Corrugated Elastomeric Laminates With Segmented Adhesive Bonding
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Solution Overview
Problem
Existing elastic laminates in absorbent articles face issues with adhesive coatings hindering the contraction rates of elastic strands when stretched at high rates, leading to reduced performance.
Innovation Solution
The method involves forming corrugated substrates with alternating ridges and depressions, applying adhesive intermittently to elastic strands, and bonding them with discrete regions to form elastic laminates that allow for stretch and contraction without excessive adhesive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is coated over the full length of elastic strands to anchor and connect substrates, then attachment reliability is improved, but contraction rate of elastic strands deteriorates
Solution Approach 1:
The adhesive coating is segmented into discrete regions rather than continuous coverage. The adhesive is applied at specific intervals along the elastic strands, creating separate bonding zones that anchor the strands to substrates while leaving gaps between bonding points. This segmentation allows the elastic strands to contract freely in the regions between adhesive applications, maintaining high contraction rates while still achieving reliable attachment at the bonding locations.
2Adaptability or versatility
If corrugated substrates are used with elastic strands, then stretchability is improved, but manufacturing complexity increases
Solution Approach 1:
The substrates are pre-formed with corrugations before the elastic strands are attached. The corrugated structure is created in advance through forming or molding processes, and then the elastic strands are simply stretched and bonded to the pre-existing corrugated surface. This preliminary formation of the corrugated structure simplifies the overall manufacturing process compared to attempting to create corrugations after assembly, while still achieving the desired stretchability and elastic recovery properties.
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
This approach enhances the stretch and contraction performance of elastic laminates by reducing adhesive interference, improving the functionality of absorbent articles like diapers.
Implementation Method 1
bonding discrete lengths of the elastic strands with and between the first corrugated substrate and the second corrugated substrate with first bonds formed with the discrete regions of the first adhesive
Implementation Method 2
the elastic strands may extend through the second bonds and the elastic strands can retract and stretch through the second bonds
Data Source
AI summary
The present disclosure relates to absorbent articles and methods for manufacturing absorbent articles, and elastomeric laminates and methods for making corrugated elastomeric laminates that may be used as components of absorbent articles.