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印刷中印版發虛產生的原因

From:Buke printing factory of China步殼印刷 | Author:China Bukeprinting factorybook0755 | Published time: 2020-07-22 | 914 Views | Share:
在實際印刷中,印版圖形文字的不足主要是由於製版手法造成的,原因很多。步殼印刷根據其原因,可分為以下幾類:
印刷中印版發虛產生的原因

  在實際印刷中,印版圖形文字的不足主要是由於製版手法造成的,原因很多。步殼印刷根據其原因,可分為以下幾類:

  1.污垢造成的假版本

  原因:1印刷機玻璃、印版膜、印版底座、印版版面附著異物或污垢;(2)印片與印版底座之間、印版與薄膜與異物(如發絲等)混和;(3)印版時間過長,平板玻璃、製版膠片產生靜電,在印刷過程中產生灰塵等;4PS印版錶面有藥物斑點、白點等缺陷。

  2.印刷膠片引起的虛擬版

  原因:1膠片密度不夠(應在3.5以上);(2)底片底面霧過高;(3)膠捲圓板拼貼不當,外緣過窄(應留3cm以上),版面過於擁擠(0.5~1mm),造成拱形碰撞等4)透明膠帶間隔圖像鈦金(應留7mm以上)或粘貼過厚;5打印膠片背面。

  3.真空泵不足造成的虛擬版本

  原因:1真空泵能量差;2印刷機密封圍裙、氣管泄漏;3密封橡膠環老化變形;4太陽板機橡膠墊無墊或老化;5真空排氣指示器表有問題,指示頭部但實際不牢固;6膜或PS版時有摺痕等7時發現牛頓環、大空氣滯留區、粉塵雜物等,以便及時進行二次抽水。

  4.過度暴露和開發造成的虛擬版本

  原因如下:(1)曝光時間過長;(2)曝光前(沖壓)或顯影前(暴露前);(3)顯影液溫度過高,濃度過大;(4)顯影時間過長;(5)顯影液的加入量過大。

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