Patent ID: 8790864
Filing Date: 2014-07-29
Classification: G03F

Abstract:
1. A method of tailoring the shape of a plurality of relief printing dots created in a photosensitive printing blank during a platemaking process, said photosensitive printing blank comprising at least one photocurable layer disposed on a backing layer, the method comprising the steps of: a) selectively exposing the at least one photocurable layer to a source of actinic radiation to selectively crosslink and cure the at least one photocurable layer; and b) developing the exposed at least one photocurable layer of photosensitive printing blank to reveal a relief image therein, said relief image comprising the plurality of relief printing dots; wherein the source of actinic radiation comprises an array of UV LED light assemblies, the array of UV LED light assemblies comprising at least two rows of UV LED lights, wherein the use of the array of UV LED light assemblies produces relief printing dots having at least one geometric characteristic selected from the group consisting of a desired planarity of a top surface of the relief printing dots, a desired shoulder angle of the relief printing dots and a desired edge sharpness of the relief printing dots, wherein each UV LED light in the first row of UV LED lights has the same peak wavelength and wherein each UV LED light in the second row of UV LED lights has the same peak wavelength and wherein the peak wavelength of the UV LED lights in the first row of UV LED lights and the peak wavelength of the UV LED lights in the second row of UV LED lights are different.