Dual-Layer Fabric for Low-Surface-Tension Liquid Resistance

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Solution Overview

Problem

Existing chemical protective clothing (CPC) fails to effectively repel hazardous liquids with low surface tension while maintaining air-permeability, leading to inadequate protection and comfort for wearers.

Innovation Solution

A garment design featuring an outer layer with higher wettability and an inner layer with lower wettability, exploiting a wettability competition mechanism to enhance liquid resistance by configuring the layers to bias liquid absorption towards the outer layer and resistance towards the inner layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the outer shell fabric is coated with liquid repellent coating to increase liquid repellency, then liquid resistance is improved, but air permeability deteriorates leading to heat stress and discomfort

Engineering Contradiction:

Improveliquid resistanceVSAvoidair permeability and comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The fabric is divided into two distinct layers: an outer layer with high liquid repellency and an inner layer with high liquid absorbency. This segmentation allows each layer to perform its specific function independently, with the outer layer blocking liquids while the inner layer managing absorption, thereby maintaining air permeability and comfort without compromising liquid resistance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the fabric structure are assigned different properties: the outer layer is engineered for liquid repellency, while the inner layer is engineered for liquid absorbency. This local differentiation of qualities enables the fabric to simultaneously achieve liquid protection and breathability, resolving the contradiction between liquid resistance and air permeability.

Inventive Principle:

Principle #3Local quality

2Reliability

If the inner layer thickness is increased to improve liquid absorption capacity, then liquid resistance is improved, but fabric weight and thickness increase reducing comfort

Engineering Contradiction:

Improveliquid absorption capacityVSAvoidfabric weight and thickness

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The fabric structure segments the liquid protection function between two layers: the outer layer handles liquid repellency and the inner layer handles liquid absorption. This segmentation allows the inner layer to be thinner and lighter than a single-layer design would require, as it only needs to absorb liquids that penetrate the outer layer, thereby reducing weight and thickness while maintaining adequate absorption capacity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The outer layer acts as an intermediary between the liquid environment and the inner layer. By intercepting and repelling liquids before they reach the inner layer, the outer layer reduces the burden on the inner layer, allowing it to be thinner and lighter while still providing sufficient absorption capacity for any penetrating liquids.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If conventional single-layer fabrics are used to simplify design, then manufacturing is easier, but liquid resistance against low surface tension chemicals is insufficient

Engineering Contradiction:

Improvedesign simplicityVSAvoidliquid repellency against low surface tension liquids

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The fabric is segmented into two functional layers: the outer layer provides liquid repellency specifically designed to resist low surface tension chemicals, while the inner layer provides liquid absorbency. This segmentation enables effective protection against hazardous liquids that would penetrate conventional single-layer fabrics, while maintaining relative design simplicity through the use of standard fabric construction techniques.

Inventive Principle:

Principle #1Segmentation

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 garment significantly increases resistance to liquid penetration, especially for low surface tension liquids, while maintaining breathability and comfort, with potential improvements in penetration prevention by 200 to 1000 times compared to existing fabrics, and reduced thickness and weight.

Implementation Method 1

the configuration of inner and outer layers creates a wettability difference that biases the outer layer to absorb the liquid and the inner layer to resist penetration of the liquid

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

each of the inner layer and the outer layer on their own are wettable by the liquid; wherein the inner layer has a lower wettability to the liquid than the outer layer

Methodology Applied

Scientific EffectWettability: Wetting

Data Source

PatentUS12402677B2Fabric resistant to liquid penetration

Publication Date: 2025.09.02 COMMONWEALTH OF AUSTRALIA

AI summary

Described embodiments generally relate to a garment for resisting penetration of a liquid. The garment comprises an outer layer, and an inner layer. The inner layer is configured to be positioned closer to the skin of a wearer than the outer layer when the garment is being worn. Each of the inner layer and the outer layer on their own are wettable by the liquid, and the inner layer has a lower wettability to the liquid than the outer layer. The configuration of inner and outer layers creates a wettability difference that biases the outer layer to absorb the liquid and the inner layer to resist penetration of the liquid in a direction moving from the outer layer to the inner layer.