Mzere Wowonjezera Mapaipi a HDPE Wautali Wautali

Chitoliro cha HDPE ndi mtundu wa chitoliro cha pulasitiki chosinthasintha chomwe chimagwiritsidwa ntchito potumiza madzi ndi gasi ndipo nthawi zambiri chimagwiritsidwa ntchito m'malo mwa mapaipi okalamba a konkire kapena achitsulo. Chopangidwa kuchokera ku HDPE ya thermoplastic (polyethylene yochuluka kwambiri), kuchuluka kwake kosalowa madzi komanso mgwirizano wamphamvu wa mamolekyu kumapangitsa kuti chikhale choyenera mapaipi opanikizika kwambiri. Chitoliro cha HDPE chimagwiritsidwa ntchito padziko lonse lapansi pazinthu monga mapaipi amadzi, mapaipi a gasi, mapaipi a zimbudzi, mizere yosamutsira madzi, kuthirira kumidzi, mizere yoperekera moto, njira zamagetsi ndi zolumikizirana, ndi mapaipi amadzi amvula ndi zotulutsira madzi.

Mapaipi akuluakulu a HDPE ndi olimba, opepuka, osasunthika komanso osagwira ntchito ndi mankhwala. Amapereka mphamvu zochepa pakuyika komanso nthawi yayitali yogwirira ntchito. Mapaipi awa amapezeka muutali wokhazikika wa 3, 6, 12 ndi 14m. Utali wapadera wa mapaipi ukhoza kupangidwa kuti ukwaniritse zosowa zilizonse.

Chitoliro cha HDPE ndi chitoliro cha pulasitiki chosinthasintha chopangidwa ndi polyethylene yotsika kwambiri yomwe imagwiritsidwa ntchito kwambiri ponyamula madzi ndi mpweya wochepa kutentha. Posachedwapa, mapaipi a HDPE agwiritsidwa ntchito kwambiri ponyamula madzi akumwa, zinyalala zoopsa, mpweya wosiyanasiyana, matope, madzi amoto, madzi amvula, ndi zina zotero. Kugwirizana kwamphamvu kwa zinthu za chitoliro cha HDPE kumathandizira kuti chigwiritsidwe ntchito pa mapaipi amphamvu kwambiri. Mapaipi a polyethylene ali ndi mbiri yayitali komanso yodziwika bwino yogwirira ntchito pa gasi, mafuta, migodi, madzi, ndi mafakitale ena. Chifukwa cha kulemera kwake kochepa komanso kukana dzimbiri kwambiri, makampani a mapaipi a HDPE akukula kwambiri. Mu chaka cha 1953, Karl Ziegler ndi Erhard Holzkamp adapeza polyethene yotsika kwambiri (HDPE). Mapaipi a HDPE amatha kugwira ntchito mokwanira pa kutentha kwakukulu kuyambira -2200 F mpaka +1800 F. Komabe, kugwiritsa ntchito Mapaipi a HDPE sikulangizidwa pamene kutentha kwa madzi kukupitirira 1220 F (500 C).

Mapaipi a HDPE amapangidwa pogwiritsa ntchito polymerization ya ethylene, yomwe ndi mafuta opangidwa kuchokera ku mafuta. Zowonjezera zosiyanasiyana (zokhazikika, zodzaza, zopukutira, zofewetsa, zodzola, zopaka utoto, zoletsa malawi, zoyambitsa kuphulika, zolumikizira, zowonjezera zowononga ultraviolet, ndi zina zotero) zimawonjezedwa kuti apange chitoliro chomaliza cha HDPE ndi zigawo zake. Kutalika kwa chitoliro cha HDPE kumapangidwa potenthetsa utomoni wa HDPE. Kenako umatulutsidwa kudzera mu die, yomwe imatsimikiza kukula kwa payipi. Kukhuthala kwa khoma la Pipe kumatsimikiziridwa ndi kuphatikiza kwa kukula kwa die, liwiro la screw, ndi liwiro la thirakitala yonyamula. Nthawi zambiri, 3-5% yakuda kwa kaboni imawonjezeredwa ku HDPE kuti ikhale yolimba ku UV, zomwe zimapangitsa mapaipi a HDPE kukhala akuda. Mitundu ina yamitundu imapezeka koma nthawi zambiri sigwiritsidwa ntchito kawirikawiri. Chitoliro cha HDPE chokhala ndi utoto kapena mizere nthawi zambiri chimakhala chakuda cha 90-95%, pomwe mzere wamtundu umaperekedwa pa 5% ya pamwamba pakunja.