油的基礎,使高光處本已極細小的網點,變得更小或丟失暗調處則相反,印版上暗調處親油的圖文面積,遠大於親水的空白面積,該處空白部分砂目一旦磨損,就會導致親水不良,極易被周圍的油墨鋪展,使網點擴大,產生“糊版”現象。


印版經過長時間的印刷,空白部分的粗化錶面也可能會逐漸被磨平,導致印版的潤濕性能降低。這樣,就必須增加潤濕液的供應量,才能維持水墨平衡。此外,還會導致印版錶面儲存的水分減少,吸附在印版錶面的膠體變少。如果印刷中途短暫停機,不及時封膠就很容易起臟,給生產帶來極大的不便,粗化錶面磨損比較嚴重的話,只好更換印版。

印刷版圖文、空白部分磨損後的問題
印刷版圖文、空白部分磨損後的問題

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