Core-Sheath Air Filter for Radiation Resistance and Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional air filters with high melting temperature porous separation layers face issues with mechanical stability and leaks due to incomplete sealing during the embedding process, especially in single-layer membrane filter elements, which are prone to excessive forces and cannot be sterilized effectively.
Innovation Solution
The use of a porous air filter with a separating layer made of polyolefin core sheath fibers, where the sheath material has a lower melting temperature than the core material, ensuring complete melting and shrinkage during anchoring, thereby achieving a firm embedding and avoiding bypasses, and allowing for radiation resistance and gentle pleating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional high melting temperature porous separation layers (PET spunbonds) are used, then radiation resistance is achieved, but mechanical stability and sealing quality deteriorate due to incomplete melting during anchoring
Solution Approach 1:
The patent uses composite fibers with a core-sheath structure where the core provides radiation resistance (high melting point material) and the sheath provides good sealing properties (lower melting point material). This composite structure allows both requirements to be met simultaneously - the core maintains structural integrity under radiation while the sheath melts properly during anchoring to create secure seals.
Solution Approach 2:
Different parts of the fiber have different properties: the core material has high melting temperature for radiation resistance while the sheath material has lower melting temperature for good sealing. This local differentiation of material properties within the same fiber enables simultaneous achievement of both radiation resistance and sealing quality.
2Strength
If fiber thickness and separating layer thickness are increased to improve mechanical stability, then strength improves, but sealing quality worsens due to insufficient melting
Solution Approach 1:
The core-sheath composite fiber structure allows thicker fibers to be used for improved mechanical stability while the sheath material's lower melting point ensures complete melting and good sealing. The composite structure decouples the relationship between fiber thickness and sealing quality.
3Device complexity
If single-layer membrane filter elements are used, then device complexity is reduced, but mechanical stability and resistance to embedding forces deteriorate
Solution Approach 1:
The core-sheath composite fibers in the single-layer membrane provide enhanced mechanical stability through the combination of high-strength core material and supportive sheath material, allowing single-layer construction to achieve the mechanical stability previously requiring multi-layer structures.
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 solution provides a radiation-resistant air filter with enhanced mechanical stability and complete sealing, preventing leaks and allowing for sterile filtration without the need for autoclaving, while maintaining the integrity of hydrophobically modified membrane layers.
Implementation Method 1
the sheath material having a lower melting temperature than the core material; wherein the porous sheet has a radiation resistance of at least 20 kGy
Implementation Method 2
the porous sheet has a radiation resistance of at least 20 kGy
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3C
AI summary
The invention relates to a porous textile fabric, a filter element comprising the porous textile fabric, to a method for producing the porous textile fabric, to a method for producing the filter element and to the use of the textile fabric and the filter element.