Vulcanization Control Using Thermal Detection Probes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vulcanization methods for pneumatic tires face challenges in controlling the cross-linking degree due to unpredictable factors like temperature variations, leading to over-vulcanization or under-vulcanization, particularly affecting performance and structural integrity, especially in high-performance tires.
Innovation Solution
Implementing a method that monitors the cross-linking degree at two specific regions within the tire, using thermal-detection probes to stop heat supply when the first region reaches a desired performance-oriented cross-linking level and the second region achieves a minimum structural integrity level, ensuring optimal vulcanization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single probe is used to monitor vulcanisation at one location, then the device complexity is low, but the manufacturing precision of uniform cross-linking across the tyre is insufficient
Solution Approach 1:
The tyre is divided into multiple detection zones (first detection zone near the detection device, second detection zone at the opposite side) with separate monitoring. This segmentation allows independent monitoring of different regions to ensure uniform cross-linking throughout the tyre structure.
Solution Approach 2:
The detection device serves multiple functions: it monitors both the first detection zone directly and the second detection zone through thermal conduction, enabling comprehensive monitoring of the entire tyre vulcanisation process with a single integrated system.
2Reliability
If heat supply is stopped early to avoid over-vulcanisation, then the reliability prevents degradation, but the productivity loses time for under-vulcanised tyres
Solution Approach 1:
The system continuously monitors temperature and calculates cross-linking degree in real-time during vulcanisation. When the first cross-linking degree reaches the target value, the system provides feedback to stop heat supply, ensuring optimal vulcanisation without over-processing while maintaining efficient cycle times.
Solution Approach 2:
The detection device is pre-positioned within the tyre before vulcanisation begins, and the monitoring system is pre-calibrated with target cross-linking degree values. This preliminary preparation enables immediate and accurate detection of vulcanisation progress, allowing precise timing of heat supply termination.
3Manufacturing precision
If monitoring is performed at multiple locations, then the manufacturing precision of cross-linking control improves, but the device complexity and cost increase
Solution Approach 1:
A single detection device performs multiple monitoring functions by detecting temperature at its location and utilizing thermal conduction to monitor the opposite side of the tyre. This multi-functional approach achieves comprehensive monitoring without requiring separate detection devices for each zone.
Solution Approach 2:
Thermal conduction acts as an intermediary mechanism that transfers temperature information from the second detection zone to the first detection zone. This allows indirect monitoring of the opposite side through the tyre structure, eliminating the need for direct physical contact sensors in hard-to-reach locations.
4Ease of operation
If the detection device is placed in easily accessible location, then the ease of operation for installation is high, but the measurement precision for critical regions may be insufficient
Solution Approach 1:
The detection device positioned in the first detection zone simultaneously monitors both the first zone directly and the second zone through thermal conduction, ensuring critical regions are monitored with high precision while maintaining ease of installation.
Solution Approach 2:
Thermal conduction serves as an intermediary that extends the measurement capability of the detection device to regions that are difficult to access directly, maintaining measurement precision without compromising installation ease.
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 approach ensures consistent and optimal vulcanization, balancing performance and structural integrity by precisely controlling the cross-linking process, reducing the risk of over- or under-vulcanization and improving productivity.
Implementation Method 1
a probe for temperature detection is introduced into a predetermined tyre region. During supply of heat to the tyre, detection of the temperature of the elastomer material in relation to time is carried out close to the probe, to calculate the true vulcanisation state reached by the tyre portion where the probe is inserted.
Implementation Method 2
Another heat portion is supplied through the mould from the outside of the tyre, suitably heated by means of pipelines for circulation of steam or other heating fluid that are arranged in the vulcanisation apparatus.
Implementation Method 3
The steam under pressure admitted to the expanded bladder within the tyre is also used to supply part of the necessary heat for vulcanisation.
Implementation Method 4
said treatment aims at determining the structural stabilisation of the tyre through cross-linking of said elastomer compositions
Data Source
AI summary
A tire enclosed in a vulcanization mold is supplied with heat to cause vulcanization of same. By thermal-detection probes introduced into the tire monitoring of the cross-linking degree reached in at least one first detection region and one second detection region disposed within the tire is carried out. Head supply is stopped on occurrence of the following conditions: (i) the crosslinking degree measured in at least one of the detection regions reaches a first reference value higher than 90% of the whole cross-linking; and (ii) the cross-linking degree measured in each detection region has overcome a second pre-established reference value not exceeding about 50% of the whole cross-linking.