Dual-Surface Filter Material for Liquid Separation
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Solution Overview
Problem
Existing filter materials for separating liquids from fluid streams are thick and costly due to their multi-layer construction, which reduces filter area and increases production complexity.
Innovation Solution
A filter material with two sides impregnated using different binders to achieve varying surface energies, allowing for efficient liquid separation with a single, thinner layer, where one side has a high surface energy for liquid collection and the other a low surface energy as a barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If at least two different filter media are used for separating liquids from fluid streams, then the separation function is achieved, but the filter material becomes thick and the production becomes complex and cost-intensive
Solution Approach 1:
The patent combines the functions of multiple filter media into a single filter material by impregnating both sides with different binders having different surface energies. One side uses a binder with high surface energy for liquid collection, while the other side uses a binder with low surface energy as a barrier, eliminating the need for separate layers while maintaining separation effectiveness.
Solution Approach 2:
The patent applies different binder properties to different sides of the same filter material. The first side is impregnated with a binder having high surface energy to attract and collect liquid droplets, while the second side is impregnated with a binder having low surface energy to repel liquids and act as a barrier, creating localized functional zones within a single layer.
2Reliability
If at least two different filter media are used for separating liquids from fluid streams, then the separation function is achieved, but the production becomes complex and cost-intensive
Solution Approach 1:
The patent merges the production process into a single impregnation step where both sides of the filter material are treated simultaneously or sequentially with different binders. This eliminates the need for separate assembly of multiple layers, reducing production complexity and cost while maintaining the dual-function separation capability.
Solution Approach 2:
The patent applies different binder impregnation processes to different sides of the filter material during manufacturing. The first side receives a binder with high surface energy properties, while the second side receives a binder with low surface energy properties, creating functionally differentiated zones within a single integrated production process.
3Reliability
If the filter material is made thicker to include multiple layers, then the separation function is improved, but the filter area in a filter element of given size is reduced
Solution Approach 1:
The patent combines multiple separation functions into a single thin filter layer, allowing the filter element to maintain a large active filter area while achieving effective liquid separation. The dual-binder impregnation provides both liquid collection and barrier functions within the same plane, maximizing the usable filter area.
4Ease of manufacture
If a single filter material is used instead of multiple layers, then the production becomes simpler and less costly, but the separation efficiency may be compromised
Solution Approach 1:
The patent compensates for the simplicity of using a single layer by creating locally differentiated zones through selective binder impregnation. The first side with high surface energy binder efficiently collects liquid droplets, while the second side with low surface energy binder provides a barrier function, together achieving separation efficiency comparable to or exceeding multi-layer systems.
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 results in a cost-effective, thin filter material with improved separation efficiency and reduced production complexity, enhancing the separation of liquids from fluid streams.
Implementation Method 1
an attempt is usually made to collect the droplets by adsorption on a suitable filter material
Implementation Method 2
This second filter medium is impenetrable by the liquid droplets due to the corresponding surface energy
Implementation Method 3
The liquid droplets are therefore deposited on the upstream surface of the second filter material and are usually discharged by gravity
Data Source
AI summary
A filter material for separating liquids from fluid flows comprises a wet- or dry-laid nonwoven, woven fabric, or an open-cell foam. The two sides of the filter material are impregnated with two different binders in such a way that one side of the filter material has a higher amount of surface energy and thus a shorter drop sink-in time than the opposite side.