| 摘要 |
PURPOSE:To produce a support base for a printing plate which is free of thermal deformation, enbales fine graining, enhances resistance to contamination during printing, and ensures excellent plate wear characteristics, by graining a support base for a planographic plate by irradiating with laser in a liquid. CONSTITUTION:A base for a planographic plate is grained by irradiating with laser in a liquid. As a blank material for an aluminum plate, a material having a purity of aluminum of at least 99.0% is preferred. The thickness of the aluminum plate is practically selected appropriately from the range of 0.1-0.5 mm. The laser for irradiation may be CO laser, yttrium-aluminum-garnet (YAG) laser, ruby laser or the like, and is appropriately selected according to the kind of the support base, a grained shape desired, or the like. For example, in the case of an aluminum plate, a laser with a shorter wavelength such as YSG laser is preferable, and the energy of irradiation is appropriately selected according to the material of the support base, focal length, beam diameter, the kind of laser or the like. |
