... . It is the extruded polymer sheets (raw materials for PP or aaHDPE) punch, and heating purposes of directional stretch. ... direction of its length vertical strentch.1) BX geogridBX geogrid are polymers by extruding, forming, punching process after the ... strengthening civil engineering and reinforcing road base.Application: Biaxial geogrig stretch plastic geogrid is used to reinforce dyke and roadbed, ...