Artificial Turf Fiber Structure for Infill-Free Drainage and Cushioning

The patent applies local quality by creating a density gradient within the fiber layer, where fiber density varies from the bottom to the top surface. The bottom portion has higher fiber density for structural support, while the top surface has lower fiber density to mimic natural grass appearance and provide volume effect. This localized variation in density resolves the contradiction between manufacturing simplicity and natural grass mimicry accuracy.

The patent extracts and eliminates the infill material layer from the turf structure. Instead of using separate infill materials (sand, rubber granules) to provide shock-absorbency and support, the invention integrates these functions directly into the fiber layer itself through the density gradient design. The bottom dense portion provides structural support while the overall structure delivers shock-absorbing properties, thereby reducing device complexity and removing environmental concerns associated with infill materials.

The patent removes infill materials that block drainage pathways. By eliminating sand and rubber granule infills, the turf structure allows water to drain freely through the fiber layer and into the underlying base. The density gradient within the fiber layer itself provides dimensional stability without requiring infill materials, thus resolving the contradiction between stability and drainage efficiency.

The patent applies local quality by implementing a density gradient within the fiber layer that creates varying optical and physical properties at different depths. The top surface has lower fiber density that allows light to penetrate and reflect in a manner that mimics natural grass blades, creating the volume effect and natural appearance. This internal density variation enables the turf to achieve natural appearance without requiring infill materials or complex multi-layer structures.