Stretchable Laminate Weight Reduction Extension Strength
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Solution Overview
Problem
Conventional stretchable laminates for sanitary articles face challenges in reducing weight while maintaining extension strength, leading to instability during production and increased susceptibility to oil penetration.
Innovation Solution
A stretchable laminate with an elastomer layer and an olefin-based resin layer, where the olefin-based resin layer is arranged on at least one side of the elastomer layer, achieving a high extension strength-to-basis weight ratio and featuring alternately arranged stretched and non-stretched portions, which enhances oil resistance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the stretchable laminate is reduced to decrease weight, then the weight is reduced, but the extension strength decreases
Solution Approach 1:
The invention uses a composite structure consisting of an elastomer layer and an olefin-based resin layer. The elastomer layer provides extension strength and elasticity, while the olefin-based resin layer provides oil resistance and structural support. This composite material approach allows the laminate to maintain high extension strength-to-basis weight ratio even at reduced thickness, resolving the contradiction between weight reduction and extension strength maintenance.
2Weight of moving object
If the thickness of the stretchable laminate is reduced to decrease weight, then the weight is reduced, but the production stability deteriorates due to complete extension in longitudinal direction
Solution Approach 1:
The invention introduces stretched portions and non-stretched portions alternately arranged along the width direction with a specific area ratio. This local quality differentiation prevents complete extension in the longitudinal direction during feeding, maintaining production stability. The non-stretched portions act as anchor zones that prevent excessive extension, while the stretched portions provide the necessary elasticity for the application.
3Strength
If conventional stretchable laminate structures are used, then the laminate provides basic elasticity, but the oil resistance is insufficient
Solution Approach 1:
The invention employs a composite material system where the olefin-based resin layer specifically addresses oil resistance by forming a barrier against oil penetration, while the elastomer layer maintains the necessary elasticity. The combination of these two materials with different properties resolves the contradiction between providing basic elasticity and achieving sufficient oil resistance.
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 both weight reduction and increased extension strength, ensuring stable production and improved oil resistance, with the olefin-based resin layer providing excellent blocking resistance and the elastomer layer contributing to enhanced elastic performance.
Implementation Method 1
The stretchable laminate of the present invention can be excellent in blocking resistance because the stretchable laminate includes the olefin-based resin layer on at least one side of the elastomer layer
Implementation Method 2
the elastomer layer contains an olefin-based elastomer and the content of the olefin-based elastomer in the elastomer layer is from 80 wt% to 100 wt%
Implementation Method 3
the stretchable laminate has stretched portions and non-stretched portions alternately arranged along the CD direction, and wherein an area ratio (stretched portions:non-stretched portions) between the stretched portions and the non-stretched portions is from 1:0.5 to 1:3
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
Provided is a stretchable laminate that achieves both a weight reduction and an extension strength, and that can be stably produced. Also provided is an article including such stretchable laminate. The stretchable laminate of the present invention includes: an elastomer layer; and an olefin-based resin layer arranged on at least one side of the elastomer layer, wherein when a longitudinal direction of the stretchable laminate is defined as an MD direction and a direction perpendicular to the longitudinal direction is defined as a CD direction, a ratio [10% extension strength in MD direction (N/30 mm)]/[basis weight (gsm)] of the stretchable laminate is 0.14 (N/30 mm·gsm) or more.