Intermittent Point-Bonded Chemical Barrier Fabric
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Solution Overview
Problem
Existing chemical barrier fabrics for protective apparel are stiff and uncomfortable due to multiple layers being bonded over their whole surface, leading to reduced flexibility and increased stiffness, which compromises the softness and comfort of the material.
Innovation Solution
A laminated chemical barrier fabric with chemical barrier layers that are intermittently point-bonded, creating a majority un-bonded area and a minority point-bonded area, allowing for reduced intimate contact between layers and enhancing both chemical barrier properties and physical comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers are bonded over their whole surface, then chemical barrier properties are improved, but stiffness increases and comfort decreases
Solution Approach 1:
The bonding between layers is segmented into discrete point-bonded areas rather than continuous surface bonding. The calender roll has a patterned surface with bonded areas (e.g., dots, diamonds, squares) separated by un-bonded areas, creating a segmented bonding structure that maintains chemical barrier integrity while preserving flexibility and comfort.
Solution Approach 2:
Different areas of the layer interface have different bonding characteristics. Point-bonded areas provide strong adhesion for chemical barrier performance, while un-bonded areas maintain flexibility and comfort. This local differentiation of bonding quality resolves the contradiction between barrier performance and wearability.
2Strength
If multiple layers are bonded over their whole surface, then mechanical integrity is improved, but flexibility and softness are reduced
Solution Approach 1:
The continuous bonding interface is segmented into discrete point-bonded areas. This segmentation provides sufficient mechanical integrity at the bonded points while allowing the un-bonded areas to maintain the natural flexibility and softness of the individual layers, thus resolving the contradiction between strength and shape adaptability.
Solution Approach 2:
Instead of bonding the entire surface area, only partial areas are bonded. This partial action provides enough mechanical integrity for the application while avoiding excessive bonding that would compromise flexibility and softness.
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 fabric provides improved chemical barrier performance while being softer and more comfortable to wear, maintaining mechanical integrity in demanding applications without increasing stiffness.
Implementation Method 1
The calender roll may be heated to a temperature sufficient to bond the polymer material to itself or to another material such as a non-woven fabric
Implementation Method 2
The calender roll exerts pressure on the polymer material to create point bonds
Implementation Method 3
The ultrasonic applicator is passed over the surface of the fabric to be bonded. The ultrasonic applicator may be heated to a temperature sufficient to bond the polymer material to itself or to another material
Implementation Method 4
The film layers used in the manufacture of protective apparel materials provide protection to the wearer against toxic or hazardous chemicals by ensuring a low rate of molecular permeation across the two opposing faces
Data Source
AI summary
A chemical barrier fabric and a method of manufacturing the fabric is provided. The chemical barrier fabric includes at least first and second chemical barrier layers which have an interfacial region therebetween and which are intermittently point bonded providing a point-bonded area which is in the minority and an un-bonded area which is in the majority in the interfacial region. The chemical barrier layers typically comprise single layer polymer films and/or co-extruded layers. A non-woven layer may also be point-bonded to either the first or the second chemical barrier layer to give support to the fabric.