Vehicle Tyre Elastomer Composition for Adhesion Control
Solution Overview
Problem
The storage of semi-finished elastomeric materials in strip form on reels is hindered by their stickiness, leading to adhesion issues that make unwinding difficult, affecting the production of vehicle tires.
Innovation Solution
A crosslinkable elastomer composition comprising cis-1,4-polyisoprene natural rubber, a butadiene copolymer, and either trans-1,4-polyisoprene or trans-1,4-polybutadiene is used, which reduces mutual adhesiveness and enhances green strength, allowing for easier unwinding and improved tire performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If green elastomeric polymer is stored in wound form on reels, then storage efficiency is improved, but adhesion between turns occurs making unwinding difficult
Solution Approach 1:
A release agent is applied between the turns of the semi-finished material during winding to prevent adhesion. This intermediary substance allows the material to be stored in wound form while enabling easy unwinding by reducing the adhesive forces between contacting surfaces.
Solution Approach 2:
The surface properties of the green elastomeric polymer are modified by applying a release agent, changing the adhesive parameters of the material surface. This allows the material to maintain its inherent stickiness for bonding purposes while preventing unwanted adhesion during storage on reels.
2Ease of operation
If adhesion between turns is reduced for easier unwinding, then ease of operation is improved, but green strength of the semi-finished material decreases
Solution Approach 1:
The release agent acts as a temporary intermediary that prevents adhesion during storage but does not compromise the green strength of the material itself. The agent is applied in a controlled manner to interfaces between turns rather than throughout the material structure, preserving the material's inherent bonding capabilities.
Solution Approach 2:
The release agent is applied locally at the interfaces between turns of the wound material rather than uniformly throughout the entire semi-finished material. This localized application reduces adhesion where needed while preserving the green strength and bonding properties of the material in its functional areas.
3Ease of operation
If trans-1,4-polyisoprene is used to reduce adhesiveness during storage, then ease of operation is improved, but adhesion to reinforcing cords after vulcanization may be compromised
Solution Approach 1:
The release agent serves as a temporary intermediary during storage that does not interfere with the permanent bonding interface between the elastomeric material and reinforcing cords. The agent is positioned and formulated to affect only the turn-to-turn interfaces during storage, leaving the cord-to-material adhesion properties intact after vulcanization.
Solution Approach 2:
The release agent is applied in advance during the winding process to prevent adhesion issues before they occur. This preliminary action ensures easy unwinding during storage and manufacturing operations, while the actual bonding to reinforcing cords occurs later during vulcanization when the release agent no longer interferes with the bonding process.
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 composition exhibits reduced adhesiveness during storage and improved adhesion post-vulcanization, resulting in enhanced tire strength and fatigue resistance, particularly at high speeds.
Implementation Method 1
a treatment of molding and vulcanizing is generally carried out for the purpose of structural stabilization of the tyre by crosslinking the elastomer mixtures
Implementation Method 2
The applicant found that the use of a crosslinkable elastomer composition comprising trans-1,4-polyisoprene makes it possible to solve the aforementioned problem... displayed little adhesiveness when stored in the form of continuous strip on reels
Data Source
Figure 1
AI summary
The present invention relates to a tyre for vehicle wheels comprising at least one element comprising a crosslinked elastomeric material obtained by crosslinking a crosslinkable elastomer composition comprising a polymer base consisting of: (a) cis-1,4-polyisoprene natural rubber; (b) a butadiene (co)polymer; (c) at least one diene polymer selected from the group consisting of trans-1,4-polyisoprene and trans-1,4- polybutadiene.