PPS-Based Hook-and-Loop Fastener to Prevent Engaging Element Pull-Out
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Solution Overview
Problem
Existing flame-retardant hook-and-loop fasteners face issues with engaging elements being pulled out from the base fabric during repeated engagement and peeling, and they often exhibit waving in the up-and-down direction, which complicates the production of wide fasteners and affects the consistency of the engaging force.
Innovation Solution
A flame-retardant hook-and-loop fastener is developed using a base fabric woven from PPS-based multifilament yarns, heat-fusible core-sheath type multifilament yarns, and yarns for engaging elements. The process involves heat-shrinking the heat-fusible yarns to tighten the engaging elements and using a specific method to slide and press the rear face of the base fabric after heat treatment, which reduces waving and enhances the fixation of engaging elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a back coating resin liquid is applied to the rear face to prevent engaging elements from being pulled out, then the engaging elements are fixed more securely, but the hook-and-loop fastener loses flexibility and becomes rigid
Solution Approach 1:
The patent removes the back coating resin layer entirely, replacing it with a weaving structure where the yarn for engaging elements is integrated into the base fabric during the weaving process. This extraction of the harmful coating while maintaining the fixation function through structural integration resolves the contradiction between reliability and flexibility.
Solution Approach 2:
The patent introduces a heat-fusible yarn as an intermediary component during the weaving process. This heat-fusible yarn acts as a temporary mediator that holds the engaging elements in position during manufacturing, then is removed through heat treatment, leaving no rigid coating residue that would compromise flexibility.
2Reliability
If a back coating resin liquid is applied to the rear face to prevent engaging elements from being pulled out, then the engaging elements are fixed more securely, but the texture of the woven fabric is largely deteriorated
Solution Approach 1:
The patent extracts and eliminates the back coating resin layer that deteriorates fabric texture. Instead, it uses an integrated weaving structure where engaging elements are formed as part of the base fabric, preserving the natural texture and appearance of the woven material while maintaining secure fixation.
3Area of stationary object
If the hook-and-loop fastener is made wider, then more area is available for engagement, but waving in the up-and-down direction occurs making production difficult
Solution Approach 1:
The patent applies preliminary tensioning and heat treatment during the manufacturing process to establish flatness before the fastener is completed. By pre-treating the wide fastener structure while it is still being manufactured, the waving is prevented from developing, allowing large-area fasteners to be produced with consistent flatness.
4Object-affected harmful factors
If flame retardancy is imparted by impregnating or coating the front face with a resin including flame-retardant, then flame retardancy is improved, but the flame-retardant is peeled off or disappears due to washing
Solution Approach 1:
The patent uses PPS-based multifilament yarn that inherently possesses both flame-retardant properties and structural functionality as part of the base fabric. This multi-functional yarn integrates flame protection into the fabric structure itself, ensuring the flame-retardant effect is durable and cannot be peeled off or washed away.
Solution Approach 2:
The patent employs composite PPS-based multifilament yarn that combines flame-retardant properties with structural integrity. This composite material approach embeds flame retardancy within the fabric structure rather than applying it as a separate coating, ensuring long-term durability and reliability of the flame-retardant effect.
5Reliability
If a polyurethane-based or polyacrylic adhesive liquid is applied to the rear face to prevent engaging elements from being pulled out, then the engaging elements are fixed more securely, but the hook-and-loop fastener becomes rigid and engagement performance is deteriorated
Solution Approach 1:
The patent extracts and eliminates the adhesive liquid coating from the rear face. Instead of using polyurethane or polyacrylic adhesives that rigidify the structure, it relies on the integrated weaving structure and heat-fusible yarn to provide fixation, thereby maintaining engagement performance and 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
The solution effectively prevents engaging elements from being pulled out during repeated use, eliminates waving in the up-and-down direction, and allows for the production of wide, flat hook-and-loop fasteners with consistent engaging force, even without a back coating resin layer.
Implementation Method 1
heat-shrinking the heat-fusible yarns to tighten the engaging elements
Implementation Method 2
heat-fusible core-sheath type multifilament yarns
Data Source
AI summary
A flame-retardant hook-and-loop fastener including: a base fabric woven from a warp yarn formed of a polyphenylene sulfide-based multifilament yarn, a weft yarn formed of a polyphenylene sulfide-based multifilament yarn and a multifilament yarn formed of a heat-fusible filament, and a yarn for an engaging element formed of at least one selected from the group consisting of a polyphenylene sulfide-based multifilament yarn and monofilament yarn; and the engaging element formed of the yarn for the engaging element and being present in a front face of the base fabric, in which a thickness of the warp yarn in a base fabric thickness direction at a position at which the warp yarn, which alternately runs over and under the weft yarn with the weft yarn interposed therebetween, subducts most toward a rear face side is 0.94 times or less of a thickness of the warp yarn in the base fabric thickness direction at a position at which the warp yarn floats most toward a front face side.