PET Belt-Reinforced Tire Tread Composition for Low Noise Stability
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Solution Overview
Problem
Pneumatic tires using polyethylene terephthalate (PET) fiber cords for belt cover layers face challenges in achieving high-speed steering stability, low rolling resistance, and high-speed durability while reducing road noise.
Innovation Solution
The use of PET fiber cords with an elongation ratio under a load of 2.0 cN/dtex at 100° C. ranging from 2.0% to 4.0% for the belt cover layer, combined with a specific under tread rubber composition and appropriate filler blending, enhances the tire's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If PET fiber cord is used for belt cover layer, then road noise is reduced and cost is decreased, but high-speed steering stability is degraded
Solution Approach 1:
The patent controls the elongation ratio of PET fiber cord under specific load conditions (2.0 cN/dtex at 100°C) within the range of 2.0% to 4.0%. This parameter control allows the belt cover layer to provide sufficient rigidity for high-speed steering stability while maintaining the noise reduction benefits of PET fiber cords.
2Ease of manufacture
If PET fiber cord is used for belt cover layer, then cost is reduced, but rolling resistance increases
Solution Approach 1:
The patent specifies controlling the elongation ratio of PET fiber cord within 2.0% to 4.0% under defined test conditions. This optimized parameter range reduces unnecessary deformation and energy loss during tire rolling, thereby lowering rolling resistance while maintaining cost advantages of PET fiber cords.
3Strength
If PET fiber cord is used for belt cover layer, then elasticity is increased, but high-speed durability is reduced
Solution Approach 1:
The patent controls the elongation ratio of PET fiber cord within the specific range of 2.0% to 4.0% under standardized test conditions (2.0 cN/dtex load at 100°C). This parameter optimization balances the high elasticity of PET fiber cords with the need for dimensional stability at high speeds, thereby improving high-speed durability while maintaining the inherent elasticity benefits.
Data Source
AI summary
In a pneumatic tire including a belt reinforcing layer and a tread portion made up of cap tread and under tread layers, a polyethylene terephthalate fiber cord constituting the belt reinforcing layer has an elongation ratio of 2.0-4.0% under a load of 2.0 cN/dtex at 100° C., the under tread layer is made of a rubber composition blending, per 100 parts by mass of rubber component, 35-60 parts by mass of carbon black having a CTAB adsorption specific surface area of less than 70 m2/g and 3-30 parts by mass of silica having the CTAB adsorption specific surface area of less than 180 m2/g and has a hardness at 20° C. from 60-65, a tensile stress at 100% elongation at 100° C. of 2.0-4.0 MPa, and a product of a tensile strength at 100° C. and an elongation at break at 100° C. of 2000 or more.