Print Blanket Temperature Control for Liquid Electro-Photographic Printing
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Solution Overview
Problem
Temperature overshoots during pause phases in liquid electro-photographic printing devices damage the print blanket, leading to reduced print quality and increased maintenance costs due to premature wear, as existing temperature control mechanisms are inadequate in responding to sudden changes during pause phases.
Innovation Solution
Implementing a proactive adjustment of the heating lamp's set-point within the temperature control loop to reduce the blanket temperature during pause phases, allowing for a rapid return to normal printing temperature upon resumption, thereby preventing damage and maintaining print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heating lamp maintains high temperature during pause phases, then the blanket temperature remains stable for quick resumption, but temperature overshoots damage the print blanket
Solution Approach 1:
The controller detects the pause phase trigger and proactively adjusts the heating lamp set-point before temperature overshoot can occur. By anticipating the pause phase and adjusting heating in advance, the system prevents blanket damage while maintaining rapid resumption capability through pre-conditioning the temperature control state.
Solution Approach 2:
The heating lamp set-point is dynamically adjusted based on the printing state. During pause phases, the set-point is reduced to prevent overshoot, while during active printing it returns to normal levels. This dynamic adaptation allows the system to optimize temperature control for each operational phase, preventing damage without compromising resumption speed.
2Temperature
If the heating lamp set-point is reduced during pause phases, then temperature overshoot is prevented, but the time to return to printing temperature increases
Solution Approach 1:
The temperature control system uses feedback from temperature sensors to monitor actual blanket temperature and compares it against the dynamically adjusted set-point. During pause phases, the feedback loop maintains precise temperature control at the reduced set-point, preventing overshoot while the system remains ready for rapid resumption through continuous monitoring and adaptive control.
Solution Approach 2:
The system changes the temperature set-point parameter based on operational phase. During pause phases, the set-point is temporarily reduced to prevent overshoot and damage. The controller seamlessly transitions between different set-point values, maintaining precise temperature control while optimizing for both blanket protection and rapid resumption capability.
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 effectively prevents temperature overshoots during pause phases, extending the lifespan of the print blanket, improving print quality, and reducing maintenance costs by ensuring consistent temperature control without increasing the time required to resume printing.
Implementation Method 1
a heating lamp to heat the print blanket and prepare the ink image for transfer to a print media
Implementation Method 2
an ink image developed on the photoconductive drum is offset to an image transfer element, where it is heated until the solvent evaporates and the resinous colorants melt
Data Source
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AI summary
In an example, a method of controlling the temperature of a print blanket within a printing device includes printing a print job. During the printing, a pause phase start trigger is sensed. In response to sensing the pause phase start trigger, a set-point of a print blanket heating lamp is changed from a print set- point to a pause set-point to control the print blanket temperature during the pause phase.