Elastic Laminates With Localized Reinforcement for Secure Edge Bonding
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Solution Overview
Problem
Existing elastic laminate assembly operations result in unstretched film portions being bonded, which are costly and detract from the aesthetic and tactile appearance, despite the need for high basis weights to secure these portions during use.
Innovation Solution
A method involving stretching central regions of elastic materials in the cross direction, positioning reinforcement layers between unstretched edge regions, and ultrasonically bonding these layers with substrates to form elastic laminates, allowing for low basis weight films and nonwovens while ensuring secure bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nonwovens and films with relatively high basis weights are used to ensure secure bonding of unstretched portions, then bonding reliability is improved, but material cost increases and aesthetic appearance deteriorates
Solution Approach 1:
The patent applies local quality by concentrating the bonding function in specific localized regions rather than using high basis weight materials throughout. Bonding bars create discrete bonding zones at intervals along the elastic laminate, allowing lightweight nonwoven materials to be used in non-bonding areas while maintaining secure attachment only where needed. This resolves the contradiction by providing reliable bonding through targeted reinforcement rather than uniformly heavy materials.
Solution Approach 2:
The bonding function is segmented into discrete bonding bars rather than continuous bonding across the entire laminate. This segmentation allows the use of lighter materials between bonding points while maintaining security through distributed bonding zones. The bonding bars create multiple localized attachment points that collectively provide the necessary reliability without requiring high basis weight materials throughout the entire structure.
2Reliability
If nonwovens and films with relatively high basis weights are used to ensure secure bonding of unstretched portions, then bonding reliability is improved, but aesthetic appearance and tactile impression deteriorate
Solution Approach 1:
By localizing bonding to specific bar-shaped regions, the patent allows the majority of the elastic laminate surface to consist of lightweight, aesthetically pleasing materials. The bonding bars themselves are narrow and discrete, minimizing their visual and tactile impact while providing sufficient mechanical security. This resolves the contradiction by confining the functional (but less aesthetic) bonding regions to small localized areas.
Solution Approach 2:
Segmenting the bonding function into discrete bars rather than continuous heavy material layers allows most of the laminate surface to maintain its aesthetic properties. The segmented bonding bars create a pattern that can be optimized for both function and appearance, providing security where needed while preserving visual appeal in the intervening areas.
3Strength
If unstretched portions of film are bonded to nonwovens, then structural integrity is improved, but material cost increases
Solution Approach 1:
The patent provides structural integrity through localized bonding bars rather than requiring high basis weight materials throughout the entire laminate. The bonding bars create discrete zones of high strength attachment, sufficient to secure the unstretched film portions during use. This resolves the contradiction by concentrating structural reinforcement only where mechanically necessary rather than uniformly across all materials.
Solution Approach 2:
Segmenting the structural reinforcement into discrete bonding bars allows the use of lighter, lower-cost materials in the non-bonding regions. The multiple segmented bonding points collectively provide the necessary structural integrity to secure film portions while reducing overall material costs compared to using heavy materials throughout the entire laminate structure.
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 method enables the construction of elastic laminates with improved aesthetic and tactile properties using lower-cost materials by securing unstretched film portions effectively, enhancing the laminate's structural integrity.
Implementation Method 1
forming an elastic laminate by ultrasonically bonding the reinforcement layer together with the edge regions of the elastic materials and the substrates
Data Source
AI summary
The present disclosure relates to elastic laminates and methods for assembling elastic laminates that may be used to make absorbent article components. Elastic laminates may include one or more reinforcement layers positioned between unstretched portions of elastic materials and substrates to which the elastic materials are bonded.