經過拉伸形成的具有方形或矩形的聚合物網材，按其制造時拉伸方向的不同可為單向拉伸和雙向拉伸兩種。它是在經擠壓制出的聚合物板材（原料多為聚丙烯或高密度聚乙烯）上沖孔，然后在加熱條件下施行定向拉伸。單向拉伸格柵只沿板材長度方向拉伸制成；雙向拉伸格柵則是繼續將單向拉伸的格柵再在與其長度垂直的方向拉伸制成。

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.

由于塑料土工格柵在制造中聚合物的高分子會隨加熱延伸過程而重新排列定向，加強了分子鏈間的聯結力，達到了提高其強度的目的。其延伸率只有原板材的10%～15%。如果在土工格柵中加入炭黑等抗老化材料，可使其具有較好的耐酸、耐堿、耐腐蝕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.