Zithunzi za HDPEndi PVC

Zida za pulasitiki ndi zotanuka komanso zosinthika. Amatha kuumbidwa, kukanikizidwa kapena kuponyedwa mumitundu yosiyanasiyana. Amapangidwa makamaka ndi mafuta ndi gasi. Pali mitundu iwiri ya mapulasitiki; thermoplastics ndi thermoset polima.

Ngakhale ma polima a thermoset amatha kusungunuka ndi kupangidwa kamodzi ndikukhalabe olimba atakhazikika, ma thermoplastics amatha kusungunuka ndi kupangidwa mobwerezabwereza motero amatha kubwezeretsedwanso.

Thermoplastics amagwiritsidwa ntchito popanga zotengera, mabotolo, matanki amafuta, matebulo opinda ndi mipando, zotengera, zikwama zapulasitiki, zotchingira chingwe, mapanelo oletsa zipolopolo, zoseweretsa zamadzi, zopangira upholstery, zovala ndi mapaipi.

Pali mitundu ingapo ya ma thermoplastics, ndipo amagawidwa ngati amorphous kapena semi-crystalline. Awiri a iwo ndi amorphousZithunzi za PVC(polyvinyl chloride) ndi semi-crystalline HDPE (high density polyethylene). Onsewa ndi ma polima azinthu.

Polyvinyl chloride (PVC) ndi polima 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. Ndizopepuka komanso zamphamvu, zomwe zimapangitsa kuti zikhale zodziwika kwambiri pamapulogalamu apamadzi apamwamba komanso apansi panthaka. Ndi yolimba kwambiri komanso yoyenera kuyikidwa m'manda mwachindunji komanso osayika trenchless.

Komano, high density polyethylene (HDPE) ndi polyethylene thermoplastic yopangidwa kuchokera ku petroleum. Lili ndi mphamvu zambiri, ndi lolimba, ndipo limatha kupirira kutentha kwakukulu.
Mapaipi a HDPE ndi osavuta kugwiritsa ntchito mapaipi apansi panthaka, chifukwa apezeka kuti amatsitsa ndikuyamwa mafunde owopsa, potero amachepetsa mafunde omwe angakhudze dongosolo. Amakhalanso ndi kukana kwabwino kophatikizana kophatikizana komanso amakhala ndi abrasion ndi kutentha.

Ngakhale kuti zipangizo zonsezi ndi zamphamvu komanso zolimba, zimasiyana mphamvu ndi zina. Kumbali ina, amapangidwa kuti athe kupirira zovuta zosiyanasiyana. Kuti mukwaniritse kuthamanga kofanana ndi chitoliro cha PVC, khoma la chitoliro cha HDPE liyenera kukhala lokulirapo nthawi 2.5 kuposa chitoliro cha PVC.

Ngakhale zida zonsezi zimagwiritsidwanso ntchito popanga zozimitsa moto,Zithunzi za HDPEzapezeka kuti n'zabwino komanso zotetezeka kuzigwiritsa ntchito chifukwa zimatha kuwotcha zozimitsa moto mpaka kutalika koyenera. Ikalephera kuyamba mkati mwa chidebecho ndikusweka, chidebe cha HDPE sichidzathyoka ndi mphamvu ngati chidebe cha PVC.

Mwachidule:

1. Polyvinyl Chloride (PVC) ndi polima wa vinyl wotchipa komanso wokhazikika womwe umagwiritsidwa ntchito pomanga, pomwe High Density Polyethylene (HDPE) ndi polyethylene thermoplastic yopangidwa kuchokera ku petroleum.
2. Polyvinyl chloride ndi pulasitiki yachitatu yomwe imagwiritsidwa ntchito kwambiri, ndipo polyethylene ndi imodzi mwa mapulasitiki omwe amagwiritsidwa ntchito kwambiri.
3. PVC ndi amorphous, pamene HDPE ndi theka-crystalline.
4. Onsewa ndi amphamvu komanso olimba, koma ndi mphamvu zosiyana komanso ntchito zosiyanasiyana. PVC ndi yolemera komanso yamphamvu, pomwe HDPE ndi yolimba, yosamva abrasion komanso yosatentha kwambiri.
5. Mapaipi a HDPE apezeka kuti amapondereza ndi kuyamwa mafunde odabwitsa, motero kuchepetsa mafunde omwe angakhudze dongosolo, pamene PVC sangathe.
6. HDPE ndiyoyenera kwambiri kuyika kwapang'onopang'ono, pomwe PVC ndiyoyenera kuyikidwa m'manda mwachindunji ndi kuyika ngalande.