• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Circuitree >Controlling Size-Change of Phototooling Films
【24h】

Controlling Size-Change of Phototooling Films

机译：控制照相胶片的尺寸变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Having a good understanding of phototooling film characteristics can make the difference between using the materials easily and always fighting problems. In the manufacture of multi-layer PCBs there are many causes of layer-to-layer mis-registration. One of the more common problems is phototools that are not the correct size. Although this is a common problem, most people don't understand the factors that contribute to the problem or how to control them. The key to understanding these issues is to understand what causes the films to change size and how the films respond to changes in these factors. For PCB artwork reproduction we typically use either silver halide or diazo films to produce the phototool. These films are composed of a 7-mil (178 μm) thick polyester substrate with one or more coated layers. As the polyester substrate makes up 90-95% of the total mass of the films, the reaction of these films to changes in the environment is dominated by the properties of the polyester. The coated layers on the diazo film use an acrylic binder, which doesn't alter the film's response significantly. Silver halide films have coatings made of gelatin or polymer-substituted gelatin. The gelatin absorbs more water than polyester does and causes the film to respond more strongly to changes in humidity.
机译：对照相胶片的特性有很好的了解可以使轻松使用材料与始终解决问题之间有所不同。在多层PCB的制造中，层错对准的原因很多。较常见的问题之一是尺寸不正确的照相工具。尽管这是一个常见问题，但大多数人不了解导致该问题的因素或如何控制它们。理解这些问题的关键是要了解导致胶片尺寸改变的原因以及胶片如何响应这些因素的变化。对于PCB艺术品的复制，我们通常使用卤化银或重氮胶片来生产照相工具。这些薄膜由具有一个或多个涂层的7密耳（178μm）厚的聚酯基材组成。由于聚酯基材占薄膜总质量的90-95％，因此这些薄膜对环境变化的反应主要由聚酯的性能决定。重氮膜上的涂层使用丙烯酸粘合剂，不会明显改变膜的响应。卤化银膜具有由明胶或聚合物取代的明胶制成的涂层。明胶比聚酯吸收更多的水，并使薄膜对湿度的变化反应更强烈。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号