Extensible Laminar Material for Sanitary Articles
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Solution Overview
Problem
Existing extensible laminar materials used in sanitary products, such as side panels, face limitations in achieving high elastic extensibility and maintaining breathability, particularly in applications like incontinence products where a 200% extension is required without excessive looseness or sliding issues.
Innovation Solution
A laminar material structure comprising two outer non-woven fabric layers with an elastically extensible material interposed between them, where the extensible layer is stretched to 200% and anchored with adhesive strips, and then ultrasonically welded to create a breathable and coherent sandwich structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional extensible laminar materials are used in side panels, then the material provides basic extensibility and breathability, but the degree of elastic extensibility is insufficient and the material becomes excessively loose when maximum extension is reached
Solution Approach 1:
The patent employs a composite laminar structure consisting of three distinct layers: an extensible material layer (providing 200% elastic extensibility), a non-woven fabric layer (providing structural stability), and a breathable membrane layer (providing breathability). This composite construction allows each layer to contribute its specific properties, achieving high extensibility while preventing excessive looseness through the stabilizing non-woven fabric layer that maintains structural integrity at extended states.
2Length of moving object
If the extensible material is stretched to achieve high extension, then the degree of elastic extensibility increases, but the breathability of the material deteriorates
Solution Approach 1:
The patent segments the functional requirements by creating separate layers: the extensible material layer handles the 200% elastic extension requirement, while the breathable membrane layer specifically addresses breathability. This segmentation allows the extensible layer to be optimized for stretch without compromising breathability, as the membrane layer provides dedicated breathability functions regardless of the extension state of the underlying extensible material.
3Stability of the object's composition
If adhesive strips are used to anchor the extensible layer, then the coherence of the sandwich structure is maintained, but the manufacturing complexity increases
Solution Approach 1:
The patent introduces adhesive strips as an intermediary element between the extensible material layer and the non-woven fabric layer. These adhesive strips serve as mediators that securely bond the layers together while allowing for relatively simple manufacturing processes. The adhesive strips are applied in a controlled manner during lamination, providing reliable anchoring of the extensible layer without requiring complex assembly operations or specialized manufacturing equipment.
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 provides high elastic extensibility up to 200% while maintaining breathability and resistance to further extension, ensuring a secure and comfortable fit in sanitary products without excessive looseness or sliding.
Implementation Method 1
the second non-woven fabric layer (104) and the extensible material layer (106) are ultrasonically welded
Implementation Method 2
anchored with adhesive strips
Data Source
AI summary
An extensible laminar material 100 includes an extensible layer 106 coupled to at least one laminar layer 102, 104. The extension of the extensible layer 106 starting from a non-extended condition determines the extension of the laminar layer(s) 102, 104 while the return of the extensible layer 106 toward the non-extended condition determines the pulling of the laminar layer(s) 102, 104 into a wrinkled condition. The extensible layer 106 and at least one laminar layer 102, 104 are connected by welding to avoid their detachment. The extensible layer 106 is anchored to at least one laminar layer 102, 104 by lines of spread adhesive 108, 108′. The welded connection is absent in correspondence of the lines of spread adhesive 108, 108′. Preferably, the material is in the form of a web 100 extensible transversally to the longitudinal extension of the web with the lines of spread adhesive 108, 108′ extending along the sides of the web.