Composition-Controlled 3D Printing via Multi-Reservoir Mixing
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Solution Overview
Problem
Current 3D printing technologies using polymerization are limited in producing objects with varying compositions, resulting in 3D products with generally consistent chemical, physical, and mechanical properties, which restricts the creation of complex geometries and tailored properties within a single printing process.
Innovation Solution
A computer-controlled 3D printing method that involves mixing multiple liquid reactant compositions from separate reservoirs, controlling their mass ratio, and using photo-polymerization to deposit and solidify the mixture on a substrate, allowing for precise control of chemical, physical, and mechanical properties through flow rate, light intensity, and post-printing treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional 3D printing using polymerization is used, then the process is simple and produces consistent composition, but the ability to create objects with varying compositions and tailored properties is limited
Solution Approach 1:
The printing system is segmented into multiple independent reservoirs, each containing different liquid reactant compositions. This allows separate storage and controlled delivery of different monomers, initiators, and additives, enabling composition variation without mixing all components in a single container.
Solution Approach 2:
The system enables local quality control by independently adjusting the flow rates of different reactants to achieve spatially varying compositions within the printed object. Different regions can have tailored properties by controlling the mass ratio of reactants delivered to each location.
2Manufacturing precision
If multiple liquid reactant compositions are mixed and deposited, then composition control is improved, but the manufacturing process complexity increases
Solution Approach 1:
The system controls composition by changing flow rate parameters of individual reactants from separate reservoirs. The computer controls adjust mass ratios dynamically during printing, enabling precise composition control through parameter variation rather than physical mixing complexity.
Solution Approach 2:
A computer control system acts as an intermediary between the operator and the complex multi-reservoir mixing process. It automatically manages the coordination of multiple pumps, flow rates, and deposition parameters, simplifying the manufacturing process despite the increased system complexity.
3Productivity
If photo-polymerization is used to solidify the mixture, then the printing speed is fast, but the degree of monomer to polymer conversion must be precisely controlled
Solution Approach 1:
The photo-polymerization process uses periodic light exposure with controlled intensity and duration. By adjusting the irradiation parameters, the system achieves both fast curing speeds and precise control over the degree of monomer conversion, allowing optimization of both productivity and manufacturing precision.
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 production of 3D products with complex geometries and continuously controlled properties, including dental devices and optical components with spatially controlled optical properties, by varying reactant compositions and post-treatments, resulting in durable and biocompatible resin networks.
Implementation Method 1
operating, under control of the computer, a light source to polymerize the deposited mixed liquid reactant compositions
Data Source
AI summary
A computer-controlled method for forming a composition-controlled product using 3D printing includes disposing two or more liquid reactant compositions in respective two or more reservoirs; and mixing the two or more liquid reactant compositions, which in turn includes controlling by the computer a mass ratio of the mixed two or more liquid reactant compositions. The computer-controlled method further includes scanning, under control of the computer, a mixed liquid reactants nozzle over a substrate; depositing the mixed liquid reactant compositions onto the substrate; and operating, under control of the computer, a light source to polymerize the deposited mixed liquid reactant compositions.