Vulcanization Bladder Pressure Control for Tire Defects
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Solution Overview
Problem
Existing vulcanization devices face challenges in applying sufficient internal pressure to green tires in the initial stage of vulcanization while preventing over-vulcanization, often leading to defects, especially in tires with high silica content, and require increased equipment size to achieve efficient pressure management.
Innovation Solution
A vulcanization device with a tube-like bladder connected to heating and pressurizing medium supply lines, where a pressurizing medium with relatively low pressure is initially supplied to inflate the bladder, followed by a heating medium, and then a pressurizing medium with relatively high pressure is circulated to increase internal pressure, reducing the risk of over-vulcanization without enlarging the equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low internal pressure is applied by the vulcanization bladder to the green tire in the initial stage of vulcanization, then the vulcanization process can be maintained, but the unvulcanized rubber flows insufficiently causing vulcanization defects
Solution Approach 1:
The patent applies preliminary action by first inflating the vulcanization bladder with pressurizing medium before introducing the heating medium. This preliminary pressurization ensures that sufficient internal pressure is established in the initial stage, preventing insufficient rubber flow and vulcanization defects while maintaining reliable vulcanization process control
2Reliability
If the vulcanization time is determined on the basis of the tread portion requiring the longest vulcanization time, then complete vulcanization is achieved, but over-vulcanization occurs in portions other than the tread portion
Solution Approach 1:
The patent uses preliminary action by first establishing adequate internal pressure in the vulcanization bladder before introducing the heating medium. This preliminary pressurization step ensures uniform pressure distribution throughout the tire, allowing the vulcanization time to be optimized based on the tread portion without causing over-vulcanization in other areas
Solution Approach 2:
The patent applies parameter changes by controlling the internal pressure parameter in the vulcanization bladder. By maintaining appropriate pressure levels during the vulcanization process, the patent enables optimized vulcanization time for the tread portion while preventing over-vulcanization in other areas through pressure-controlled heat treatment
3Stress or pressure
If a tank for preliminarily mixing steam and inert gas is used to increase internal pressure, then sufficient pressure is applied to the green tire, but the equipment size increases
Solution Approach 1:
The patent extracts the pressurizing function from a separate tank system and integrates it directly into the vulcanization bladder operation. By using a pressurizing medium supply system that can be directly connected to the bladder without requiring a separate mixing tank, the patent achieves sufficient internal pressure while minimizing equipment size
Solution Approach 2:
The patent applies multi-functionality by designing the vulcanization bladder system to perform both heating and pressurization functions through integrated supply lines. The pressurizing medium supply line and heating medium supply line are both connected to the same bladder system, allowing one system to serve multiple purposes without requiring separate dedicated equipment for each function
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 adequate internal pressure is applied to the tire in the initial stage, preventing insufficient rubber flow and reducing the risk of over-vulcanization, while maintaining a lower vulcanization temperature and compact equipment design.
Implementation Method 1
The pressurizing medium having a relatively low pressure flows and is supplied into the vulcanization bladder through the pressurizing medium low-pressurization/supply line to inflate the vulcanization bladder at a start of vulcanization
Implementation Method 2
A heating medium is supplied into the vulcanization bladder through the heating medium supply line
Implementation Method 3
Media in the vulcanization bladder circulates through the circulation line upon the heating medium being supplied into the vulcanization bladder
Implementation Method 4
The media having a relatively high pressure flows and is supplied in the vulcanization bladder through the pressurizing medium supply line upon the media in the vulcanization bladder circulating through the circulation line to increase internal pressure of the vulcanization bladder
Data Source
AI summary
Provided are a vulcanization device for a pneumatic tire and a method for vulcanizing a pneumatic tire. A pressurizing medium having a relatively low pressure is supplied through a pressurizing medium low-pressurization/supply line into a vulcanization bladder having a tube-like shape inserted into a green tire in a vulcanization mold to inflate the vulcanization bladder. Thereafter, a heating medium is supplied through a heating medium supply line into the vulcanization bladder (2). Then, a pressurizing medium having a relatively high pressure is supplied through a pressurizing medium supply line into the vulcanization bladder to increase internal pressure of the vulcanization bladder while the media in the vulcanization bladder are circulated through a circulation line extending outside the vulcanization bladder, thereby vulcanizing the green tire.