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BuKePrinting >> Bookprinting >> 什麽是高感度樹脂印刷版材

什麽是高感度樹脂印刷版材

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-09-15 | 401 Views | Share:
什麽是高感度樹脂印刷版材

什麽是高感度樹脂印刷版材

高感度樹脂版材有以下特點。


製版工藝過程為

版材→曝光→加熱與顯影→感脂化處理→印版


其版材的構成及成像原理如下。

該版材的基本構成:是由鋁版基、氧化鋁層、感光性樹脂層PVA保護層、圖文潛像層和感脂層組成。加聚乙烯醇(PVA)保護層的目的是對版面起保護作用,並具有隔氧作用。在光敏聚合型樹脂中需添加增感染料,以增強其感光性能。光源可採用藍色激光或綠色激光(YAG)。


感光樹脂型CTP版多為陰圖型印版,將高感光度的樹脂層先塗布在版基上,再塗聚合物保護層。掃描時,激光使曝光部位的感光樹脂乳劑層中的親水性分子發生鏈接或聚合,形成不溶於水的聚合物。

而熱處理又加速了分子間的聚合反應,形成固化的聚合物即形成圖文潛像。經顯影將感光部分的保護層、未感光部分的保護層及感光樹脂層清洗掉,而固化的樹脂部分不溶於鹼性顯影液,留在版面上形成親油墨的圖文,再經過固版處理就完成了印版的製作。

這種版材的構成與PS版基本相似。由於有PVA保護層的存在,在曝光時會發生激光散射現象。所以,其分辨力不如銀鹽擴散型版材,適用於印刷中檔以下的印品,應用範圍比較廣泛。

什麽是高感度樹脂印刷版材
什麽是高感度樹脂印刷版材

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