Needled Loop-Engageable Fasteners for Lower-Cost Hook Closure
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Solution Overview
Problem
The high cost of woven and knit hook fasteners limits their extensive use due to the expense of manufacturing hook-forming filaments in fabric structures.
Innovation Solution
A method involving placing staple fibers on a substrate, needling them to create loops on one side, removing loop ends to form stems, and melting stem ends to create loop-engageable heads, while anchoring fibers on the other side to form a sheet-form loop-engageable fastener product with enhanced distribution and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If woven and knit hook fasteners are used, then closure strength is achieved, but manufacturing cost increases
Solution Approach 1:
The patent changes the manufacturing parameters from traditional woven/knit processes to a nonwoven needling process with controlled fiber insertion. By adjusting needle density, fiber orientation, and anchoring parameters, the invention achieves comparable closure strength at lower manufacturing cost through a more efficient production method.
Solution Approach 2:
The invention replaces the complex mechanical weaving or knitting mechanisms with a simpler needling process where fibers are mechanically inserted and anchored into a nonwoven substrate. This substitution eliminates the complexity of woven/knit structures while maintaining the essential hook-loop engagement functionality.
2Strength
If conventional fastener manufacturing methods are used, then product strength is maintained, but surface area is limited
Solution Approach 1:
The patent segments the fastener into discrete hook elements formed from individual staple fibers rather than continuous filaments. This segmentation allows for greater flexibility in distributing fastener elements across large surface areas while maintaining localized strength through proper fiber anchoring and density control.
Solution Approach 2:
The invention transitions from the planar structure of woven/knit fasteners to a three-dimensional nonwoven matrix with vertically anchored fibers. This dimensional change enables coverage of larger surface areas while maintaining engagement strength through the vertical anchoring mechanism and optimized fiber distribution.
3Ease of manufacture
If material quantity is reduced to lower cost, then manufacturing cost decreases, but product flexibility is compromised
Solution Approach 1:
The patent applies local quality by creating regions of varying fiber density and anchoring depth within the nonwoven structure. Areas with higher fiber density provide strength and flexibility, while areas with optimized anchoring provide engagement functionality. This localized variation allows cost reduction through material optimization without compromising overall product flexibility.
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 method produces inexpensive, drapeable, and strong loop-engageable fastener products with larger surface areas, reducing material costs and improving bonding strength, enabling wider applications such as siding and roofing.
Implementation Method 1
a melting station configured to melt the free ends of the stems to form loop-engageable heads at the ends of at least some of the stems
Implementation Method 2
a lamination station to anchor fibers forming the loops by fusing the fibers to each other on the first side of the substrate
Data Source
AI summary
A method of making a sheet-form loop-engageable fastener product includes placing a layer of staple fibers on a first side of a substrate, needling fibers of the layer through the substrate to form loops extending from a second side of the substrate, removing end regions from at least some of the loops to form stems, and forming loop-engageable heads at free ends of at least some of the stems.