Pneumatic Tire Release Coating for Air Retention and Rim Stability
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Solution Overview
Problem
Existing pneumatic tire manufacturing methods using bladders with release agents face challenges in achieving adequate air retention and puncture sealing without causing bad rim shifting, as excessive release agent application can lead to compromised sealing and rim shifting issues.
Innovation Solution
A pneumatic tire is vulcanized using a bladder with a coating layer formed by a release agent, where the release agent has a thickness of 0.1 μm to 100 μm and silicon content of 0.1 wt.% to 10.0 wt.% on the inner surface, preventing air permeation and ensuring effective sealing for puncture repair without excessive adherence to the bead portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a release agent is applied to the inner surface of the green tire to prevent sticking between the green tire and the bladder, then sticking is prevented, but air retention is insufficient when the amount is too small
Solution Approach 1:
The patent applies a release agent with specific parameter ranges: thickness of 0.1 μm to 10 μm and silicon content of 0.1 wt% to 10.0 wt%. By precisely controlling these parameters, the release agent prevents sticking during vulcanization while maintaining sufficient air retention performance, resolving the contradiction between ease of manufacture and reliability.
2Ease of manufacture
If a large amount of release agent is applied to the tire inner surface, then sticking prevention is improved, but sealing for puncture repair is compromised
Solution Approach 1:
The patent specifies precise parameter ranges for the release agent: thickness of 0.1 μm to 10 μm and silicon content of 0.1 wt% to 10.0 wt%. These controlled parameters ensure adequate sticking prevention during vulcanization while maintaining effective sealing performance for puncture repair, avoiding the harm of excessive release agent application.
3Ease of manufacture
If a powdered release agent is applied to the tire inner surface, then sticking prevention is achieved, but the release agent scatters to the bead portion causing bad rim shifting
Solution Approach 1:
The patent controls the release agent application to achieve a thickness of 0.1 μm to 10 μm, preventing excessive scattering to the bead portion. This parameter control eliminates bad rim shifting while maintaining sticking prevention functionality.
Solution Approach 2:
The release agent is selectively applied to the tread portion inner surface with controlled thickness, creating a local quality distribution that prevents sticking where needed while avoiding harmful accumulation at the bead portion, thus preventing rim shifting.
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 approach improves air retention and puncture repair sealing while preventing bad rim shifting during travel by maintaining a controlled amount of release agent, ensuring both air retention and sealing are achieved without rim shifting issues.
Implementation Method 1
the release agent does not excessively adhere to the vicinity of the bead portion, and thus will not result in bad rim shifting. As a result, the air retention and the sealing for puncture repair can both be achieved
Data Source
AI summary
A pneumatic tire is vulcanized by using a bladder provided with a coating layer formed by a release agent, and the release agent has a thickness, detected by an electron microscope, of 0.1 μm to 100 μm on an inner surface of a tread portion 1.