Reel-to-Reel Laser Sintering for Etch-Free FPC Patterning
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Solution Overview
Problem
Current methods for producing flexible printed circuits (FPCs) are slow, environmentally hazardous, and costly, particularly due to the use of chemical etching and wasteful debonding processes, and do not effectively address the need for faster and more cost-effective production methods.
Innovation Solution
A reel-to-reel manufacturing method using laser ablation to create circuitry patterns on metal foils without chemical etching, combined with novel sintering and lamination processes, and a laser welding technique to produce multi-layer FPCs, which eliminates the need for chemical etching and reduces waste, enabling continuous production of single and multi-layer FPCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chemical etching is used to create circuitry patterns, then the circuitry can be formed on metal foil, but the process becomes environmentally hazardous and costly
Solution Approach 1:
The patent replaces chemical etching with laser ablation, substituting a chemical process with a physical/optical process. The laser beam directly removes material through ablation rather than chemical reaction, eliminating the need for hazardous chemicals while maintaining the ability to create precise circuitry patterns on metal foil surfaces
Solution Approach 2:
The patent changes the fundamental parameter of the material removal process from chemical reaction to thermal ablation. By controlling laser parameters (power, pulse duration, wavelength), the process achieves precise material removal without chemical byproducts, transforming the manufacturing approach from chemically-intensive to physically-based
2Ease of operation
If traditional gantry-based methods are used to produce FPC, then manual intervention is possible, but the production speed is slow
Solution Approach 1:
The patent implements a continuous reel-to-reel manufacturing process where metal foil is fed continuously through the system and processed in a single pass. The laser system operates continuously along the moving foil, eliminating the stop-and-go nature of gantry-based methods and enabling high-speed continuous production without manual intervention
Solution Approach 2:
The patent transitions from static gantry-based processing to a dynamic continuous process. The system accommodates moving foil through synchronized laser scanning and positioning, allowing the manufacturing process to adapt to continuous material flow rather than requiring stationary material handling
3Ease of manufacture
If debonding sheets are used in the manufacturing process, then metal foil can be handled, but waste material is generated
Solution Approach 1:
The patent extracts and eliminates the debonding sheet component from the manufacturing process. By designing the process to work directly with the metal foil substrate without requiring additional handling sheets, the system removes the source of waste material while maintaining adequate control and handling of the metal foil throughout processing
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 significantly enhances production speed, reduces environmental impact, and lowers costs by eliminating chemical etching and debonding processes, while maintaining the integrity and functionality of the FPCs.
Implementation Method 1
a laser ablation process to create a circuitry pattern in a reel-to-reel process
Implementation Method 2
The contemplated types of laser ablate the outer edges of the intended circuitry pattern
Implementation Method 3
laser sintering methods and devices in FPC fabrication
Data Source
AI summary
A reel-to-reel method of creating pads on a layer of metal sheet or circuitry pattern on the fly. The method includes placing a sintering paste in the intended spots for pads followed by irradiation of the sintering paste by a laser.