Reel-to-Reel FPC Lamination 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 in the electric vehicle industry.
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 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 to create circuitry patterns on metal foil. The laser beam physically removes material through ablation rather than chemical dissolution, eliminating the need for hazardous chemicals while maintaining the ability to form precise circuitry patterns on the metal foil substrate
Solution Approach 2:
The patent changes the fundamental parameter of material removal from chemical dissolution to thermal ablation. By using laser energy to heat and vaporize metal foil material directly, the process transforms from a chemical-based system to a thermal-physical system, achieving pattern formation without environmental hazards
2Ease of manufacture
If traditional gantry methods are used to produce FPC, then the manufacturing process can be implemented, but the production speed is slow and requires manual intervention
Solution Approach 1:
The patent implements a continuous reel-to-reel manufacturing process where metal foil is fed continuously through the system and processed without stopping. The laser ablation, lamination, and other manufacturing steps occur in continuous sequence as the material moves through the system, eliminating the stop-and-go nature of traditional gantry methods and enabling high-speed production
Solution Approach 2:
The patent performs preliminary actions by pre-aligning and pre-positioning multiple layers of metal foil and substrate materials on reels before the actual manufacturing process begins. This preliminary preparation enables the continuous processing to proceed without manual intervention or stopping for repositioning, thereby increasing production speed
3Ease of manufacture
If debonding sheets are used in the manufacturing process, then metal foil can be processed, but wasteful use of debonding sheets occurs
Solution Approach 1:
The patent implements a system where debonding sheets are selectively discarded only in the specific areas where circuitry patterns need to be formed, while the remaining portions of the debonding sheet are recovered and reused for subsequent processing steps. This selective discarding approach minimizes waste compared to traditional methods where entire debonding sheets are discarded
Solution Approach 2:
The patent extracts and removes only the necessary portions of the debonding sheet that correspond to the circuitry pattern areas, leaving the rest of the debonding sheet intact for reuse. This selective extraction approach reduces material waste while maintaining the functionality needed for metal foil processing
4Productivity
If reel-to-reel manufacturing is implemented, then production speed increases, but new challenges in precision and quality control arise
Solution Approach 1:
The patent incorporates feedback mechanisms where sensors continuously monitor the position, alignment, and quality of the circuitry patterns being formed during the reel-to-reel process. This real-time feedback allows for immediate adjustments to laser parameters, material feed rate, and positioning to maintain precise circuitry patterns despite the high-speed continuous manufacturing
Solution Approach 2:
The patent replaces mechanical positioning and alignment systems with laser-based direct writing and digital control systems. The laser can be precisely controlled to ablate material at exact positions on the moving metal foil, and digital control algorithms compensate for any variations in material speed or positioning, maintaining precision without complex mechanical alignment mechanisms
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 processes, while enabling the production of high-quality flexible printed circuits suitable for the electric vehicle industry.
Implementation Method 1
a novel 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 as the metal foil passes reel-to-reel under a laser scanner
Implementation Method 3
combined with novel sintering and lamination processes
Implementation Method 4
combined with novel sintering and lamination processes
Implementation Method 5
and a welding method to produce multi-layer FPCs
Data Source
AI summary
A reel-to-reel lamination method to laminate a metal foil or circuitry pattern on the fly. The method includes applying a UV laminate or thermoset laminate to the metal foil or the circuitry pattern reel to reel, and then apply a UV radiation or heat to the laminate. There can be an optional enclosure connected to a suction source. The enclosure can have a flexible bladder that physically compresses the laminate.