Continuous-Fiber Composite Printing for Stronger Building Material Layers
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Solution Overview
Problem
Existing 3D construction printing methods result in structures with poor mechanical properties due to weak interlayer bonds, and existing reinforcement solutions are complex, non-automatable, and not compatible with all shapes and compositions, leading to local decohesion and high costs.
Innovation Solution
A system and method for embedding continuous fibers into a printed matrix using a dispensing head that oscillates vertically to create a continuous pattern, combined with an elastic return mechanism for the dispensing head, allowing for improved adhesion between layers and simplified operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing elements such as steel bars, nails, or screws are placed in the interlayer, then mechanical strength is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the complex manual reinforcement process and replaces it with an automated fiber injection system integrated into the printing head, extracting the harmful complexity while preserving the strengthening function
Solution Approach 2:
The reinforcement fiber injection device is merged with the printing head into a single integrated unit, combining the deposition and reinforcement functions into one component, thereby reducing overall device complexity
2Strength
If reinforcing elements are placed in the interlayer, then mechanical strength is improved, but ease of manufacture deteriorates due to non-automatable processes
Solution Approach 1:
The system performs self-service by automatically injecting reinforcement fibers during the printing process itself, eliminating the need for separate manual reinforcement steps and making the process fully automatable
Solution Approach 2:
The reinforcement fiber injection occurs continuously during the printing process without interruption, maintaining continuous useful action throughout manufacturing rather than requiring separate discrete reinforcement steps
3Strength
If pieces of fiber are introduced directly into the building material before printing, then reinforcement is achieved, but adhesion between layers deteriorates and extrusion difficulty increases
Solution Approach 1:
The printing head deposits a layer of matrix material before injecting the reinforcement fiber, performing the preliminary action of creating a bonding interface that ensures proper adhesion between the fiber and subsequent layers
Solution Approach 2:
The system applies reinforcement fibers locally at specific positions within the matrix material rather than uniformly distributing them, allowing optimized adhesion in critical interlayer regions while maintaining extrudability
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 system produces a composite construction material with enhanced mechanical strength and adhesion between layers, eliminating the need for subsequent reinforcement steps and reducing operational complexity.
Implementation Method 1
an elastic return element configured to passively return the dispensing head from the low position to the high position
Data Source
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AI summary
The present invention relates to a system (1) and a method for manufacturing a composite building material comprising a printed matrix and a continuous fiber (122) embedded in this matrix, the system comprising a printhead (11) configured to deposit the printed matrix by depositing material in successive layers (111) on a deposition plane, and an injection device (12) configured to inject the continuous fiber into the matrix deposited by the printhead, the injection device comprising a distribution head (121) configured to deliver the fiber, and a drive device (124) configured to swing the distribution head between a high position and a low position.