3D Printing Ink Layering for Mechanical Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 3D printing methods face challenges in achieving precise coloration and mechanical integrity of printed parts, particularly due to the limitations of infrared dye-based inks which fail to generate sufficient thermal energy for proper fusion, leading to parts with reduced mechanical properties and non-uniform color.
Innovation Solution
The method employs a multi-jet fusion process using a combination of black ink as a fusing agent and white and colored inks, where the black ink absorbs radiation to generate thermal energy, causing the build material to fuse, while the white and colored inks are applied to embed color and improve mechanical properties by maintaining transparency to infrared radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If infrared dye-based inks are used for coloration, then color variety is improved, but thermal energy generation is insufficient leading to poor fusion and reduced mechanical properties
Solution Approach 1:
The patent applies composite materials by combining infrared dye-based ink with black pigment-based fusing agent in a multi-layer ink structure. The infrared dye layer provides color variety while the black pigment layer ensures sufficient thermal energy generation for proper fusion of build material, thus maintaining mechanical properties. This composite approach allows both color diversity and adequate heating function to coexist.
Solution Approach 2:
The patent segments the ink system into distinct functional layers: an infrared dye-based color layer and a black pigment-based fusing layer. This segmentation allows each layer to perform its specialized function - the color layer provides visual variety while the fusing layer generates thermal energy - resolving the contradiction between color versatility and mechanical strength.
2Strength
If black ink is used as fusing agent, then thermal energy generation and fusion quality are improved, but color uniformity deteriorates due to black color interference
Solution Approach 1:
The patent segments the ink application into separate functional layers: a black pigment layer applied first for optimal thermal energy generation and fusion, followed by a transparent or colored ink layer applied subsequently for coloration. This segmentation allows the black ink to perform its fusing function without interfering with the final color appearance, as the color layer is applied after the black layer has completed its thermal function.
Solution Approach 2:
The patent applies the black pigment-based fusing agent in a preliminary action before applying the colored ink layer. This preliminary application ensures that the build material receives adequate thermal energy for proper fusion while the subsequent colored ink layer provides the desired coloration without being affected by the black pigment, thus maintaining color uniformity.
3Manufacturing precision
If multiple inks are applied sequentially, then color quality and mechanical properties are improved, but process complexity increases
Solution Approach 1:
The patent employs a multi-functional inkjet printing system capable of applying different types of inks (infrared dye-based and black pigment-based) through the same printing apparatus. This multi-functionality allows the system to perform both coloration and fusing agent application without requiring separate equipment, thus improving color quality and mechanical properties while limiting the increase in device complexity.
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 production of 3D parts with enhanced mechanical integrity and uniform coloration, as demonstrated by increased density and resistance to bending, delamination, and scratch resistance, compared to parts made with infrared dye-based inks.
Implementation Method 1
The black ink is capable of absorbing radiation and converting the absorbed radiation to thermal energy
Implementation Method 2
converting the absorbed radiation to thermal energy, which in turn melts or sinters the build material
Implementation Method 3
causing the build material to fuse, bind, cure, etc. to form the layer of the 3D part
Data Source
AI summary
In a 3D printing method example, color is added to a part. A build material is applied, and is pre-heated to a temperature ranging from about 50 C to about 400 C. A black ink, including an infrared absorbing colorant, is selectively applied on at least a portion of the build material. A white ink, including a white colorant that is opaque in visible wavelengths and is transparent to infrared wavelengths, is selectively applied on the black ink. A colored ink, including a colorant having a color other than black or white, is selectively applied on the white ink. The build material and the applied inks are then exposed to infrared radiation. The black ink at least partially fuses the portion of the build material in contact therewith. At least some of the white colorant and the colorant are embedded in the at least partially fused portion at a surface thereof.