FEAM Process for Embedding 3D Circuitry in Additive Manufacturing
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Solution Overview
Problem
Current additive manufacturing techniques are limited in their ability to produce functional electromechanical devices with integrated conductive and dielectric materials, particularly due to challenges in interlayer connectivity, high electrical resistance, mechanical weakness, and the need for separate steps in depositing conductive materials, which restrict the creation of complex 3D structures with embedded circuitry.
Innovation Solution
The Fiber Encapsulation Additive Manufacturing (FEAM) process involves co-depositing a fiber and an extrudable material, allowing for the simultaneous encapsulation of conductive wires or filaments within a polymer matrix, enabling the creation of complex 3D structures with embedded circuitry and mechanical components, such as actuators, sensors, and thermal management structures, through a layer-by-layer additive manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate steps are used to deposit conductive materials on external surfaces, then conductive traces can be formed, but the process is not fully automated and cannot create truly 3-D embedded circuitry
Solution Approach 1:
The patent combines multiple deposition functions into a single integrated nozzle system that can simultaneously deposit dielectric materials, conductive materials, and magnetic materials in one additive manufacturing process, eliminating the need for separate post-processing steps and enabling true 3-D embedded circuitry
Solution Approach 2:
The nozzle system is designed with multi-functionality to perform various deposition operations (dielectric, conductive, magnetic material deposition) through a single device, allowing automated fabrication of complex electromechanical structures with embedded circuitry without requiring multiple specialized equipment
2Reliability
If solder is used as conductive material, then electrical connections can be made, but the electrical resistance is 22 times higher than annealed copper
Solution Approach 1:
The patent changes the material parameter by using pure metal filaments (copper, aluminum, silver) with inherently low electrical resistance instead of solder alloys, dramatically reducing electrical resistance while maintaining connection reliability through the additive manufacturing process
3Strength
If Bi58Sn42 solder is used for low melting point connections, then joining can be achieved, but mechanical weakness and brittleness are common
Solution Approach 1:
The patent employs composite material strategies by combining metal filaments with polymer matrices or using metal-mesh reinforcements within the printed structure, creating composite constructs that simultaneously achieve strong joints and high mechanical integrity without relying on brittle solders
4Productivity
If polymer and metal are dispensed from separate nozzles, then multi-material structures can be formed, but throughput is reduced due to lack of integration
Solution Approach 1:
The patent merges multiple material deposition functions into a single integrated nozzle system that can switch between or simultaneously deposit different materials (polymers, metals, conductive inks), dramatically improving fabrication throughput while managing complexity through unified control architecture
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
FEAM enables the automated fabrication of multi-material, multi-functional components with embedded 3D circuitry, reducing assembly needs and costs, while increasing reliability and quality, and allowing for the production of complex geometries and distributed actuation in robots and other devices.
Implementation Method 1
a multi-material additive manufacturing process comprising: extruding an extrudable material through a nozzle capable of moving along one or more axis
Implementation Method 2
concurrently dispensing one or more filaments, wherein the filament is encapsulated within or on an extrudate extruded from the nozzle
Data Source
AI summary
An apparatus for segmenting and feeding a fiber includes at least one capillary having a lumen therethrough configured to deliver a fiber segment. An advancing advances a fiber through the capillary. Tensioning means applies tension to the fiber to induce it to break. Damaging means locally damages the fiber.