Embedded Thread for Air Dispersion in Extruded Rubber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Blisters defects in pneumatic tires occur during vulcanization due to inadequate air dispersion between rubber layers, which existing methods like air absorptive organic fiber cords fail to effectively suppress, as these cords may separate or change position during tire molding.
Innovation Solution
Embedding a thread with a breaking strength of 100 N or less into the extruded rubber member, specifically at the interface of rubber layers, to enhance air dispersion during vulcanization, preventing blister defects without affecting the tire molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air absorptive organic fiber cords not covered by rubber are disposed on at least one surface of the carcass layer to absorb air enclosed between the carcass layer and adjacent members, then air absorption capability is improved, but the organic fiber cords may separate or relatively change in position in the tire molding step
Solution Approach 1:
The organic fiber cord is embedded within the rubber composition rather than being placed on the surface, creating a nested structure where the cord is protected by the rubber matrix. This prevents the cord from separating or changing position during tire molding while maintaining its air absorption capability at the interface between rubber layers
Solution Approach 2:
The organic fiber cord is pre-embedded in the rubber composition before the tire molding step, ensuring proper positioning is established in advance. This preliminary action prevents position instability during subsequent molding operations
2Reliability
If threads are embedded in the extruded rubber member at the interface of rubber layers to enhance air dispersion during vulcanization, then blister defect suppression is improved, but the thread breaking strength must be controlled to not affect tire molding
Solution Approach 1:
The breaking strength parameter of the thread is specifically controlled to be 100 N or less. This parameter change allows the thread to fulfill its air dispersion function during vulcanization while being weak enough not to interfere with the tire molding process, resolving the contradiction between effectiveness and non-interference
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 embedded thread effectively disperses air at the interface of rubber layers, significantly reducing blister defects and ensuring smooth tire molding by maintaining thread position, resulting in a lower blister defect occurrence rate compared to conventional methods.
Implementation Method 1
enhancing air dispersion during vulcanization at an interface of rubber layers, and effectively suppressing blister defects
Data Source
AI summary
Provided are a manufacturing method and a manufacturing device for an extruded rubber member. The manufacturing method for an extruded rubber member includes extruding at least one type of rubber from a die, the method including the steps of inserting at least one thread into a flow channel of the at least one type of rubber, and embedding the at least one thread in a longitudinal direction of the extruded rubber member.