Self-Sealing Tire Composition Extrusion Process
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Solution Overview
Problem
Existing self-sealing compositions for tires face challenges in stability over time and effectiveness under extreme temperature conditions, and difficulties in manufacture and application due to high hysteresis losses and fluidity issues, making it hard to achieve airtightness and maintain rolling resistance.
Innovation Solution
A process for applying a rubber-based self-sealing composition on the internal surface of a tire using an extrusion method where the composition is crosslinked in an extrusion die under controlled temperature and speed conditions, allowing for direct deposition on the tire surface in a single step, eliminating intermediate handling phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-sealing compositions based on butyl rubber are used, then airtightness is improved, but hysteresis losses increase and rolling resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by using unsaturated diene elastomers (natural rubber, polybutadiene) instead of butyl rubber, and adjusts the hydrocarbon resin content to less than 100 parts per hundred parts of elastomer. This parameter change reduces hysteresis losses while maintaining self-sealing effectiveness through optimized composition ratios.
Solution Approach 2:
The patent creates a composite self-sealing composition combining unsaturated diene elastomer with specific amounts of hydrocarbon resin and filler. This composite material achieves a balance between airtightness, low hysteresis, and self-sealing properties by integrating multiple materials with complementary characteristics.
2Reliability
If self-sealing compositions with high hydrocarbon resin content are used, then self-sealing effectiveness is improved, but composition stability at high temperature deteriorates
Solution Approach 1:
The patent changes the hydrocarbon resin content parameter to less than 100 parts per hundred parts of elastomer (significantly lower than conventional compositions), and adjusts the elastomer molecular weight and filler content. This parameter optimization maintains self-sealing effectiveness while preventing excessive softening and flow at high temperatures.
3Ease of operation
If self-sealing compositions with high fluidity are used, then ease of application is improved, but dimensional stability under centrifugal forces deteriorates
Solution Approach 1:
The patent changes the viscosity parameters by controlling hydrocarbon resin content (less than 100 phr) and elastomer molecular weight distribution. This creates a composition with optimal fluidity for application that maintains sufficient dimensional stability under centrifugal forces during tire operation.
4Manufacturing precision
If multiple intermediate handling phases are used in application, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent merges the extrusion and deposition operations into a single continuous process step. The self-sealing composition is extruded directly onto the tire inner surface in one operation, eliminating intermediate handling phases while maintaining application precision through controlled extrusion parameters.
Solution Approach 2:
The patent implements continuous extrusion and deposition of the self-sealing composition along the tire circumference. This continuous operation maintains manufacturing precision through consistent material flow while significantly increasing productivity by eliminating discrete handling steps.
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 method ensures effective crosslinking and deposition of the self-sealing composition, maintaining airtightness and reducing rolling resistance, while allowing for homogeneous mass distribution and simplified application across various tire sizes without specialized tools.
Implementation Method 1
They are capable, under the effect of the internal pressure in the tire, of flowing into the flow paths of the air towards the outside, with a view to sealing them and re-establishing airtightness
Implementation Method 2
the composition is crosslinked in an extrusion die under controlled temperature and speed conditions
Implementation Method 3
A process for applying a rubber-based self-sealing composition on the internal surface of a tire using an extrusion method
Data Source
AI summary
The process includes a non-crosslinked self-sealing composition which is introduced into an extrusion means, the geometric and thermodynamic characteristics of which have been specially adapted. The speed and temperature conditions of the extrusion means are adjusted so that, at an application nozzle forming the outlet die of the extrusion means, the self-sealing composition is crosslinked. The application nozzle is brought close to the internal surface of the casing previously set in relative motion with respect to the application nozzle, and an extruded and crosslinked bead that has a given width and profile is deposited directly on the internal surface of the casing.