Variable Digital Offset Lithography for Pearlescent Ink Delivery
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Solution Overview
Problem
Conventional digital printing technologies face challenges in producing high-quality, variable pearlescent images due to the difficulty in stabilizing large solid pigment particles, which are necessary for the pearlescent effect, and the limitations of inkjet printing systems in handling viscous inks with large particles, leading to clogging and loss of pearlescent properties.
Innovation Solution
A variable digital offset lithographic printing system that uses pearlescent inks with pigment particles of 10 to 20 microns in size, suspended in an aqueous acrylate solution, allowing for higher pigment loading and viscosity, enabling the production of high-quality pearlescent images without pulverizing the particles, which maintains the pearlescent effect and supports variable data printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional inkjet printing is used to deliver pearlescent inks, then digital printing capability is achieved, but the large pigment particles (10-20 microns) cause jet clogging and ink formulation becomes unstable
Solution Approach 1:
The patent introduces an intermediary transfer mechanism (offset lithographic printing system) between the digital imaging system and the substrate. The digital system creates an image on a transfer medium, which is then transferred to the substrate using offset lithography. This intermediary approach allows digital variable data printing while using a different delivery mechanism that can handle large pigment particles without clogging.
Solution Approach 2:
The patent replaces the mechanical inkjet deposition system with an offset lithographic printing system. Instead of using inkjet nozzles to deposit pearlescent ink directly, the system uses offset lithography with a dampening solution and ink transfer mechanism, which can accommodate large pigment particles (10-20 microns) without clogging issues.
2Ease of operation
If pigment particles are pulverized to smaller sizes for jettable inks, then inkjet printing becomes feasible, but the pearlescent effect is lost
Solution Approach 1:
The patent inverts the conventional approach by not reducing particle size for printability. Instead, it maintains large particle sizes (10-20 microns) necessary for the pearlescent effect and uses offset lithography, which is inherently capable of handling such particles. This inversion resolves the contradiction by prioritizing the pearlescent effect while achieving printability through an alternative method.
3Stability of the object's composition
If conventional lithographic printing is used for pearlescent images, then stable pigment suspension is achieved, but variable data printing capability is lost due to permanently patterned plates
Solution Approach 1:
The patent introduces dynamics into the traditionally static offset lithographic system by using digitally controllable imaging on the transfer medium. The plate or blanket can be dynamically re-imaged for each print job or even each impression, allowing variable data printing while maintaining the stable pigment suspension characteristics of offset lithography.
Solution Approach 2:
The patent segments the printing system into distinct functional components: a digital imaging system that creates variable data images on a transfer medium, and an offset lithographic transfer system that delivers the ink to substrates. This segmentation allows each component to optimize its function - digital imaging provides variable data capability while offset lithography provides stable pigment handling.
4Manufacturing precision
If higher pigment loading is used for better pearlescent effect, then image quality improves, but ink viscosity increases causing jetting difficulties
Solution Approach 1:
The patent replaces the inkjet deposition mechanism with offset lithography, which has different rheological requirements. Offset lithographic inks can accommodate higher pigment loading and greater viscosity without the clogging issues that plague inkjet systems. This substitution allows formulation of inks optimized for pearlescent image quality with high pigment concentration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively produces high-quality pearlescent images on successive substrates, overcoming the limitations of conventional digital printing by maintaining the pearlescent effect and enabling variable data printing with higher pigment loading and viscosity, while avoiding the need for particle pulverization.
Implementation Method 1
pearlescent inks with pigment particles of 10 to 20 microns in size, suspended in an aqueous acrylate solution
Implementation Method 2
The visual phenomenon known as pearlescence refers generally to a limitedly iridescent response of a prepared surface to incident light
Data Source
AI summary
A system and method are provided for producing variable pearlescent image elements or portions on image receiving media substrates using a variable digital data offset lithographic architecture which provides for varying lithographic images between cycles of a marking device. Pearlescent inks are provided with a solid particle pearlescent pigment components in a proportion of at least 30% by weight suspended in solution in an ink composition. Pearlescent inks are provided with a solid particle pearlescent pigment components having particle sizes in excess of ten microns suspended in solution in the ink composition. The disclosed systems and methods provide for variable pearlescent image elements or portions to be formed on an image receiving medium substrate separate from, or in combination with, other ink image elements or portions applied using other inks in a single device, and/or in a single pass of the image receiving media substrates through an image forming system.