Tire Mold Vent Hole Surface Texture for Air Discharge
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Solution Overview
Problem
Existing tire molds face challenges in delaying the blocking timing of vent holes, leading to residual air and appearance quality defects in pneumatic tires due to uneven surface textures and incomplete air discharge.
Innovation Solution
A tire mold with a smooth surface texture in the outer edge region surrounding the vent hole opening and a rougher surface in the peripheral region, ensuring better adhesion and fluidity control to delay vent hole blocking, thereby reducing air residuals and enhancing appearance quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the surface of the tire molding surface is made rough, then the uncured rubber fluidity is improved and adhesion is reduced, but the vent hole blocking timing is advanced causing air residue and lightness defects
Solution Approach 1:
The invention applies different surface roughness characteristics to different regions of the tire molding surface. The peripheral region has a rough surface to improve rubber fluidity and prevent sticking, while the inner edge region surrounding the vent hole has a smooth surface to delay rubber blocking and extend air discharge time. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Manufacturing precision
If the surface of the tire molding surface is made smooth, then the uncured rubber adhesion is increased and fluidity is lowered, but the vent hole blocking timing is delayed improving air discharge, however rubber sticking occurs
Solution Approach 1:
The invention applies different surface roughness characteristics to different regions of the tire molding surface. The peripheral region has a rough surface to improve rubber fluidity and prevent sticking, while the inner edge region surrounding the vent hole has a smooth surface to delay rubber blocking and extend air discharge time. This local differentiation resolves the contradiction by optimizing each region for its specific function.
3Manufacturing precision
If vent holes are arranged at positions where air tends to remain, then air discharge is improved, but the uncured rubber blocks the vent holes earlier reducing discharge effectiveness
Solution Approach 1:
The invention applies different surface roughness characteristics to different regions of the tire molding surface. The peripheral region has a rough surface to improve rubber fluidity and prevent sticking, while the inner edge region surrounding the vent hole has a smooth surface to delay rubber blocking and extend air discharge time. This local differentiation resolves the contradiction by optimizing each region for its specific 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
The solution effectively delays vent hole blocking, extends air discharge time, and reduces air residuals, thereby suppressing the generation of lightness and maintaining the appearance quality of pneumatic tires.
Implementation Method 1
the uncured rubber tends to stick fast and the fluidity is lowered in the outer edge region which surrounds the opening of the vent hole
Implementation Method 2
if the surface of the tire molding surface is rough, there is a tendency that the uncured rubber does not stick fast and the fluidity is improved
Data Source
AI summary
A tire mold has a tire molding surface. The tire molding surface is pressed against an outer surface of an uncured tire. A vent hole is provided in the tire molding surface. A surface of an outer edge region surrounding an opening of the vent hole is formed by a smooth surface. The smooth surface is smoother than a surface in a peripheral region of the outer edge region.