About printing (what is a drying board)?

Sunshine exposure, printed matter printing is the work of copying pictures and texts on high transparency carriers such as film and sulfuric acid paper to screen, PS and resin plates coated with photosensitive materials through exposure. Coating a photosensitive film on the surfaces of screen, PS and resin plates, drying, covering the film with an image, and irradiating the film with strong light to expose the image on the film and photocopy it on the photosensitive film on the plate. This exposure photocopying process is usually called printing (excerpts and other places).