Paipi Yopangidwa ndi Pulasitiki Yolimbikitsidwa ndi Pulasitiki (PU) ndi mapaipi ogwira ntchito bwino kwambiri, opangidwa kuti akwaniritse zofunikira kwambiri zamafakitale, zamalonda, ndi zaulimi. Kapangidwe kake kapakati kamaphatikiza khoma lamkati la PU losalala, losawonongeka ndi pulasitiki yolumikizidwa (kapena waya wachitsulo wopangidwa ndi mkuwa kuti usungunuke), zomwe zimapangitsa kuti pakhale kusinthasintha, mphamvu, komanso kulimba kosayerekezeka.
Choyamba, kapangidwe kake ka zinthu kamatsimikizira kukhala ndi moyo wautali kwambiri: chubu cha PU (chopangidwa ndi polyester) chili ndi kuuma kwa Shore A kwa 95±2, komwe kumapereka kukana kwabwino kwambiri ku kukwawa, kung'ambika, ndi kugwedezeka—kupambana njira zina za rabara kapena PVC ndi nthawi 3-5 m'malo ovuta kwambiri (monga kusamutsa zinthu zopyapyala monga simenti kapena tirigu). Kulimbitsa kwa pulasitiki kumachotsa kufunikira kwa mawaya achitsulo cholemera (pokhapokha ngati kwatchulidwa) pamene kumasunga umphumphu wa kapangidwe kake, kulola payipi kupirira kupsinjika kwabwino mpaka mipiringidzo 10 ndi kupsinjika koipa (kutulutsa) kwa mipiringidzo -0.9, zomwe zimapangitsa kuti ikhale yoyenera kugwiritsidwa ntchito popereka komanso kugwiritsa ntchito zinthu zotsukira.
Chachiwiri, imapereka kusinthasintha kwakukulu kwa chilengedwe: imagwira ntchito modalirika kutentha kuyambira -40°C mpaka 90°C (yokhala ndi kupirira kwakanthawi kochepa mpaka 120°C), imakhalabe yosinthasintha ngakhale kuzizira kwambiri (mosiyana ndi mapayipi olimba a PVC) ndipo imakana kusintha m'malo otentha kwambiri. Kuphatikiza apo, mtundu wa chakudya (wogwirizana ndi miyezo ya EU 10/2011 ndi FDA) uli wopanda ma phthalates, BPA, ndi zitsulo zolemera, zomwe zimapangitsa kuti ikhale yotetezeka kusamutsa zakumwa zodyedwa (madzi amchere, vinyo, mkaka) kapena zosakaniza zouma za chakudya - zofunika kwambiri pokonza chakudya ndi kupanga zakumwa. Pakugwiritsa ntchito m'mafakitale, imakhala yolimba kwambiri ku mafuta, ma acid ofatsa, alkalis, ndi zosungunulira, kupewa kuwonongeka m'malo ovuta kugwira ntchito.
Chachitatu, kapangidwe kake kogwiritsa ntchito kamawonjezera magwiridwe antchito: khoma lamkati losalala kwambiri (Ra < 0.5 μm) limachepetsa kutayika kwa kukangana, kuonetsetsa kuti madzi, ufa, kapena mpweya sizikutsekedwa bwino pamene likuletsa kusonkhanitsa zotsalira (kuchepetsa kuyeretsa ndikuchepetsa ndalama zokonzera). Kapangidwe kopepuka (≈30% kopepuka kuposa mapayipi a rabara a mainchesi ofanana) ndi kapangidwe kozungulira kosagwedezeka kamalola kuyendetsa mosavuta, kupindika, ndi kupindika—koyenera malo opapatiza (monga, mpweya wabwino wa makina, zipinda zamainjini a sitima) kapena ntchito zoyenda (monga, zopopera zaulimi, mapampu a malo omangira). Kukula kosinthika (ma mainchesi amkati: 25mm–300mm; makulidwe a khoma: 0.6mm–2mm) ndi mitundu yosiyanasiyana (yowonekera, yakuda, kapena yopangidwa mwamakonda) imasinthanso malinga ndi zosowa zinazake, kuyambira kusamutsa madzi a labotale ang'onoang'ono kupita ku kunyamula madzi ambiri m'migodi.
Pomaliza, kusinthasintha kwake kumakhudza mafakitale: mu ulimi, imagwira ntchito ngati mizere yothirira kapena mapaipi opopera/kutulutsa madzi; popanga, imagwira ntchito ngati njira zopumira mpweya wa makina opukutira nsalu kapena mapaipi osonkhanitsira fumbi la zida zopukutira zitsulo; pokonza chakudya, imasamutsa zosakaniza pakati pa magawo opangira; ndipo pokumba, imagwira tinthu tating'onoting'ono ta mkuwa. Mitundu yosankha yosakanikirana ndi static (yokhala ndi waya wokhazikika wachitsulo, kukana < 10² ohm/m) imawonjezera chitetezo pakusamutsa zinthu zomwe zitha kuyaka, kuchepetsa chiopsezo cha kutuluka kwa magetsi.
Mwachidule, payipi iyi ikuphatikiza magwiridwe antchito olimba, kutsatira ukhondo, komanso kusinthasintha kwa magwiridwe antchito—kupangitsa kuti ikhale yankho lotsika mtengo komanso lokhalitsa pamavuto osiyanasiyana ogwiritsira ntchito zinthu.