Chingwe Chowonjezera cha Mapaipi Otenthetsera Kutentha a HDPE

Chingwe chopangira chitoliro chotenthetsera chapangidwa ndi chitoliro chapadera cha PE chotenthetsera, kuthamanga kwa extrusion kumakhala kokhazikika, ndipo makulidwe a chitoliro chokhala ndi makoma owonda ndi ofanana. Liwiro la extrusion ndi lachangu, kutulutsa kwa mtundu wophulika kumawonjezeka kwambiri, pamwamba pake pamakhala kowala, ndipo makina ogwirira ntchito ndi okwera.

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.