The pressure, sharpness and contact position of the scraper have influence on the printing quality. According to the actual needs, reasonable adjustment of these factors can solve many printing problems. 1. The factors that influence the pressure of the squeegee are the cylinder pressure, the different hard and soft blades, the cross angle between the doctor blade and the plate, etc. the greater the slope, the greater the pressure. Too much pressure will reduce the transfer rate of ink, the plate, blade wear larger; too small pressure is easy to produce dirty plate or scraper line. 2. The sharpness of the knife depends on whether the knife is new, the blade angle when grinding, and the type of sandpaper (oilstone) used. The suitable sharpness of the knife should not only effectively scrape the ink, but also do not produce the cutter thread. Too sharp scraper often easy to produce traces of the knife, but also wear plate. 3. The distance between the squeegee and the printing plate can improve the ink transfer rate, but it is easy to produce dirty plate; on the contrary, it can effectively solve the dirty plate and avoid some small line marks, but it will reduce the ink transfer rate. 4. The flatness and warpage of the knife mainly depends on the installation method. Of course, it may also be related to the foreign matters stuck in the tool carrier groove or on the blade and lining. When the flatness of the knife is poor, there will be some water droplets on the edge of the printing surface, or some intermittent line marks will appear from time to time. Some people think that rough ink, ink liquidity will produce the above phenomenon, in fact, knife unevenness will also occur this situation. 5. The movement of the doctor blade, the left and right movement of the doctor blade plays an important role in reducing the scraper line, improving the utilization rate of the scraper and reducing the wear of the plate. If the doctor blade movement is not normal, we should find ways to improve. When line marks appear in printing, one is to cause plate damage, the other is that the scraper is not sharp. However, another reason is that there are foreign bodies sticking to the back of the blade. The solution is to move the blade back and forth up and down in order to get rid of the adhesive. If it can't be shaken off, you can only stop to wipe the blade. There is also a problem with the scraper, and many people misunderstand it is caused by ink. This means that sometimes there are dozens of irregular lines with different lengths. It looks like the ink is piled up. It is different from the scraper line. It is not continuous, but sometimes not. This is actually caused by the pressure of the scraper is too small or the blade is not sharp enough. There are differences and similarities in the above indicators of scraper. When solving specific problems, one of them can be used, and sometimes it needs comprehensive application to completely solve the problem。 For example, when there are some intermittent ink lines, you can not only increase the pressure to solve, but also can solve by sharpening the knife; when there is a more serious dirty version, it needs to combine several aspects to use; one is to use a sharp blade; the second is to increase the pressure; the third is to increase the distance between the scraper and the contact side. When the scraper is seriously worn and cannot be polished with sandpaper or oilstone, a special grinder can be used for grinding, so that it can be reused several times, greatly reducing the cost of the doctor blade.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
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