Triple Twist Textile Cord for Tire Reinforcement
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Solution Overview
Problem
Existing textile cords used for reinforcing tires face a trade-off between fatigue resistance and breaking strength, where higher twist for improved fatigue resistance leads to reduced breaking strength, and designers seek to enhance mechanical properties like breaking strength and tenacity for a given material and twist.
Innovation Solution
A textile cord with at least triple twist (T1, T2, T3) construction, where each strand is composed of pre-strands twisted in a specific direction, with at least half of the yarns having an initial extension modulus greater than 800 cN/tex, and the sum of T1+T2 included between 0.8 and 1.2 times T3, to achieve improved breaking strength and tenacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher twist is applied to improve fatigue resistance, then fatigue resistance is improved, but breaking strength decreases
Solution Approach 1:
The textile cord is divided into multiple strands (N strands, N>1), each strand into multiple pre-strands (M pre-strands, M>1), and each pre-strand into multiple yarns. This segmentation allows the twist to be distributed across multiple levels (T1, T2, T3), so that the overall structure achieves fatigue resistance through the combined effect of multiple twists without requiring excessive twist in a single layer, thereby preserving breaking strength.
Solution Approach 2:
The invention introduces a third twist dimension (T3) in addition to the traditional two twists (T1, T2). The final twist T3 is applied to assemble multiple strands, creating a three-dimensional twist architecture. This additional dimension allows the structure to achieve fatigue resistance through the cumulative effect of three twists rather than relying on high twist in a single plane, thus maintaining breaking strength while improving fatigue performance.
2Reliability
If greater torsional force is applied to increase fatigue resistance, then fatigue resistance is improved, but tensile strength decreases
Solution Approach 1:
The invention changes the twist parameters by introducing a third twist T3 and establishing specific relationships between T1, T2, and T3 (where T1+T2 is between 0.8 and 1.2 times T3). This parameter optimization allows the structure to achieve adequate fatigue resistance through the combined twist effect without applying excessive torsional force to any single layer, thereby preserving tensile strength.
3Ease of manufacture
If traditional double twist construction is used, then manufacturing simplicity is maintained, but mechanical properties (breaking strength and toughness) are limited
Solution Approach 1:
The textile cord is divided into multiple strands (N strands, N>1), each strand into multiple pre-strands (M pre-strands, M>1), and each pre-strand into multiple yarns. This segmentation allows the twist to be distributed across multiple levels (T1, T2, T3), so that the overall structure achieves fatigue resistance through the combined effect of multiple twists without requiring excessive twist in a single layer, thereby preserving breaking strength.
Solution Approach 2:
The invention introduces a third twist dimension (T3) in addition to the traditional two twists (T1, T2). The final twist T3 is applied to assemble multiple strands, creating a three-dimensional twist architecture. This additional dimension allows the structure to achieve fatigue resistance through the cumulative effect of three twists rather than relying on high twist in a single plane, thus maintaining breaking strength while improving fatigue performance.
Data Source
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AI summary
The invention relates to a textile cord (50) having an at least triple twist (T1, T2, T3), comprising at least N strands (20a, 20b, 20c, 20d), where N is greater than 1, which are twisted together to a final twist T3 in a final direction D2, each strand being made up of M pre-strands (10a, 10b, 10c), where M is greater than 1, which pre-strands are in turn twisted to an intermediate twist T2 (T2a, T2b, T2c, T2d) in an intermediate direction D1 which is opposite to D2, with every pre-strand consisting of a spun fibre (5) that has been twisted on itself to an initial twist T1 (T1a, T1b, T1c) in the direction D1, wherein at least half the N times M spun fibres have an initial modulus of elasticity Mi greater than 800 cN/tex. This textile cord can advantageously be used as reinforcement in vehicle pneumatic tires, especially in the belt or the carcass ply of said pneumatic tires.