印刷兩次，觀察套印精度，印刷廠小編對側(cè)規(guī)拉紙力，進(jìn)紙、壓紙輪、壓紙機(jī)件進(jìn)行檢查調(diào)節(jié)。然后檢查橡皮布的張力，新的橡皮布容易松弛，注意分次收緊，但也不可過于繃緊。再檢查滾筒包襯和印刷壓力。
First, print twice, observe the overprint accuracy, check and adjust the side gauge pulling force, paper feeding, paper pressing wheel and paper pressing machine. Then check the tension of the blanket. The new blanket is easy to relax. Pay attention to tighten it by stages, but it should not be too tight. Check the drum lining and printing pressure again.
再降低油墨的黏度。油墨黏度高，紙張不能順利剝離橡皮布，使紙張的拖梢部分不穩(wěn)定，從而產(chǎn)生重影。可以適當(dāng)降低油墨的黏度。然后就是叼牙的調(diào)節(jié)。叼牙的調(diào)節(jié)不良和保養(yǎng)不當(dāng)是造成重影的一大原因。因此應(yīng)定期做好叼牙的調(diào)節(jié)和維護(hù)檢查，使之經(jīng)常保持良好的工作狀態(tài)。
And then reduce the viscosity of the ink. Ink viscosity is high, the paper can not be smoothly stripped blanket, so that the tip of the paper is unstable, resulting in ghosting. Can be appropriate to reduce the viscosity of the ink. Then there is the adjustment of the teeth. The poor adjustment and improper maintenance of the teeth are the main causes of the double image. Therefore, it is necessary to adjust and maintain the teeth regularly to keep them in good working condition.
1.注意觀察樣張
1. Pay attention to the sample
在印刷中抽樣檢查。進(jìn)入正式印刷后不久，在開印時(shí)確定的供墨量、上水量多少會(huì)有些變化，應(yīng)頻繁抽樣檢查，進(jìn)行再調(diào)整。在印刷速度保持不變，供墨量和上水量等都處于穩(wěn)定的狀態(tài)時(shí)，按每印500~1000張/次的比例進(jìn)行抽樣檢查。然后再印刷的印品中插入警示紙條。以方便于在后工序中進(jìn)行檢查。
First, sample inspection in printing. Shortly after entering the formal printing, the ink supply and water supply determined at the start of printing will change, so it is necessary to conduct frequent sampling inspection and readjustment. When the printing speed remains unchanged and the ink supply and water supply are in a stable state, the sampling inspection shall be carried out according to the proportion of 500 ~ 1000 sheets per printing. Then insert a warning note into the printed product. In order to facilitate the inspection in the later process.
2.印刷廠印刷初期需要注意上水量的變化
2. In the early stage of printing, the printing factory should pay attention to the change of water loading
注意正式印刷初期上水的變化。試印時(shí)的上水量和進(jìn)入正式印刷后的上水量多少都會(huì)有些變化，一定要一邊注意觀察樣張有無重影、水扛子，一邊注意調(diào)解印版的給水量。其次需要注意正式印刷過程中上水的變化。要密切注意機(jī)器主體發(fā)熱和車間內(nèi)的通風(fēng)狀況給上水帶來的影響，酒精潤版要注意潤濕系統(tǒng)冷卻裝置，控制好潤濕液的溫度，上水過少，會(huì)使印版起臟；上水過多將引起油墨乳化，會(huì)帶來一系列問題。
First of all, pay attention to the change of water filling in the early stage of formal printing. There will be some changes in the amount of water applied during the trial printing and after the formal printing. Be sure to observe whether the sample sheet has ghosting and water bearing, and adjust the amount of water supplied to the printing plate at the same time. Secondly, we need to pay attention to the change of water supply in the process of formal printing. Pay close attention to the influence of the heating of the main body of the machine and the ventilation of the workshop on the water supply. Pay attention to the cooling device of the wetting system and control the temperature of the wetting liquid. Too little water supply will make the printing plate dirty; too much water supply will cause ink emulsification, which will bring a series of problems.
3. 印刷初期需要注意印刷油墨的變化、
3. Pay attention to the change of printing ink in the early stage of printing
需要注意墨斗的油墨。墨斗的油墨從墨斗輥和墨斗刮刀之間的縫隙傳出，是由油墨的自重而自然被擠壓出來的。因此，墨斗中油墨量的多少，直接影響油墨的輸出量。另外，印刷油墨具有觸變性質(zhì)。要經(jīng)常用墨刀在墨斗中攪拌，或者安裝油墨攪拌器。
First of all, we need to pay attention to the ink of the ink bucket. The ink of the ink bucket comes from the gap between the ink bucket roller and the ink bucket scraper, which is naturally squeezed out by the weight of the ink. Therefore, the amount of ink in the ink bucket directly affects the output of ink. In addition, printing ink has thixotropic properties. Always use an ink knife to stir in the ink bucket, or install an ink mixer.
其次需要防止油墨在機(jī)器上干燥。并且需要注意油墨均勻，印刷品的密度視上水量、室溫、機(jī)器速度不同而發(fā)生變化。應(yīng)經(jīng)常與標(biāo)準(zhǔn)樣張進(jìn)行對比檢查。注意防止出現(xiàn)墨色不均勻現(xiàn)象。從而保持潤濕液的pH值，油墨中添加了輔助劑后，容易影響潤濕液的pH值，如pH值增 大則易造成印版起臟，因此要特別注意。
Second, the need to prevent ink drying on the machine. And need to pay attention to ink uniformity, printing density depends on the amount of water, room temperature, machine speed and change. It should be compared with the standard sample sheet frequently. Pay attention to prevent uneven ink. So as to maintain the pH value of the wetting solution, after the auxiliary agent is added to the ink, it is easy to affect the pH value of the wetting solution. If the pH value increases, it is easy to cause the printing plate dirty, so special attention should be paid to it.
4.印刷過程中需要注意背面蹭臟
4. Pay attention to the dirt on the back during printing
背面蹭臟是由于油墨干燥緩慢、圖文墨層過厚、紙張平滑度高等原因，使印張表面的油墨粘到上一張印張的背面的現(xiàn)象。
Back rub dirty is due to slow ink drying, graphic ink layer is too thick, paper smoothness and other reasons, so that the ink on the surface of the sheet stick to the back of the previous sheet.
5.如何避免重影故障以及處理方法
5. How to avoid ghosting and how to deal with it
所謂重影就是用一塊印版印出的圖像錯(cuò)移，在印張上能夠看到雙重、三重的圖影。重影的原因有多種，比如紙張、叼牙、滾筒、橡皮布、印速、油墨黏度等各種因素非常復(fù)雜。一般可以采用一下幾個(gè)方法來檢查原因并處理。
The so-called double image is to use a plate to print the wrong image, in the sheet can see double, triple image. There are many reasons for ghosting, such as paper, teeth, roller, blanket, printing speed, ink viscosity and other factors are very complex. Generally, the following methods can be used to check the causes and deal with them.
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