Metallic Cord Treatment for Tyre Adhesion
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Solution Overview
Problem
The existing methods for incorporating metallic reinforcing plies in tires often result in rubberless gaps between the wires, leading to adhesion issues and corrosion, which compromise the tire's performance and lifespan.
Innovation Solution
A method involving the treatment of metallic cords with a diene elastomeric polymer, specifically polybutadiene with a viscosity between 3 and 10 Pa·s, containing functional groups like -OH, before incorporation into the tire's skim layer, ensuring complete penetration and improved adhesion and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic cords are used as reinforcing plies in tyres, then strength and load support are improved, but rubber penetration into cord gaps is insufficient leading to adhesion problems and corrosion
Solution Approach 1:
The metallic cords are pre-treated with a diene elastomeric polymer solution before being incorporated into the tyre skim layer. This preliminary coating action ensures that the cords are already prepared to receive and bond with the rubber, eliminating the adhesion problems that would otherwise occur due to insufficient rubber penetration into the cord gaps.
Solution Approach 2:
A diene elastomeric polymer acts as an intermediary substance between the metallic cord and the rubber skim layer. This polymer coating on the cord surface facilitates better rubber penetration and bonding, serving as a mediator that improves adhesion while allowing the rubber to effectively bond to the metallic structure.
2Reliability
If metallic cords with special shapes are used to improve performance, then adhesion is enhanced, but rubberless gaps still persist compromising cord protection
Solution Approach 1:
The metallic cords are pre-coated with diene elastomeric polymer before incorporation into the tyre structure. This preliminary action ensures that even cords with special shapes that create gaps are pre-prepared to receive rubber, and the polymer coating facilitates complete rubber penetration into all gaps, eliminating corrosion risks.
Solution Approach 2:
The invention changes the physical-chemical parameters of the cord surface by coating it with a specific polymer solution. This parameter change (surface coating with controlled viscosity and composition) enables the rubber to penetrate into gaps that would otherwise remain rubberless, even in specially shaped cords designed for improved adhesion.
3Reliability
If rubber skim layer is applied to metallic cords, then adhesion is achieved, but rubber cannot penetrate gaps between wires creating discontinuities
Solution Approach 1:
The metallic cords are pre-treated with a diene elastomeric polymer solution before the rubber skim layer is applied. This preliminary action modifies the cord surface properties, enabling the subsequent rubber layer to penetrate completely into the gaps between wires, achieving both adhesion and complete penetration without discontinuities.
Solution Approach 2:
The invention changes the surface parameters of the metallic cord by applying a polymer coating with specific viscosity characteristics (3-100 Pa·s). This parameter change enables the rubber to effectively penetrate into the cord gaps during the skim layer formation process, achieving complete coverage and eliminating manufacturing precision issues related to incomplete penetration.
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 treatment significantly enhances adhesion and reduces corrosion, as demonstrated by improved test results, with optimal viscosity range ensuring effective rubber penetration and coating of the cords.
Implementation Method 1
the metallic cords are wetted with a diene elastomeric polymer with a viscosity of between 3 and 100 Pa·s at room temperature
Implementation Method 2
points of discontinuity are thus created that may compromise adhesion and the cord itself
Data Source
AI summary
A method for making rubber portions comprising tyre metallic reinforcing plies. This method comprises an incorporation step wherein metallic cords which constitute the plies are arranged between two skim layers and a treatment step for the metallic cords, that precedes the incorporation step and wherein the metallic cords are wetted with a diene elastomeric polymer with a viscosity of between 3 and 10 Pa·s at room temperature.