Brand, a product name, a specification, etc. are printed on the side face of a filter frame.
Printing is performed not on a flat surface but on a curved surface. Even in the case of the same product, when the diameter of the filter becomes smaller, the curved line becomes sharp. In addition, some products use different material. Printing process needs know-how.
The name of manufacturer and brand represents features of the product. Operations are performed with the greatest care.