Elastic Laminate Chassis for Absorbent Articles
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Solution Overview
Problem
Pant type absorbent articles face challenges in combining strength, comfort, fit, and a soft, cloth-like appearance, with existing elastic laminates often breaking when pulled up or down.
Innovation Solution
A pant type absorbent article with a core region and chassis region, featuring an elastic laminate composed of nonwoven and/or film layers, where the elastic laminate constitutes at least 20% of the surface area, providing specific tensile strength and elasticity properties, and a breathable elastic film layer between fibrous layers, allowing for stretchability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If elastic laminate is used in chassis region to provide stretchability and comfort, then ease of operation is improved, but reliability deteriorates due to breaking when pulled up
Solution Approach 1:
The patent uses a composite laminate structure consisting of an elastic film layer bonded between two nonwoven fabric layers. This composite material combines the stretchability of the elastic film with the strength and stability of the nonwoven fabrics, enabling the chassis region to withstand pulling forces during donning and doffing while maintaining comfort and fit.
2Ease of operation
If elastic laminate covers large surface area to provide comfort and fit, then ease of operation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the absorbent article into distinct functional regions: a core region containing the absorbent core and a chassis region surrounding it. The elastic laminate is specifically applied to the chassis region, allowing comfortable fit and ease of operation without requiring the entire article to be manufactured with complex elastic laminate structures.
3Ease of operation
If nonwoven layers are stretched during bonding to create elasticity, then ease of operation is improved, but strength deteriorates due to fiber breaking
Solution Approach 1:
The patent applies a controlled stretching ratio during the bonding process that is sufficient to create the desired elastic properties and stretchability in the finished product, but not so excessive as to cause significant fiber breaking and strength loss. This optimized partial action achieves the right balance between elasticity and strength retention.
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 solution enhances the strength and comfort of pant type absorbent articles, enabling easy donning and doffing while maintaining a soft, cloth-like feel and appearance, with improved tensile strength and breathability.
Implementation Method 1
an elastic laminate composed of at least two web shaped material layers in the form of nonwoven and/or film layers, at least one of said web shaped materials being an elastic material
Implementation Method 2
the elastic film layer is breathable
Data Source
AI summary
A pant type absorbent article having a core region (3) comprising an absorbent core (2) and a chassis region (4) surrounding the core region. The article in at least a part of the chassis region (4) comprises a coversheet (10) in the form of an elastic laminate (11) constituting the sole component of the chassis (4) in at least 20% of the total surface area of the article (1), said elastic laminate having a tensile strength of at least 15 N/25 mm both in the longitudinal (y) and the transverse (x) direction of the article and a tensile strength in transverse direction (x) of the article which is no more than 2.5 times and preferably no more than 2 times higher than the tensile strength in the longitudinal direction (y) of the article. The force required to extend the elastic laminate 10% in the longitudinal direction (y) of the article should be no more than 5N/25mm.