3D Printing Fusing Agent Color Control via CTO Nanoparticles
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Solution Overview
Problem
Current 3D printing techniques using Multi Jet Fusion (MJF) face challenges in achieving color variation while maintaining mechanical integrity, as fusing agents tend to produce strongly colored parts due to high absorption in the visible spectrum, limiting the range of colors that can be produced.
Innovation Solution
The use of a low tint fusing agent, such as stabilized cesium tungsten oxide (CTO) nanoparticles, which absorbs radiation in the near-infrared spectrum and is transparent in the visible spectrum, allowing for the production of white or lightly colored parts, and the combination of core and low tint fusing agents to achieve both mechanical integrity and color variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional fusing agents with high visible spectrum absorption are used, then mechanical integrity is achieved, but color variation is limited and parts appear strongly colored
Solution Approach 1:
The patent segments the fusing agent into two distinct types: a core fusing agent containing carbon black for mechanical integrity, and a low-tint fusing agent for color control. These are applied in separate sequential steps, allowing independent optimization of each function without compromise
Solution Approach 2:
The patent applies different fusing agents to different regions of the build material layer. The core fusing agent is applied where mechanical strength is needed, while the low-tint fusing agent is applied where color control is prioritized, enabling spatial differentiation of material properties
2Strength
If core fusing agent is applied to ensure mechanical strength, then part strength is improved, but the parts become strongly colored (black)
Solution Approach 1:
The patent extracts the color-generating function from the mechanical fusing function by separating carbon black (core fusing agent) from the low-tint fusing agent. This allows the harmful coloration effect to be removed while preserving the beneficial mechanical strengthening effect
Solution Approach 2:
The patent uses a composite approach by combining two different fusing agents with distinct properties: carbon black-based core fusing agent for strength, and low-tint fusing agent for color control. This composite strategy enables simultaneous achievement of mechanical integrity and aesthetic quality
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 enables the creation of 3D parts with improved mechanical properties and a wider range of colors, including white and other colors beyond black, by selectively applying fusing agents to achieve desired color and strength profiles within the printed parts.
Implementation Method 1
The fusing agent is capable of absorbing radiation and converting the absorbed radiation to thermal energy, which in turn melts or sinters the build material that is in contact with the fusing agent
Implementation Method 2
a low tint fusing agent, such as stabilized cesium tungsten oxide (CTO) nanoparticles, which absorbs radiation in the near-infrared spectrum and is transparent in the visible spectrum
Data Source
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AI summary
In an example of a three-dimensional printing method, a polymeric build material is applied. A fusing agent is selectively applied on at least a portion of the polymeric build material. The fusing agent includes cesium tungsten oxide nanoparticles, a zwitterionic stabilizer, and an aqueous vehicle. The polymeric build material is exposed to electromagnetic radiation to fuse the portion of the polymeric build material in contact with the fusing agent to form a layer.