Polymeric Powder Morphology Control via Yarn Segmentation
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Solution Overview
Problem
Current methods for producing consumable powders for additive manufacturing systems like Selective Laser Sintering (SLS) and High Speed Sintering lack precise control over particle morphology, leading to inconsistent melting times and temperatures, which affects the uniformity and strength of the final product.
Innovation Solution
A method involving the formation of a consumable polymeric powder mixture by aggregating and cutting polymeric yarns into particles, allowing for controlled particle morphology through specific cutting intervals and processing techniques, such as using blades or jets, to create uniform polymeric particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If crushing or grinding large polymer pellets is used to produce consumable powders, then production cost is reduced, but particle morphology control precision deteriorates
Solution Approach 1:
The invention segments the polymer processing into distinct stages: forming yarns from polymer material, aggregating yarns into tows, and then cutting tows into particles. This segmentation allows each stage to be optimized independently, achieving both cost-effectiveness and precise particle morphology control that cannot be obtained through simple crushing or grinding of pellets.
Solution Approach 2:
The invention performs preliminary actions by first forming polymer yarns and aggregating them into tows before cutting into particles. This preliminary structuring of the polymer material enables subsequent cutting operations to produce particles with consistent and controlled morphology, avoiding the need for expensive post-processing adjustments.
2Ease of manufacture
If crushing or grinding large polymer pellets is used to produce consumable powders, then production cost is reduced, but melting time and temperature uniformity deteriorates
Solution Approach 1:
By segmenting the polymer into yarns and then into controlled particles through the tow cutting process, the invention ensures uniform particle size and morphology. This uniformity directly translates to consistent melting behavior during additive manufacturing, eliminating the variability inherent in crushed or ground pellets while maintaining cost-effectiveness.
Solution Approach 2:
The invention changes the fundamental parameters of particle formation by using controlled cutting of aggregated yarns rather than mechanical crushing. This parameter change from random size reduction to controlled dimensional cutting ensures uniform melting characteristics while keeping production costs low.
3Manufacturing precision
If precise control of particle morphology is achieved through advanced techniques, then melting process uniformity is improved, but production cost increases
Solution Approach 1:
The invention employs a self-service approach where polymer yarns are aggregated into tows that inherently maintain structural integrity and uniformity. The cutting process then simply divides these pre-organized tows into particles, allowing the material structure itself to serve the morphology control function without requiring expensive advanced processing techniques.
4Adaptability or versatility
If varying particle morphology is present in consumable powder, then production flexibility is improved, but fusing process uniformity deteriorates
Solution Approach 1:
The invention applies local quality control by ensuring that each particle within the powder batch has uniform morphology characteristics through the controlled cutting of aggregated yarns. This local uniformity at the particle level ensures consistent fusing behavior throughout the entire powder bed during additive manufacturing, while the overall process remains flexible for different polymer materials.
Data Source
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AI summary
A consumable polymeric based powder mixture may include a plurality of polymeric based particles that have a unitary construction. At least about 80% of the plurality of polymeric based particles may further have a generally cylindrical shape. The plurality of polymeric based particles may further have a particle length distribution span (PLDS) of not greater than about 1.2, where PLDS is equal to (L80-L20)/L50.