Metering Coating Stick Notes

Bar coating is a simple coating method. The coating metering rod coats the excess paint on the paper surface, and the excess paint is scraped off by the reverse rotation of the metering rod, so that the paint can be accurately quantified on the paper surface. On, to obtain the required coating amount. Generally, the rotation speed of the metering rod is slightly lower than the forward speed of the paper, and the maximum speed limit is 50% of the paper speed. After the coating layer is coated on the paper surface, part of the coating adhered to the paper surface will penetrate into the paper layer due to moisture. , so as to form a filter cake layer with higher solid content, and part of the paint with higher fluidity is hung down.

Coating metering rods generally have a diameter of about 6-10mm. The larger the paper weight, the larger the diameter of the metering rods required. There are generally two types of metering rods, one is the extrusion type (also called forming type) thread process , is exquisitely made of stainless steel, and the surface is chrome-plated to make the metering rod less prone to wear and tear during rotation and friction. The other is to densely wind a steel wire of a certain precise diameter on a stainless steel rod to form a wire-wound coating rod. Taking RDS in the United States as an example, different wet film thicknesses can be customized from 4.6um to 144um. The larger the amount of coating, the thicker the steel wire selected.

Due to the small diameter of the coating metering rod, the rigidity is not as great as that of the anilox roller. It needs to be supported by a metering rod bracket and dragged by a micro-motor reducer.

Metering coating stick notes with picture 1