| 摘要 |
A presensitized litho plate (1) for offset printing comprises a backing film (2) fashioned in plastic material, a sheet of aluminium foil (4) bonded to the backing film by means of adhesive (3), and a coating (7) of photosensitive varnish applied to the metal foil (4); the thickness of the backing is one to four times greater than the thickness of the aluminium foil. |
