Loop Fastening Material with Optimized Fiber Volumetric Ratio
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Solution Overview
Problem
Existing fastening systems for lightweight, disposable garments like diapers face challenges in achieving cost-effectiveness while maintaining performance and load-carrying capacity, with issues related to fiber content, dimensional stability, and compatibility with substrates.
Innovation Solution
A touch fastener loop material with a specific combination of characteristics, including a Maximum Fiber Volumetric Ratio (MFVR) between 5 and 25% and a Critical Fiber Volume Percentage (CFVP) below 60%, which enhances engageability, strength, and breathability, achieved through a non-woven web of fibers with tenacious loops and multicomponent fibers bonded by resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fiber content is reduced to lower cost, then manufacturing cost decreases, but load-carrying capacity and dimensional stability deteriorate
Solution Approach 1:
The patent employs composite fiber structures combining different fiber types (e.g., spandex with other fibers) to achieve high strength-to-weight ratios. This allows reduced overall fiber content while maintaining load-carrying capacity through the synergistic properties of the composite material system.
Solution Approach 2:
The patent creates localized regions of high fiber density and bonding strength at critical areas (loop formation zones, bonding points) while maintaining lower fiber content in non-critical areas. This local quality differentiation optimizes strength where needed while reducing overall material usage and cost.
2Ease of manufacture
If fiber content is reduced to lower cost, then manufacturing cost decreases, but dimensional stability deteriorates
Solution Approach 1:
The patent incorporates preliminary bonding actions during the needling process where fibers are mechanically interlocked and thermally bonded before final product completion. This preliminary stabilization prevents dimensional changes during subsequent handling and use, maintaining stability even with reduced fiber content.
Solution Approach 2:
The patent utilizes parameter changes in fiber properties (tenacity, melting point, elasticity) and processing conditions (temperature, pressure, needle penetration depth) to achieve optimal dimensional stability. By carefully controlling these parameters, the patent maintains stability with lower fiber content through enhanced individual fiber performance.
3Weight of moving object
If loop material is made lighter, then weight and cost decrease, but engagement performance deteriorates
Solution Approach 1:
The patent optimizes loop geometry parameters (height, thickness, spacing) and fiber properties (tenacity, diameter) to maximize engagement performance per unit weight. By precisely controlling these parameters, lighter loop materials achieve equal or superior engagement performance through more efficient structural design.
Solution Approach 2:
The patent uses composite fiber structures with high strength-to-weight ratios to create lighter loop materials that maintain engagement performance. The composite nature allows reduced weight while preserving the mechanical properties necessary for reliable hook engagement.
4Strength
If more fibers are used to improve strength, then load-carrying capacity increases, but manufacturing cost increases
Solution Approach 1:
The patent concentrates fiber content and bonding strength in localized critical regions (loop formation zones, bonding points) rather than uniformly distributing fibers throughout the entire material. This local quality approach achieves high load-carrying capacity at critical points while minimizing overall fiber usage and manufacturing cost.
Solution Approach 2:
The patent employs composite fiber structures with high strength-to-weight ratios, allowing reduced overall fiber content while maintaining load-carrying capacity through the superior mechanical properties of the composite material system.
5Reliability
If loop structures are made more dense, then engagement performance improves, but air permeability deteriorates
Solution Approach 1:
The patent creates localized regions of high loop density and bonding in critical engagement zones while maintaining lower density and higher porosity in non-critical areas. This local quality differentiation preserves air permeability in breathable regions while ensuring sufficient engagement performance in functional zones.
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 a cost-efficient, highly engageable, and durable fastening material with improved peel and shear strength, air permeability, and dimensional stability, suitable for disposable applications.
Implementation Method 1
using heat and pressure to locally soften and bond polymer of the fibers directly to the substrate and adjacent fibers
Implementation Method 2
using heat and pressure to locally soften and bond polymer of the fibers directly to the substrate and adjacent fibers
Implementation Method 3
a non-woven web of fibers forming both a base and a field of hook-engageable loops
Implementation Method 4
multicomponent fibers bonded by resin
Data Source
Figure 1~2
Figure 3~3B
Figure 4A~4D
AI summary
A touch fastener loop material has a non-woven web of fibers forming both a base and a field of high-tenacity hook-engageable loops extending outward from one broad side of the base. The fibers are distributed such that the field of loops has a particular fiber volume distribution as a function of elevation above the base.