| 摘要 |
PURPOSE:To enable a long or wide product to be continuously formed without forming zebra phenomenon, by using a cover film or a base film in place of a negative film for exposure. CONSTITUTION:For example, a cover film 7 is made of a usual plastic film, and desirable letters or patterns are printed with a light-shading ink by a screen printing method, etc. An considerably wide cover film 7 independent of length, can be used by the screen printing method, etc. A photosensitive resin 5 held between a base film 1 and the cover film 7 is exposed to light from a light source 10 while horizontally conveyed. At that time, the film 7 and the resin 5 are in close contact with each other, and since there is no air layer between the 2 layers 7, 5, zebra phenomenon has no danger of occurrence, thus permitting continuous manufacture of long or wide products without causing zebra phenomenon. |
