Pneumatic Tire Release Coating for Air Retention and Puncture Sealing
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Solution Overview
Problem
Existing pneumatic tire vulcanization methods using bladders face issues with air retention and puncture repair sealing due to improper application of release agents, leading to potential rim shifting during travel.
Innovation Solution
A pneumatic tire is vulcanized using a bladder with a controlled coating layer of release agent, with a thickness of 0.1 μm to 100 μm and silicon content of 0.1 wt. % to 10.0 wt. %, ensuring air retention and puncture repair without rim shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a powdered release agent is applied to the tire inner surface, then sticking between green tire and bladder is prevented, but the release agent scatters to the bead portion causing bad rim shifting
Solution Approach 1:
The invention changes the physical state parameter of the release agent from solid powder to liquid form, and controls the film thickness to 1 μm to 10 μm. This prevents scattering to the bead portion during vulcanization while maintaining effective release properties, thereby eliminating rim shifting issues.
Solution Approach 2:
The liquid release agent with controlled film thickness forms a thin, uniform coating that is consumed during vulcanization without leaving residual particles that could cause rim shifting. The controlled application ensures the release agent performs its function temporarily during manufacturing and then disappears without harmful effects.
2Reliability
If the release agent film thickness is increased, then air retention improves, but the release agent repels puncture repair liquid
Solution Approach 1:
The invention optimizes the film thickness parameter to a specific range of 1 μm to 10 μm. This controlled thickness provides sufficient air retention by preventing air permeation through the tire inner surface, while simultaneously being thin enough to allow puncture repair liquid to wet and seal effectively, resolving the contradiction between air retention and puncture repair ease.
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 effectively improves air retention and puncture repair while preventing rim shifting by controlling the release agent's application, maintaining optimal tire performance.
Implementation Method 1
the release agent in such a small amount attached to the tire inner surface in this manner inhibits the permeation of air from the tire inner surface, so that air retention can be improved
Implementation Method 2
sealing for puncture repair can be improved
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.