3D-Printed Gel Distortion Control via Solvent Saturation
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Solution Overview
Problem
In 3D printing of gels, the exposure to ambient environment during the build process leads to differential solvent evaporation rates, causing distortion and stress in the object due to the gel's structure being partially submerged and exposed, which is not effectively addressed by existing methods.
Innovation Solution
Controlling the ambient environment by increasing the relative saturation of the solvent in the gas phase region to at least 60% through methods such as increasing vapor pressure, reducing temperature, and increasing pressure, using a conditioning unit to maintain a controlled enclosure around the object during the build process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gel is partially submerged and exposed during the build process, then the 3D printing process can be performed, but differential solvent evaporation occurs causing distortion and stress in the object
Solution Approach 1:
The patent changes the environmental parameters (temperature, pressure, humidity) of the gas phase region to control solvent evaporation. By increasing temperature, decreasing pressure, and increasing humidity, the patent creates conditions that minimize differential evaporation between submerged and exposed gel regions, thereby reducing distortion while maintaining 3D printing capability
Solution Approach 2:
The patent creates a controlled gas phase environment with high solvent saturation (inert atmosphere relative to evaporation) surrounding the build region. This controlled atmosphere prevents excessive solvent evaporation from exposed gel surfaces, maintaining uniform curing and reducing stress without interfering with the 3D printing process
2Speed
If the solvent evaporation rate is high, then the gel structure cures faster, but distortion and stress increase due to differential evaporation
Solution Approach 1:
The patent modifies environmental parameters to achieve uniform evaporation conditions. By increasing temperature, decreasing pressure, and increasing humidity simultaneously, the patent controls the evaporation rate to be sufficient for curing but uniform across all gel surfaces, preventing distortion while maintaining acceptable curing speed
Solution Approach 2:
The patent employs monitoring of environmental conditions and adjusts temperature, pressure, and humidity parameters dynamically during the build process. This feedback control ensures optimal evaporation rates are maintained throughout, balancing curing speed with shape accuracy by preventing localized evaporation differences
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 significantly reduces distortion in the 3D printed gel structures by minimizing solvent evaporation, ensuring more uniform curing and reducing stress on the object, resulting in a more accurate and stable final product.
Implementation Method 1
increasing the vapor pressure of the solvent in the gas phase region
Implementation Method 2
the exposure to ambient environment during the build process leads to differential solvent evaporation rates
Data Source
AI summary
Methods and apparatuses (400) suitable for use in 3D-printing of gels from a solution (470) comprising a polymerizable material dispersed in a solvent are described. Such methods and apparatuses (100) include features (493) to control the relative saturation of the solvent in a gas phase region around the gel during the 3D-printing process.