Inkjet 3D Printing Polyurethane via Segmented Reactive Components
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Solution Overview
Problem
Current additive manufacturing techniques, such as FDM and SLA, are limited by the materials they can use, particularly for printing high-temperature and chemically resistant three-dimensional objects, with polyurethane materials being unsuitable for high-resolution, contact-free inkjet printers due to their semi-rigid nature and solvent requirements.
Innovation Solution
The development of systems and methods for inkjet-based three-dimensional printing using a multi-part formulation of polyurethane, where printheads and nozzles eject reactive components with controlled molar ratios and patterns to achieve solidification and maximize surface interaction, allowing for the creation of a wide range of polyurethane materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyurethane is diluted with solvents at a low solid-to-solvent ratio to enable inkjet printing, then the material can be printed using inkjet technology, but it becomes infeasible to print three-dimensional and large structures
Solution Approach 1:
The polyurethane material is divided into multiple separate components (isocyanate and polyol) that are stored and deposited separately by different printheads. These components are then mixed in situ at the deposition site, allowing the material to maintain high solid content without premature reaction or solvent dilution, enabling accurate 3D structure printing.
2Manufacturing precision
If multi-part polyurethane formulations are used to achieve solidification, then solid three-dimensional objects can be formed, but precise control over molar ratios and reaction rates is required
Solution Approach 1:
The system incorporates feedback control mechanisms where the deposition parameters of each printhead are dynamically adjusted based on real-time monitoring of the reaction progress and material properties. This ensures precise maintenance of stoichiometric ratios and optimal reaction rates throughout the printing process, achieving accurate solid object formation while managing formulation complexity.
3Manufacturing precision
If reactive components are ejected with controlled molar ratios to maximize surface interaction, then solidification is achieved, but the system requires multiple printheads and nozzles for different parts
Solution Approach 1:
Multiple printheads and nozzles for different polyurethane components are integrated into a single coordinated printing system. The printheads are positioned and synchronized to deposit different components in precise patterns that maximize surface interaction area, achieving effective solidification while managing system complexity through unified control.
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
Enables the efficient fabrication of highly accurate, solid three-dimensional polyurethane objects with enhanced mechanical properties, overcoming the limitations of existing technologies by achieving precise control over material deposition and reaction rates.
Implementation Method 1
The first fluid includes a first material and the second fluid includes a second material, with the second material being configured to react with the first material to form a printed material
Data Source
AI summary
Devices and methods are described that provide printing of three-dimensional objects using reactive materials such as materials that result in a polyurethane formulation. Three-dimensional printing in accordance with the present disclosure can be performed using an inkjet printer or other systems that deposit or dispense material. A formulation made up of two or more reactive materials and, optionally, one or more UV-curable materials is also provided. The materials can be jetted based on a desired configuration to achieve a maximum reaction between materials, and can be based on desired jetting or molar ratios. By heating or applying energy on the jetted materials, their reaction and related solidifying can be accelerated. Corrective printing is also provided for, and can be used at desired intervals to eliminate printing errors relative to the object as modeled. Systems and methods used in conjunction with all of the same are provided.