Phase-Change Rivet Disassembly for Textile Recycling
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Solution Overview
Problem
The textile industry faces challenges in recycling and reusing textile products containing rivets due to the energy-intensive and complex shredding process, which reduces the quality and purity of recycled materials.
Innovation Solution
A method for disassembling rivets on textile articles using phase change materials, where at least one rivet element comprises a first material with a melting or glass transition temperature between 50.0 and 300.0°C, and a second material with a temperature at least 20.0°C higher, allowing for easy disconnection when heated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If textile products containing rivets are shredded to remove rivets, then rivets can be separated from textile, but the quality and purity of recycled materials are reduced and the process becomes energy intensive
Solution Approach 1:
The rivet is divided into two separate elements: a rivet body element and a rivet head element. These elements are connected through a material bridge that can be selectively removed, allowing the rivet to be disassembled into separate components without shredding the textile product.
Solution Approach 2:
The connection between rivet elements utilizes materials with specific melting or glass transition temperatures (first material: 50-300°C, second material: at least 20°C higher). By changing the temperature parameter to exceed the melting point of the first material but remain below the second material's transition point, the connection is selectively broken to enable disassembly.
2Strength
If traditional rivets are used in textile products, then fastening function is achieved, but the products become difficult to recycle and require complex energy-intensive processes
Solution Approach 1:
The rivet is divided into two separate elements: a rivet body element and a rivet head element. These elements are connected through a material bridge that can be selectively removed, allowing the rivet to be disassembled into separate components without shredding the textile product.
Solution Approach 2:
The connection between rivet elements utilizes materials with specific melting or glass transition temperatures. By heating to a temperature above the melting point of the first material but below the second material's transition point, the connection material undergoes phase transition from solid to liquid, enabling selective disconnection of the rivet elements.
3Ease of operation
If rivets are removed through traditional mechanical means, then separation is achieved, but the process reduces the value and quality of recycled textile materials
Solution Approach 1:
The connection between rivet elements utilizes materials with specific melting or glass transition temperatures (first material: 50-300°C, second material: at least 20°C higher). By changing the temperature parameter to exceed the melting point of the first material but remain below the second material's transition point, the connection is selectively broken to enable disassembly.
Solution Approach 2:
The permanent mechanical connection of traditional rivets is replaced with a thermally controllable connection using phase-change materials. Instead of mechanical force for removal, thermal energy is used to trigger phase transition and selective dissolution of the connection material, enabling gentle separation that preserves textile quality.
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 eliminates the need for shredding, preserves the mechanical properties and purity of recycled materials, and enables efficient semi-automatic or fully automatic disassembly, resulting in high-quality recycled products and significant financial savings.
Implementation Method 1
at least one rivet element comprises a first and a second material, wherein said first material has a melting and/or glass transition temperature of between 50.0 and 300.0° C.
Implementation Method 2
said first material has a melting and/or glass transition temperature of between 50.0 and 300.0° C.
Implementation Method 3
said second material has a melting and/or glass transition temperature which is at least 20.0° C. higher than the melting and/or glass transition temperature of said first material.
Data Source
AI summary
Methods for disassembling rivets on textile articles. The rivets include at least two separate rivet elements. One of the rivet elements includes a first and a second material. The first material has a melting and/or glass transition temperature of between 50.0 and 300.0° C. and second material has a melting and/or glass transition temperature which is at least 20.0° C. greater than the melting and/or glass transition temperature of said first material. The rivet element that includes the first material and the second material is heated to a temperature between the melting and/or glass transition temperature of the first material and the second material. The first element and the second element are disassembled.