Coextruded Microchannel Web Die for Precision Flow Control
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Solution Overview
Problem
The challenge lies in creating uniform and high-precision coextruded channel webs with microchannels for applications requiring specific mechanical and thermal properties, as existing technologies face limitations in achieving consistent flow resistance and polymer compatibility, especially for smaller channels and coextrusion processes.
Innovation Solution
The development of coextruded articles with specific microchannel configurations, including multiple layers and walls per cm, precise width variations, and controlled porosity, achieved through a method involving an extrusion die with multiple cavities and die slots, allowing for the formation of continuous coextruded articles with high void content and tailored mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If higher precision extrusion dies are used for smaller channels, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The extrusion die is divided into multiple segments including a first die for extruding a first polymer and a second die for extruding a second polymer. Each die has its own manifold system and extrusion opening, allowing independent control and precision optimization for each polymer stream while maintaining overall system manageability.
Solution Approach 2:
The second die is positioned within or adjacent to the first die structure, with the second polymer extrusion integrated into the overall die assembly. This nested arrangement allows precise control of microchannel formation while consolidating the complex die structure into a compact integrated unit.
2Strength
If coextrusion of multiple polymers is performed, then mechanical properties are improved, but reliability of polymer welding decreases
Solution Approach 1:
The patent employs different polymer materials in different regions of the extrusion process. The first polymer and second polymer are selected with specific compatibility characteristics for their intended locations, allowing optimization of mechanical properties in each region while ensuring reliable welding at the interface through careful material selection.
Solution Approach 2:
The invention uses coextrusion to create a composite structure with multiple polymer layers. By selecting polymers with compatible welding characteristics and appropriate processing conditions, the composite structure achieves enhanced mechanical properties while maintaining reliable weld lines at the polymer interfaces.
3Manufacturing precision
If uniform flow passageway resistance is achieved, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The flow passageway system is segmented into multiple independent manifolds - a first manifold for the first polymer and a second manifold for the second polymer. Each manifold can be independently designed and adjusted to achieve uniform flow resistance for its respective polymer stream, simplifying the overall design while maintaining precision.
Solution Approach 2:
The patent adjusts flow passageway parameters such as diameter, length, and configuration in each manifold to control flow resistance. By independently tuning these parameters for each polymer stream, uniform flow distribution is achieved without requiring an overly complex integrated manifold system.
4Reliability
If air ports are added to prevent channel collapse, then reliability is improved, but manufacturing precision decreases
Solution Approach 1:
The support function is extracted from the polymer material itself and provided by a separate air pressure system. Air ports are strategically positioned to introduce air pressure that supports the channel structure during extrusion, preventing collapse without requiring the polymer to provide structural support, thereby maintaining geometric precision.
Solution Approach 2:
Air pressure acts as an intermediary support mechanism between the extrusion process and the channel structure. The air ports introduce pressurized air that temporarily supports the forming channel walls during extrusion, preventing collapse while allowing the polymer to flow and form precise geometric features without structural compromise.
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 enables the creation of coextruded articles with enhanced mechanical properties, high void content, and efficient heat transfer capabilities, suitable for cushioning, spacer webs, and temperature control applications, while minimizing material usage and weight.
Implementation Method 1
extruding the layers from the distal opening of the die slots; and forming together the extrusion melt from first and second die slot with the plurality of extrudate from the third die slots into one continuous coextruded article
Data Source
AI summary
Coextruded articles comprising first and second layers each having first and second opposed major surfaces and between the first and second layers a series of first walls providing a series of microchannels, and methods for making the same. Embodiment of coextruded articles described herein are useful, for example, in cushioning applications where high levels of compression are desired.