丝网印刷时的常见问题及解决方法
<font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 丝网印刷的生产过程包含了多个环节和步骤。这些环节和步骤中如果稍不留意就会产生一系列的问题，带来一连串的麻烦。例如：<br style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; margin: 0px; padding: 0px; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"><font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 网版涂感光胶后为什么一定要彻底干透？<br style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; margin: 0px; padding: 0px; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"><font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 因为若感光胶层内稍带有水气，则水气会在曝光时对光产生折射，从而影响到感光胶的交联度。另外感光胶未彻底干燥 也会阻碍交联，从而导致网版曝光后显影时出现针孔、脱胶及胶层与丝网附着力下降、耐印次数减少等弊病，因此，曝光前的感光层干燥程度至关重要。<br style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; margin: 0px; padding: 0px; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"><font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 然后关于丝网的颜色，丝网的颜色多种多样，主要有白、黄、琥珀色、红色等，其中以黄色丝网为佳。对于特别精致的印刷品，我们常用进口黄色丝网。<br style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; margin: 0px; padding: 0px; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"><font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 为什么要用黄色丝网呢？我们知道，自然界绚丽夺目的色彩均是由于光的作用，没有光就没有色，光的颜色是由光波的频率决定的。红、橙、黄、绿、青、篮、紫色是人们视觉神经可以感受到的光，称为可见光。物体表面对光的选择性吸收和反射而得到不同的颜色，简言之，我们能看到的任何色彩就是光的颜色。即当一束光线照射到黄色物体表面时，只有黄色光被反射，刺激我们的视觉神经而呈色，而其它色光均被吸收，所以我们看到物体的颜色是黄色的。<br style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; margin: 0px; padding: 0px; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"><font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 由于网版印刷在晒版曝光时，采用的是紫外光线，紫色光是由颜色中的青和品红两种色相的混合反射光，也就是说在黑色中缺少黄色色相。在曝光时，紫色加丝网的黄色就叠加成黑色，所以黄色丝网的表面（即乳剂层的底部）不感光或少曝光，因此不会出现“背晒”现象，得到的图像清晰度高，不会产生晕影。<br style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; margin: 0px; padding: 0px; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"><font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 将配制好的感光液放入不锈钢槽中，感光液约占槽的一半左右。涂布槽与倾斜的丝网下端接触，一边使槽倾斜流出感光液，一边缓慢而又均匀地把槽往上提沿着丝网面进行涂布。涂布速度不能过快，过快会引起感光乳剂起泡，膜面就会产生针孔；过慢会引起感光乳剂涂布不匀。为了获得最佳涂布效果，最好先从印刷时与承印物接触的那一面进行涂布，涂布面积应比丝网框稍小一些，然后将网版上下颠倒再涂布一次，最后对网版反面涂布后进行干燥，以便使感光乳剂塞满网孔。用 30~35℃的热风干燥为最佳，这样可以缩短干燥时间。如果温度较高，超过40℃时，网版则会产生热灰雾现象。<br style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; margin: 0px; padding: 0px; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"><font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 晒版前，应先检查软片感光股面和晒版台的玻璃面上是否有脏活或灰尘，最好先用棉纱蘸酒精擦拭清洁后再进行工作。有卤化银附着的软片表面为正面，片基特有光泽的一面为反面。晒版时，应将软片的药膜面和网版的乳剂面密实贴合，留出咬口线进行曝光。曝光时间应根据感光刺的种类、感光膜的涂布厚度、阳图片的黑实程度及印刷要求而定。著感光膜的涂布层愈厚，则需要的曝光时间就相应长一些，以便版膜彻底固化。若阳图片上的图文黑实程度不够，即发灰而不黑，则应缩短曝光时间，相应地延长显影时间，以便使未感光的图文部分完全通透。<br style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; margin: 0px; padding: 0px; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"><font color="#000000" style="font: 14px/25px "WenQuanYi Micro Hei Mono", "WenQuanYi Micro Hei", "Microsoft Yahei Mono", "Microsoft Yahei", sans-serif; text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; float: none; display: inline !important; white-space: normal; widows: 1; font-size-adjust: none; font-stretch: normal; webkit-text-stroke-width: 0px;"> 如果把握好了丝网印刷中各种问题及解决方法，企业的产品质量、生产效率以及企业的声誉都将有所提高，同时成本也将得到有效的控制。
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