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印刷制版的感光胶片的使用特点

传统印刷工艺中,出片程序必不可少,胶片在印刷中起着承上启下的作用,是印刷中不可缺少的一个环节。

In the traditional printing process, the program is indispensable, and the film plays an important role in printing. It is an indispensable link in the printing process.

那么胶片是什么样的呢?我们日常使用的各类印刷胶片,看上去就像照相底片一样,但其性能与照相底片还是有一定区别的。

So what's the film like? All kinds of printed films that we use everyday look like photographic plates, but their performance is quite different from that of photographic negatives.

我们日常接触的胶片其主要组成成分是片基,所有的涂层都涂布于透明的片基之上。其中,最重要的是感光乳剂层,感光反映主要在这一层进行。感光乳剂层内含有卤化银及增感剂,卤化银是曝光后生成影像的主要化学成分,增感剂的主要作用是促进光反应的完全化。另一个比较重要的涂层是防光晕层,这一层主要是防止曝光光线在片基层产生反射,导致感光乳剂层卤化银的二次曝光,这对保证曝光质量是非常重要的。

Our daily contact with the film is the key component of the base, all the coatings are coated on the transparent substrate. Among them, the most important is the photosensitive emulsion layer, and the photosensitive reflection is mainly carried out on this layer. The photographic emulsion contains silver halide and sensitizer. Silver halide is the main chemical constituent of the image after exposure. The main role of sensitizer is to promote the complete reaction of light. Another important coating is the anti halo layer. This layer is mainly to prevent the exposure light from reflecting on the substrate, resulting in the two exposure of silver halide in the emulsion layer, which is very important for ensuring the quality of the exposure.

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但其他涂层还有很多,妨划伤层主要是防止胶片的表面被硬物划伤,但其抗划伤的能力一般是有限的,仅仅是防止细小的粉尘对胶片表面的划伤。防氧化层是防止胶片生产后在存储期间发生化学反应。有时在胶片的最外层还有可能加上磨砂层,一般用于凹印制版。所有这些涂层都是在胶片生产时被一层一层涂布于片基上的。当然,这些涂层非常薄,以至于涂了六七层后我们看到的胶片感觉仍是片基。

But there are many other coatings, like scratch layer is to prevent the surface of the film is hard things, but the ability of anti scratch is generally limited, just to prevent the fine dust on the surface of the film scratch. The anti oxidizing layer is to prevent the chemical reaction of the film production during the storage. Sometimes the outer layer of the film may also be added to the sand layer, which is usually used for gravure printing. All of these are in the production of coating film is a layer coated on the substrate. Of course, the coating is very thin, so that the six or seven coats after we saw the film base is still feeling.

胶片为什么会感光呢?这是因为胶片上涂油感光乳剂,乳剂中分布着感光物质——卤化银。卤化银又称银盐,是卤族元素(氯,碘,溴)分别与银结合产生的化合物。银与氯结合成为溴化银,其中以溴化银的感光能力最强,而氯化银的感光能力最弱。当卤化银见光时则发生分解,因此感光胶片见光后就会曝光,经过显影,定影后生成银影像。

Why is the film sensitive? This is because the film is coated with oil and photosensitive emulsion, and the emulsion is distributed with photosensitive substance - silver halide. It is also called the silver halide, halogens (chlorine, iodine, bromine) were combined with silver produced compound. Silver and chlorine combined into silver bromide, the silver bromide photographic ability the strongest, and the weakest photosensitive silver chloride. When light occurs when the silver halide decomposition, so the film will see the light after exposure, after developing, fixing after the formation of silver image.

以上的内容您是否满意?想要查看更多的经此案内容请进入:济南印刷包装http://www.sdyszb.com 我们会有更精彩的内容为您展示。

Are you satisfied with the above content? To see more of the contents of this case, please enter: Ji'nan printed packaging http://www.sdyszb.com we will have a more wonderful content for you to show.


 
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