PET Woven Hook-and-Loop Fastener With Low-Melting Binder Layer
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Solution Overview
Problem
Conventional PET-based woven fabric hook-and-loop fasteners become stiff and unsuitable for applications requiring a soft texture due to the use of heat-fusible yarns, and they cannot be recycled without being detached from PET-based textile products.
Innovation Solution
A PET-based woven fabric hook-and-loop fastener with a binder layer made of a polyethylene terephthalate resin copolymerized with isophthalic acid, which is integrated on the back surface and bonds engaging elements, while avoiding bonding on the front surface, maintaining flexibility and allowing recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat-fusible yarns are used to bond engaging elements in PET-based woven fabric hook-and-loop fasteners, then engagement force is improved, but the fabric becomes stiff and loses soft texture
Solution Approach 1:
The patent applies different properties to different regions: the binder yarn has low melting point (160-210°C) for effective bonding at the back surface, while the warp and weft yarns have high melting point (250-265°C) to maintain soft texture and flexibility on the front surface. This local differentiation resolves the contradiction between bonding strength and fabric softness.
Solution Approach 2:
The patent changes the melting point parameter of different yarns to achieve different functions. The binder yarn is specifically designed with melting point of 160-210°C for bonding, while structural yarns maintain 250-265°C for texture preservation. This parameter differentiation allows simultaneous achievement of strong engagement and soft texture.
2Adaptability or versatility
If conventional PET-based hook-and-loop fasteners are integrated with textile products, then recycling is enabled, but the fastener cannot be detached for separate processing
Solution Approach 1:
The patent uses melting point parameter differentiation to enable selective detachment. The binder yarn's low melting point (160-210°C) allows the fastener to be detached from textile products by controlled heating during recycling, separating it from the high melting point textile fibers. This resolves the contradiction between integrated recycling and processing ease.
3Strength
If polyurethane-based or polyacrylic-based resin is used for back coating to fix engaging elements, then pull-out resistance is improved, but compatibility with PET recycling systems is lost
Solution Approach 1:
The patent uses binder yarn made of PET-based resin with melting point of 160-210°C, which is homogeneous with PET textile products. This allows the entire assembly (textile product + fastener) to be processed together in PET recycling systems, resolving the contradiction between pull-out resistance and recycling compatibility.
Solution Approach 2:
The patent creates a composite structure where the binder yarn is formed by copolymerizing terephthalic acid with isophthalic acid in specific ratios to achieve the desired melting point range. This composite material approach maintains both the bonding function (pull-out resistance) and recycling compatibility.
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 fastener maintains a soft texture and can be recycled with PET-based textile products without detachment, with enhanced engagement force and color compatibility during dyeing.
Implementation Method 1
a binder layer made of a polyethylene terephthalate-based resin copolymerized with isophthalic acid and having a melting point of 160 to 210°C is provided on the second surface of the base fabric, and the yarn for engaging elements is directly bonded and fixed by the resin of the binder layer
Data Source
Figure 1~2
Figure 3
AI summary
Provided is a hook-and-loop fastener woven from polyethylene terephthalate-based yarns. A resin layer (6) made of a polyethylene terephthalate-based resin copolymerized with isophthalic acid and having a melting point of 160 to 210°C is directly stacked on a second surface of a base fabric (5) that is a woven fabric obtained using yarns made of a polyethylene terephthalate-based resin as a warp yarn (2), a weft yarn (3), and a yarn (3) for engaging elements.