The principle of film coating
The majority of coated films or fabrics are coated at CMC Klebetechnik using the Meyer-Bar principle. In this process, the material to be coated passes through an "adhesive bath". The film or fabric takes a certain amount of adhesive solution with it. The excess adhesive is then stripped off under the fixed Mayer bar in the set gap.
This method can be used to coat extremely different coating materials with a very flexible application weight. In most cases, the application weight is determined more by the amount of solvent to be evaporated and the drying behavior than by the process used.
Alternatively, the fixed doctor edge can be a bar with a regular structure. In the case of a so-called doctor roll, the wire diameter is one of the factors that determines the coating weight.
The use of masks also allows strip coating (i.e. adhesive-free areas next to coated areas; strip coating)
Learn more about our custom coatings and coating techniques here.
Another common method used at CMC in addition to the commar squeegee is the wire roller squeegee.
Here, the coating compound is applied to the film via a scoop shaft and the excess compound is squeegeed off via a wire doctor blade.