3D Printing Support Material Using Cellulose Ether and Vinyl Pyrrolidone
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Solution Overview
Problem
Current 3D printing technologies face challenges with support materials that are difficult to print, have poor adhesion to build materials, and are sensitive to moisture, particularly when printing objects with overhangs or complex geometries, as existing materials like PVA require additives and are not easily removable at room temperature.
Innovation Solution
A support material blend comprising cellulose ethers, such as hydroxypropyl cellulose and ethyl cellulose, combined with vinyl pyrrolidone polymers, which can be formulated to improve adhesion, printability, and dissolution at room temperature without the need for substantial additives, allowing for better support of overhanging features and easy removal post-printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PVA is used as support material, then it can be dissolved in warm water, but it is difficult to print and does not sufficiently adhere to ABS
Solution Approach 1:
The patent uses composite materials by combining cellulose ether and vinyl pyrrolidone polymer in specific ratios to create a support material that achieves both good adhesion to build materials and easy dissolution at room temperature, resolving the contradiction between printability and dissolution capability
Solution Approach 2:
The patent changes the chemical composition parameters by selecting specific cellulose ethers (with particular degree of substitution and viscosity ranges) and vinyl pyrrolidone polymers (with specific molecular weights) to optimize both adhesion properties and dissolution behavior, eliminating the need for warm water dissolution
2Ease of operation
If PVA is used as support material, then it can be removed after printing, but it is highly sensitive to moisture
Solution Approach 1:
The patent changes the chemical composition by using cellulose ether-vinyl pyrrolidone blends with specific ratios and molecular weights, which reduces moisture sensitivity while maintaining easy removability through dissolution at room temperature, eliminating the harmful moisture sensitivity of PVA
3Reliability
If known supporting materials are used, then they can provide support for overhangs, but they require substantial amount of additives such as plasticizers
Solution Approach 1:
The patent creates a composite material system where cellulose ether and vinyl pyrrolidone polymer work synergistically to provide both support function and inherent printability without requiring substantial additives, simplifying the material composition while maintaining reliability
Solution Approach 2:
The support material is designed as a disposable sacrificial material that can be easily removed after serving its support function, and the simplified composition without substantial additives reduces complexity while maintaining the temporary support role
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
The cellulose ether and vinyl pyrrolidone polymer blend provides improved adhesion to build materials, enhanced printability, and efficient dissolution at room temperature, addressing the limitations of existing support materials by offering better support for complex geometries and easier removal without the need for elevated temperatures.
Implementation Method 1
The PVA is dissolved in warm water and leaves the ABS portion of the printed article intact... efficient dissolution at room temperature
Data Source
AI summary
The present disclosure relates generally to a support material for three-dimensional printing comprising a blend of at least two cellulose ethers or a blend of at least one cellulose ether and at least one vinyl pyrrolidone polymer. Additionally, the present disclosure relates to a shaped material and a three-dimensionally printed object comprising the support material. Furthermore, a process for producing a three-dimensional object using the support material is also disclosed.