Tire Vulcanization Mold Recess Geometry for Low Dirt Buildup

The patent applies curvature by forming the recesses with a specific curved cross-sectional shape where the width at any position is defined by a circular arc. This curved geometry prevents dirt accumulation by eliminating sharp corners and flat surfaces where debris can trap, while still forming the desired micro projections on the tire surface. The curved recess profile allows rubber to release more easily and prevents dust accumulation compared to conventional flat-bottomed recesses.

The curved cross-sectional shape of the recesses, defined by circular arcs, creates a self-cleaning geometry that minimizes dirt accumulation. The continuous curved surface without sharp edges or flat bottoms prevents rubber fragments and dust from becoming trapped, thereby maintaining the blackness of the decorative portion for extended periods without requiring frequent cleaning interruptions.

The patent defines the recess cross-section using circular arcs with specific radius ratios, creating a curved profile that is more effective at preventing dirt accumulation than flat-bottomed designs. While the manufacturing process is slightly more complex than simple flat recesses, the curved geometry significantly reduces harmful dirt accumulation by eliminating flat surfaces where debris can settle and adhere.