Charged Aerosol Development for Variable Data Lithography
Solution Overview
Problem
The high power consumption and cost of high power lasers in variable data lithography systems limit print speed and compromise the lifetime of components, necessitating a reduction in power consumption and an increase in speed.
Innovation Solution
A charged fountain solution aerosol development device is introduced, which uses a rotatable imaging member with an electrostatic charge-retentive surface and a rotatable inkable blanket to create a fog of charged fountain solution aerosol particles, allowing for efficient transfer of ink images onto a substrate through a particle charger, sorter, and delivery baffle, optimizing the charge-to-mass ratio of aerosol particles for improved image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high power laser is used to evaporate fountain solution and form latent image, then image formation is achieved, but power consumption increases and component lifetime decreases
Solution Approach 1:
The patent replaces the thermal evaporation mechanism (laser heating) with an electrostatic deposition mechanism. Instead of using high power laser to evaporate fountain solution, the system uses charged aerosol particles that are electrostatically attracted to and deposited on the imaging drum surface, forming the latent image through charge transfer rather than thermal processes.
Solution Approach 2:
The patent changes the fundamental parameter of image formation from thermal energy (laser power) to electrical charge (aerosol particle charge). By controlling the charge-to-mass ratio of aerosol particles and their electrostatic interaction with the imaging drum, the system achieves precise image formation without requiring high thermal power input.
2Manufacturing precision
If high power laser is used to evaporate fountain solution, then latent image is formed, but print speed is limited
Solution Approach 1:
The patent replaces the thermal evaporation process with electrostatic deposition. The charged aerosol particles are directly attracted to and deposited on the imaging drum surface through electrostatic forces, eliminating the need for thermal processing time. This enables faster image formation and increases print speed.
Solution Approach 2:
The aerosol generation and electrostatic deposition process can operate continuously without the thermal constraints that limit laser-based systems. The charged particles are continuously generated, charged, and deposited onto the rotating imaging drum, maintaining continuous productive action throughout the imaging process.
3Manufacturing precision
If high power laser is used for image formation, then processing is achieved, but system cost increases
Solution Approach 1:
The patent replaces expensive high power laser components with more economical aerosol generation and electrostatic charging systems. Instead of requiring high power laser modules, the system uses standard aerosol generators combined with electrostatic charging mechanisms, significantly reducing the cost of image formation hardware.
Solution Approach 2:
The system uses consumable charged aerosol particles that can be generated continuously from liquid fountain solution, replacing the need for expensive, durable high power laser hardware. The aerosol particles serve as a disposable medium that transfers charge without requiring costly optical components.
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
This solution reduces power consumption, increases print speed, and extends the lifespan of components by efficiently delivering charged fountain solution aerosol particles to form high-resolution images, thereby enhancing the overall performance of the variable data lithography system.
Implementation Method 1
a particle charger configured to drive a flux of ions through the fountain solution aerosol particles to form a fog of charged fountain solution aerosol particles
Implementation Method 2
charged fountain solution aerosol particles that are sufficiently attracted to the electrostatic charged pattern
Data Source
AI summary
Ink-based digital printing systems useful for ink printing include a rotatable charge-retentive reimageable surface layer configured to receive a layer of fountain solution. The fountain solution is carried to the charge retentive surface by a fog or mist including fountain solution aerosol particles, dispersed gas particles, and charge directors that impart charge to the fountain solution aerosol particles. The charge-retentive reimageable surface may be charged to a uniform potential, and selectively discharged using an ROS according to image data to form an electrostatic latent image. The charged fountain solution adheres to portions of the charge-retentive reimageable surface according to the electrostatic latent image to form a fountain solution image thereon. The fountain solution image can be partially transferred to an imaging blanket, where the fountain solution image is inked. The resulting ink image may be transferred to a print substrate.