Laiwu City of geotextile material Co., impermeable geomembrane is mainly used to produce geomembrane width 4-6m, a maximum width of 8 meters and a weight of 200-1500g / m2, tensile, tear, physical and mechanical properties of bursting and other indicators of high, to meet civil engineering needs irrigation, municipal, construction, transportation, subways, tunnels and so on. Geomembrane welding a bead lap width: 80 ~ 100mm; natural folds flat and vertical, respectively: 5% to 8%; reserve amount of stretching: 3% to 5%; scrap remaining amount: 2% to 5%. 2, the fusion welding temperature 280 ~ 300 ℃; the traveling speed 2 ~ 3m / min; weld bead form double. 3, fix damaged parts, cutting specifications of the same material, a hot melt adhesive patch, polyethylene sealant. 4. Non-woven fabric at the weld connection, using mechanical suture. 5, underwater nozzle seal sealing, using GB rubber seal sealed metal dressing and embalmed.