A method of producing a geogrid

摘要

In order to produce a geogrid having increased tensile strength per unit weight, a specially profiled starting material 1 is used. The starting material 1 has pronounced ribs 2 min on each face, merging into sloping sides. Between the ribs 2 min , there are holes 4 on a square grid. The mean thickness of the longitudinal elements 2 is substantially greater than the mean thickness of the interconnecting elements 3, and the cross-sectional area a of the longitudinal elements 2 is at least 2.5 times the transverse cross-sectional area b of the interconnecting elements 3. The starting material 1 is stretched longitudinally to form a geogrid 5. The longitudinal elements 2 are stretched out into continuous oriented strands 7. The centres of the junctions 9 have reduced in thickness by at least 10% but substantially less than the percentage reduction at the thinnest parts of the strands 7.