Disposable Fastening Bond Pattern for Pressure Stability
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Solution Overview
Problem
Conventional mechanical fastening systems for disposable absorbent articles face challenges in maintaining sufficient unbonded fibers and reducing pressure fluctuations during the calendaring process, leading to poor performance and strength issues in the receiving component.
Innovation Solution
The proposed solution involves a receiving component with a specific bond pattern comprising a first and second bond line, a bond zone, and consecutive sweep regions, where the bond ratio between sweep regions is greater than or equal to 1 and less than or equal to 20, to minimize pressure fluctuations and maintain adequate unbonded areas for effective engagement with engaging components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the nonwoven web is completely bonded with fiber-to-fiber bonds, then the web strength is improved, but the receiving component becomes poorly performing because bonded areas are unengageable by engaging components
Solution Approach 1:
The patent applies local quality by creating a nonwoven web with spatially varying bonding characteristics. Specifically, the web contains both bonded areas (for strength) and unbonded areas (for engagement), with the bonding pattern strategically distributed across different regions. This allows different portions of the web to serve different functions: bonded regions provide structural integrity while unbonded regions remain available for hook engagement in the fastening system.
2Ease of operation
If large, open, unbonded areas are created to assure hook engagement, then the refastenability is improved, but the cross machine direction strength is reduced due to reduced number of fiber-to-fiber bonds
Solution Approach 1:
The patent segments the bonding pattern into discrete, distributed bond zones rather than continuous bonding. The bond pattern consists of multiple separate bonded areas scattered throughout the web, with unbonded regions in between. This segmentation allows the web to maintain sufficient bonds for strength while preserving large enough unbonded areas for hook engagement, resolving the contradiction between refastenability and strength.
3Ease of manufacture
If conventional bond patterns are used with spaced protrusions, then the manufacturing is simplified, but pressure fluctuations occur during calendaring causing overbonding or cutting through fibers
Solution Approach 1:
The patent implements a periodic bond pattern through the calendaring process, where protrusions on the calendaring roll create regularly spaced bond zones as the nonwoven web passes through. This periodic action ensures consistent pressure distribution and bonding intensity, preventing both overbonding and fiber cutting while maintaining manufacturing simplicity. The regular pattern allows for controlled, repeatable bonding throughout the web.
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 reduces pressure fluctuations, enhances the strength and quality of fiber-to-fiber bonds, and improves the refastenability and shear resistance of the receiving component, ensuring reliable performance in fastening systems.
Implementation Method 1
the fiber-to-fiber bonds are typically formed by fusing portions fibers together via, for example, heat, pressure, or sound (i.e., ultrasonic) energy
Implementation Method 2
A constant force is generally applied to one of the calendaring rolls such that as the nonwoven web passes between the calendaring rolls, the protrusions apply pressure to the nonwoven web
Implementation Method 3
the protrusions apply pressure to the nonwoven web. In general, at the location of applied pressure, at least one fiber-to-fiber bond is created
Data Source
AI summary
A mechanical fastening system having an engaging component and a receiving component. The receiving component has a first bond line, a second bond line, a bond zone, and a plurality of consecutive sweep regions. The second bond line is disposed adjacent to the first bond line such that a portion of the second bond line overlaps a portion of the first bond line. The bond zone circumscribes the first bond line and the second bond line. The plurality of consecutive sweep regions are disposed within the bond zone. At least one sweep region includes a portion of both the first bond line and the second bond line, and the remaining sweep regions include at least a portion of the first or the second bond lines. The receiving component has a bond ratio greater than or equal to about 1 and less than or equal to about 20.