HDPEndi PVC

Zipangizo za pulasitiki zimakhala zotanuka kwambiri komanso zosavuta kupukutidwa. Zitha kuumbidwa, kukanidwa kapena kuponyedwa m'mawonekedwe osiyanasiyana. Zimapangidwa makamaka ndi mafuta ndi gasi wachilengedwe. Pali mitundu iwiri ya mapulasitiki; thermoplastics ndi thermoset polimas.

Ngakhale ma polima a thermoset amatha kusungunuka ndi kupangidwa kamodzi kokha ndipo amakhalabe olimba akazizira, ma thermoplastic amatha kusungunuka ndi kupangidwanso mobwerezabwereza ndipo motero amatha kubwezeretsedwanso.

Mapulasitiki a Thermoplastic amagwiritsidwa ntchito popanga zidebe, mabotolo, matanki amafuta, matebulo ndi mipando yopindika, mashedi, matumba apulasitiki, zotetezera mawaya, mapanelo osapsa ndi zipolopolo, zoseweretsa za pa dziwe, mipando ya mipando, zovala ndi mapaipi.

Pali mitundu ingapo ya thermoplastics, ndipo imagawidwa m'magulu a amorphous kapena semi-crystalline. Awiri mwa iwo ndi amorphousPVC(polyvinyl chloride) ndi semi-crystalline HDPE (polyethylene yochuluka kwambiri). Zonsezi ndi ma polima opangidwa ndi zinthu zosiyanasiyana.

Polyvinyl chloride (PVC) ndi pulasitiki yotsika mtengo komanso yolimba yomwe imagwiritsidwa ntchito pomanga. Ndi pulasitiki yachitatu yomwe imagwiritsidwa ntchito kwambiri pambuyo pa polyethylene ndi polypropylene ndipo imagwiritsidwa ntchito kwambiri popanga mapaipi. Ndi yopepuka komanso yolimba, zomwe zimapangitsa kuti ikhale yotchuka kwambiri pakugwiritsa ntchito mapaipi pamwamba pa nthaka ndi pansi pa nthaka. Ndi yolimba kwambiri ndipo ndi yoyenera kuyikidwa mwachindunji komanso popanda ngalande.

Kumbali ina, polyethylene yokhuthala kwambiri (HDPE) ndi polyethylene thermoplastic yopangidwa kuchokera ku mafuta. Ili ndi mphamvu zambiri, ndi yolimba, ndipo imatha kupirira kutentha kwambiri.
Mapaipi a HDPE ndi osavuta kugwiritsa ntchito m'mapaipi apansi panthaka, chifukwa apezeka kuti amanyowetsa ndikuyamwa mafunde ogwedezeka, motero amachepetsa kukwera kwa madzi komwe kungakhudze dongosolo. Alinso ndi kukana bwino kwambiri kupsinjika kwa mafupa ndipo amamva kuwawa komanso kutentha kwambiri.

Ngakhale kuti zipangizo zonsezi ndi zolimba komanso zolimba, zimasiyana mphamvu ndi zina. Kumbali imodzi, zimapangidwa kuti zipirire kupsinjika kosiyanasiyana. Kuti zikwaniritse kupanikizika kofanana ndi chitoliro cha PVC, khoma la chitoliro cha HDPE liyenera kukhala lokhuthala nthawi 2.5 kuposa chitoliro cha PVC.

Ngakhale zipangizo zonsezi zimagwiritsidwanso ntchito popanga zozimitsa moto,HDPEyapezeka kuti ndi yoyenera komanso yotetezeka kugwiritsa ntchito chifukwa imatha kuyatsa zozimitsa moto kufika pamlingo woyenera. Ngati yalephera kuyamba mkati mwa chidebecho ndikusweka, chidebe cha HDPE sichidzasweka ndi mphamvu zambiri monga chidebe cha PVC.

Mwachidule:

1. Polyvinyl Chloride (PVC) ndi vinyl polima yotsika mtengo komanso yolimba yomwe imagwiritsidwa ntchito pomanga, pomwe High Density Polyethylene (HDPE) ndi polyethylene thermoplastic yopangidwa kuchokera ku mafuta.
2. Polyvinyl chloride ndi pulasitiki yachitatu yomwe imagwiritsidwa ntchito kwambiri, ndipo polyethylene ndi imodzi mwa pulasitiki zomwe zimagwiritsidwa ntchito kwambiri.
3. PVC ndi yopanda mawonekedwe, pomwe HDPE ndi yopyapyala pang'ono.
4. Zonse ziwiri ndi zolimba komanso zolimba, koma zimakhala ndi mphamvu zosiyana komanso ntchito zosiyanasiyana. PVC ndi yolemera komanso yolimba, pomwe HDPE ndi yolimba, yolimba komanso yolimba.
5. Mapaipi a HDPE apezeka kuti amaletsa ndikuyamwa mafunde ogwedezeka, motero amachepetsa kukwera kwa madzi komwe kungakhudze dongosolo, pomwe PVC singathe.
6. HDPE ndi yoyenera kwambiri poikapo mpweya wochepa, pomwe PVC ndi yoyenera kwambiri poikapo m'manda mwachindunji komanso popanda ngalande.