Dual-Blade Tape Casting for Uniform Slurry Deposition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional tape casting apparatuses experience issues such as streaking due to large agglomerates and turbulent flow, leading to non-uniformity and foil tears, which affect the quality of the cast layer in additive manufacturing processes.
Innovation Solution
A tape casting apparatus with two or more doctor blades, including a filtering blade to catch large agglomerates and a casting blade to ensure uniformity, along with an overflow control feature to manage fluid flow and reduce air incorporation, enhancing the uniformity and reducing foil tears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single blade is used for casting slurry, then the device complexity is low, but the casting uniformity deteriorates due to streaking from large agglomerates
Solution Approach 1:
The single casting blade is segmented into two functional blades: a first blade for filtering large agglomerates and a second blade for casting the slurry. This segmentation allows each blade to perform a specialized function, improving casting uniformity by removing defects before casting while maintaining manageable device complexity through modular blade design.
Solution Approach 2:
The first blade performs preliminary filtering action on the slurry to remove large agglomerates before the slurry reaches the second casting blade. This preliminary action prevents streaking and improves casting uniformity by eliminating potential defects in advance of the casting process.
2Productivity
If the foil sheet moves quickly through the reservoir, then the productivity is high, but the slurry flow becomes turbulent causing air incorporation and non-uniformity
Solution Approach 1:
The first filtering blade acts as an intermediary element between the slurry reservoir and the second casting blade. It stabilizes the slurry flow by filtering agglomerates and creating a more uniform flow pattern, which reduces turbulence and air incorporation even at higher casting speeds, thereby maintaining both productivity and precision.
3Manufacturing precision
If the blade is positioned close to the foil sheet to reduce layer thickness variation, then the manufacturing precision is high, but large agglomerates cause foil tears
Solution Approach 1:
The blade system is segmented into two separate blades positioned at different heights. The first blade is positioned higher to filter agglomerates without contacting the foil, preserving foil integrity. The second blade is positioned closer to the foil for precise thickness control. This segmentation allows both high manufacturing precision and reliable foil integrity to be achieved simultaneously.
Solution Approach 2:
The first blade performs preliminary filtering of large agglomerates before the slurry reaches the second blade and foil sheet. This preliminary removal of problematic agglomerates prevents foil tears while allowing the second blade to be positioned optimally close to the foil for precise layer thickness control.
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 solution effectively reduces streaking and improves cast layer uniformity by preemptively removing impurities and managing fluid flow, thereby enhancing printer performance and minimizing costs.
Implementation Method 1
a second blade positioned within the reservoir, the second blade having a first edge proximate the first side wall, a second edge proximate the second side wall, and a second blade tip positioned proximate the foil sheet at a filtering height
Implementation Method 2
translating the moveable foil sheet to generate fluid flow in the slurry from a first end of the reservoir toward a second end of the reservoir
Implementation Method 3
an overflow control feature within the reservoir to allow for fluid flow between the first cavity and the second cavity
Data Source
AI summary
A tape casting apparatus including a reservoir with a first side wall and a second side wall opposite the first side wall, and a foil sheet moveable along a horizontal axis. The apparatus includes a first blade having a first edge coupled to the first side wall, a second edge coupled to the second side wall, and a first blade tip positioned at a casting height. The apparatus includes a second blade having a first edge coupled to the first side wall, a second edge coupled to the second side wall, and a second blade tip positioned at a filtering height. The second blade defines an overflow control feature formed therein. The reservoir includes a first cavity and a second cavity, wherein the first cavity is in fluid communication with the second cavity between the foil sheet and the second blade and through the overflow control feature.