At present, the blade coating machine has been widely used in various types of packaging, and its type is rich in style and has a good development prospect. The knife coater is mainly used for the composite processing of sizing coating of plastic film, paper, cloth and leather. Common coating equipment includes hot melt adhesive coating, smooth roll coating and anilox roll coating.
In the actual operation of the blade coating machine, it is necessary to properly adjust the pressure of the blade. This is because the pressure applied to the anilox roller by the blade is too small at the time of coating, and when there is an impurity, the blade is caused to be cracked to cause a gap, which makes the coating uneven and the coating amount increases. The factors affecting the blade pressure are: the hardness of the blade and the angle of the blade and the anilox roller. In actual operation, it is better to adjust the scraper with a hammer, and the scraper pressure is generally about 200 to 400 kPa.
At the same time, it is necessary to adjust the angle of the scraper properly. If the angle is too large during the operation of the blade coater, the scraper may be almost against the anilox roller, and the surface of the anilox roller is not smooth, when it is running at high speed. It may cause vibration or beating of the elastic doctor blade, which may result in uneven coating amount, causing a problem of large difference in coating amount.