Multi-Component Fountain Solution for Digital Printing
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Solution Overview
Problem
Ink-based digital printing systems face inefficiencies in ink transfer due to depletion of free silicone oil reserves in imaging plates, leading to increased costs and complexity with external release oil management systems, and non-uniform release agent distribution.
Innovation Solution
A multi-component fountain solution comprising primary ink-rejecting components with a lower boiling point, such as octamethylcyclotetrasiloxane, and secondary ink-release agent components with a higher boiling point, like amino silicone oil, applied to the imaging plate, where the primary components vaporize under laser imaging, leaving a residual release agent for efficient ink transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If free silicone oil is used as ink release agent in imaging plate bulk, then ink transfer efficiency is improved, but the finite reserves deplete leading to degraded performance over time
Solution Approach 1:
The imaging plate is designed to self-replenish release agent through controlled diffusion of silicone oil from the bulk material to the surface during operation. The release agent is not externally added but rather continuously supplied from within the plate structure itself, maintaining ink transfer efficiency throughout operational life without external intervention.
Solution Approach 2:
The imaging plate is pre-loaded with sufficient free silicone oil reserves in the bulk material before use. This preliminary incorporation of release agent ensures that the surface continuously has access to ink release properties throughout the plate's operational life, preventing performance degradation over time.
2Productivity
If external release oil management system is added to replenish silicone oil, then ink transfer efficiency is maintained, but system cost and complexity increase
Solution Approach 1:
The imaging plate structure itself provides the release oil management function through its bulk silicone oil reserves that automatically diffuse to the surface. This eliminates the need for separate external release oil management systems, reducing both cost and complexity while maintaining ink transfer efficiency.
Solution Approach 2:
The release agent storage and delivery functions are merged into the imaging plate structure itself. The bulk material serves dual purposes as both the imaging substrate and the release agent reservoir, eliminating the need for separate external management systems.
3Quantity of substance
If external release oil management system is used, then silicone oil reserves are replenished, but release agent layer uniformity issues arise
Solution Approach 1:
The imaging plate self-regulates release agent distribution through controlled diffusion from the bulk. This natural diffusion process ensures uniform distribution of silicone oil to the surface, avoiding the non-uniformity problems associated with external application systems.
Solution Approach 2:
The mechanical application system for adding release oil is replaced with a diffusion-based self-regulating system. The silicone oil naturally diffuses from the bulk to the surface based on concentration gradients, ensuring uniform distribution without mechanical intervention that could cause non-uniformity.
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 multi-component fountain solution enhances ink release efficiency by maintaining a consistent release agent layer, reducing image quality defects and operational costs, and extending the operational life of the imaging plate by providing continuous ink release without the need for external replenishment.
Implementation Method 1
a high power laser may be used to image-wise vaporize fountain solution from select regions of the imaging plate
Implementation Method 2
The primary components may comprise octamethylcyclotetrasiloxane. The secondary components may comprise amino silicone fluid. The primary components and the secondary components may be miscible and may form a temporally stable solution.
Data Source
AI summary
An Ink-based digital printing system comprises an external fluid applicator for applying multi-component, multi-functional fountain solution to a surface of an imaging plate. The plate is image wise exposed using a high power laser to remove primary components of the fountain solution from select regions of the plate according to digital image data, leaving a layer of the secondary components at said select regions. The plate is then inked with ink useful in printing. The ink adheres to the select regions from which the primary components have been removed to form an ink image. The ink image is transferred at an image transfer step wherein the secondary components enable efficient transfer of the ink to a medium with reduced image quality defects. The multi-component fountain solution comprises primary components that reject or repel ink, and secondary components that function as a release agent.