Pneumatic Tire Inner Liner Protective Layer
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Solution Overview
Problem
Pneumatic tires face issues with weathering resistance, damage resistance, and fatigue resistance, particularly during storage and display, due to the limitations of existing inner liner technologies.
Innovation Solution
A pneumatic tire design featuring a thermoplastic elastomer inner liner with a protective layer, comprising natural rubber, epoxylated diene-based rubber, and halogenated butyl rubber, which enhances bondability and includes a bonding layer for improved splicing and productivity during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thermoplastic elastomer inner liner is used, then the tire structure is simplified and manufacturing is easier, but the weathering resistance, damage resistance and fatigue resistance deteriorate
Solution Approach 1:
The patent applies composite materials by combining a thermoplastic elastomer inner liner with a protective layer made of different rubber materials. The inner liner provides manufacturing advantages while the protective layer compensates for deficiencies in weathering resistance, damage resistance and fatigue resistance. This composite structure allows each layer to contribute its strengths, resolving the contradiction between ease of manufacture and reliability.
2Ease of manufacture
If a thermoplastic elastomer inner liner is used, then the tire structure is simplified and manufacturing is easier, but the damage resistance and fatigue resistance deteriorate
Solution Approach 1:
The protective layer composed of rubber materials with superior mechanical properties is combined with the thermoplastic elastomer inner liner. This composite structure provides the damage resistance and fatigue resistance that the thermoplastic elastomer alone cannot achieve, while maintaining the manufacturing simplicity of the thermoplastic elastomer system.
3Reliability
If a protective layer is added to the inner liner, then the weathering resistance, damage resistance and fatigue resistance improve, but the device complexity increases
Solution Approach 1:
The patent segments the inner liner system into two functional layers: a thermoplastic elastomer inner liner and a protective layer. This segmentation allows each layer to be optimized for its specific function while maintaining overall system simplicity. The protective layer is designed as a distinct component that can be applied separately, reducing the complexity of integrating multiple functions into a single material.
4Reliability
If a protective layer is added to the inner liner, then the weathering resistance, damage resistance and fatigue resistance improve, but the device complexity increases
Solution Approach 1:
By segmenting the protective function into a separate protective layer, the patent achieves improved damage resistance without significantly increasing overall structural complexity. The protective layer is designed as a straightforward addition that works in conjunction with the existing thermoplastic elastomer inner liner, maintaining system simplicity while enhancing performance.
5Device complexity
If conventional inner liner materials are used, then the structure is simple, but the bondability and splicing performance during manufacturing deteriorate
Solution Approach 1:
The protective layer is designed with specific local qualities including rubber materials with good bondability and splicing performance. This local quality enhancement at the protective layer interface improves manufacturing performance without requiring changes to the overall simple structure of the thermoplastic elastomer inner liner system.
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 solution significantly improves weathering resistance, damage resistance, and fatigue resistance of the film liner, while also enhancing the bonding process and productivity in tire manufacturing by using a protective layer with specific rubber compounds and a bonding layer.
Implementation Method 1
by arranging a protective layer on the surface of an inner liner layer of a pneumatic tire using a thermoplastic elastomer, the weathering resistance, damage resistance and fatigue resistance of the film liner at the time of tire storage can be improved
Implementation Method 2
by compounding, to this protective layer, an epoxylated diene-based rubber and a halogenated butyl rubber, the bondability with the film liner layer can be improved
Data Source
Figure 1~3
Figure 4~6
AI summary
A pneumatic tire using, as an inner liner layer, a thermoplastic elastomer comprising a thermoplastic resin matrix, in which a rubber component is dispersed a surface of the inner liner layer is covered with a protective layer, whereby a weathering resistance, damage resistance and fatigue resistance of the film liner of the inner liner layer at the time of tire storage are improved.