Polyolefin Film Self-Sealing Tyre Puncture Management
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Solution Overview
Problem
Self-sealing tires face challenges in maintaining optimal sealing performance and structural stability at high temperatures and mechanical stresses, particularly during vulcanization and road use, due to the limitations of traditional self-supporting films with high melting temperatures.
Innovation Solution
The use of a self-supporting thermoplastic film based on polyolefins with a fluidity index less than 4, which maintains deformability and mechanical consistency, allowing for improved joinability, sealing capacity, and easy identification of punctures, while resisting thermal and mechanical stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional self-supporting films with high melting temperatures are used, then structural stability at high temperatures is improved, but sealing performance and deformability deteriorate
Solution Approach 1:
The patent changes the material parameter from traditional high-melting-point polymers to polyolefin with controlled fluidity index (less than 4), which maintains structural stability while enabling optimal deformability and sealing performance at vulcanization temperatures
Solution Approach 2:
The patent uses composite material composition combining polyolefin with specific fluidity characteristics and elastomeric materials, creating a sealing composition that integrates both structural stability and sealing effectiveness
2Reliability
If sealing composition with high fluidity and stickiness is used, then sealing capacity is improved, but handling and manufacturing difficulty increases
Solution Approach 1:
The patent introduces a self-supporting polyolefin film as an intermediary carrier that holds the sealing composition in a manageable state during manufacturing, enabling easy handling while maintaining high sealing capacity through controlled fluidity
Solution Approach 2:
The sealing composition is pre-applied onto the self-supporting film before vulcanization, allowing it to be positioned and handled in advance in a stable state, then activated to exhibit high fluidity and sealing capacity when needed
3Ease of manufacture
If sealing composition is made more rigid and compact, then handling ease is improved, but sealing performance deteriorates
Solution Approach 1:
The patent creates a dynamic material system where the sealing composition transitions from a rigid, compact state during handling to a fluid, deformable state during sealing operation, achieving both handling ease and sealing performance through temperature-activated fluidity changes
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 polyolefin-based film ensures enhanced sealing performance and structural stability, allowing for effective sealing of punctures and easy identification of perforations, even at high temperatures, and facilitates recycling of semifinished products.
Implementation Method 1
The sealing composition within the finished tyre (moulded and vulcanised), even if having a certain elasticity, is generally deformable and sticky
Implementation Method 2
A self-sealing tyre comprises at least one sealing composition layer which can adhere to a pointed object that perforates the tyre
Implementation Method 3
Such films also perform an important function of support for the sealing composition, allowing the transportation and manipulation thereof on the plants
Data Source
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AI summary
The present invention relates to a self-sealing tyre for vehicle wheels comprising at least one carcass ply, a tread band applied in radially outer position to said carcass ply in a crown zone, optionally a liner applied in radially inner position to said carcass ply, a sealing composite applied in radially inner position to the liner and axially extended at least at a part of the crown portion of the tyre; wherein said sealing composite comprises a self-supporting thermoplastic film comprising at least 50% by weight with respect to the weight of the film itself of at least one or more polyolefins, wherein the at least one polyolefin has a fluidity index (MFI) of less than 4 gram per 10 minutes, and a sealing composition layer associated with and supported by said self-supporting thermoplastic film.