Polymer meshes with square or rectangular shapes formed by stretching can be divided into unidirectional stretching and biaxial stretching according to the different stretching directions during fabrication. It is punched on the extruded polymer sheet (polypropylene or high density polyethylene) www.zhangjiakoubanjia.cnwww.foxiangdiaoke.cnwww.yanglaoyua.cnwww.shiguanyin.cn
www.luomazhu.net.cn www.xingtaibanjia.com.cnand then directionally stretched under heating conditions. The unidirectional tension grids are made by stretching along the length of the sheet only; the biaxial tension grids are made by stretching the unidirectional tension grids in the direction perpendicular to their length.由于塑料土工格栅在制造中聚合物的高分子会随加热延伸过程而重新排列定向，加强了分子链间的联结力，达到了提高其强度的目的。其延伸率只有原板材的10%～15%。如果在土工格栅中加入炭黑等抗老化材料，可使其具有较好的耐酸、耐碱、耐腐蚀和抗老化等耐久性能。
In the manufacture of plastic geogrids, polymer molecules are rearranged and orientated along with the heating extension process, which strengthens the bonding force between molecular chains and achieves the purpose of improving their strength. Its elongation is only 10%-15% of the original sheet. If carbon black and other anti-aging materials are added to geogrids, they will have good durability such as acid, alkali, corrosion and aging resistance.