Liquid transfer articles and method for producing the same using digital imaging photopolymerization
View Patent ↗A liquid transfer article is provided including a support assembly and an imaged surface formed directly on the surface of the support assembly by digital photopolymerization. The support assembly is in the form of a polymeric base, and the liquid transfer article is formed by providing a liquid photopolymer on the surface of the base and then irradiating the polymer with a light source to form the image. The liquid transfer article is reimagable and may be used in gravure printing processes, as well as other printing applications.
1. A maskless digital imaging photopolymerization system for producing a cross-linked photopolymerized printing plate having an imaged surface layer with x, y, and z dimensions, said imaged surface layer being usable in graphic arts reproduction applications to provide accurate metering of a liquid and to transfer the liquid to another surface, said system comprising:
a support assembly adapted to receive at least a first layer of a cross-linkable liquid photopolymer;
a light source for irradiating said cross-linkable liquid photopolymer layer, said light source and said support assembly are adapted to be held stationary at least during formation of the imaged surface layer of the cross-linked photopolymerized printing plate;
a spatial light modulator having individually controllable elements in a matrix disposed between said light source and said support assembly; and
a microprocessor connected to said spatial light modulator and adapted to control operation of said individually controllable elements such that said spatial light modulator provides light from said light source at various wavelengths and intensities in an image pattern toward said support assembly in order to form the imaged surface layer with x, y, and z dimensions in the cross-linkable liquid photopolymer layer in one step.
2. The maskless digital imaging photopolymerization system of claim 1 wherein said light source comprises a visible light source.
3. The maskless digital imaging photopolymerization system of claim 1 wherein said individually controllable elements are micromirrors.
4. The maskless digital imaging photopolymerization system of claim 1 wherein said support assembly is a generally flat surface.
5. The maskless digital imaging photopolymerization system of claim 1 wherein said wavelengths are varied by a color wheel provided between said light source and said spatial light modulator.
6. The maskless digital imaging photopolymerization system of claim 1 wherein said graphic arts reproduction applications includes intaglio and anilox.
7. The maskless digital imaging photopolymerization system of claim 1 wherein said imaged pattern may take the form of any indicia including numbers, letters, and graphics.
8. The maskless digital imaging photopolymerization system of claim 1 wherein said cross-linkable liquid photopolymer is selected from the group consisting of acrylates, epoxies, urethanes, unsaturated polyesters, and combinations thereof.
9. The maskless digital imaging photopolymerization system of claim 1 wherein said microprocessor is adapted to differentiate properties in the x, y, and z dimensions of said imaged surface layer by selecting a light intensity or wavelength for each individual micromirror.
10. The maskless digital imaging photopolymerization system of claim 1 , wherein said microprocessor is adapted to control the wavelength or light intensity of the light provided by said spatial light modulator in order to vary properties such as depth, mechanical strength, hardness, and degree of cross-linking in said cross-linkable liquid photopolymer.
11. A method of making a cross-linked photopolymerized printing plate having an imaged surface layer with x, y, and z dimensions comprising using the maskless digital imaging photopolymerization system of claim 1 .
12. The method of claim 11 , wherein said imaged surface layer is produce by building up a plurality of said imaged surface layers one on top of each other.
13. The method of claim 11 , further comprises removing non-linked portions of said liquid photopolymer and subjecting said printing plate to a detackification process.