Patent ID: 8551602

Claim:
A sport-technical layer for use in an artificial lawn system for sports fields, the artificial lawn system including at least a substrate to which artificial grass fibers are attached, and the sport-technical layer being configured to extend under the substrate, said sport-technical layer, comprising: at least one damping sublayer made of a synthetic foam, the at least one damping sublayer including an essentially rigid flat plate, the essentially rigid flat having an upper surface, a lower surface and a flatness-enhancing device, the flatness-enhancing device having a first slot assembly having first and second slots and a second slot assembly having first and second slots, the first slot of the first slot assembly being disposed in the upper surface of the essentially rigid flat plate and the second slot of the first slot assembly being disposed in the bottom surface of the essentially rigid flat plate, the first and second slots of the first slot assembly being separated from each other by an intermediate flange, and the first and second slots of the first slot assembly being spaced further apart than the width of the slots, the first and second slots of the first slot assembly extending in a first direction along the essentially rigid flat plate, and the first slot of the second slot assembly being disposed in the upper surface of the essentially rigid flat plate and the second slot of the second slot assembly being disposed in the bottom surface of the essentially rigid flat plate, the second slot assembly extending in a second direction along the essentially rigid flat plate, the first and second directions being different from each other.