Pulsed Xenon Flash Lamp Curing Low-Temperature Substrates
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Solution Overview
Problem
The challenge is to efficiently cure thin films on low-temperature substrates such as paper or polymer, which require longer curing times due to their lower temperature of decomposition, making high-volume, low-cost production of printed electronic circuits economically unattractive.
Innovation Solution
A curing apparatus that uses a high-intensity pulsed xenon flash lamp synchronized with the movement of the substrate, combined with a thermal barrier layer and cooling mechanisms, to rapidly and uniformly cure thin films by controlling the power, duration, and repetition rate of light pulses, while maintaining the substrate within safe temperature limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional oven curing is used on low-temperature substrates, then the substrate temperature remains within safe limits, but the curing time becomes excessively long
Solution Approach 1:
The patent applies periodic pulsed illumination instead of continuous heating. The strobe lamp delivers high-intensity light pulses at controlled repetition rates, allowing the thin film to absorb energy and cure during each pulse while the substrate has time to cool between pulses. This periodic action enables rapid curing without exceeding the substrate's maximum temperature tolerance.
Solution Approach 2:
The patent uses a strobe control module to synchronize the pulsed illumination with the substrate movement and pre-establish safe operating parameters. The system pre-calculates the optimal pulse duration, repetition rate, and intensity based on the substrate's thermal properties, ensuring that curing occurs rapidly within safe temperature limits before the substrate moves out of the illumination zone.
2Productivity
If high-intensity continuous illumination is used to reduce curing time, then curing speed increases, but the substrate temperature exceeds safe limits
Solution Approach 1:
The system uses high-intensity light pulses delivered periodically rather than continuous illumination. Each pulse provides sufficient energy for rapid curing of the thin film, while the intervals between pulses allow heat to dissipate from the substrate, preventing temperature accumulation and maintaining the substrate within safe temperature limits throughout the curing process.
Solution Approach 2:
The patent implements dynamic control of the strobe lamp parameters including pulse duration, repetition rate, and intensity. The conveyor control module and strobe control module work together to dynamically adjust these parameters based on substrate speed and material properties, optimizing the balance between curing speed and temperature control for maximum productivity without exceeding thermal limits.
3Temperature
If pulsed illumination is used to maintain substrate temperature, then temperature control improves, but curing uniformity may be compromised
Solution Approach 1:
The patent achieves continuous effective curing action through high-frequency pulsed illumination. The strobe lamp operates at repetition rates that create overlapping thermal zones on the moving substrate, ensuring that each point on the thin film receives multiple pulses during its passage through the illumination zone. This continuous action maintains uniform curing across the entire substrate surface while preserving temperature control through the pulsed nature of the illumination.
Solution Approach 2:
The system dynamically changes illumination parameters including pulse width, repetition rate, and intensity distribution across the substrate surface. By adjusting these parameters based on substrate material properties and processing speed, the system optimizes both temperature control and cure uniformity, ensuring consistent manufacturing quality while maintaining the substrate within safe temperature limits.
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 approach allows for rapid curing of thin films on low-temperature substrates at high speeds, achieving a uniform cure comparable to conventional oven curing but in a fraction of the time, thereby enhancing the economic viability of printed electronic circuits on these materials.
Implementation Method 1
a strobe head, a sensor, a strobe control module and a conveyor control module. The strobe control module controls the power, duration and repetition rate of a set of pulses generated by a flash lamp on the strobe head
Implementation Method 2
This approach allows for rapid curing of thin films on low-temperature substrates at high speeds, achieving a uniform cure comparable to conventional oven curing but in a fraction of the time
Implementation Method 3
combined with a thermal barrier layer and cooling mechanisms, to rapidly and uniformly cure thin films by controlling the power, duration, and repetition rate of light pulses, while maintaining the substrate within safe temperature limits
Data Source
AI summary
A composite film is disclosed. The composite film includes a substrate, a thermal barrier layer located on top of the substrate, wherein the thermal barrier layer has a higher decomposition temperature than the substrate, and a thin film located on top of the thermal barrier layer, wherein the thin film is to be thermally processed by a pulsed light from a flashlamp.