4D Printing Thermal Anisotropy Standard FDM
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Solution Overview
Problem
Current 4D printing methods require dedicated 3D printers and smart materials, limiting their commercial viability and flexibility, especially due to the need for materials with high glass transition temperature differences and the requirement for specialized equipment.
Innovation Solution
A 4D printing method utilizing thermal anisotropy and thermal transformation, where thermoplastic polymers are printed with specific path orientations to create anisotropic layers, allowing for thermal transformation without dedicated equipment or materials, using a general FDM printer and thermoplastic filaments, and controlling heating to achieve a desired final shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated 3D printers and smart materials are used for 4D printing, then transformation performance is improved, but device complexity and material cost increase
Solution Approach 1:
The patent changes the printing parameters (printing paths, layer orientations, deposition patterns) rather than changing the fundamental printing technology. By carefully controlling the orientation and arrangement of printed layers, the patent creates anisotropic thermal expansion properties in conventional materials, enabling 4D printing functionality without requiring specialized 4D printers or smart materials.
Solution Approach 2:
The patent applies different printing paths and layer orientations to different regions of the printed object. By creating local variations in layer arrangement and density, the patent generates localized anisotropic properties that guide thermal transformation in specific directions, allowing complex transformation patterns using standard printing equipment.
2Reliability
If materials with high glass transition temperature difference are used, then shape memory effect is improved, but material selection and cost increase
Solution Approach 1:
Instead of relying on materials with extreme temperature differences, the patent changes the structural parameters of the printed object (layer orientations, printing paths, anisotropic arrangements) to enhance the shape memory effect. This approach allows using conventional thermoplastics with standard temperature ranges while achieving effective thermal transformation through controlled anisotropic structure.
3Device complexity
If conventional 3D printers and materials are used, then device complexity and cost decrease, but manufacturing precision of anisotropic structure decreases
Solution Approach 1:
The patent incorporates the anisotropic structure design directly into the 3D printing process planning stage. By pre-calculating and programming the printing paths, layer orientations, and deposition patterns before printing begins, the patent ensures that the anisotropic structure is built in during manufacturing rather than requiring post-processing, thereby maintaining precision with conventional equipment.
4Shape
If thermal transformation is performed, then shape transformation is achieved, but heating time increases
Solution Approach 1:
The patent creates localized anisotropic regions with optimized thermal properties through specific printing patterns. These locally optimized structures facilitate more efficient and uniform heat distribution during thermal transformation, reducing the overall heating time required to achieve the desired shape change while maintaining transformation effectiveness.
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 4D printed products with desired shapes at lower costs, using common materials and equipment, and reduces heating time, allowing for non-reversible transformations and broader industrial applications.
Implementation Method 1
artificially planning transverse printing paths and longitudinal printing paths on a specimen to impose a desired thermal anisotropy to the specimen
Implementation Method 2
heating the 3D printed product to cause thermal transformation of the 3D printed product in a specific direction
Data Source
AI summary
Disclosed are a 4D printing method using thermal anisotropy and thermal transformation, and the resulting product. The method includes (a) artificially planning transverse printing paths and longitudinal printing paths on a specimen to impose a thermal anisotropy to the specimen, (b) sequentially and alternately forming transversely printed layers and longitudinally printed layers on the specimen by printing a thermoplastic polymer in transverse and longitudinal directions to build a 3D printed product, (c) heating the 3D printed product so that the 3D printed product thermally transforms in a specific direction, and (d) controlling heating time to obtain a 4D printed product having a desired final shape which is formed through the transformation of the 3D printed product over the heating time.