Multi-Material 3D Printing With Selective Powder Recovery
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Solution Overview
Problem
Existing 3D printing technologies for multilayer components with different materials are inefficient and expensive due to excess raw material usage and the inability to reuse unused material without mixing, requiring complex and costly cleaning processes.
Innovation Solution
A 3D printer with separate dispensers, recovery devices, and a conveyor belt system that allows for the selective application and recovery of different raw materials, ensuring they do not mix, and recirculates them efficiently, enabling a single printing operation for multilayer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single dispenser and single recovery device are used, then device complexity is reduced, but different raw materials will mix and cannot be selectively recovered
Solution Approach 1:
The system divides the raw material supply and recovery functions into separate segments for each material type. Each dispenser is dedicated to one raw material, and each recovery device is dedicated to recovering a specific material, preventing mixing and enabling selective recovery of unused materials.
Solution Approach 2:
Each dispenser and recovery device is configured with specific local properties tailored to its assigned material. The dispensers have different coating characteristics for different materials, and recovery devices are positioned and configured to selectively recover specific materials based on their local material properties.
2Loss of substance
If multiple raw materials are applied to the same conveyor belt, then material usage efficiency improves, but materials will mix and contaminate each other
Solution Approach 1:
The conveyor belt system is segmented into different zones, with each zone dedicated to a specific raw material. This spatial segmentation allows multiple materials to be processed simultaneously on the same conveyor belt while maintaining material purity and preventing contamination.
Solution Approach 2:
The conveyor belt acts as an intermediary carrier that transports different raw materials through distinct pathways or zones. This intermediary system enables efficient material usage by allowing continuous processing while maintaining strict separation between different materials through the conveyor's structured design.
3Manufacturing precision
If the entire printer is cleaned for material changes, then manufacturing precision is maintained, but productivity decreases due to cleaning time
Solution Approach 1:
The cleaning function is extracted from the main printing process. Instead of cleaning the entire printer for material changes, the system recovers and removes unused materials through dedicated recovery devices during or immediately after the printing process, eliminating the need for separate cleaning operations and maintaining continuous productivity.
Solution Approach 2:
The recovery devices operate continuously during the printing process to remove and recover unused raw materials. This continuous action maintains manufacturing precision by preventing material contamination while preserving productivity by eliminating interruptions for cleaning operations.
4Manufacturing precision
If excess raw material is used for structuring, then manufacturing precision is ensured, but loss of substance increases
Solution Approach 1:
Instead of discarding excess raw material after printing, the system implements recovery devices that collect and recover unused materials from the conveyor belt and printing area. This recovery process maintains manufacturing precision by ensuring complete material removal while significantly reducing substance loss through material reuse.
Solution Approach 2:
The recovery system provides feedback about material usage and recovery rates to the dispensing system. This feedback mechanism allows optimization of material application to match actual usage patterns, reducing excess material application while maintaining manufacturing precision through controlled dispensing adjustments.
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 efficient and cost-effective production of multilayer components with different materials by minimizing raw material waste and allowing flexible, resource-saving manufacturing processes.
Implementation Method 1
a coating device that deposits a layer of raw material onto the conveyor belt
Implementation Method 2
The raw material, which is photosensitive in this case, then cures by photopolymerization of a binder it contains
Data Source
AI summary
A 3D printer for additively manufacturing a multilayer component. The 3D printer includes at least two separate dispensers coating a conveyor belt with respectively different raw material, a manufacturing unit in which at least part of the raw material is added to the component as a new layer, at least two separate recovery devices for selectively recovering the respectively different raw material, which is not consumed when a layer is added to the component, and for returning the raw material to the respective associated dispenser, and conveyor belt that transports the raw material from the dispenser to the manufacturing unit and further to the recovery device in the lateral direction.