Abstract: The invention relates to a sport-technical layer for use in an artificial lawn system in particular intended for sports fields, which artificial lawn system is built up at least of a substrate to which artificial grass fibres are attached as well as the sport-technical layer extending under said substrate, which sport-technical layer comprises at least one damping sublayer made of a synthetic foam, which damping sublayer made of a synthetic foam is built up of an essentially rigid flat plate, which plate is provided with flatness-enhancing means. The invention further relates to an artificial lawn system provided with such a sport-technical layer. According to the invention, the sport-technical layer is to that end characterised in that said flatness-enhancing means comprise at least one first slot assembly of at least two closely spaced slots formed in a respective upper surface or bottom surface of the plate, which slots extend in a first direction of the plate.

Abstract: Energy absorbing material comprising polyolefin particles having as a continuous phase a copolymer of ethylene or propylene and one or more ?-olefin monomers, the copolymer having a density of at most 910 kg/ms and the particles having been formed by cutting at a temperature above the glass transition temperature of the polyolefin, and use of the energy absorbing material as infill material in synthetic grass structures.

Abstract: The invention relates to a device for winding an element built up of at least one elongate, threadlike strand on a winding element, said device comprising a frame provided with at least: an inlet for the elongate, threadlike element, and a winding element to be rotatably driven about a winding shaft, said device furthermore comprising drive means at least for rotatably driving the winding element. According to the invention, the winding device is characterized in that twisting means are mounted in the frame, which twisting means impart one or more turns (twists in the case of a singlestrand elongate, threadlike element, or twines in the case of a multistring elongate, threadlike element) per unit length to the elongate, threadlike element before said elongate, threadlike element is wound on the winding element.

Abstract: The present invention relates to a device for measuring the static and/or dynamic friction coefficient of a surface, in particular a natural or artificial grass surface, which device comprises a housing placed on supports, which is to be positioned on the surface to be examined; a rotatable shaft, which is vertically disposed in said housing; a body connected to the end of said shaft that faces towards the surface, which body comprises a contact surface which can be brought into contact with the surface to be examined; as well as measuring means for measuring, during operation, the torque caused by the friction between the surface to be examined and the contact surface of the rotating body. The object of the present invention is to provide a device for measuring the static and/or dynamic friction coefficient of a surface which provides a more reliable and reproducible measuring result and which is furthermore user-friendly and easy to transport.