Dry planographic printing plate
    2.
    发明授权
    Dry planographic printing plate 失效
    干版印刷版

    公开(公告)号:US3894873A

    公开(公告)日:1975-07-15

    申请号:US34346473

    申请日:1973-03-21

    Abstract: Presensitized planographic printing plate for use in dry planography. A positive acting plate having a flexible base and a relatively thick (0.02 to 2.00 mil) silicone rubber layer, overlying a photo-polymerizable and photoadhesive-layer. Upon exposure to light through a positive transparency, the photoadhesive layer in the exposed non-image area polymerizes and adheres firmly to the thick silicone rubber overlayer, but the photoadhesive layer in the unexposed image area remains nonadhesive to the silicone overlayer. Following the exposure, the surface of the plate is treated with developing liquid capable of swelling silicone rubber. The thick silicone rubber layer in the unexposed image area is easily removed, exposing a sharp image of oleophilic photoadhesive layer underlying the removed silicone layer, while the silicone rubber layer in the exposed background area remains bound to the photoadhesive underlayer. The exposed surface of the photoadhesive layer accepts ink from inking rollers, while the silicone rubber background area does not remove ink from the rollers, and thus remains ink-free.

    Abstract translation: 用于干式平版印刷的预感平版印刷版。 一种具有柔性基底和相对较厚(0.02至2.00密耳)的硅橡胶层的正性作用板,其覆盖在光可聚合和光致粘附层上。 通过正透明度曝光时,曝光的非图像区域中的光致粘附层聚合并牢固地粘附到厚的硅橡胶覆盖层,但未曝光图像区域中的光致粘附层保持与硅氧烷覆盖层不粘合。 曝光后,用可膨胀硅橡胶的显影液处理板的表面。 未曝光图像区域中的厚硅橡胶层容易去除,暴露出被除去的硅氧烷层下面的亲油性光粘合层的清晰图像,而暴露背景区域中的硅橡胶层仍然粘附到光粘合底层。 光固化层的露出表面从上墨辊接受油墨,而硅橡胶背景区域不会从辊中除去油墨,因此保持无油墨。

Patent Agency Ranking