| 摘要 |
PROBLEM TO BE SOLVED: To provide a synthetic-grass structure eliminating to the utmost negative influence on force applied horizontally to the ground when an athlete goes forward. SOLUTION: This synthetic-grass structure comprises a sheet substrate 1 with a plurality of filiform formations 2 extending from the substrate so as to simulate natural grass cover and a particulate filling material or filler 3 consisting of a mass of a granular plastic material dispersed between the filiform formations 2 so as to keep them in a substantially upright condition. The filler 3 forms a layer of thickness not greater than 40 mm, has a grain size smaller than 5 mm, and consists of a plastic material with a value of elastic return such that the structure has a KA value of 35-50, which allows its use for making athletics tracks. COPYRIGHT: (C)2005,JPO&NCIPI
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