Filter Element With High MFR Binder for Low-Pressure Lead Removal
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Solution Overview
Problem
Existing filter elements for gravity-driven filtration systems face challenges in effectively removing lead from drinking water while maintaining high flow rates and low energy consumption, as they often require high binder amounts and energy for manufacturing, leading to impractical flow resistance and inefficiency in meeting NSF standard 53 requirements.
Innovation Solution
A filter element with a porous body made of bonded matter, using a binder with a Melt Flow Rate (MFR) greater than 1 g/10 min, and a Mean Flow Pore size (MFP) between 0.1 and 11 μm, which allows for efficient lead removal with reduced binder usage and energy, enabling effective filtration at low pressure differentials and high flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a filter element uses a binder with low Melt Flow Rate (MFR < 0.1 g/10 min) to achieve strong binding, then the structural strength is improved, but the manufacturing energy consumption increases and flow resistance becomes impractically high
Solution Approach 1:
The patent changes the key parameter of binder MFR from very low (<0.1 g/10 min) to higher (>1 g/10 min), which fundamentally alters the binding mechanism. This parameter change allows the binder to flow more easily during manufacturing, reducing the energy and pressure needed for compression, while still providing adequate structural strength after bonding.
2Manufacturing precision
If the filter element uses small particle sizes to achieve fine pore structures, then the filtration precision is improved, but the flow resistance increases and porosity decreases
Solution Approach 1:
The patent applies local quality by using a higher MFR binder that creates more uniform local bonding between particles. This allows smaller particles to be bound effectively without requiring excessive compression pressure, maintaining both fine pore structures for filtration precision and adequate porosity for flow rate.
3Strength
If high compression pressure is applied during manufacturing to achieve dense structure, then the structural strength is improved, but the porosity decreases and flow resistance increases
Solution Approach 1:
The patent substitutes the mechanical compression system with a thermal-flow based binding system. By using a binder with higher MFR that flows more easily under heat and pressure, the need for high compression forces is reduced. The binder flows into particle voids and solidifies, creating strong bonds without requiring the high mechanical compression that would reduce porosity.
4Ease of operation
If the filter element is designed for gravity-driven systems with low pressure differential, then the ease of operation is improved, but the ability to meet NSF standard 53 lead removal requirements becomes difficult
Solution Approach 1:
The patent uses composite materials combining activated carbon particles with a higher MFR binder. This composite structure creates a matrix that maintains open pore channels for high flow rates while the activated carbon provides the adsorption capacity needed for lead removal, achieving both ease of operation and reliability.
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 element achieves significantly lower lead concentrations in effluent water, meeting NSF 53 standards with reduced flow resistance and lower manufacturing energy costs, making it suitable for gravity-driven systems and cost-effective production.
Implementation Method 1
The binder is made of a meltable material, in particular a thermoplastic material
Implementation Method 2
The layered structure is subjected to at least a heat treatment
Implementation Method 3
at least one material for binding lead
Data Source
AI summary
A filter element comprises a porous body. The porous body is made of bonded matter, including: at least one material for binding lead; and at least a binder having a Melt Flow Rate, MFR, of more than 1 g/10 min. The porous body has a Mean Flow Pore size, MFP, in a range of between 0.1 and 11 μm.