Multiphase Direct Ink Writing Print Head for Multilayered Composites
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Solution Overview
Problem
Current additive manufacturing techniques face challenges in achieving high precision and speed for the fabrication of multilayered composite structures with alternating layers of immiscible feedstocks, particularly in maintaining layer integrity and mechanical properties.
Innovation Solution
The use of a print head configured to co-extrude two immiscible feedstocks with matched viscosities, forming bilayer extrudates that are transformed into multilayer extrudates through a series of multipliers and reducers, allowing for high-speed deposition of alternating layers with precise control, compatible with natural and synthetic polymers, and nanostructures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional additive manufacturing techniques are used to fabricate multilayered composite structures, then layer-by-layer deposition is achieved, but printing speed and precision are limited
Solution Approach 1:
The feedstock flow is segmented into multiple separate channels within the print head, allowing independent control and precise positioning of each layer material. The multi-channel spinneret divides the extrusion stream into distinct lanes that can be precisely controlled to achieve high-resolution multilayered structures at high printing speeds
Solution Approach 2:
The patent transitions from conventional single-line extrusion to multi-line co-extrusion by adding a spatial dimension to the material delivery system. Multiple feedstocks are extruded simultaneously in different spatial positions within the same printing line, enabling parallel fabrication of multiple layers and significantly increasing printing speed while maintaining precision through coordinated control of each channel
2Adaptability or versatility
If immiscible feedstocks are co-extruded to form alternating layers, then multilayered composite structures are created, but layer integrity and mechanical properties are compromised
Solution Approach 1:
Each channel in the multi-channel spinneret is optimized for specific material properties, with local quality control ensuring that each feedstock maintains its structural integrity throughout the extrusion process. The print head design provides localized support and control for each material stream, preventing degradation of layer integrity even when materials are immiscible
Solution Approach 2:
The patent creates composite materials by combining multiple feedstocks with different properties in a controlled co-extrusion process. The multi-channel spinneret enables the formation of composite structures where each layer maintains its material characteristics while contributing to the overall mechanical properties of the multilayered composite
3Productivity
If multiple feedstocks with matched viscosities are extruded, then continuous ink deposited structures are formed, but device complexity increases
Solution Approach 1:
The multi-channel spinneret is designed as a universal component that can handle multiple feedstocks simultaneously, providing a single integrated solution for co-extrusion. The print head configuration serves multiple functions: material delivery, layer separation, and positioning control, reducing the need for separate components and simplifying the overall device architecture despite the increased capability to process multiple materials
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 method enables high-speed printing of multilayered composites with precision down to 4 µm, enhanced mechanical properties, and scalable thin-ply structures, improving layer thickness precision and particle orientation, resulting in improved modulus and strength compared to traditional methods.
Implementation Method 1
co-extruding two immiscible feedstocks with matched viscosities through a print head configured to form continuous ink deposited structures
Implementation Method 2
a minimizer configured to receive the bilayer extrudate from the spinneret and to reduce a flow area of bilayer extrudate transverse to a flow direction of the bilayer extrudate
Implementation Method 3
a multiplier configured to transform the bilayer extrudate from the minimizer to a multilayer extrudate. The multilayer extrudate includes alternating layers of the first feedstock and the second feedstock
Data Source
AI summary
An additive manufacturing print head includes a spinneret defining a first channel configured to receive a first feedstock and a second channel configured to receive a second feedstock. The spinneret is configured to provide a bilayer extrudate including a layer of the first feedstock in direct contact with a layer of the second feedstock. The print head further includes a minimizer configured to receive the bilayer extrudate from the spinneret and to reduce a flow area of bilayer extrudate transverse to a flow direction of the bilayer extrudate, and a multiplier configured to transform the bilayer extrudate from the minimizer to a multilayer extrudate. The multilayer extrudate includes alternating layers of the first feedstock and the second feedstock.