| 摘要 |
In the preparation of an offset printing plate comprising forming printing plate images with droplets of lipophilic ink by using a printing means based on the inkjet method, lipophilic ink having a UV curing property is used, and a UV lamp 7 is also carried on a carriage 8 carrying a printing head 6 . While performing multipass printing by a dot thinning method for the main scanning direction and subscanning direction with the printing head 6 , droplets on a printing plate material 2 immediately after the printing are cured with ultraviolet rays irradiated by the UV lamp 7 . Moreover, ultraviolet rays are irradiated also in the period of returning of the carriage 8 . Since blotting of the droplets immediately after printing do not overlap with one another, and the droplets are cured in every pass, extremely precise tone reproduction can be realized. Moreover, as the UV lamp 7 , a UV lamp of a small output capacity can be used, and thus cost of the apparatus can be reduced.
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