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    • 48. 发明授权
    • Method for processless flexographic printing and flexographic printing
plate
    • 无机柔版印刷和柔版印版的方法
    • US6159659A
    • 2000-12-12
    • US298956
    • 1999-04-26
    • Daniel Gelbart
    • Daniel Gelbart
    • B32B3/30B41C1/00B41C1/05B41N1/06B41N1/12G03F7/00G03F7/36G03C1/76G03C1/77
    • B41C1/05B41N1/12Y10S430/146
    • A plate for flexographic, or `raised image`, printing consists of a backing layer, an intermediate layer and a top layer. The backing comprises a thin metallic sheet or a thin polyester sheet for dimensional stability. The intermediate layer is a closed-cell elastomer foam. The top layer is a thin layer of solid elastomer. The intermediate layer absorbs strongly at an operating wavelength where the backing is either essentially transparent or highly reflective. When the plate is cut with a laser operating at the operating wavelength then the cutting action is self-limiting. As soon as the backing is exposed to the laser beam then the beam is either transmitted through the backing or reflected from the backing. In either case damage to the backing is avoided. Most of the thickness of the plate is in the intermediate layer which has a low density. Thus it takes much less energy to cut a plate according to the invention than is required to laser cut conventional flexographic printing plates.
    • 用于柔性版或“凸起图像”的印版由背衬层,中间层和顶层组成。 背衬包括用于尺寸稳定性的薄金属片或薄聚酯片。 中间层是闭孔弹性体泡沫。 顶层是固体弹性体的薄层。 中间层在背衬基本上是透明或高反射性的工作波长下强烈吸收。 当用操作波长的激光器切割板时,切割动作是自限制的。 一旦背衬暴露于激光束,则光束或者透射通过背衬或从背衬反射。 无论在哪种情况下,都可以避免对背衬的损坏。 板的大部分厚度在具有低密度的中间层中。 因此,切割根据本发明的板比激光切割常规柔版印刷版所需的能量要少得多。