The Meyer Bar Coating Method To Coat Paper

The paper coating is a blend of white color, a binder, and clay. These ingredients when put in different intensities, create different degrees of hardness, roughness, and smoothness in a paper. These varying degrees can end up making paper glossy, dull, or matte. And it is due to these variations, the appearance and surface of the paper vary. 

When the coating is applied to a printing sheet, it provides the sheet with a surface on which the ink can stay. On the contrary, if the surface of an opaque sheet is uncoated, the ink will be absorbed by it. The hard coating promotes a reduction in dot gain. The dot gain is a process in offset lithography and other printing forms that enhances the printed material. Moreover, this helps in boosting the readability of the paper and the coated paper surface reflects more even light. This coating can be done using various methods. The most commonly used method is discussed below.

UEC Wire Bar Coater

A wire bar coater is one of the traditional coating methods where the coating is applied using a Meyer bar or wire wound. The motor-operated unit has an offset blanket of standard coating area. The coating takes place under precisely controlled conditions and at a speed between 2-15 mm per minute to achieve a uniform coating. 

The unit consists of a stainless steel bar, having a wire wound around it. The thickness of the coating is largely determined by the diameter of the coating wire. This wire is chosen based on three factors:

• The viscosity of the coating material (Material could be paints, varnishes, starch, liquid printing inks, etc.)
• The desired thickness of the coat
• The coating speed 

The unit comes with seven numbers of coating rods that provide different coating thicknesses to the specimen.

Bottom Line

Coating paper with the most useful method is possible if you have the right coating instrument. Source it today from UEC and also get to know about various surface coating and printability tester equipment that we house.