Polymeric Powder Composition for 3D Printing
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Solution Overview
Problem
Current 3D printing technologies face challenges in achieving optimal packing density and uniform layer coating, leading to issues with physical attributes and material efficiency, particularly in the curing/fusing process.
Innovation Solution
A polymeric powder composition comprising differently sized polymer particles, with a computationally predetermined packing density range of 0.4 g/ml to 0.9 g/ml, is used, where the particle sizes and distribution are rationally designed using a computational modeling method to enhance packing density, layer uniformity, and reduce surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single polymer particle size is used in 3D printing, then the manufacturing process is simple, but the packing density and layer uniformity are poor
Solution Approach 1:
The polymer powder is segmented into three distinct particle size ranges: fine particles (5-25 μm), medium particles (25-50 μm), and coarse particles (50-100 μm). This segmentation allows each size fraction to occupy different spatial positions during packing, with finer particles filling voids between larger particles, thereby achieving optimal packing density and layer uniformity in the 3D printed object.
2Quantity of substance
If polymer particles are densely packed to improve material efficiency, then material efficiency improves, but surface roughness increases
Solution Approach 1:
Different particle size fractions are strategically distributed to achieve local quality optimization: coarse particles (50-100 μm) form the structural framework providing mechanical strength, medium particles (25-50 μm) fill intermediate voids, and fine particles (5-25 μm) fill surface-level pores. This local quality differentiation enables dense packing for material efficiency while the fine particle coating smooths the surface, reducing roughness.
3Manufacturing precision
If computational modeling is used to determine particle size distribution, then packing density is optimized, but the process complexity increases
Solution Approach 1:
Computational modeling is performed in advance to determine the optimal particle size distribution composition (specific weight percentages of fine, medium, and coarse particles) before actual 3D printing. The model simulates packing behavior and predicts the ideal multi-modal size distribution. This preliminary computational action establishes optimized particle composition guidelines that simplify the subsequent manufacturing process, as the optimal mix ratio is predetermined rather than requiring real-time adjustment during printing.
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 solution improves the physical attributes of 3D printed objects by optimizing packing density, reducing final physical shrinkage, and enhancing material efficiency through controlled porosity and improved sintering/fusing processes.
Implementation Method 1
selectively applying a coalescent agent on at least a portion of the polymeric powder composition; and exposing the polymeric powder composition and the coalescent agent to radiation, whereby the coalescent agent absorbs the radiation and converts the absorbed radiation to thermal energy
Implementation Method 2
heating the polymeric powder composition to a temperature ranging from about 50°C to about 350°C
Data Source
Figure 1~2
Figure 3A~3D
Figure 3E~5
AI summary
A polymeric powder composition for three-dimensional printing includes first, second, and third polymeric particles. The first particles, having a first average size, are present in an amount ranging from about 70 wt% to about 95 wt%. The second particles, having a second average size smaller than the first average size, are present in an amount ranging from about 0.5 wt% to about 21 wt%. The third particles, having a third average size smaller than the second average size, are present in an amount ranging from greater than 0 wt% up to about 21 wt%. Each of the first, second, and third average sizes independently ranges from 5 μm to about 100 μm. A sum of the fractional weight ratios of all of the polymeric particles in the polymeric powder composition equals 1.