Variable Absorber Dosing for 3D Printed Part Precision
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Solution Overview
Problem
Current 3D printing methods using absorbers for high-speed sintering face issues such as reduced accuracy, limited area adjustability, low surface quality, and increased costs due to the need for multiple wetting steps and the use of a second printing fluid, which affects the precision and efficiency of energy distribution during the sintering process.
Innovation Solution
A method where the amount of absorber within a layer per printed image dot is set to a predetermined value, allowing for variable absorber dosing per image dot, enabling precise control of energy input and material properties, and eliminating the need for a second printing fluid, thereby improving edge sharpness and surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wetting steps and a second printing fluid are used to control energy distribution, then material properties can be adjusted, but manufacturing precision and surface quality deteriorate due to reduced accuracy and limited area adjustability
Solution Approach 1:
The patent extracts the absorber application from the traditional multi-step wetting process and second printing fluid requirement. By using a single printing fluid containing absorber particles that can be selectively deposited in varying amounts, the complex multi-fluid system is simplified to a single-fluid system that achieves the same material property control without compromising precision
Solution Approach 2:
The patent implements local quality by enabling variable absorber dosing at different spatial locations within the construction field. The printing head can deposit different amounts of absorber in different image dots, allowing localized control of energy absorption and sintering behavior, which achieves both material property adjustment and high manufacturing precision
2Adaptability or versatility
If multiple wetting steps are used to control energy input, then material properties can be varied, but productivity decreases due to increased process time
Solution Approach 1:
The patent merges the absorber application function into the primary printing process. Instead of separate wetting steps for absorber deposition, the absorber-containing printing fluid is applied in the same step as the binder material, combining multiple functions into a single operation that maintains productivity while enabling energy input control
Solution Approach 2:
The absorber particles are pre-mixed into the printing fluid before the printing process begins. This preliminary preparation allows the printing head to directly deposit variable amounts of absorber during normal printing operations without requiring additional absorber application steps, thereby maintaining high printing speed
3Adaptability or versatility
If a second printing fluid is used for absorber application, then energy distribution can be controlled, but device complexity increases
Solution Approach 1:
The patent makes the printing fluid universal by formulating it to contain both binder material and absorber particles. This single multi-functional fluid replaces the need for separate binder fluid and absorber fluid systems, simplifying the printing system architecture while maintaining the ability to control energy distribution through variable absorber dosing
4Manufacturing precision
If variable absorber dosing is implemented per image dot, then surface quality improves, but process complexity increases
Solution Approach 1:
The patent controls surface quality by varying the absorber concentration parameter within the printing fluid at different image dot locations. The system adjusts the amount of absorber deposited in each image dot based on the desired energy absorption characteristics, achieving high surface quality through parameter variation rather than complex mechanical dosing mechanisms
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 approach enhances the accuracy and surface quality of 3D printed parts by allowing for precise control of energy distribution and material properties, reducing costs, and enabling the use of a wider range of materials without compromising speed or quality.
Implementation Method 1
one or more absorbers or one or more liquids comprising one or more absorbers are selectively applied as printed image dots... energy is input by means of an energy source, the areas with selectively applied absorber selectively solidifying
Implementation Method 2
energy is input by means of an energy source, the areas with selectively applied absorber selectively solidifying
Data Source
AI summary
A method for producing 3D moulded parts, wherein one or more building materials in the form of particles are applied in a defined layer to a building area by means of a coater (101), one or more absorbers or one or more liquids comprising one or more absorbers are selectively applied as printed image dots by means of a printhead (100), an energy input is performed by means of an energy source (108, 109), wherein the regions with selectively applied absorber are selectively solidified, the building area is lowered by the thickness of a layer or the coater is raised by the thickness of a layer, these steps are repeated until the desired 3D moulded part (103) is created, wherein the amount of absorber within a layer (301) per printed image dot is set to a predetermined value and wherein predetermined values that are different in two or more image dots can be set within a layer.