Dual-Layer 3D Printed Polymer Structure for Interlayer Bond Strength
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Solution Overview
Problem
Conventional 3D printing technologies, such as fused filament fabrication (FFF), face limitations in achieving high z-direction strength due to poor inter-laminar bond strength between layers, which restricts their use in engineering applications, and existing solutions often require specialized hardware or post-processing that complicates geometric accuracy and scalability.
Innovation Solution
A dual-material approach where a high glass transition temperature (Tg) thermoplastic polymer forms a supporting shell around a low Tg polymer core, allowing for thermal annealing between their Tg values to enhance inter-laminar strength without distorting the part geometry, using a solvent to remove the shell if necessary, and employing a multi-component filament structure for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal annealing is performed to improve interlayer bond strength, then z-direction strength is improved, but part geometry becomes distorted
Solution Approach 1:
The patent divides the polymer structure into two distinct segments: a core polymer that undergoes annealing to improve interlayer bonds, and a shell polymer that maintains geometric stability during annealing. This segmentation allows each material to perform its specific function without compromising the other.
Solution Approach 2:
Different regions of the polymer structure are assigned different properties: the core region is designed with low Tg for annealing responsiveness, while the shell region uses high Tg material for dimensional stability. This local differentiation enables simultaneous achievement of bond strength improvement and geometry preservation.
2Ease of manufacture
If conventional FFF process is used to reduce manufacturing cost, then device cost is reduced, but interlayer bond strength becomes insufficient
Solution Approach 1:
The patent changes the material parameter (introducing dual polymers with different Tg values) rather than changing the process equipment or complex post-processing steps. This allows conventional FFF printers to achieve enhanced bond strength through material selection and controlled annealing parameters.
Solution Approach 2:
The invention uses a composite material system consisting of two different thermoplastic polymers with complementary properties. The core polymer provides annealing capability while the shell polymer provides structural integrity, creating a composite that overcomes the limitations of single-material FFF printing.
3Manufacturing precision
If high Tg shell polymer is added around low Tg core polymer, then geometric stability during annealing is improved, but device complexity increases
Solution Approach 1:
The dual-polymer filament serves multiple functions simultaneously: the core polymer enables interlayer bond strengthening through annealing, while the shell polymer maintains geometric stability. This multi-functionality is achieved within a single filament structure that can be processed by conventional printers.
Solution Approach 2:
The patent implements a nested structure where the low Tg core polymer is enclosed within the high Tg shell polymer, similar to nested dolls. This nested configuration allows the inner core to undergo thermal processing while the outer shell protects the overall geometry.
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 method significantly improves the interlayer mechanical performance of 3D printed parts, transforming brittle interfaces into tough ones with extensive plastic deformation, while maintaining the original geometry and allowing for cost-effective, robust, and scalable manufacturing.
Implementation Method 1
The first thermoplastic polymer may be configured to be removed from the second thermoplastic polymer by exposure to a selective solvent that does not degrade the second thermoplastic polymer
Implementation Method 2
allowing for thermal annealing between their Tg values to enhance inter-laminar strength
Implementation Method 3
rptation forms a strong weld where the layers are in contact
Data Source
AI summary
A polymer body includes a first thermoplastic polymer, and a second thermoplastic polymer. The first thermoplastic polymer and the second thermoplastic polymer form a continuous solid structure. The first thermoplastic polymer forms an external supporting structure that at least partially envelops the second thermoplastic polymer. A first flow temperature of the first thermoplastic polymer is at least 10° C. higher than a second flow temperature of the second thermoplastic polymer. The first thermoplastic polymer may be removable by exposure to a selective solvent.