Polypropylene yamitundu itatu, kapena copolymer yosasinthikachitoliro cha polypropylene, amatchedwa ndi chidule cha PPR. Zipangizozi zimagwiritsa ntchito heat welding, zili ndi zida zapadera zowotcherera ndi kudula, ndipo zimakhala ndi pulasitiki wambiri. Mtengo wake ndi wabwino kwambiri. Pamene chotetezera kutentha chikuwonjezeredwa, mphamvu ya insulation imakula bwino ndipo khoma la mapaipi, kupatulapo malo olumikizirana pakati pa mawaya amkati ndi akunja, limakhala losalala kwambiri.

Kawirikawiri imagwiritsidwa ntchito m'mapaipi omwe aikidwa kale m'zitsime zakuya kapena makoma ophimbidwa.Chitoliro cha PPRIli ndi moyo wogwira ntchito wa zaka 50, ndi yokwera mtengo, yokhazikika pakugwira ntchito, yolimba pa kutentha komanso yosunga kutentha, yolimba pa dzimbiri, yosalala komanso yosakulira pakhoma lamkati, yotetezeka komanso yodalirika mu dongosolo la mapaipi. Kuti titsimikizire chitetezo cha dongosololi, zida zapamwamba ndi antchito oyenerera amafunika pomanga, zomwe zili ndi zofunikira paukadaulo wapamwamba.

Mitundu yofewa komanso yofanana—m'malo mwa mitundu yosiyanasiyana yomwe imapezeka m'mapaipi ena amadzi—imaperekaChitoliro cha madzi cha PP-Rmtundu ndi mawonekedwe okongola. (Ogula nthawi zambiri amaganiza kuti mtundu woyera ndiye wabwino kwambiri pa mapaipi a PP-R, koma mtundu siwofunikira poyesa ubwino; mtundu wa mapaipi amadzi a PP-R ndi wosiyana ndi wa mapaipi a PP-R, ndipo mtundu wa paipi yamadzi sugwirizana ndi izi (palinso mitundu ina yomwe yawonjezedwa ndi masterbatch yamtundu). Mtundu uliwonse ukhoza kupangidwa bola ngati masterbatch yamtundu ilipo, ndipo sizingawononge kapena kukhudza mtundu wa PP. Chifukwa chake, ma R ndi osafunikira mtundu wa paipi yamadzi.

Kawirikawiri, zinthu zopangira za PP-R zokha ndi zomwe zingagwiritsidwe ntchito popanga zinthu zoyera. Mwachitsanzo, pomwe zinthu zina zamitundu zomwe zimakonzedwa ndi mitundu ya masterbatches zimaphatikizidwa ndi zinthu zobwezerezedwanso, zinthu zotayidwa, ndi zinthu zamakona, mtundu wa zinthu zopangidwa powonjezera zinthu zobwezerezedwanso, zinthu zotayidwa, ndi zinthu zamakona si wofewa komanso wosagwirizana. Mtundu wa chinthucho sudzakhudzidwa ndi zinthu zomwe zagwiritsidwa ntchito, ndi zina zotero. Malo amkati ndi akunja a chinthucho ayenera kukhala opanda cholakwa komanso osalala; zolakwika monga thovu la mpweya, malo owonekera bwino, mitsinje, ndi zodetsa siziloledwa.

Zipangizo zonse zofunika kwambiri pa mapaipi abwino amadzi a PP-R ndi PP-R. (opanda zowonjezera). Mawonekedwe oyera, okhala ndi malo osalala komanso chogwirira chomasuka. Mapaipi oyerekeza a PP-R amamveka ofewa. Kawirikawiri, tinthu tosakhazikika timakhala ndi zinthu zosafunika; polypropylene ndiye gawo lalikulu la mapaipi a PP-R. Mapaipi oipa amanunkha modabwitsa, pomwe mapaipi abwino samanunkha. Nthawi zambiri, polyethylene m'malo mwa polypropylene imaphatikizidwa.

Kutentha kwabwino kwa welding kwa mapaipi a PP-R ndi pakati pa 260 ndi 290°C. Ubwino wa weld udzatsimikizika bwino kutentha kumeneku. Chogulitsacho chingalowe mosavuta mu welding die head panthawi yowelding ngati magawo a welding ndi abwinobwino. Kuphatikiza apo, ma fusion accumulation nodules a chinthucho amakhala ngati madzi, zomwe zikusonyeza kuti sichinapangidwe ndi zinthu zenizeni za PP-R.

Chogulitsachi sichipangidwanso ndi zinthu zenizeni za PP-R ngati timibulu tomwe timasonkhanitsira zinthu zolumikizidwa tingazizire ndikulimba mwachangu (nthawi zambiri mkati mwa masekondi 10). Izi zili choncho chifukwa PP-R imakhala ndi mphamvu yoteteza kutentha kwambiri, zomwe zikutanthauza kuti kuzizira kwake kudzakhala pang'onopang'ono.
Yang'anani ngati zolumikizira za chitoliro zakokedwa ndipo ngati m'mimba mwake wa chitolirocho wasokonekera. M'mimba mwake wa chitoliro chabwino cha PP-R simungathe kukokedwa, ndipo sichipindika mosavuta.