Polysiloxane Coating for Tyre Vulcanization Chamber Adhesion
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Solution Overview
Problem
The existing methods for producing tires with auxiliary components, such as sound absorbent foams and monitoring devices, face challenges in achieving strong and durable adhesion to the inner surface of the tire without damaging the elastomeric material layer, while also reducing production costs and time, and minimizing the risk of polluting substances in the production cycle.
Innovation Solution
A process involving a multilayer polysiloxane composition treatment for the expandable vulcanization chamber and the inner surface of the tire, where a cross-linkable polysiloxane composition is applied to the chamber and a non-cross-linkable polysiloxane composition is applied to specific portions of the tire's inner surface, facilitating adhesion and reducing the risk of damage during the vulcanization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the expandable chamber is expanded during vulcanisation, then the tyre is moulded and vulcanised effectively, but the chamber surface remains attached to the tyre inner surface causing separation damage and flaws
Solution Approach 1:
A polysiloxane-based lubricant composition is introduced as an intermediary substance between the expandable chamber surface and the tyre inner surface. This lubricant prevents direct attachment and adhesion during expansion and deflation, eliminating surface damage and flaws while maintaining effective moulding and vulcanisation.
Solution Approach 2:
The expandable chamber is preliminarily covered with the polysiloxane-based lubricant composition before the vulcanisation process begins. This preliminary application ensures that the lubricant is already in place to prevent surface attachment and adhesion damage during the subsequent expansion and deflation cycles.
2Adaptability or versatility
If auxiliary components are applied to the tyre inner surface, then functional features are added, but adhesion is insufficient and components detach during rolling
Solution Approach 1:
The tyre inner surface is treated with different properties in different zones: the crown portion is left with high adhesion characteristics to ensure auxiliary component attachment, while the bead zones receive the polysiloxane lubricant treatment to enable chamber separation. This local differentiation allows both component adhesion and chamber deflation to occur successfully.
3Strength
If cleaning operations are performed on the tyre inner surface, then auxiliary component adhesion is improved, but production time increases and surface damage risk increases
Solution Approach 1:
The tyre inner surface is preliminarily treated during the vulcanisation process itself, with the polysiloxane lubricant applied to specific zones before auxiliary components are attached. This preliminary treatment creates the necessary adhesion properties without requiring separate cleaning operations, thus maintaining production efficiency while ensuring proper component attachment.
4Productivity
If the expandable chamber is reused for multiple vulcanisation cycles, then production efficiency is maintained, but oxidative phenomena and damage accumulate at the bead zones
Solution Approach 1:
The expandable chamber is preliminarily covered with the polysiloxane-based lubricant composition before each vulcanisation cycle. This preliminary protection layer prevents oxidative phenomena and damage accumulation at the bead zones during repeated expansion and deflation operations, maintaining chamber durability and production efficiency.
Solution Approach 2:
The polysiloxane lubricant composition serves as a protective cushion applied beforehand to the chamber surface, preventing direct contact between the chamber and tyre materials that cause oxidative damage. This prior cushioning protects the chamber during multiple vulcanisation cycles, extending its usable life.
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 process ensures strong and durable adhesion of auxiliary components, reduces production costs and time, increases the number of vulcanization cycles, and maintains the quality of the tires by minimizing damage to the elastomeric material layer and reducing oxidative phenomena at the bead zones.
Implementation Method 1
covering the external surface of said expandable vulcanisation chamber with a first substantially cross-linkable polysiloxane composition A comprising A1) at least one reactive polysiloxane oil having OH groups, A2) at least one cross-linking agent comprising at least two functional groups capable of reacting with the reactive polysiloxane oil A1)
Implementation Method 2
The expansion of the expandable chamber is obtained by means of introduction of a pressurized hot fluid (gas or steam) within the same, so as to bring said expandable chamber in contact with the inner surface of the tyre and compress the latter against the walls of the moulding cavity, with simultaneous transmission of the heat required for cross-linking.
Implementation Method 3
covering the external surface of said expandable vulcanisation chamber with a first substantially cross-linkable polysiloxane composition A
Data Source
AI summary
A process for producing tyres with auxiliary components for vehicle wheels is described. The process includes i) covering the external surface of an expandable chamber for tyre vulcanisation and moulding apparatuses with a first substantially cross-linkable polysiloxane composition and ii) covering the radially inner surface of the impermeable elastomeric material layer of the green tyre with a second substantially non-cross-linkable polysiloxane composition. An expandable chamber for tyre vulcanisation and moulding apparatuses and, a process for treating the expandable chamber are also described.