Tyre Reinforcing Cords Using Recycled-Virgin Texturized Yarns
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Solution Overview
Problem
High-performance tires for sports automobiles require reinforcing cords with mechanical characteristics similar to those made from fossil plastic materials, but using recycled plastic materials often fall short in tenacity and breaking load, and excessive twisting compromises fatigue resistance.
Innovation Solution
Texturized yarns are created by mixing recycled plastic filaments with non-recycled plastic filaments, allowing for a more homogeneous distribution and improved mechanical properties without the need for solid state polymerization or excessive twisting, thereby achieving comparable tenacity, breaking load, and fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If recycled plastic filaments are used to make reinforcing cords, then environmental sustainability is improved, but tenacity and breaking load deteriorate
Solution Approach 1:
The patent combines recycled plastic filaments with virgin plastic filaments to create a composite yarn structure. This allows the reinforcing cord to benefit from the environmental advantages of recycled materials while maintaining the mechanical strength properties of virgin materials, thus resolving the contradiction between sustainability and strength.
Solution Approach 2:
The patent applies different material qualities to different portions of the yarn structure. Recycled filaments are used in specific regions where they provide adequate performance, while virgin filaments are used in regions requiring higher strength, optimizing both environmental sustainability and mechanical properties locally.
2Strength
If excessive twisting is applied to recycled plastic yarns, then mechanical characteristics are improved, but fatigue resistance deteriorates
Solution Approach 1:
The patent optimizes the twisting parameters by applying only moderate twisting (e.g., 200-400 twists per meter) rather than excessive twisting. This parameter change achieves the necessary mechanical characteristics while preserving the fatigue resistance of the recycled plastic yarns.
Solution Approach 2:
The composite structure of recycled and virgin filaments provides enhanced fatigue resistance even with moderate twisting, as the virgin filaments compensate for the reduced twisting while maintaining overall mechanical strength.
3Strength
If solid state polymerization is used to improve recycled plastic properties, then tenacity is improved, but process complexity increases
Solution Approach 1:
The patent changes the material composition ratio rather than applying solid state polymerization. By adjusting the proportion of recycled to virgin filaments in the composite yarn, the desired tenacity is achieved through a simpler mixing process rather than complex thermal treatment.
Solution Approach 2:
The patent extracts the need for solid state polymerization by using virgin plastic filaments that inherently possess the required mechanical properties, eliminating the complex polymerization process while maintaining tenacity through material selection.
Data Source
AI summary
A tyre for vehicle wheels comprises at least one structural component including a plurality of textile reinforcing cords (10′), at least some of which comprise at least two yarns (20a, 20b) twisted together. At least one of said yarns (20a, 20b) is a texturized yarn (210) comprising a plurality of first filaments (201a) made of a recycled plastic material mixed with a plurality of second filaments (202a) made of a non-recycled plastic material.