| 摘要 |
PURPOSE:To decrease the frequencies of a brush exchange and to prevent a brush made of polyethylene(PE) phthalate in hair part from being deteriorated even after long-term use by using the above-mentioned brush as a development accelerating means. CONSTITUTION:The brush made of the PE terephthalate in the hair part is used as the development accelerating means at the time of supplying a developer to the surface of a photosensitive planographic printing plate while automatically transporting the printing plate by using an automatic developing machine and subjecting the plate to development processing by imparting a development accelerating means. The hair of the brush is the hair, 50% (the number of pieces of the hair) of which is made of the PE terephthalate, or >=50wt.% of the material of the hair consists of the PE terephthalate. The photosensitive planographic printing plate is transported to a developing tank 4 at the time of development and is immersed into the developer in the developing tank 4. The photosensitive layer is rubbed by a brush roller 5 in the process of this immersion, by which the development is accelerated and the photosensitive layer of the non-image part is removed. Then, the deterioration of the function of the brush is prevented and the frequencies of the exchange of the brush are decreased. |
