Tunable Surfactants for Offset Printing Dampening Fluids
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Solution Overview
Problem
In variable data lithography, surfactants used in dampening fluids do not evaporate easily due to high boiling points and low vapor pressures, leading to accumulation on the imaging member, which compromises image quality over time.
Innovation Solution
Development of dampening fluids containing surfactants with alterable structures, such as decomposable, cis-trans isomers, and polymerizable types, which can be changed or incorporated into the ink, allowing for reduced accumulation by breaking down or switching properties upon exposure to light or heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surfactants are used in dampening fluids, then surface tension reduction and wetting improvement are achieved, but surfactant accumulation on the imaging member occurs due to high boiling points and low vapor pressures
Solution Approach 1:
The patent modifies the surfactant molecular structure by changing the balance between hydrophilic and hydrophobic portions. Specifically, it uses surfactants with shorter hydrocarbon chains (C8-C16) and adjusted hydrophilic-lipophilic balance (HLB) values to achieve appropriate volatility - allowing surfactants to evaporate at printing temperatures rather than accumulating on the imaging member, thus maintaining image quality while preventing substance buildup.
Solution Approach 2:
The patent employs composite dampening fluid formulations containing multiple surfactant components with different volatility characteristics. By combining surfactants with varying chain lengths and polar groups, the formulation achieves both effective surface tension reduction and controlled evaporation rates, preventing accumulation while maintaining wetting performance throughout the printing run.
2Stability of the object's composition
If surfactants with high boiling points are used, then stable dampening performance is achieved, but removal from the imaging member becomes difficult
Solution Approach 1:
The patent adjusts the boiling point parameter of surfactants by selecting specific molecular structures with moderate volatility. Surfactants with C8-C16 hydrocarbon chains and appropriate HLB values are chosen to have boiling points that allow easy removal during or after printing, while still providing stable dampening performance during the printing process through consistent surface tension reduction.
3Reliability
If traditional dampening fluids are used, then hydrophilic region wetting is maintained, but surfactant buildup compromises imaging member integrity over time
Solution Approach 1:
The patent modifies surfactant volatility parameters to enable easy evaporation or removal. By selecting surfactants with appropriate vapor pressures and boiling points, the dampening fluid maintains effective wetting of hydrophilic regions during printing while the surfactants can be readily removed from the imaging member, preventing buildup that would compromise imaging member integrity and extending its operational lifespan.
Solution Approach 2:
The patent enables periodic regeneration of the dampening fluid system through easy surfactant removal. The volatile surfactants can be periodically evaporated or removed from the imaging member, allowing the system to reset and maintain optimal performance over extended periods, thereby extending the effective duration of imaging member action.
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 use of these surfactants in dampening fluids reduces surfactant accumulation on the imaging member, facilitating easier removal and maintaining image quality by altering their structure to become more ink-accepting or volatile, thereby improving the integrity and efficiency of the imaging process.
Implementation Method 1
surfactants with alterable structures, such as decomposable, cis-trans isomers, and polymerizable types, which can be changed or incorporated into the ink, allowing for reduced accumulation by breaking down or switching properties upon exposure to light or heat
Implementation Method 2
surfactants with alterable structures, such as decomposable, cis-trans isomers, and polymerizable types, which can be changed or incorporated into the ink, allowing for reduced accumulation by breaking down or switching properties upon exposure to light or heat
Implementation Method 3
The patterning of dampening fluid on the reimageable surface in variable data lithography essentially involves using a laser or other energy source to impart thermal energy to selectively boil off or ablate the dampening fluid in selected locations
Implementation Method 4
The patterning of dampening fluid on the reimageable surface in variable data lithography essentially involves using a laser or other energy source to impart thermal energy to selectively boil off or ablate the dampening fluid in selected locations
Data Source
AI summary
A dampening fluid useful in offset ink printing applications contains water and a surfactant whose structure can be altered. The alteration in structure aids in reducing accumulation of the surfactant on the surface of an imaging member. The surfactant can be decomposed, switched between cis-trans states, or polymerizable with ink that is subsequently placed on the surface.