【作者】 曹进； 张伟民； 蒲嘉陵；

【Author】 CAO Jin a , ZHANG Weimin b and PU Jialing c Beijing Institute of Graphic Communication, China

【机构】 北京印刷学院印刷与包装工程学院；

【摘要】 本文主要研究了阳图型双层结构热敏成像体系及其显影性能的测试。热敏CTP版材的热敏涂层主要包括:成膜树脂,阻溶/促溶剂,红外染料等。本文设计的双层结构是在涂布热敏图层之前涂布水溶性树脂层。第一层是水溶性树脂,第二层是热敏涂层,该涂层具有很好的油墨接受性能,抗碱性能。双层结构热敏体系是在热敏涂层和水溶性树脂层能够完全粘合的基础上,尽可能的增加水溶性树脂层的厚度,减少热敏涂层的厚度,从而减少版材曝光时所需要的能量,构建了敏感度高,宽容度大,分辨力高,印刷适性好的热敏成像体系。双层结构由于热敏涂层厚度薄,水溶性物质的溶解不需要能量,所以曝光时所需要的能量较单层的少许多,透明度也大大的提高。本文考察了双层树脂层匹配,不同烤版时间和不同红外染料浓度对29G成膜树脂的碱溶性的影响以及显影时水溶性树脂对显影效果的影响。研究发现:随着烤版时间的增加,29G树脂的溶解特性在逐渐降低,其完全溶解所需要的时间越来越长;随着红外染料固含量的增加,29G树脂的溶解特性在逐渐降低,且降低的速率越来越大,其完全溶解所需要的时间越来越长。更多还原

【Abstract】 The paper mainly researches the positive bi-layered thermal imaging system and its performance of developing. Thermal CTP plate is consist of resin, inhibitational/accelerational resin, and infrared dyes and so on. The bi-layer that designed in this article refers to coat water-soluble resin layer on the thermal sensitive coatings. The first layer is water-soluble resin. The second layer is thermal sensitive layer, which has a good capacity of ink reception and resistant of alkali-soluble. This article studies on the match of two-layer resin and the effect of different baking time and different concentration infrared dyes on the alkaline solubility of the film-forming resin and the effect of water-soluble resin when developing. The result proves that with the increase of baking time, the solubility of 29G resin is decline and the soluble time becomes longer. With the increase of the content of infrared dyes, the solubility of 29G resin is decline and the rate of decline is becoming rapid and the time of completely dissolved is becoming longer.更多还原