Nanofiber Filter Medium Structural Integrity High Pressure Backwashing

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Solution Overview

Problem

Current filter media face challenges in maintaining shape and structural integrity during water treatment, especially during high-pressure backwashing, which can lead to deformation, damage, and reduced filtration efficiency and flux.

Innovation Solution

A filter medium is designed with a nanofiber web and porous supports that satisfy specific weight and thickness conditions, ensuring mechanical strength and adhesion, and includes a fluorine-based compound for enhanced chemical resistance, allowing for effective filtration and durability even under high pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high pressure is applied to wash the filtration medium, then foreign substances are removed, but the filtration medium may be damaged or delaminated

Engineering Contradiction:
Improvefiltration functionVSAvoidstructural integrity
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

A support layer is provided behind the nanofiber web to cushion and distribute the high pressure applied during backwashing, preventing direct transmission of stress that would cause damage or delamination. The support layer acts as a protective buffer that maintains structural integrity while allowing effective cleaning.

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The filtration medium is constructed as a composite structure combining nanofiber web with support layers, where each layer has different functional properties. The nanofiber web provides filtration function while the support layers provide mechanical strength and pressure distribution, resolving the contradiction between filtration effectiveness and structural durability.

Inventive Principle:
Principle #40Composite materials

2Reliability

If high pressure is applied during filtration, then filtration function is enhanced, but channels may not be smoothly secured and flux is reduced

Engineering Contradiction:
Improvefiltration functionVSAvoidflux
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The filtration medium is segmented into multiple functional layers with different pore structures and pressure resistance characteristics. The nanofiber web provides fine filtration while support layers maintain channel openness, allowing the system to handle high pressure without flux reduction.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Different regions of the filtration medium have different structural properties optimized for their specific functions. The nanofiber web has dense structure for filtration while support layers have more open structure for pressure distribution and channel maintenance, enabling simultaneous high filtration function and flux.

Inventive Principle:
Principle #3Local quality

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 maintains structural integrity and high filtration efficiency, securing high flux and extended use periods, while preventing delamination and film damage during backwashing, making it suitable for various water treatment applications.

Implementation Method 1

a nanofiber web (111, 112) having a three-dimensional network structure in which one strand or a plurality of strands of nanofibers are randomly and three-dimensionally stacked

Methodology Applied
Scientific EffectPhysical separation through porous structure: Filter (physical)

Implementation Method 2

A filter medium is designed with a nanofiber web and porous supports that satisfy specific weight and thickness conditions, ensuring mechanical strength and adhesion, and includes a fluorine-based compound for enhanced chemical resistance

Methodology Applied
Scientific EffectChemical resistance: Hydrophobe

Data Source

PatentUS11839855B2Filter medium, manufacturing method therefor, and filter unit including same
Publication Date: 2023.12.12 AMOGREENTECH CO LTD
  • US11839855B2 patent drawing
  • US11839855B2 patent drawing
  • US11839855B2 patent drawing

AI summary

A filter medium is provided. According to one embodiment of the present invention, the filter medium is implemented by including: a porous second support and a nanofiber web which are sequentially stacked on each of an upper portion and a lower portion of a first support; and a channel through which a filtrate filtered in the nanofiber web flows in a direction of the first support, wherein the first support, the second support, and the nanofiber web satisfy predetermined conditions on a basis weight and a thickness of each layer. In a water treatment operation of the filter medium, the shape, structural deformation, and damage of the filter medium can be minimized, excellent filtration efficiency can be implemented, and a channel can be smoothly secured, thereby securing high flux. In addition, even at high pressure applied during backwashing, the filter medium has an extended use period due to excellent durability of the filter medium. Accordingly, the filter medium can be variously applied in various water treatment fields.