Accretion-Molded Water Filter Structure for High-Flow Filtration
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Solution Overview
Problem
Existing gravity-flow filters face challenges in achieving high-performance purification with limited materials and labor costs, complex assembly, and reduced flow rates due to tight pore sizes, while also failing to meet rigorous health claims and requiring expensive pleated filter media.
Innovation Solution
A low-cost, rapid accretion process using a slurry of fibers, particles, and chemicals formed on a shaped wire, followed by vacuum application and moisture reduction, resulting in a graded-density structure with enhanced surface area and pore size, allowing for high-speed mass production of filters that are hydrophilic and require no pre-wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pleated filter media with tight pore size (1-2 microns MFP) is used to meet health claims, then purification performance is improved, but flow rate is greatly reduced
Solution Approach 1:
The patent transitions from traditional planar filter media to a three-dimensional pleated structure, increasing the surface area and flow path length without increasing the footprint. This dimensional transformation allows tight pore sizes to maintain high flow rates by distributing flow across multiple pleats and creating parallel flow paths.
Solution Approach 2:
The filter medium employs varying pore sizes in different regions: tighter pores (1-2 microns MFP) are positioned in specific zones to intercept micronic heavy metal contaminants, while other zones maintain larger pores to sustain high flow rates. This spatial differentiation of pore characteristics allows simultaneous achievement of purification performance and flow rate.
2Productivity
If pleated filter media is used to achieve high flow rate and dirt-holding capacity, then filtration performance is improved, but assembly complexity and cost increase
Solution Approach 1:
The pleated filter media is pre-assembled and pre-sealed into the container during manufacturing, eliminating the need for complex field assembly operations. The pleats are formed and sealed as a complete unit before installation, significantly reducing assembly complexity and labor requirements while maintaining high flow rate and dirt-holding capacity.
3Ease of manufacture
If loose granular ingredients are used in filter, then material cost is reduced, but purification performance and ability to meet health claims is limited
Solution Approach 1:
The filter medium combines multiple materials with complementary functions: activated carbon particles for adsorption, ion-exchange resin for mineral removal, and hydrophilic fibrous matrix for structural support and flow facilitation. This composite structure achieves superior purification performance across multiple contaminant types while maintaining cost-effectiveness through the use of various material forms and sizes.
4Manufacturing precision
If tight pore structure filter paper is used to intercept micronic heavy metal contaminants, then purification is improved, but flow rate is reduced
Solution Approach 1:
The filtration function is segmented across multiple zones and layers within the filter medium. Different regions handle different contamination types: some zones with tighter pores intercept micronic heavy metals, while other zones with larger pores facilitate high flow rates. This functional segmentation allows the system to achieve both high purification performance and high flow rate simultaneously.
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 process enables filters with enhanced dirt holding capacity, high flow rates, and effective interception of contaminants, meeting stringent health claims without the need for pleating or additional mechanical support, while minimizing material and production costs.
Implementation Method 1
Vacuum is applied to cause the solid ingredients within the slurry to accumulate upon the surface of the mold
Implementation Method 2
the vacuum is used to further reduce the moisture content of the solids that have accreted to the surface of the mold
Implementation Method 3
the filter medium is either naturally hydrophilic or its pore size so large that the fluid immediately wets and penetrates the adsorbent ingredients within the filter
Implementation Method 4
the fluid immediately wets and penetrates the adsorbent ingredients within the filter
Data Source
AI summary
A process for making a water filter having the steps of hydropulping particulate and fibrous ingredients including a quantity of fibrillated cellulose with water to create a suspension, circulating the suspension in a molding tank, submerging a mold having cavities in the circulating suspension, applying a vacuum to the cavities to draw the suspension into the cavities such that the water passes through the mold and the ingredients accumulate within the cavities to form a dewatered material, ejecting the dewatered material from the mold to create a molded object, drying and curing the molded object and capping an open end of the molded object to make a filter that flows under gravity and is naturally hydrophilic with a mean flow path (MFP) as determined by porometry of less than 5 micron and preferably less than 2 micron.