Reel-to-Reel Flexible Circuit Fabrication Without Chemical Etching
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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 welding method to produce multi-layer FPCs, which eliminates the need for chemical etching and reduces waste, enabling faster and more efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chemical etching is used to create circuitry patterns, then the manufacturing process is well-established, but environmental hazards increase and production costs rise
Solution Approach 1:
The patent replaces chemical etching with laser ablation, substituting a chemical process with a physical/thermal process. The laser beam directly ablates the metal foil to create circuitry patterns, eliminating the need for chemical reagents and waste disposal processes while maintaining manufacturing capability.
Solution Approach 2:
The patent changes the fundamental parameter of the manufacturing process from chemical reaction-based to thermal/physical ablation-based. By using laser energy to directly remove material through heating and vaporization, the process transforms from a wet chemical etching method to a dry thermal ablation method, resolving environmental concerns.
2Ease of operation
If traditional stop-and-go gantry methods are used to produce FPCs, then manual intervention can be applied, but production speed decreases
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 one uninterrupted flow. The laser ablation, lamination, and cutting operations all occur during continuous material movement, eliminating the stop-and-go nature of traditional gantry methods and significantly increasing production speed.
Solution Approach 2:
The patent performs preliminary actions by pre-aligning and pre-positioning multiple layers of metal foil and adhesive sheets on reels before the actual manufacturing process begins. This preliminary preparation enables the continuous processing to proceed without interruptions for alignment or positioning during production.
3Ease of manufacture
If debonding sheets are used in traditional FPC production, then layer separation is achieved, but material waste increases
Solution Approach 1:
The patent eliminates the use of sacrificial debonding sheets by implementing a direct lamination process where adhesive sheets are permanently bonded to the metal foil layers during continuous processing. The adhesive serves its purpose without requiring a separate debonding step, and no material needs to be discarded for separation purposes.
Solution Approach 2:
The patent extracts and removes the debonding sheet component from the manufacturing process entirely. By using adhesive sheets that remain permanently attached to the metal foil, the process eliminates the need for separate debonding sheets that would otherwise be used and discarded after serving their temporary separation function.
4Productivity
If reel-to-reel continuous processing is implemented, then production speed increases, but process complexity increases
Solution Approach 1:
The patent employs a laser system that performs multiple functions within a single continuous pass: ablation of circuitry patterns, cutting of metal foil, and heating for adhesive activation. This multi-functional approach consolidates what would otherwise require separate processing stations, managing complexity while maintaining high production speed.
Solution Approach 2:
The patent merges multiple discrete manufacturing operations into a single integrated reel-to-reel process flow. The laser ablation, lamination, and cutting operations are combined into one continuous processing line, eliminating the need for separate machines or workstations and managing overall system complexity through integration.
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
The method significantly reduces production time, minimizes environmental impact, and lowers costs by eliminating chemical etching and wasteful debonding processes, while enabling the efficient production of high-quality flexible printed circuits.
Implementation Method 1
a laser scanner to ablate the metal foil and thereby create a circuitry pattern
Implementation Method 2
a UV laser scanner to irradiate an area of the UV debonding sheet... thereby debonding the circuitry pattern from the UV debonding sheet
Implementation Method 3
a CO2 laser scanner to irradiate debonding residue on the circuitry pattern
Data Source
AI summary
A reel-to-reel machine to fabricate a printed flexible circuit on the fly, the machine has a plurality of reels, a laser scanner to ablate a metal foil, a source of UV light or heat to curing an adhesive in a coverlay, another source of UV light or heat to debond a sacrificial liner on the fly. There is a depositor to deposit a sintering paste on the fly onto a predetermined spot for a pad on the metal foil. Removal of slugs are also possible on the fly.