Breathable Laminated Loop Tape for Diaper Fasteners
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Solution Overview
Problem
Conventional hook-and-loop fasteners used in diapers are not breathable, lack appealing visual and feel properties, and form airtight areas, which are undesirable for consumer comfort.
Innovation Solution
A laminated loop tape with a nonwoven textile support layer and a partially transparent knitted cover layer, where the support layer is printed on its inner face using a rotary printing process, and the layers are adhered with a pattern of adhesive and non-adhesive areas to enhance flexibility, breathability, and print protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a plastic foil support layer is used in the laminated loop tape, then the structural stability and printability are improved, but the breathability and textile feel are worsened
Solution Approach 1:
The patent applies porous nonwoven textile material as the support layer instead of solid plastic foil. This porous structure allows air permeability while maintaining structural stability and providing a textile-like feel that is comfortable for diaper applications.
Solution Approach 2:
The patent uses a composite structure combining nonwoven textile support layer with knitted cover layer. This composite material approach integrates the advantages of both materials: the nonwoven provides stability and breathability, while the knitted layer provides loop formation and flexibility.
2Manufacturing precision
If a plastic foil support layer is used in the laminated loop tape, then the printability is improved, but the textile feel and flexibility are worsened
Solution Approach 1:
The porous nonwoven textile support layer provides both printability for branding/design and a natural textile feel that is comfortable against the skin, replacing the cold, hard plastic foil surface.
Solution Approach 2:
The patent changes the material parameters of the support layer from plastic foil to nonwoven textile, fundamentally altering the surface properties to provide both printability and textile-like tactile characteristics.
3Strength
If the support layer is made of stiff material, then the structural integrity is improved, but the flexibility and consumer comfort are worsened
Solution Approach 1:
The porous nonwoven structure provides structural integrity through its fibrous network while inherently offering flexibility and softness that stiff materials cannot provide, improving consumer comfort.
Solution Approach 2:
The composite of nonwoven support layer and knitted cover layer creates a flexible yet structurally sound fastening system that moves naturally with the diaper and provides comfort.
4Strength
If adhesive is applied over the full confronting faces of the layers, then the bonding strength is improved, but the hook engagement and loop mobility are worsened
Solution Approach 1:
The adhesive application is segmented into specific patterns rather than continuous coverage. This segmentation creates adhesive-free zones where hooks can effectively engage with loops while maintaining overall bonding strength through strategically placed adhesive regions.
Solution Approach 2:
Different regions of the tape have different adhesive properties: some areas have adhesive for bonding layers, while other areas are adhesive-free to allow hook-loop engagement. This local differentiation optimizes both bonding and fastening functions.
Data Source
AI summary
A laminated loop tape for a hook-and-loop fastener. The tape has a nonwoven textile support layer having an inner face, printing on the inner face, an at least partially transparent knitted cover layer having an inner face bearing on the support-layer inner face and an outer face provided with loops, and adhesive between the inner faces adhering the layers to each other.