Application of polymeric materials in making of irrigation pipes

U radu je dan pregled polimernih materijala (polimera) koji se primjenjuju u izradi cijevi za navodnjavanje u poljoprivredi. Uvodno su objašnjene osnove nastanka, strukture i svojstava polimernih materijala. Posebno su opisane vrste polimera koje se najčešće primjenjuju u izradi cijevi za navodnjavanje – polietilen (PE), polipropilen (PP) i polivinilklorid (PVC). Najzastupljeniji tip polietilena u izradi cijevi za navodnjavanje je polietilen visoke gustoće (PEHD). Najzastupljeniji tip polipropilena u izradi cijevi za navodnjavanje je random polipropilen (PP-R). Najzastupljeniji tip polivinilklorida u izradi cijevi za navodnjavanje je polivinilklorid za vodu pod tlakom (PVC-U). U izradi polimernih cijevi najčešće se primjenjuju postupci prešanja, injekcijskog prešanja i ekstrudiranja (ekstruzije). Proizvodne linije za ekstruziju omogućuju izradu najviše tipova cijevi za navodnjavanje od svih vrsta navedenih polimera.This paper presents a review of polymeric materials (polymers) used in the production of irrigation pipes in agriculture. The basics of the formation, structure and properties of polymeric materials are explained in the introduction. Particularly described are the types of polymers that are most commonly used in the production of irrigation pipes – polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC). The most widely used type of polyethylene for making irrigation pipes is high density polyethylene (PEHD). The most common type of polypropylene in the irrigation pipeline is random polypropylene (PP-R). The most common type of polyvinylchloride in the irrigation pipeline is polyvinyl chloride for pressure water (PVC-U). In the manufacture of polymeric pipes, the processes of pressing, injection molding and extrusion (extrusion) are most commonly used. Production lines for extrusion allow the production of the most types of irrigation tubes of all mentioned types of polymers