Selective Fusion Polymer Powder for Uniform Mechanical Properties
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Solution Overview
Problem
The use of nylon 12 powders with narrow particle size distribution in rapid prototyping by solid phase sintering results in articles with heterogeneous mechanical properties and inadequate surface appearance.
Innovation Solution
Thermoplastic polymer powders with specific particle size distribution (d50 between 20 and 100 μm), sphericity (0.8 to 1), and low intraparticle porosity (<0.05 ml/g) are used for selective fusion, enabling the production of articles with high density and uniform mechanical properties, and improved surface appearance, including polyamides like nylon 6 or 6-6.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If nylon 12 powders with narrow particle size distribution (d50 between 50 and 150 μm) are used for rapid prototyping by solid phase sintering, then the manufacturing process is simple and well-established, but the articles produced have heterogeneous mechanical properties and inadequate surface appearance
Solution Approach 1:
The invention changes the particle size distribution parameters from narrow (d50 50-150 μm) to broad (d50 20-100 μm with (d90-d10)/d50 between 0.85-1.2), and modifies particle morphology parameters (sphericity 0.8-1, intraparticle porosity <0.05 ml/g). These parameter changes enable uniform mechanical properties and good surface appearance while maintaining ease of manufacture through standardized powder production processes
Solution Approach 2:
The invention applies local quality by ensuring uniform particle characteristics (sphericity and intraparticle porosity) throughout the powder batch, which leads to homogeneous melting and sintering behavior. This local uniformity in particle properties translates to uniform mechanical properties throughout the final article, resolving the heterogeneity issue without complicating the manufacturing process
2Manufacturing precision
If nylon 12 powders with narrow particle size distribution are used for rapid prototyping by solid phase sintering, then the process is well-established, but the surface appearance of articles is inadequate
Solution Approach 1:
The invention modifies powder parameters including reducing d50 to 20-100 μm, broadening distribution ((d90-d10)/d50 between 0.85-1.2), increasing sphericity (0.8-1), and reducing intraparticle porosity (<0.05 ml/g). These changes improve surface appearance by enabling more complete and uniform melting during sintering, while the controlled specification ranges maintain ease of manufacture through reproducible production processes
Solution Approach 2:
The invention creates a standardized powder specification that can be replicated across different production batches and potentially different polyamide types (including nylon 6 and 6-6). This copied powder quality standard ensures consistent surface appearance results while simplifying manufacturing through established powder production and quality control procedures
3Adaptability or versatility
If conventional nylon 12 powders are used for selective fusion, then only this specific polyamide can be processed, but the versatility of the method is limited
Solution Approach 1:
The invention creates a universal powder specification that works across multiple polyamide types (nylon 12, nylon 6, nylon 6-6). By defining universal parameters (d50 20-100 μm, sphericity 0.8-1, intraparticle porosity <0.05 ml/g), the method achieves versatility in material selection while maintaining manufacturing precision and article quality across all compatible polyamides
Solution Approach 2:
The invention adjusts powder parameters to optimal ranges that accommodate the melting and sintering characteristics of different polyamide types. The broadened particle size distribution and controlled sphericity and porosity create a universal powder quality standard that enables successful selective fusion of various polyamides while maintaining uniform mechanical properties and good surface appearance
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 method produces articles with high density and uniform mechanical properties, and enhanced surface appearance, equivalent to those produced by injection molding, while allowing the use of previously unutilized polyamides like nylon 6 or 6-6.
Implementation Method 1
selective fusion of polymer powder layers, in particular by rapid prototyping using a laser
Implementation Method 2
rapid prototyping by solid phase sintering, using a laser
Implementation Method 3
rapid prototyping by solid phase sintering
Data Source
AI summary
A method for manufacturing items by the selective fusion of polymer powder layers, particularly rapid prototyping by solid phase sintering a thermoplastic polymer powder by means of a laser, having characteristics of grading and particle distribution is described. Items obtained from such a method are also described.