Multi-Polymer Composite Fabrication with Sequential Powder Curing
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Solution Overview
Problem
Current additive manufacturing techniques are limited to producing single composite material structures, lacking the capability to integrate different materials during a single processing process, which restricts the creation of complex structures with varied properties.
Innovation Solution
A system comprising multiple polymer additive manufacturing devices that sequentially deposit and cure different polymer powders on a substrate using adhering agents, allowing for the formation of multi-polymer composite structures with distinct materials at different locations, enabling the integration of materials with different properties in a single process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple polymer additive manufacturing devices are integrated to deposit different polymer powders, then material versatility and composite structure capability are improved, but device complexity increases
Solution Approach 1:
The system divides the additive manufacturing process into separate functional modules, with each polymer additive manufacturing device dedicated to specific polymer types. This segmentation allows independent optimization of each device while maintaining overall system versatility, resolving the contradiction between material versatility and device complexity.
Solution Approach 2:
Multiple polymer additive manufacturing devices are integrated into a single system that can process different polymer powders (first polymer powder, second polymer powder with different properties) using common infrastructure such as the substrate handling system, adhering agent application system, and curing system. This multi-functionality approach enables material versatility without proportionally increasing overall device complexity.
2Strength
If multiple different polymer powders are deposited and cured in sequence, then composite structure properties are improved, but processing time increases
Solution Approach 1:
The system implements continuous processing where multiple polymer additive manufacturing devices operate in parallel or sequential fashion without idle time between steps. The substrate is continuously conveyed through the system, and curing processes are overlapped or immediately sequenced, eliminating non-value-added time and reducing total processing time while maintaining composite structure quality.
Solution Approach 2:
Adhering agents are applied to the substrate in advance before polymer powder deposition, and support structures are pre-configured in the system. This preliminary preparation allows the subsequent polymer deposition and curing steps to proceed without interruption, reducing overall processing time while ensuring proper bonding and structural integrity of the composite material.
3Manufacturing precision
If adhering agents are used to bond polymer powders to substrate, then manufacturing precision is improved, but material purity decreases
Solution Approach 1:
Adhering agents are applied selectively only to specific regions of the substrate where polymer powder bonding is required, rather than uniformly across the entire substrate. This localized application minimizes the total amount of adhering agent used and reduces contamination of areas where pure polymer material is desired, thereby maintaining material purity while achieving precise manufacturing where needed.
Solution Approach 2:
The system optimizes the chemical composition and physical properties of adhering agents to enhance bonding efficiency at lower concentrations. By modifying parameters such as adhesive strength per unit concentration, evaporation rate, and compatibility with different polymer types, the system achieves precise polymer powder adhesion with minimal adhering agent usage, thus preserving material purity.
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 the fabrication of multi-polymer composite structures with enhanced properties, allowing for the creation of complex designs that utilize the unique characteristics of various materials, such as elastomer skins with harder internal reinforcements, thereby expanding the capabilities of additive manufacturing.
Implementation Method 1
an image forming device selectively deposits an adhering agent in a desired first pattern onto portions of a substrate material
Implementation Method 2
a powder applicator applies a first polymer powder onto the substrate material and the adhering agent, with the first polymer powder attaching to the substrate material via interaction with the adhering agent
Implementation Method 3
a fuser cures the polymer image to stabilize the polymer image on the substrate material
Data Source
AI summary
An additive manufacturing (AM) system manufactures composite structures having different materials in an integrated manner during a single processing process. For example, a first composite image is created on a substrate and then that image is stabilized by heat, pressure of chemical fusion not to the point of complete solid formation but enough to give the first composite image enough stability so that it is not disturbed by subsequent processing. A second image is then created on parts of the substrate not covered by the first composite image, a second powder is applied, and excess second powder that is not part of the second image is removed. The substrate may be cut into sheets that are stacked in register for consolidation and subsequent matrix removal resulting in a multi-polymer 3D object.