3D Printing Volumetric Solidification via Dual-Wavelength Light Intersection
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Solution Overview
Problem
Current 3D printing methods using UV curable resins face issues such as part movement during printing, resin wastage, limited resin options, reduced part fidelity, and durability concerns due to the layer-by-layer solidification process and reliance on proprietary resins.
Innovation Solution
A method and apparatus utilizing two light sources of different wavelengths to control the solidification of a curable resin within a reservoir, allowing the resin to solidify only at specific intersecting locations where both lights are present, eliminating the need for part movement and layer-by-layer indexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If layer-by-layer solidification is used, then the component can be formed sequentially, but part fidelity is reduced and printing rate is restricted
Solution Approach 1:
The patent transitions from 2D layer-by-layer solidification to 3D volumetric solidification by introducing a second light wavelength that enables curing throughout the resin volume simultaneously, eliminating the need for sequential layer indexing and improving both printing rate and part fidelity
Solution Approach 2:
The patent segments the solidification process into two distinct photopolymerization reactions triggered by different wavelengths, allowing independent control of initiation and completion stages to achieve precise 3D spatial control without mechanical indexing
2Adaptability or versatility
If UV curable resins are used, then rapid polymerization occurs, but resin options are limited to costly proprietary resins
Solution Approach 1:
The patent employs a universal photoinitiator system that responds to multiple wavelengths, enabling the use of standard, cost-effective resins rather than proprietary formulations, thereby expanding resin options while maintaining rapid curing capability
3Ease of operation
If supports are not built into the part, then part design is simplified, but tumbling or movement occurs during printing
Solution Approach 1:
The patent replaces mechanical support structures with a dual-wavelength photopolymerization field that provides intrinsic spatial control, allowing parts to be printed without supports while maintaining stability through precise optical confinement of the curing reaction
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 formation of three-dimensional components with improved fidelity and reduced resin waste by solidifying the material at precise locations, overcoming the limitations of traditional UV curing methods.
Implementation Method 1
the resin is configured to undergo a first reaction to form a first product when exposed to light of a first wavelength
Implementation Method 2
these formulae often contain photoinitiators (PIs) that, upon absorption of UV light, undergo rapid bond cleavage to generate a catalyst and initiate polymerization
Implementation Method 3
the resin is configured to undergo a second reaction to form a second product when exposed to light of a second wavelength
Implementation Method 4
The second reaction creates the second photogenerated activator
Implementation Method 5
The presence of the first and second products at a common location in the resin causes a third reaction that results in a solid polymer at the common location
Data Source
AI summary
A device and method of forming a three-dimensional component includes filling a reservoir (26) with a volume of curable resin (30), the resin configured to undergo a first reaction to form a first product when exposed to light (42) of a first wavelength and to undergo a second reaction to form a second product when exposed to light (62) of a second wavelength. The presence of the first and second products at a common location in the resin causes a third reaction that results in a solid polymer at the common location. The method further includes directing a first light source (34) of the first wavelength into the reservoir, directing a second light source (54) of the second wavelength into the reservoir such that the first and second light sources intersect at a first predetermined location (78) within the reservoir, and allowing the third reaction to form the solid polymer at the first predetermined location.