Tire Sidewall Barrier Layer for Colored Rubber Discoloration
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Solution Overview
Problem
Pneumatic tires with exposed different color rubber layers are prone to discoloration due to migration of rubber compounding agents from the surrounding rubber, especially in thinner sidewall portions, which affects their appearance.
Innovation Solution
Incorporating a barrier rubber layer between the different color rubber layer and the carcass, which includes specific rubber compounding to suppress the migration of rubber compounding agents, thereby preventing discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a different color rubber layer is exposed in the sidewall portions to improve appearance, then the aesthetic quality is improved, but the rubber compounding agents migrate from the surrounding rubber to the different color rubber layer causing discoloration
Solution Approach 1:
A barrier rubber layer is introduced between the carcass (containing rubber compounding agents) and the different color rubber layer. This intermediary layer prevents the migration of rubber compounding agents to the different color rubber layer, thereby preventing discoloration while allowing the different color layer to remain exposed for aesthetic purposes.
Solution Approach 2:
The sidewall rubber is divided into multiple functional layers: the different color rubber layer for aesthetic purposes and a separate barrier rubber layer for protection. This segmentation allows each layer to perform its specific function independently - the different color layer provides appearance quality while the barrier layer prevents harmful migration.
2Weight of moving object
If the sidewall portions are made thinner to reduce weight and improve performance, then the weight and profile are improved, but the migration of rubber compounding agents to the different color rubber layer is accelerated causing discoloration
Solution Approach 1:
The barrier rubber layer serves as a protective intermediary that becomes increasingly important as sidewall thickness is reduced. Even in thinner sidewalls, this barrier layer effectively blocks the migration path of rubber compounding agents, preventing discoloration despite the reduced distance for migration.
Solution Approach 2:
The barrier rubber layer is specifically positioned at the critical interface between the carcass and the different color rubber layer. This localized quality enhancement provides targeted protection exactly where the migration issue occurs, without requiring the entire sidewall to be thicker.
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 suppresses discoloration of the different color rubber layer, maintaining the tire's appearance and durability by inhibiting the migration of rubber compounding agents.
Implementation Method 1
The barrier rubber layer may include a first portion having a rubber compounding to suppress migration of rubber compounding agents on a carcass side to the different color rubber layer
Data Source
AI summary
A pneumatic tire can include a tread portion, a pair of sidewall portions, bead portions, and a carcass. At least one sidewall portion can include a first sidewall rubber arranged outside the carcass in a tire axial direction. The first sidewall rubber can include a different color rubber layer and a barrier rubber layer. The different color rubber layer can have a color different from a basic color of an outer surface of the at least one sidewall portion. At least a part of the different color rubber layer can be exposed in the outer surface of the at least one sidewall portion. The barrier rubber layer can be arranged between the different color rubber layer and the carcass. The barrier rubber layer can include a first portion having a rubber compounding to suppress migration of rubber compounding agents on the carcass side to the different color rubber layer.