Adjustable Reflective Element for Radiant Heat Control
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Solution Overview
Problem
Conventional radiant drying systems for print media face challenges in precisely controlling the amount and location of heat applied, leading to issues such as smearing, scorching, and curling due to variations in web characteristics and speed, which existing technologies struggle to address effectively.
Innovation Solution
Incorporating a reflective element that dynamically transitions between reflective and transparent states to control the amount and location of radiant heat, allowing for precise heat control by adjusting its reflectivity based on input from a controller, thereby optimizing heat application on the web.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional radiant heat lamps are used to dry ink on web, then drying function is provided, but precise control over heat amount and location is difficult achieving
Solution Approach 1:
The patent applies the dynamics principle by making the reflective element adjustable between different positions and orientations. The reflective element can be dynamically repositioned using actuators (such as linear actuators or rotary actuators) to change the direction and intensity of reflected radiant heat, enabling precise control over heat distribution across the web surface without requiring multiple fixed heat sources.
Solution Approach 2:
The patent uses a reflective element as an intermediary between the radiant heat source and the web. This reflective element acts as a mediator that can redirect, concentrate, or distribute radiant heat energy to specific areas of the web, providing precise spatial and intensity control of heat application without directly modifying the heat source itself.
2Adaptability or versatility
If fixed radiant heat lamps are used, then simple dryer structure is maintained, but adaptability to different web characteristics and speeds is poor
Solution Approach 1:
The reflective element is made adjustable to adapt to different web characteristics and speeds. The system can dynamically reposition the reflective element to optimize heat distribution for various web types, ink formulations, and web speeds, providing versatility without requiring multiple dedicated drying systems for different conditions.
Solution Approach 2:
The system enables parameter changes by adjusting the position, orientation, and shape of the reflective element to modify heat distribution parameters. This allows the dryer to adapt to different operating conditions (web speed, ink type, ambient temperature) by changing the reflective element's configuration rather than replacing entire heating systems.
3Productivity
If high heat is applied to dry ink quickly, then productivity is improved, but scorching and curling defects occur
Solution Approach 1:
The reflective element can be positioned and shaped to provide non-uniform heat distribution across the web surface. Different areas of the web receive different amounts of heat based on local requirements - areas requiring faster drying receive more heat, while sensitive areas receive less heat, preventing scorching and curling while maintaining overall productivity.
Solution Approach 2:
The system applies heat selectively to only those areas of the web that require drying, rather than uniformly heating the entire web surface. The reflective element directs radiant heat precisely where needed, avoiding excessive heat application to areas that don't require drying, thus preventing defects while maintaining efficient drying where required.
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 enables precise control over heat distribution, reducing deformities caused by under or over heating, and enhances print quality by allowing for adaptive and granular heat management, eliminating the need for frequent adjustments in lamp output and orientation.
Implementation Method 1
A reflective element is placed in the dryer between a radiant heat source and a web... To decrease the level of heat at the web surface, the reflective element is driven toward a reflective state
Implementation Method 2
To increase the level of heat at the web surface, the reflective element is driven toward a transparent state
Implementation Method 3
A radiant dryer, installed downstream from the printer, may assist in drying the wet ink on the web... A typical radiant dryer includes an array of radiant heat lamps
Data Source
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AI summary
Systems and methods are provided for improved radiant heat control within a dryer of a printing system with reflective elements. One embodiment is a dryer of a printing system. The drying includes a radiant energy source configured to apply heat to a print medium. The dryer also includes a reflective element installed between the radiant energy source and the print medium. The reflective element is configured to have varying levels of reflectance. The dryer also includes a controller configured to determine an amount of heat to supply to a region of the print medium, and to adjust an amount of reflectance of the reflective element based on the determined amount of heat.