3D ePTFE Articles via Laser Lamination
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Solution Overview
Problem
Current 3D printing methods using poltetrafluoroethylene (PTFE) do not produce objects with the mechanical strength and microstructure provided by expanded PTFE (ePTFE), which is required for medical and life sciences applications.
Innovation Solution
An additive manufacturing process that laminates expanded polytetrafluoroethylene (ePTFE) sheets using repetitive cycles of laser cutting and bonding to create desired geometries, compatible with both manual and commercially available LOM systems, maintaining the mechanical strength and porosity of ePTFE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stereolithographic process is used to 3D print PTFE objects, then the printing process can be completed, but the mechanical strength and microstructure are insufficient compared to expanded PTFE
Solution Approach 1:
The patent changes the physical state and structure of PTFE material by using expansion processes to transform crystalline PTFE into expanded PTFE (ePTFE) with controlled porosity and mechanical properties. This parameter change allows the material to achieve both the required mechanical strength and the characteristic microstructure for medical applications while being compatible with LOM manufacturing processes.
2Reliability
If ePTFE sheets are used for LOM, then mechanical strength and porosity are maintained, but the material requires specialized handling and processing
Solution Approach 1:
The patent adapts commercially available LOM machines, originally designed for paper and other roll-to-roll processible materials, to handle ePTFE sheets. By modifying the existing LOM system to accommodate ePTFE's specific requirements while maintaining the core lamination and laser cutting functions, the patent achieves multi-functionality without requiring entirely new specialized equipment.
3Manufacturing precision
If repetitive laser cutting and bonding cycles are used, then desired geometry is achieved, but processing time increases
Solution Approach 1:
The patent implements continuous repetitive cycles of laser cutting and bonding operations without interruption to build three-dimensional ePTFE articles layer by layer. This continuous process ensures that each layer is immediately processed and bonded, maintaining geometric precision while optimizing production efficiency through uninterrupted manufacturing flow.
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 3D articles with the mechanical strength and porosity of ePTFE, suitable for medical and life sciences applications, by maintaining the material's properties throughout the printing process.
Implementation Method 1
laser cutting/bonding to produce a desired geometry
Implementation Method 2
laser cutting/bonding to produce a desired geometry
Data Source
AI summary
An additive manufacturing process is provided to produce integral 3-dimensional (3D) articles by laminating together a plurality of expanded polytetrafluoroethylene (ePTFE) membranes. The process includes repetitive cycles of ePTFE membrane lamination paired with laser cutting/bonding to produce a desired geometry based on a predefined pattern. The process may be practiced manually or may be configured to work with commercially available LOM machines/systems developed for use with other roll-to-roll processible materials, such as paper.