3D Printer Build Material Permeability Control for Recycled Powder Flow
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Solution Overview
Problem
3D printing technologies face challenges in efficiently utilizing recycled build material due to issues like tribocharging and clumping, which affect the flow and quality of the material during the printing process.
Innovation Solution
A 3D printer system that monitors and adjusts the permeability of the build material by applying a gas with controlled flow rates and humidity levels, preventing tribocharging and ensuring free flow of material through the use of pressure sensors and a humidifying system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If recycled build material is reused in 3D printing, then material cost is reduced and sustainability is improved, but tribocharging and clumping occur which deteriorate material flow and print quality
Solution Approach 1:
The system performs preliminary actions by monitoring permeability before printing and adjusting humidity levels in advance to prevent tribocharging and clumping. The humidifying system is activated beforehand to modify material properties, ensuring proper flow characteristics before the actual printing process begins.
Solution Approach 2:
The system continuously monitors build material permeability using pressure sensors and uses this feedback to dynamically adjust humidity levels. The controller receives permeability data and automatically modifies humidifying system operation to maintain optimal material flow properties throughout the printing process.
2Ease of operation
If gas flow rate is increased to prevent clumping, then material flow improves, but fluidization occurs which disrupts material stability
Solution Approach 1:
The system dynamically adjusts gas flow rates based on real-time permeability monitoring. Rather than using a fixed high flow rate, the controller continuously modifies the gas flow to maintain optimal material flowability while preventing fluidization. This dynamic adjustment allows the system to respond to changing material conditions and maintain stability.
Solution Approach 2:
The system changes physical parameters by adjusting humidity levels and gas flow rates to modify material properties. By controlling the humidity content of the build material, the system alters the material's electrostatic properties and flow characteristics, enabling proper flow without requiring excessive gas flow that would cause fluidization.
3Manufacturing precision
If permeability monitoring and humidifying systems are added, then material flow control and quality are improved, but device complexity increases
Solution Approach 1:
The system achieves multi-functionality by using the same gas delivery infrastructure for both permeability monitoring and humidifying purposes. The pressure sensors serve dual roles in detecting both material presence and permeability characteristics. This universal approach allows the system to perform multiple functions without proportionally increasing complexity.
Solution Approach 2:
The system employs self-service mechanisms where the build material itself provides the sensing function through its permeability characteristics. The material's natural response to gas flow and humidity changes provides feedback information that the system uses to automatically adjust processing parameters, reducing the need for additional complex sensing and control systems.
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 allows for the effective use of recycled material by reducing tribocharging and clumping, ensuring consistent material flow and improving the quality of the printed objects.
Implementation Method 1
a controller that monitors and adjusts a permeability of the build material by applying a gas with at least one flow rate to a vessel of the three dimensional printer
Implementation Method 2
applying the gas with a predetermined humidity level at a second flow rate to modify the permeability of the build material
Implementation Method 3
the permeability is calculated based on a plurality of pressure values detected by a plurality of pressure sensors residing in the vessel
Data Source
AI summary
A system for manufacturing three dimensional objects can include logic to apply a gas with at least one flow rate to a vessel of a three dimensional printer. The logic can also detect a permeability of a build material residing within the vessel, wherein the permeability is calculated based on a plurality of pressure values detected by a plurality of pressure sensors residing in the vessel, and apply the gas with a predetermined humidity level at a second flow rate to modify the permeability of the build material residing in the vessel. Furthermore, the logic can initialize manufacturing a three dimensional object with the build material in response to detecting the permeability of the build material is below a predetermined threshold.