Welding of the film – is the basic approach polipropilena. compound geomembrane – the process of obtaining permanent connection with the chemical welding or diffusion welding geomembrane, which resulted in the seam between connected surfaces of polypropylene disappears and forms the transition from one part to another. Polypropylene has a high capacity and relatively low thermal conductivity. Therefore, the welding of the geomembrane carried out at temperatures at which the polypropylene is a plastic. The quality of the joint, which is obtained by plastic welding, depending on its composition, terms of welding technology. From the large of pvc welding methods most frequently used contact-heat welding. Contact-weld heat – it is a simple and low-cost method, which ensures very high performance compounds geomembrane.

Today's most popular and best-welded contact and heat welding are: – hdpe (High Density Polyethylene) – hdpe (high-density polyethylene) – pp (polypropylene). Data materials are characterized by relatively low melt viscosity, a large temperature range of the viscous-fluid state (above 55 C), a relatively low pour point (125-170 C). Therefore, pp, hdpe, ldpe refer to polymers that are well welded. When welding hdpe heaters can communicate with both internal surfaces, as well as with external (weld fusion and weld penetration, respectively). Welding of plastic film thickness to 150 microns best carried out on the technology supply heat to one side. Welding of high pressure polyethylene film thickness of 25-100 microns is conducted at a temperature of 210 C instrument and contact time of 0, 5-0, 6 sekundy. polyethylene film thickness of 25-100 microns is carried out at 240 with the tool and the duration of contact of 0, 55-0, 68 sekundy. polyethylene film thickness of 25-100 microns takes place at 240 with the tool and duration of exposure 0, 6-0, 75 seconds.

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