Carpet Manufacturing Using Thermal Bonding to Replace Latex Adhesive
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Solution Overview
Problem
Existing carpet products made from polyester yarns lack the durability required for high-end commercial use, despite efforts to improve their durability through high twist levels and adhesive bonding.
Innovation Solution
A method for manufacturing a carpet product using polyester yarns with a weight of at least 2500 Dtex and a twist level of at least 100 tpm, where the yarns are stitched through a primary backing and the locked ends are bonded to the backing by melting and solidifying the polyester, rather than using a latex adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If nylon is used for carpet yarns, then wear resistance is improved, but cost increases and recyclability decreases
Solution Approach 1:
The patent changes the material parameter from nylon to polyester yarns, and compensates for polyester's lower inherent wear resistance by implementing thermal bonding at the back surface. This melting and bonding process creates strong fiber-to-backing adhesion, enabling polyester carpets to achieve commercial-grade durability without the high cost and poor recyclability of nylon.
Solution Approach 2:
The patent replaces chemical bonding (latex adhesive) with thermal bonding (melting polyester). This substitution eliminates the need for additional chemical agents, reduces manufacturing complexity, and improves recyclability while maintaining or enhancing wear resistance through direct thermal fusion of the polyester fibers to the backing.
2Strength
If latex or other adhesive is used to lock yarns to the primary backing, then bonding strength is improved, but manufacturing complexity and environmental impact increase
Solution Approach 1:
The patent extracts and eliminates the latex adhesive component from the carpet construction. By using thermal bonding to melt and fuse the polyester yarns directly to the primary backing, the process removes the need for separate adhesive application, drying, and curing steps, thereby simplifying manufacturing while maintaining bonding strength.
Solution Approach 2:
The patent substitutes chemical bonding (latex adhesive application) with thermal bonding (heat-induced melting). This replacement eliminates complex adhesive delivery systems, drying chambers, and quality control for adhesive application, reducing manufacturing complexity while achieving equivalent or superior bonding through direct thermal fusion of polyester fibers.
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 achieves a carpet product with improved durability, meeting the requirements for high-end commercial use, including classes 31, 32, and 33 according to the European norm EN 1307:2014+A3:2019, while also being easy to recycle.
Implementation Method 1
processing the intermediate product by feeding this product along a body having a heated surface, the back surface being contacted with the said heated surface, to melt at least a part of the polyester of the locked end of the one or more yarns
Implementation Method 2
cooling the molten part of the polyester to solidify this molten part of the polyester, thereby connecting the locked end of the one or more yarns to the first sheet
Data Source
AI summary
A method for manufacturing carpet product includes providing a first sheet having a front surface and a back surface, providing polyester yarns having a weight of at least 2500 Dtex and a twist level of at least 100 tpm, forming a pile on the front surface of first sheet by stitching the yarns through the first sheet, the yarns having a free end that forms the said pile and a locked end present at the back surface of the first sheet, thereby forming an intermediate product, processing the intermediate product by feeding it along a body having a heated surface, the back surface being contacted with the said heated surface, and then cooling the molten part of the polyester to solidify this molten part of the polyester.