Position and angle details of the hottest doctor b

2022-09-21
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The position and angle details of the doctor blade

the position of the doctor blade is jointly determined by the doctor blade and the stamping point, that is, the position of the doctor blade is the distance between the contact point of the doctor blade and the stamping point on the plate cylinder. There are many factors that determine the position of the doctor blade, such as the speed of the printing machine (related to the drying speed of the ink). If the printing speed is slow and the drying speed of the ink is highly related, the distance between the doctor blade and the embossing point should be closer

the angle of the doctor blade should be the same whether it is a linear doctor blade or a curve doctor blade. The best contact angle between the doctor blade shaft and the plate is 60 degrees, which can ensure that the doctor blade can scrape the excess ink on the surface of the plate cylinder

we can see such a straight line: the straight line connecting the contact point and the two points of the central point of the plate cylinder, and the included angle between the scraper axis and this straight line, which we generally call setangle. At present, China has signed 11 regional trade arrangements and agreements with relevant countries and regions. The angles should be set when the plate cylinder is stationary and the pressure on the doctor blade has not been applied. It is usually regarded as the biggest difficulty of the printing press, in addition to the breakthrough in technology research and development, it is also a parameter of regulation

when pressure is applied to the doctor blade, this angle will change slightly, especially when the linear doctor blade is used, the change of angle is slightly obvious, while the change when the curved doctor blade is used is relatively small, because the curved doctor blade will bend towards the drum under the action of pressure. Generally speaking, the angle between 10 and 40 degrees is suitable for most printing machines

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