Circulating Degassing Filtration for High-Viscosity Spinning Dope
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Solution Overview
Problem
Conventional methods struggle to effectively degas high-viscosity spinning stock solutions due to viscous resistance, leading to difficulties in bubble removal and affecting fiber quality and subsequent spinning processes.
Innovation Solution
A dissolving and degassing equipment with a vacuum pump, circulation pump, and filters with varying mesh sizes is employed to create a circulation loop, allowing for simultaneous dissolution, filtration, and degassing, ensuring bubble-free and impurity-free spinning stock solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a static vacuum degassing method is employed for high-viscosity spinning stock solution, then the equipment structure is simple, but the bubbles cannot effectively diffuse to the surface due to viscous resistance, making degassing difficult
Solution Approach 1:
The patent transforms the static vacuum degassing system into a dynamic circulation system. The circulation pump continuously circulates the high-viscosity spinning stock solution through the dissolution tank and back, creating dynamic flow that overcomes viscous resistance and enables effective bubble removal throughout the entire solution volume, not just at the surface.
Solution Approach 2:
The patent introduces a filter as an intermediary component with multiple mesh layers. This filter serves as a mediator that captures bubbles and impurities from the circulating high-viscosity solution, facilitating degassing and purification functions that would be difficult to achieve with vacuum alone in such viscous materials.
2Volume of moving object
If the liquid level of the dope in the dissolution tank changes, then the volume of dope is flexible, but the resistance to internal bubbles increases, making degassing even more difficult
Solution Approach 1:
The circulation pump maintains continuous circulation of the dope through the tank, ensuring that regardless of liquid level changes, the solution is constantly moved and degassed. This continuous action prevents bubble accumulation and maintains effective degassing throughout the process, overcoming the increased resistance that would otherwise occur with varying liquid levels.
Solution Approach 2:
The filter acts as an intermediary that captures bubbles at various stages of circulation. By placing the filter in the circulation path, bubbles are intercepted and removed from the solution before they can rise to the surface, effectively reducing the harmful effect of viscous resistance on bubble removal regardless of liquid level.
3Manufacturing precision
If multiple filters with different mesh sizes are used, then the purification effectiveness is improved, but the device complexity increases
Solution Approach 1:
The filter is segmented into multiple mesh layers with different pore sizes arranged in sequence. This segmentation allows progressive filtration where larger impurities are caught by coarser meshes and finer impurities are captured by tighter meshes, achieving high purification effectiveness while keeping each individual mesh layer relatively simple in structure.
Solution Approach 2:
The multi-mesh filter structure serves multiple functions simultaneously: it acts as a bubble trap, an impurity filter, and a flow distributor. By combining these functions into a single multi-layered filter component, the patent achieves high purification effectiveness without proportionally increasing device complexity, as the filter performs several degassing and filtration tasks in one element.
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 equipment provides a uniform, high-purity spinning stock solution, improving the yield and quality of fibers by effectively removing bubbles and impurities, enhancing the spinning process.
Implementation Method 1
The vacuum pump is connected to a top portion of the dissolution tank and is configured to remove bubbles in the dope
Implementation Method 2
The circulation pump is connected to a bottom portion of the dissolution tank and is configured to draw the dope from the dissolution tank
Implementation Method 3
The filter has plural sieves with different numbers of meshes, configured to capture impurities of different sizes and additional bubbles in the dope drawn from the dissolution tank
Data Source
AI summary
A dissolving and degassing equipment includes a dissolution tank, a vacuum pump, a circulation pump, and at least one filter. The dissolution tank is configured to accommodate dope. The vacuum pump is connected to a top portion of the dissolution tank and is configured to remove bubbles from the dope. The circulation pump is connected to a bottom portion of the dissolution tank and is configured to draw the dope from the dissolution tank. The filter is connected to the circulation pump and the dissolution tank, and is located downstream of the circulation pump and upstream of the dissolution tank. The filter includes a plurality of sieves with different numbers of meshes, configured to capture impurities of different sizes and additional bubbles in the dope drawn from the dissolution tank.