Thermally Point-Bonded Nonwoven Allergen Barrier Laminates
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Solution Overview
Problem
Existing allergen-barrier fabrics for bedding articles face challenges in maintaining filtration efficiency and mechanical durability after repeated washings, as they often delaminate or lose their barrier function.
Innovation Solution
A laminate structure comprising a first and second nonwoven fabric layer made from a thermoplastic polymer, with a nonwoven allergen barrier layer in between, thermally point-bonded with uniformly spaced points, providing a filtration efficiency of 95% or greater after 15 washings and ensuring mechanical durability through uniform bonding and same-polymer outer layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing allergen-barrier fabrics are used for bedding articles, then they provide initial barrier function, but they delaminate or lose filtration efficiency after repeated washings
Solution Approach 1:
The patent applies composite materials by creating a multi-layer laminate structure consisting of a first nonwoven fabric layer, a thermoplastic polymer layer, and a second nonwoven fabric layer. Each layer serves specific functions: the outer layers provide structural integrity while the thermoplastic layer provides bonding and filtration. This composite structure prevents delamination during washing while maintaining filtration efficiency, as the thermoplastic polymer bonds the layers together and the specific basis weights (at least 15 gsm for outer layers) ensure mechanical durability.
2Reliability
If a nonwoven allergen barrier layer with low basis weight is used, then filtration efficiency is improved, but mechanical strength and durability are reduced
Solution Approach 1:
The patent applies local quality by assigning different basis weights to different layers of the laminate. The outer nonwoven fabric layers have a basis weight of at least 15 gsm to provide mechanical strength and durability, while the thermoplastic polymer layer has a basis weight of 6-10 gsm to provide adequate filtration without excessive weight. This localized optimization allows each layer to perform its specific function effectively - the outer layers provide structural support while the middle layer provides filtration.
Solution Approach 2:
The composite laminate structure allows the combination of layers with different basis weights and properties. The thermoplastic polymer layer (6-10 gsm) provides filtration efficiency while the outer nonwoven layers (at least 15 gsm each) provide mechanical strength. The thermal bonding between layers creates a unified structure where the weaker filtration layer is supported by stronger outer layers, achieving both filtration efficiency and mechanical durability 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 laminate maintains high filtration efficiency and mechanical durability after multiple washings, preventing delamination and ensuring effective allergen barrier performance while allowing adequate air permeability for comfort.
Implementation Method 1
the layers a), b), and c) are thermally point-bonded together with a plurality of uniformly spaced thermally bonded points
Data Source
Figure 1~2
AI summary
A laminate useful as an allergen barrier structure, comprising in order, a first nonwoven fabric layer having fibers comprising a first thermoplastic polymer and having a basis weight of at least 15 g/m2; a nonwoven allergen barrier layer having a basis weight of from 6 to 10 g/m2 and consisting of fibers comprising a second thermoplastic polymer and having an average diameter of 100 to 450 nanometers; and a second nonwoven fabric layer having fibers comprising a first thermoplastic polymer and having a basis weight of at least 15 g/m2; wherein the layers are thermally point-bonded together with a plurality of uniformly spaced thermally bonded points with the maximum spacing between adjacent bonded points being from 2 to 5 mm; and wherein the laminate has a filtration efficiency after 15 washings of 95 percent or greater.