| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a developer evaluation method for a lithographic printing plate capable of evaluating accurately an activity of a developer. <P>SOLUTION: This developer evaluation method for the lithographic printing plate evaluates the developer used for an infrared photosensitive lithographic printing plate precursor, according to the following (A)-(D) processes. (A): the process for infrared-exposing a standard pattern with a plurality of AM dot images with gradually different area factors by an AM screen system, and an FM dot image by an FM screen system adjacent respectively to the plurality of AM dot images, using a circular dot having 10 μm-75 μm of diameter, and having a prescribed an area factor, to the infrared photosensitive lithographic printing plate precursor, (B): the process for preparing a standard plate by developing the already infrared-exposed plate exposed by the (A) process with a standard developer, (C): the process for preparing an objective development evaluating plate by developing the already infrared-exposed plate exposed by the (A) process different from that in the (B) process, with the evaluation-objective developer, and (D) the process for comparing the area factor of the standard plate with the area factor of the objective development evaluating plate. <P>COPYRIGHT: (C)2009,JPO&INPIT |
