紙箱廠介紹由于生產紙箱使用的原材料不同，所以呈現(xiàn)白點概率也不同。常見的鋁復合膜出現(xiàn)白點分兩種情況，一是下機時有，熟化后基本消失；二是下機有，熟化后不會消失。后面一種嚴重影響表觀。為什么會出現(xiàn)印刷白點呢？
According to the carton factory, due to the different raw materials used in the production of cartons, the probability of white spots is also different. There are two common cases of white spots on aluminum composite film: one is when it is off the machine and basically disappears after ripening; Second, it will not disappear after ripening. The latter one seriously affects the appearance. Why do printing white dots appear?
紙箱廠紙箱印刷出現(xiàn)白點原因及解決方法：
Causes and solutions of white spots in carton printing in carton factory:
1.上膠量不足。如果上膠網(wǎng)線出現(xiàn)堵塞或者磨損，引起膠粘劑固含量不足就會導致上膠量小而出現(xiàn)白點。經(jīng)常清洗上膠網(wǎng)線輥，保證上膠量。在停機時保持發(fā)動網(wǎng)線輥空轉，防止堵板，根據(jù)印刷品狀態(tài)調整膠水濃度選擇合適的網(wǎng)線輥。
1. Insufficient glue amount. If the gluing screen cable is blocked or worn, resulting in insufficient solid content of adhesive, it will lead to small gluing amount and white spots. Clean the gluing wire roller frequently to ensure the gluing amount. When the machine is shut down, keep the wire roller idling to prevent blocking. Adjust the glue concentration according to the print state and select the appropriate wire roller.
2.紙箱廠印刷工序溶劑殘留高和復合工序溶劑殘留高都會出現(xiàn)白點，因為發(fā)生這兩種情況材料阻隔性比較好，在復合后導致溶劑殘留高，熟化后復合膜內的大量溶劑被釋放出來形成氣泡和白點，甚更多的白點。
2. The high solvent residue in the printing process and the high solvent residue in the composite process in the carton factory will lead to white spots, because the barrier property of the material is relatively good in these two cases, resulting in high solvent residue after compounding. After curing, a large amount of solvent in the composite film is released to form bubbles, white spots, or even more white spots.
解決方法：盡量控制印刷工序及復合工序溶劑殘留量，必要情況下將下機樣品放入80℃烘箱中30分鐘，觀察白點有無消失，在這里提醒大家烘箱溫度分段設定，避免剛開始溫度過高，涂膠界面結皮，溶劑揮發(fā)不完全。
Solution: try to control the residual amount of solvent in the printing process and composite process. If necessary, put the off machine sample into the 80 ℃ oven for 30 minutes and observe whether the white spot disappears. Here, we remind you to set the oven temperature in sections to avoid excessive temperature at the beginning, peeling at the gluing interface and incomplete solvent volatilization.
3.油墨隱瞞力差。紙箱廠介紹油墨隱瞞力差會引起白點，特別是淡色油墨。光線穿過油墨層而被鋁層反射回來，發(fā)生的白點選擇隱瞞力好、油墨粒度細的油墨。恰當增加上墨量，進步隱瞞率。這兒并不是說粘合劑本身，這種粘合劑表面張力高，涂布性能差，涂布不均形成的白點現(xiàn)象。
3. Poor concealment of ink. Carton factory introduced that the poor concealment of ink will cause white spots, especially light ink. The light passes through the ink layer and is reflected back by the aluminum layer. For the white spots, choose the ink with good concealment and fine ink particle size. Properly increase the amount of ink and improve the concealment rate. This is not the adhesive itself. This adhesive has high surface tension, poor coating performance and uneven coating.
This article is provided for you by the carton manufacturer. Our website is http://www.flyconn.cn We will wholeheartedly welcome your visit
