Patent ID: 9556580
Date: 2017-01-31
CPC Classifications: B29C,B29D,B29K,B32B,D03D,D04H,D10B,E01C,E02D,Y10T

Claim:
1. A multi-axial integral geogrid for use in reinforcing a civil engineering structure, comprising a generally uniform array of substantially straight highly molecularly oriented transverse strands or ribs interconnected by partially molecularly oriented junctions extending transversely across said geogrid in spaced apart rows and a plurality of substantially straight highly molecularly oriented connecting strands or ribs interconnecting said partially molecularly oriented junctions in adjacent rows to form apertures or openings between adjacent highly molecularly oriented strands or ribs and partially molecularly oriented junctions, said integral geogrid being formed by biaxially stretching a substantially uniplanar starting sheet material having substantially planar parallel faces and a defined pattern of holes or depressions which form said apertures or openings in the resulting multi-axial geogrid, said substantially straight highly molecularly oriented transverse strands or ribs remaining substantially uniplanar with said substantially straight highly molecularly oriented connecting strands after stretching such that outer surfaces of both the transverse strands or ribs and the connecting strands are substantially in the same plane and the geogrid has substantially planar parallel faces, said highly molecularly oriented strands or ribs having an aspect ratio at a longitudinal midpoint of said highly molecularly oriented strands or ribs which is greater than 1.0.