Polyolefin Microporous Membrane for Small Particle Filtration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Nonwoven fabric filters struggle to efficiently collect small-sized substances, require increased thickness for improved collection, and have inadequate recovery and permeation performance, leading to inefficiencies and environmental impact.
Innovation Solution
A polyolefin microporous membrane with specific Gurley value, thickness, porosity, and average pore diameter, utilizing ultra-high molecular weight polyethylene, achieving balanced collection, recovery, and permeation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the film thickness of nonwoven fabric is increased to enhance collection performance for small substances, then the collection efficiency improves, but the filter size increases
Solution Approach 1:
The invention employs a microporous membrane with controlled pore structure (average pore diameter 0.03-0.5 μm, porosity 30-80%) to achieve efficient collection of small substances (0.1-1.0 μm) without requiring increased thickness. The porous structure enables direct interception and adsorption of particles through the pore network, replacing the thickness-dependent entanglement mechanism of nonwoven fabrics.
Solution Approach 2:
The invention changes the fundamental parameters of the filtering material from nonwoven fabric to microporous membrane, controlling key parameters such as average pore diameter (0.03-0.5 μm), porosity (30-80%), and thickness (1-50 μm) to achieve optimal performance. This parameter optimization allows thin membranes to achieve high collection efficiency that previously required much thicker nonwoven fabrics.
2Device complexity
If nonwoven fabric is used for filtration, then the filter structure is simple, but the recovery rate of collected substances is insufficient
Solution Approach 1:
The microporous membrane structure with interconnected pores enables collected substances to be easily accessed and recovered from the pore network. The controlled porosity (30-80%) and pore diameter (0.03-0.5 μm) allow for efficient substance recovery while maintaining structural simplicity, overcoming the limitation of nonwoven fabrics where substances become trapped in random fiber entanglements.
3Ease of manufacture
If nonwoven fabric is used for filtration, then the manufacturing process is simple, but the permeation performance for non-target substances is inadequate
Solution Approach 1:
The invention optimizes the microporous membrane parameters including porosity (30-80%), average pore diameter (0.03-0.5 μm), and thickness (1-50 μm) to achieve high permeation performance. The controlled pore structure allows non-target substances to permeate efficiently while maintaining manufacturing feasibility, balancing productivity requirements with filtration performance.
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 membrane effectively collects small-sized substances, recovers collected materials, and allows permeation of non-target substances, enhancing efficiency and reducing environmental impact.
Implementation Method 1
a polyolefin microporous membrane including a polyolefin, having a Gurley value of 1 second/100 mL or more and 20 seconds/100 mL or less, a thickness of 5 μm or more and 25 μm or less, a porosity of 65% or more and 85% or less, and an average pore diameter of 0.05 μm or more and less than 0.30 μm
Data Source
AI summary
A polyolefin microporous membrane including a polyolefin, in which a Gurley value is 1 second/100 mL or more and 20 seconds/100 mL or less, a thickness is 5 µm or more and 25 µm or less, a porosity is 65% or more and 85% or less, and an average pore diameter is 0.05 µm or more and less than 0.30 µm.