Hydrophobic Nonwoven Filter Medium for Corrugation Stability
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Solution Overview
Problem
Existing filter media become less hydrophobic and more prone to water absorption when corrugated, leading to reduced filtration performance and structural integrity, while maintaining desirable properties like hydrophobicity and stiffness is challenging.
Innovation Solution
A nonwoven layer treated with a sizing agent and a hydrophobic, stiffening binder resin, followed by optional corrugation, to create a corrugated filter medium that maintains hydrophobicity and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If filter paper is corrugated to increase surface area and stiffness, then filtration efficiency and structural rigidity are improved, but hydrophobicity is reduced and water absorption increases
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the filter paper through specific sizing agent treatments. The filter paper is treated with sizing agents during the paper-making process to alter its surface properties, making it inherently hydrophobic before corrugation. This chemical parameter modification ensures that even after mechanical corrugation, the paper maintains its water-resistant properties while gaining the desired structural rigidity.
Solution Approach 2:
The patent implements preliminary action by applying sizing agents to the filter paper during the paper-making process, before the corrugation step. This pre-treatment establishes a hydrophobic baseline that protects the paper's water-resistant properties throughout subsequent mechanical processing. By addressing hydrophobicity in advance, the patent prevents the degradation that would otherwise occur during and after corrugation.
2Reliability
If hydrophobic agents are applied to base paper to achieve hydrophobicity, then water absorption is reduced, but the paper becomes more fragile and less rigid
Solution Approach 1:
The patent merges multiple functions into a single integrated paper-making process. Instead of applying hydrophobic agents as a separate post-treatment step, the sizing agents are incorporated during the paper-making process itself. This combination allows the filter paper to simultaneously develop both its hydrophobic properties and its structural integrity in one unified process, avoiding the fragility issue that arises from separate agent application.
Solution Approach 2:
The patent uses parameter changes by modifying the physical and chemical parameters of the paper structure during formation. The sizing agents alter the fiber bonding and surface characteristics during paper-making, creating a structure that is both hydrophobic and mechanically strong. This parameter modification during the formation stage ensures that hydrophobicity and structural integrity develop together rather than in conflict.
3Reliability
If filter paper is treated with sizing agents during paper-making, then hydrophobicity is maintained after corrugation, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the sizing agent treatment with the standard paper-making process into a single integrated operation. By incorporating hydrophobic sizing agents during the paper-making stage rather than as a separate post-processing step, the patent achieves hydrophobicity retention after corrugation without adding significant manufacturing complexity. The same equipment and process flow are used, just with modified chemical inputs.
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 filter medium retains hydrophobicity and filtration efficiency even after corrugation, with reduced water absorption, and can be produced efficiently using standard paper-making techniques.
Implementation Method 1
the paper is typically impregnated with hydrophobic agents. These hydrophobic agents penetrate into the base paper, coating the hydrophilic paper fibers to form a hydrophobic fiber layer at the surface of (or, in some cases, throughout) the filter medium. This imparts a resistance to, or ability to avoid, wetting/absorption of the paper by water.
Data Source
AI summary
A filter medium is provided that comprises a nonwoven layer. The nonwoven layer comprises a sizing agent and a hydrophobic, stiffening binder resin. The nonwoven layer may be corrugated. A method producing a filter medium is also provided. The filter medium may be a fuel filter, oil filter, air filter, or an electric discharge filter. The filter medium, after corrugation, pleating, or embossing, avoids or minimizes water ingress, while still allowing the filter medium to maintain its structural and filtration properties.