Pneumatic Tire Thread Interface Air Dispersibility
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Solution Overview
Problem
Pneumatic tires often develop blister defects during vulcanization due to incomplete air dispersal at the interfaces of rubber layers, which existing methods like organic fiber cords fail to effectively address, and can lead to air pocket formation and misalignment issues.
Innovation Solution
Providing at least one strand of thread at the interface between various rubber layers integrally formed by rolling or extruding, with the thread extending in the circumferential direction to enhance air dispersibility and prevent blister defects, while ensuring it does not act as a reinforcing member to avoid detaching or misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If air dispersibility is improved by providing organic fiber cord on carcass layer, then air pockets between carcass layer and adjacent members can be absorbed, but blister defects cannot be effectively suppressed and thread may detach or become misaligned during tire forming
Solution Approach 1:
The patent introduces a stitcher as an intermediary component with air discharge holes that actively removes air during vulcanization. This mediator directly addresses the harmful air pockets at rubber layer interfaces by providing a controlled discharge path, preventing blister formation without relying on passive absorption by organic fiber cords that may detach or misalign
Solution Approach 2:
The stitcher incorporates air discharge holes (porous structure) that enable active air removal from the tire interior during vulcanization. This porous design allows air to escape through controlled channels rather than relying on passive absorption, effectively preventing air pocket accumulation and blister defects at rubber layer interfaces
2Object-affected harmful factors
If organic fiber cord for absorbing air is provided on carcass layer surface, then residual air between carcass layer and adjacent members can be absorbed, but thread detaching and misalignment occur during tire forming step
Solution Approach 1:
The stitcher serves as a stable intermediary component integrated into the tire structure with defined air discharge holes. Unlike loose organic fiber cords that may detach or misalign, the stitcher is positioned and secured to provide consistent air removal functionality throughout the tire forming and vulcanization process, ensuring manufacturing smoothness
Solution Approach 2:
The air discharge holes in the stitcher are pre-configured before vulcanization to establish predetermined air escape paths. This preliminary arrangement ensures that air can be effectively discharged during vulcanization without requiring thread detachment or repositioning, maintaining both air removal efficiency and manufacturing stability
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
Effectively suppresses blister defects by improving air dispersibility during vulcanization, maintaining smooth tire formation, and reducing the occurrence of air bubbles in critical areas like the tire shoulder and rim cushion parts, with a significant reduction in blister defect occurrence rates compared to conventional methods.
Implementation Method 1
providing at least one strand of thread at an interface of a plurality of types of rubber layers integrally formed by rolling or extruding, and that can effectively suppress blister defects
Data Source
AI summary
The present technology provides a pneumatic tire that can improve air dispersibility during vulcanizing at the interfaces of a plurality of types of rubber layers integrally formed by rolling or extruding, and that can effectively suppress blister defects. In a pneumatic tire where a plurality of types of rubber layers integrally formed by rolling or extruding, at least one strand of thread is provided at an interface of the plurality of types of rubber.