Foam-Finished Loop Fabric for Strength and Surface Bonding
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Solution Overview
Problem
Existing methods face challenges in providing lightweight loop materials for hook-and-loop fasteners with sufficient mechanical strength and surface properties, particularly in maintaining functionality and anchoring during use, and in efficiently imparting desired bulk and surface properties to fabrics.
Innovation Solution
A method involving the application of a foam containing a liquid binder and an activatable powder to the fabric surface, allowing the binder to flow into fiber interstices and dry, while the powder remains on the surface to be activated for bonding or altering surface properties, enhancing mechanical strength and surface adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating is applied to the fabric surface to provide surface properties, then surface properties are improved, but the loops may be covered and rendered non-functional
Solution Approach 1:
The coating composition is applied selectively to different regions of the fabric. The ground portion receives the full coating application for enhanced surface properties, while the loop portions are protected from coating coverage, maintaining their hook-engageable functionality. This localized application strategy resolves the contradiction by providing surface properties where needed without compromising loop function.
2Strength
If a binder is applied to anchor loop fibers, then mechanical strength is improved, but the loops may be covered and rendered non-functional
Solution Approach 1:
The binder within the coating composition is applied selectively to the ground portion of the fabric, anchoring ground fibers to provide mechanical strength without covering the loop fibers. The foam application method and subsequent collapse process ensure binder deposition in interstices of the ground portion while leaving loop portions exposed and functional.
3Reliability
If powder is applied to the fabric surface for bonding, then bonding capability is improved, but the powder may be lost during processing
Solution Approach 1:
The liquid binder acts as an intermediary that adheres the powder particles to the fabric ground portion. As the foam collapses and the binder flows into interstices, it carries powder particles with it and secures them in place. This intermediary mechanism ensures powder retention during subsequent processing while maintaining bonding capability on the fabric surface.
4Strength
If the fabric is stabilized with binder coating, then mechanical strength is improved, but air-permeability may be reduced
Solution Approach 1:
The binder coating is applied selectively to the ground portion of the fabric, reinforcing this structural component without covering the loop portions. This localized reinforcement provides mechanical strength to the ground while preserving the porosity and air-permeability characteristics of the loop regions, resolving the contradiction between strength enhancement and breathability maintenance.
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 method effectively stabilizes and strengthens the fabric, enabling it to resist being pulled out and providing an activatable surface for bonding, while maintaining air-permeability and flexibility, thus addressing the mechanical strength and surface property challenges.
Implementation Method 1
allowing the liquid binder to flow into pores of the fabric and coat fiber interstices of the fabric as the foam collapses
Implementation Method 2
drying the binder coating the fiber interstices, so as to stabilize the fabric
Data Source
AI summary
A fabric, such as a loop fastener material, is finished by applying a foam to a surface of the fabric, the foam containing both a liquid binder and a powder. The binder is allowed to flow into pores of the fabric and coat fiber interstices of the fabric as the foam collapses, and is dried to stabilize the fabric. The powder is of a particle size selected to cause most of the powder to remain on the surface of the fabric while the binder is dried to bond the powder to the fabric surface. The powder, as bonded to the fabric surface, is activatable, such as by heat or RF or UV energy, to adhere the stabilized fabric to another surface or to provide a desired surface property.