Adhesive Sheet Layers for Pneumatic Tire Joining
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Solution Overview
Problem
In the manufacturing of pneumatic tires, there is a challenge with insufficient joining between the base layer and cap layer, leading to air retention issues, which results in defective tire covers and increased rolling resistance, particularly affecting tires designed for low fuel consumption.
Innovation Solution
The implementation of adhesive sheet layers between the base and cap layers, and between the tread and carcass, with specific dimensions and adhesive properties to enhance joining and reduce air retention, utilizing a rubber composition with a tackifier and optimized thickness and width to improve adhesiveness and reduce rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a cap layer with low adhesiveness index is used to reduce rolling resistance, then fuel consumption performance is improved, but joining between the cap layer and base layer becomes poor
Solution Approach 1:
An adhesive sheet layer is introduced as an intermediary component between the cap layer and base layer. This adhesive sheet has high adhesiveness and acts as a mediator to ensure reliable joining between the cap layer (which has low adhesiveness for reducing rolling resistance) and the base layer, thus resolving the contradiction between fuel efficiency and joining quality
Solution Approach 2:
The tire structure uses a composite material approach by combining the cap layer (for low rolling resistance), base layer (for structural support), and adhesive sheet layer (for bonding). This composite structure allows each layer to perform its specific function while the adhesive sheet ensures intimate contact between layers, preventing air entrapment and ensuring reliable joining despite the cap layer's low adhesiveness
2Ease of manufacture
If the strip-wind method is used to form the base layer and cap layer, then manufacturing is simplified, but air may remain between windings causing defective products
Solution Approach 1:
The adhesive sheet layer serves as a mediator that facilitates intimate contact between the base layer and cap layer during the strip-wind manufacturing process. Its high adhesiveness ensures that the windings join properly without trapping air, thus maintaining manufacturing precision while using the simplified strip-wind method
Solution Approach 2:
The adhesive sheet layer changes the adhesion parameter at the interface between layers. By introducing a material with specifically high adhesiveness, the joining precision is improved without changing the manufacturing process, allowing air-free bonding during the strip-wind operation
3Ease of manufacture
If end portions of the tread are layered over the carcass without sufficient joining, then manufacturing is easier, but air remains between end portions and carcass causing defects
Solution Approach 1:
The adhesive sheet layer extends to the end portions of the tread and acts as a mediator between the tread end portions and the carcass. This ensures intimate contact and proper joining at the critical end regions, preventing air entrapment and ensuring product quality while maintaining ease of manufacture
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 solution ensures firm joining of the tire components, reducing air retention and enhancing the tire's adhesiveness, resulting in lower fuel consumption and improved durability, while maintaining a lightweight and cost-effective design.
Implementation Method 1
a pair of adhesive sheet layers disposed such that a portion of each adhesive sheet layer is interposed between the base layer and the cap layer
Data Source
AI summary
[Object] A pneumatic tire 2 which is excellent in durability is provided.[Solution] The tire 2 includes adhesive sheet layers 28. Each adhesive sheet layer 28 includes an interposed portion 58 and a protruding portion 60. The interposed portion 58 is interposed between a base layer 32 and a cap layer 34 of a tread 4. The protruding portion 60 is layered over a carcass 12. The adhesive sheet layers 28 are obtained by a rubber composition being crosslinked. The rubber composition contains a tackifier. A width W1 of the interposed portion 58 is preferably greater than or equal to 5 mm, and preferably not greater than 20 mm. A width W2 of the protruding portion 60 is preferably greater than or equal to 10 mm, and preferably not greater than 20 mm. A thickness of each adhesive sheet layer 28 is preferably greater than or equal to 0.5 mm, and preferably not greater than 2.0 mm. A ratio of an adhesive strength of each adhesive sheet layer 28 to an adhesive strength of the cap layer 34 is preferably greater than or equal to 1.30.