Air-Permeable Build Platform for Void-Free 3D Printing
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Solution Overview
Problem
Air entrapment during additive manufacturing processes leads to voids in 3D printed objects, degrading mechanical, thermal, and electrical properties, and reducing the performance of the finished product.
Innovation Solution
An air-permeable platform and vacuum system are used to draw out trapped air from the build material, providing an escape route for displaced air and preventing void formation, while also enhancing evaporation rates of liquid carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional additive manufacturing processes are used without air removal mechanisms, then the manufacturing process is simple, but air entrapment occurs leading to voids that degrade mechanical, thermal, and electrical properties
Solution Approach 1:
The build platform is designed with porous or permeable material that allows air to pass through during the additive manufacturing process. This porous structure enables air removal while maintaining platform functionality, directly addressing the void formation problem without requiring complex external air extraction systems
Solution Approach 2:
Air is actively extracted from the build material during the manufacturing process by applying vacuum or pressure differential through the porous platform. This extraction of the harmful element (air) prevents void formation and improves product reliability while integrating the air removal function into the platform itself rather than adding separate complex systems
2Manufacturing precision
If air is removed during the additive manufacturing process, then void formation is reduced improving product quality, but the device complexity increases due to vacuum systems and permeable platforms
Solution Approach 1:
The air removal function is merged with the build platform by making the platform itself porous or permeable. This combines the structural support function of the platform with the air extraction function, eliminating the need for separate air removal devices and reducing overall system complexity while improving manufacturing precision
Solution Approach 2:
The porous platform acts as an intermediary between the build material and the vacuum source. It facilitates air removal through its porous structure while protecting the vacuum system from direct contact with build material particles, thus achieving precise void control without requiring complex particle filtration systems
3Ease of manufacture
If liquid carriers are used in build material, then material deposition is improved, but evaporation time increases reducing productivity
Solution Approach 1:
Air removal is performed continuously during the material deposition and evaporation process through the porous platform. This continuous air extraction accelerates solvent evaporation by maintaining concentration gradients, allowing faster processing while preserving the benefits of liquid carrier-based material deposition
Solution Approach 2:
The porous platform changes the physical parameters of the evaporation process by increasing surface area for evaporation and maintaining concentration gradients through continuous air removal. This accelerates the evaporation rate, improving productivity without compromising the quality of material deposition that liquid carriers provide
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 solution reduces voids in 3D printed objects, improving mechanical and electrical performance, and increases throughput by accelerating evaporation rates.
Implementation Method 1
a source that applies a vacuum to an underside of the porous substrate platen such that the vacuum permeates through the pores of the platen
Implementation Method 2
the vacuum permeates through the pores of the platen
Data Source
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AI summary
In one example in accordance with the present disclosure, an additive manufacturing stage is described. The additive manufacturing stage includes a bed to define a volume where a three-dimensional object is to be formed. The additive manufacturing stage also includes an air-permeable platform on which build material is deposited. A vacuum system draws air resident in the build material down through the air-permeable platform.