Tire Retreading Roller Width and Pressure Control
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Solution Overview
Problem
The existing retreading methods require a different roller for each tire casing shape and tread pattern, leading to inefficiencies and potential tread elongation due to compression.
Innovation Solution
A method using a roller with a width less than the tread, allowing for the same roller to be used across different tire casings, with multiple rollers and localized heating of the hot-melt material to ensure adhesion without excessive tread compression, and optional reinforcement to manage tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a roller matching the tread profile across its entire width is used, then the adhesion of the tread to the carcass is improved, but it requires a different roller for each tire casing type and can cause tread elongation
Solution Approach 1:
The patent divides the rolling operation into multiple sequential passes using a single roller with width less than the tread width. The roller applies pressure to specific zones of the bonding layer in succession, achieving complete adhesion without requiring multiple specialized rollers for different tread widths.
Solution Approach 2:
The patent employs a universal roller design with fixed dimensions that can be used across different tire casing types. This single roller performs the adhesion function for various tread widths through multiple passes, eliminating the need for specialized rollers for each casing type.
2Reliability
If a roller matching the tread profile across its entire width is used, then the adhesion of the tread to the carcass is improved, but it causes elongation of the tread
Solution Approach 1:
The patent segments the rolling operation into multiple narrow passes, which distribute the compressive force more evenly and reduce localized stress concentration. This approach maintains adhesion while minimizing the overall compression and elongation of the tread structure.
Solution Approach 2:
The patent applies pressure locally through a narrow roller that contacts only a portion of the tread width at any given time. This localized pressure application achieves bonding without subjecting the entire tread to excessive compression forces that would cause elongation.
3Productivity
If multiple rollers are used to reduce cycle time, then the productivity is improved, but the device complexity increases
Solution Approach 1:
The patent implements continuous rolling action through multiple sequential passes with the same roller, ensuring that the bonding process is completed efficiently without interruption. This maintains high productivity while avoiding the complexity of coordinating multiple rollers simultaneously.
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
Enables efficient retreading of various tire casings with reduced cycle times and minimized tread elongation, using a single roller setup for different widths and patterns, while maintaining effective adhesion and reducing tension in the tread.
Implementation Method 1
a hot-melt bonding layer that ensures the adhesion of the tread to the carcass and which softens when it is heated to a predetermined temperature
Implementation Method 2
the hot-melt layer is heated while applying pressure to the tread, then the casing is allowed to cool in order to obtain the adhesion of the tread to the carcass
Data Source
AI summary
A method of retreading a tire casing includes the step of disposing a cured rubber tread on a carcass with a layer of hot-melt material interposed between the tread and the carcass. The method continues with the step of rollering the tread by means of at least one roller with a width (r) that is less than a width (b) of the tread.