Elastomeric Strand Bonding for Flat Absorbent Surfaces
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Solution Overview
Problem
Existing elasticated materials used in clothing and absorbent articles often rely on adhesives to affix elastic strands, which increases costs and may not provide optimal performance in preventing leakage or providing a flat surface.
Innovation Solution
The development of elasticated materials with non-continuous channels, where elastomeric strands are positioned between layers of material and bonded using discrete individual bonds, eliminating the need for adhesive and creating a pattern of ridges and valleys that prevent fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to affix elastic strands to material layers, then the elastic strands are securely positioned, but the cost increases and the material may not remain flat
Solution Approach 1:
The patent removes adhesive from the bonding system entirely, replacing it with a mechanical bonding mechanism where bonds directly connect material layers through the elastomeric strand. This extraction of the adhesive component eliminates the associated costs while maintaining bonding functionality through the discrete bond structure.
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesive) with a mechanical bonding mechanism (discrete bonds). The bonds create a mechanical interlocking system where the elastomeric strand is held between bonded material layers, substituting chemical adhesion with mechanical retention.
2Reliability
If adhesive is used to affix elastic strands, then continuous coverage is achieved, but the material surface becomes non-flat and costs increase
Solution Approach 1:
The patent segments the bonding coverage from continuous (adhesive) to discrete (individual bonds). The bonds are positioned at specific intervals along the elastomeric strand, creating discrete bonding points rather than continuous coverage. This segmentation maintains positioning reliability at bond points while allowing the material surface to remain flat between bonds.
Solution Approach 2:
The patent applies bonding only where necessary (at discrete bond locations) rather than continuously across the entire surface. This local quality approach ensures reliable positioning at bond points while maintaining flat surface characteristics in non-bonded areas, eliminating the need for continuous adhesive coverage.
3Ease of manufacture
If discrete bonds are used instead of adhesive, then cost is reduced and surface flatness is maintained, but bonding coverage is non-continuous
Solution Approach 1:
The patent introduces a dynamic element (elastomeric strand) that compensates for the non-continuous bonding. The elastomeric material's inherent elasticity allows it to bridge gaps between discrete bonds, dynamically adapting to maintain secure positioning even with intermittent bonding coverage, thereby ensuring reliability without requiring continuous bonds.
4Strength
If bonds are spaced close together, then secure positioning is achieved, but the material cannot maintain a flat structure
Solution Approach 1:
The patent applies partial bonding action rather than continuous bonding. The discrete bonds provide sufficient positioning security at critical points along the elastomeric strand without the excessive action of continuous adhesive coverage. This partial bonding approach maintains structural flatness by leaving gaps between bonds where the material can remain flat.
Data Source
AI summary
Elasticated materials and methods of forming elasticated materials are disclosed. In one embodiment, an elasticated material may comprise a first layer of material, a second layer of material bonded to the first layer of material by a plurality of bonds arranged in bond groupings aligned in bond grouping rows, and an elastomeric strand extending in the lateral direction and disposed between the first layer and the second layer, the elastomeric strand extending between a first bond and a second bond of a first bond grouping with the first bond and the second bond of the first bond grouping being spaced apart in the longitudinal direction a distance less than an un-tensioned diameter of the elastomeric strand. A portion of a second bond grouping may laterally overlap the first bond grouping with the second bond grouping disposed row that is longitudinally adjacent to the row containing the first bond grouping.