Stretchable Laminate Olefin Elastomer Low Permanent Set
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Solution Overview
Problem
Existing stretchable laminates for sanitary articles, such as diapers and masks, lack sufficient fittability, leading to inadequate comfort and fit for users.
Innovation Solution
A stretchable laminate comprising an elastomer layer with an olefin-based elastomer as the main component, combined with a non-woven fabric layer, where the elastomer layer has a high content of olefin-based elastomer and a specific molecular weight range, ensuring excellent elastic recovery and low permanent set after repeated stretching, enhancing fittability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional elastomer laminates are used, then basic stretchability is achieved, but permanent set exceeds 10% after repeated stretching
Solution Approach 1:
The patent changes the molecular weight parameter of the elastomer to a specific range (MFR 5.0-25.0 g/10min) and controls the elastomer content (90-100 wt%), which resolves the contradiction by achieving both stretchability and low permanent set (10% or less after 4 cycles)
Solution Approach 2:
The patent uses a composite structure combining an elastomer layer with specific properties (olefin-based, controlled MFR) and a non-woven fabric layer, creating a multi-layer laminate that achieves both stretchability and minimal permanent set through the synergistic combination of materials
2Reliability
If elastomer content is increased to improve elastic recovery, then permanent set decreases, but material selection and processing become more restricted
Solution Approach 1:
The patent specifies a controlled MFR range (5.0-25.0 g/10min) for the olefin-based elastomer, which balances elastic recovery performance with manufacturability, allowing the elastomer to be processed while maintaining the required elastic properties and achieving permanent set of 10% or less
3Stability of the object's composition
If conventional elastomers are used, then basic elasticity is provided, but heat stability and storage stability are insufficient
Solution Approach 1:
The patent selects olefin-based elastomers with specific molecular weight characteristics (MFR 5.0-25.0 g/10min) which inherently provide both heat stability and storage stability while maintaining the required elastic performance and low permanent set characteristics
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 achieves excellent fittability and comfort by maintaining a low permanent set after repeated stretching, allowing for better fit and usability in sanitary articles like diapers and masks, while also improving heat and storage stability and reducing production complexity and costs.
Implementation Method 1
the elastomer layer comprises an elastomer resin as a main component... the stretchable laminate having a permanent set after a hysteresis test is performed four times of 10% or less... the olefin-based elastomer has a MFR of from 5.0 g/10 min to 25.0 g/10 min
Data Source
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AI summary
Provided is a stretchable laminate having excellent fittability. Also provided is an article including such stretchable laminate. The stretchable laminate of the present invention is a stretchable laminate, including: an elastomer layer; and a non-woven fabric layer arranged on at least one side of the elastomer layer, the stretchable laminate having a permanent set of 10% or less after a hysteresis test is performed four times. The article of the present invention includes the stretchable laminate of the present invention.