Blanket Heating for Liquid Electro-Photographic Memory Artifact Reduction
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Solution Overview
Problem
In Liquid Electro-Photographic (LEP) printing, blanket memory artifacts occur due to incomplete evaporation of liquid carrier fluid after image transfer, leading to print quality defects and requiring expensive intensive ventilation systems to compensate for temperature loss.
Innovation Solution
A system and method that involves a blanket cycling along a path with heat applied to its external surface using a heat source located at a specific arc of the path after the second ink transfer, allowing for efficient and targeted heating without extensive ventilation systems, utilizing a combination of hardware and programming for precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intensive ventilation systems are used to compensate for temperature loss after blanket heating, then print quality is improved by preventing memory artifacts, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for intensive ventilation systems by implementing a controlled heating process that prevents memory artifacts through thermal management alone. The heating unit applies targeted heat to the blanket surface, and the blanket is intentionally allowed to cool naturally without requiring complex ventilation infrastructure, thereby removing the harmful dependency on expensive ventilation systems while maintaining print quality.
Solution Approach 2:
The patent replaces the mechanical ventilation system with a thermal field-based solution. Instead of using airflow and mechanical ventilation to manage temperature and prevent memory artifacts, the system uses controlled heating followed by natural cooling. This substitution eliminates the need for complex mechanical ventilation infrastructure while achieving the same print quality outcomes.
2Reliability
If blanket heating is applied to prevent memory artifacts, then print quality is improved, but energy consumption increases
Solution Approach 1:
The patent applies heating to the blanket surface in advance of the printing operation to establish optimal thermal conditions. By pre-heating the blanket to a controlled temperature range (60°C to 100°C) before ink transfer, the system ensures that the blanket maintains sufficient heat during the printing process, reducing the need for prolonged or intensive heating and thereby optimizing energy consumption while preventing memory artifacts.
Solution Approach 2:
The heating process is applied periodically and intermittently rather than continuously. The heating unit activates to raise the blanket temperature to the optimal range, then allows natural cooling to occur, creating a periodic heating-cooling cycle. This periodic action reduces overall energy consumption compared to continuous heating while maintaining print quality by preventing memory artifacts during the active heating phases.
3Reliability
If the blanket is heated to high temperatures to ensure complete evaporation of liquid carrier fluid, then memory artifacts are reduced, but the blanket material may deteriorate
Solution Approach 1:
The patent optimizes the heating temperature parameters to a specific range (60°C to 100°C) that is sufficient to prevent memory artifacts by controlling liquid carrier fluid behavior without causing blanket material deterioration. This parameter optimization balances the need for adequate heating to reduce memory artifacts with the constraint of preserving blanket material integrity and extending blanket lifespan.
Solution Approach 2:
The patent applies controlled heating in advance to prevent the formation of memory artifacts before they can occur during printing. By establishing optimal thermal conditions beforehand through controlled heating to the specified temperature range, the system prevents the harmful effects of incomplete carrier fluid evaporation without requiring excessive temperatures that would damage the blanket material, thereby protecting the blanket and extending its service life.
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
Significantly reduces memory artifacts, enhances image quality, and provides energy savings and extended consumables life by efficiently applying heat to the blanket surface, eliminating the need for costly ventilation systems.
Implementation Method 1
A heat source located adjacent to a third arc of the blanket path is utilized to heat an external surface of the blanket following the second transfer of the ink
Data Source
AI summary
In one example of the disclosure, a first transfer of ink is made from a photoconductor to a blanket in contact with the photoconductor. The blanket is to cycle along a path. The first transfer occurs at a first arc of the blanket path. A second transfer of the ink is made from the blanket to a media in contact with the blanket. The second transfer occurs at a second arc of the blanket path. A heat source located adjacent to a third arc of the blanket path is utilized to heat an external surface of the blanket. The heating is to occur following the second transfer of the ink.