絲網(wǎng)印刷時(shí)的常見問題及解決方法
<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;"> 絲網(wǎng)印刷的生產(chǎn)過程包含了多個(gè)環(huán)節(jié)和步驟。這些環(huán)節(jié)和步驟中如果稍不留意就會(huì)產(chǎn)生一系列的問題，帶來一連串的麻煩。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;"> 網(wǎng)版涂感光膠后為什么一定要徹底干透？<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?yàn)槿舾泄饽z層內(nèi)稍帶有水氣，則水氣會(huì)在曝光時(shí)對(duì)光產(chǎn)生折射，從而影響到感光膠的交聯(lián)度。另外感光膠未徹底干燥 也會(huì)阻礙交聯(lián)，從而導(dǎo)致網(wǎng)版曝光后顯影時(shí)出現(xiàn)針孔、脫膠及膠層與絲網(wǎng)附著力下降、耐印次數(shù)減少等弊病，因此，曝光前的感光層干燥程度至關(guān)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;"> 然后關(guān)于絲網(wǎng)的顏色，絲網(wǎng)的顏色多種多樣，主要有白、黃、琥珀色、紅色等，其中以黃色絲網(wǎng)為佳。對(duì)于特別精致的印刷品，我們常用進(jìn)口黃色絲網(wǎng)。<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;"> 為什么要用黃色絲網(wǎng)呢？我們知道，自然界絢麗奪目的色彩均是由于光的作用，沒有光就沒有色，光的顏色是由光波的頻率決定的。紅、橙、黃、綠、青、籃、紫色是人們視覺神經(jīng)可以感受到的光，稱為可見光。物體表面對(duì)光的選擇性吸收和反射而得到不同的顏色，簡(jiǎn)言之，我們能看到的任何色彩就是光的顏色。即當(dāng)一束光線照射到黃色物體表面時(shí)，只有黃色光被反射，刺激我們的視覺神經(jīng)而呈色，而其它色光均被吸收，所以我們看到物體的顏色是黃色的。<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;"> 由于網(wǎng)版印刷在曬版曝光時(shí)，采用的是紫外光線，紫色光是由顏色中的青和品紅兩種色相的混合反射光，也就是說在黑色中缺少黃色色相。在曝光時(shí)，紫色加絲網(wǎng)的黃色就疊加成黑色，所以黃色絲網(wǎng)的表面（即乳劑層的底部）不感光或少曝光，因此不會(huì)出現(xiàn)“背曬”現(xiàn)象，得到的圖像清晰度高，不會(huì)產(chǎn)生暈影。<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;"> 將配制好的感光液放入不銹鋼槽中，感光液約占槽的一半左右。涂布槽與傾斜的絲網(wǎng)下端接觸，一邊使槽傾斜流出感光液，一邊緩慢而又均勻地把槽往上提沿著絲網(wǎng)面進(jìn)行涂布。涂布速度不能過快，過快會(huì)引起感光乳劑起泡，膜面就會(huì)產(chǎn)生針孔；過慢會(huì)引起感光乳劑涂布不勻。為了獲得最佳涂布效果，最好先從印刷時(shí)與承印物接觸的那一面進(jìn)行涂布，涂布面積應(yīng)比絲網(wǎng)框稍小一些，然后將網(wǎng)版上下顛倒再涂布一次，最后對(duì)網(wǎng)版反面涂布后進(jìn)行干燥，以便使感光乳劑塞滿網(wǎng)孔。用 30~35℃的熱風(fēng)干燥為最佳，這樣可以縮短干燥時(shí)間。如果溫度較高，超過40℃時(shí)，網(wǎng)版則會(huì)產(chǎn)生熱灰霧現(xiàn)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;"> 曬版前，應(yīng)先檢查軟片感光股面和曬版臺(tái)的玻璃面上是否有臟活或灰塵，最好先用棉紗蘸酒精擦拭清潔后再進(jìn)行工作。有鹵化銀附著的軟片表面為正面，片基特有光澤的一面為反面。曬版時(shí)，應(yīng)將軟片的藥膜面和網(wǎng)版的乳劑面密實(shí)貼合，留出咬口線進(jìn)行曝光。曝光時(shí)間應(yīng)根據(jù)感光刺的種類、感光膜的涂布厚度、陽圖片的黑實(shí)程度及印刷要求而定。著感光膜的涂布層愈厚，則需要的曝光時(shí)間就相應(yīng)長一些，以便版膜徹底固化。若陽圖片上的圖文黑實(shí)程度不夠，即發(fā)灰而不黑，則應(yīng)縮短曝光時(shí)間，相應(yīng)地延長顯影時(shí)間，以便使未感光的圖文部分完全通透。<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;"> 如果把握好了絲網(wǎng)印刷中各種問題及解決方法，企業(yè)的產(chǎn)品質(zhì)量、生產(chǎn)效率以及企業(yè)的聲譽(yù)都將有所提高，同時(shí)成本也將得到有效的控制。
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