Pneumatic Tire Sidewall Cover Layer Wax-Free Adhesion
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Solution Overview
Problem
Traditional tire sidewall compounds containing waxes and antiozonants hinder proper adhesion of paints or inks, leading to premature disbonding and degradation of designs or wording applied to the tire.
Innovation Solution
A sidewall configuration featuring a wax-free cushion layer and a cover layer with a thermoset material or polymers having an ozone-resistant backbone, both with minimal concentrations of wax and antiozonants, ensuring proper bonding and protection from degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tire sidewall compounds containing waxes and antiozonants are used, then the sidewall provides adequate protection and flexibility, but the adhesion of paints or inks to the sidewall deteriorates
Solution Approach 1:
The sidewall is divided into two distinct layers: a cushion layer containing waxes and antiozonants for protection and flexibility, and a cover layer with minimal wax and antiozonant concentrations for paint/ink adhesion. This segmentation allows each layer to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the sidewall are given different compositions tailored to their specific functions. The cushion layer (inner region) has high wax and antiozonant content for protection, while the cover layer (outer region) has minimal concentrations to enable proper paint/ink bonding.
2Reliability
If traditional tire sidewall compounds containing waxes and antiozonants are used, then the sidewall maintains its protective properties, but the durability of applied designs or wording deteriorates due to premature disbonding
Solution Approach 1:
The sidewall structure is segmented into a cushion layer for protection and a cover layer for durable design application. The cover layer's minimal wax and antiozonant content ensures long-term adhesion of paints or inks, while the cushion layer maintains protective functions.
Solution Approach 2:
The cover layer is prepared in advance with specific material properties (minimal wax and antiozonants) that pre-establish proper bonding conditions for paints or inks, preventing premature disbonding before the tire is even put into service.
3Reliability
If traditional tire sidewall compounds containing waxes and antiozonants are used, then the sidewall provides adequate chemical protection, but the quality of applied paints or inks deteriorates due to discoloration and staining
Solution Approach 1:
The cover layer is formulated with minimal wax and antiozonant concentrations specifically at the surface region where paints or inks are applied. This local quality control prevents discoloration and staining of designs or wording while the cushion layer below maintains overall chemical protection.
Solution Approach 2:
The sidewall is segmented so that the cover layer (surface region) has composition optimized for paint/ink quality, while the cushion layer (inner region) contains full protective additives. This segmentation isolates the protective chemical functions from the surface quality requirements.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A pneumatic tire having a sidewall cover layer for application of a printing ink and/or paint is provided. In one embodiment, the tire comprises: a sidewall portion including a cushion layer and a cover layer, wherein the cover layer is oriented axially outwardly of the cushion layer, wherein the cover layer is bonded to the cushion layer, wherein the cover layer is formed from a material that contains wax in a concentration of less than 0.03 pph, and wherein the cushion layer does not contain a wax.