Sheet-Form Loop Fastener with Dual-Fiber Needling
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Solution Overview
Problem
The high cost of woven and knit loop fasteners limits their extensive use due to the expensive materials and processes involved in their production.
Innovation Solution
A method is developed to create a sheet-form loop product by placing a layer of staple fibers on a substrate, where smaller fibers are needled through to form loops while larger fibers remain for bonding, using forked needles that prevent the larger fibers from being needled, and anchoring the loops by fusing the larger fibers on the substrate, reducing the amount of bonding material required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If woven or knit loop fasteners are used to achieve reliable hook engagement, then the fastening reliability is improved, but the manufacturing cost increases significantly
Solution Approach 1:
The patent changes the physical parameters of the fibers by using two distinct sizes (small loop-forming fibers and large bonding fibers) and applies thermal energy to melt and bond the large fibers, transforming the material state from solid to molten and back to solid to create strong bonds without requiring expensive woven or knit constructions
Solution Approach 2:
The patent uses a composite fiber system combining two different types of staple fibers in a single layer: small-diameter fibers for loop formation and large-diameter fibers for bonding, creating a composite material structure that achieves both loop integrity and strong anchoring while reducing manufacturing complexity and cost
2Strength
If more bonding material is used to anchor loops securely, then the peel strength is improved, but the weight and cost of the fastener increase
Solution Approach 1:
The patent applies local quality by concentrating bonding material specifically at the base of each loop where anchoring is needed, rather than distributing bonding material uniformly throughout the entire fastener structure. The large fibers are positioned and melted only at the substrate interface to create localized bonding zones that provide maximum peel strength with minimum material
Solution Approach 2:
The patent extracts the bonding function from a separate bonding layer or adhesive and integrates it directly into the fiber layer itself by using the large fibers as both structural and bonding elements, eliminating the need for additional bonding materials and reducing overall weight
3Strength
If larger fibers are used for bonding, then the bonding strength is improved, but the ability to form small, precise loops is reduced
Solution Approach 1:
The patent segments the fiber population into two distinct size categories within the same layer: small fibers dedicated to loop formation and large fibers dedicated to bonding. This segmentation allows each fiber type to perform its specific function optimally without the larger bonding fibers interfering with the precision of loop formation by the smaller fibers
4Manufacturing precision
If a selective needling process is used to needle only small fibers, then the loop formation quality is improved, but the device complexity increases
Solution Approach 1:
The patent exploits the parameter difference in fiber diameter to achieve selective needling. By choosing a needle recess width that falls between the diameters of the small loop-forming fibers and large bonding fibers, the needling device naturally selects only the small fibers for loop formation without requiring complex control systems or multiple needle types
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 results in a lightweight, drapeable, and strong hook-engageable loop fastener with good peel strength, reducing production costs by minimizing the amount of bonding material needed and allowing for flexible movement of the loops.
Implementation Method 1
needling substantially only the first fibers of the layer through the substrate by penetrating the substrate with needles that drag portions of the first fibers through the substrate during needling
Implementation Method 2
anchoring the loops of the first fibers by fusing the second fibers to each other on the first side of the substrate
Data Source
AI summary
A method of making a sheet-form loop product can include placing a layer of staple fibers on a first side of a substrate, the layer of staple fibers including first staple fibers and second staple fibers that are intermingled with one another, where a diameter of the smallest circle capable of circumscribing one of the second staple fibers is greater than a diameter of the smallest circle capable of circumscribing one of the first staple fibers; needling substantially only the first fibers of the layer through the substrate by penetrating the substrate with needles that drag portions of the first fibers through the substrate during needling, leaving exposed loops of the first fibers extending from a second side of the substrate; and anchoring the loops of the first fibers by fusing the second fibers to each other on the first side of the substrate.