I-polypropylene yeentlobo ezintathu, okanye i-copolymer engacwangciswangaumbhobho we-polypropylene, ibizwa ngesifinyezo se-PPR. Le nto isebenzisa ukuwelda kobushushu, inezixhobo ezizodwa zokuwelda kunye nokusika, kwaye ine-plasticity ephezulu. Ixabiso layo likwafanelekile. Xa kongezwa umaleko wokugquma, ukusebenza kokugquma kuyaphucuka kwaye udonga lombhobho, ngaphandle kweendawo ezidibana phakathi kweengcingo zangaphakathi nezangaphandle, nalo lugudile kakhulu.

Idla ngokusetyenziswa kwiipayipi ezingcwatywe kwangaphambili kwimingxuma enzulu okanye eludongeni olufakwe ngaphakathi.Umbhobho we-PPRinobomi benkonzo obufikelela kwiminyaka engama-50, ixabiso layo lifanelekile, izinzile ekusebenzeni, ayitshisi ubushushu kwaye igcina ubushushu, ayitshisi umhlwa, igudileyo kwaye ayikhuli eludongeni olungaphakathi, ikhuselekile kwaye ithembekile kwinkqubo yemibhobho. Ukuqinisekisa ukhuseleko lwenkqubo, kufuneka izixhobo ezikumgangatho ophezulu kunye nabasebenzi abafanelekileyo ekwakheni, okuneemfuno zobuchwepheshe obuphezulu.

Imibala ethambileyo nefanayo—kunokuba ibe yeyahlukileyo efumaneka kweminye imibhobho yamanzi—inikaUmbhobho wamanzi we-PP-Rumbala onomtsalane. (Abathengi badla ngokucinga ukuba umbala omhlophe ngowona mbala ulungileyo kwiipayipi ze-PP-R, kodwa umbala awungowomgangatho wokugweba umgangatho; umgangatho weepayipi zamanzi ze-PP-R wahlukile koweepayipi ze-PP-R, kwaye umbala wombhobho wamanzi awunanto yakwenza nawo (kukwakho neminye imibala eyongeziweyo nge-masterbatch yombala). Nawuphi na umbala ungenziwa logama nje i-masterbatch yombala ikhona, kwaye ayiyi kuthoba okanye ichaphazele umgangatho we-PP. Ngoko ke, ii-R azinamsebenzi ukuba umbala wombhobho wamanzi unjani.

Ngokubanzi, zizinto eziluhlaza ze-PP-R kuphela ezinokusetyenziselwa ukwenza iimpahla ezimhlophe. Umzekelo, ngelixa ezinye iimveliso zombala ezicutshungulwe ngemibala ye-masterbatches zidityaniswe nezinto ezisetyenzisiweyo, izinto ezilahliweyo, kunye nezinto zekona, umbala weemveliso ezenziwe ngokongeza izinto ezisetyenzisiweyo, izinto ezilahliweyo, kunye nezinto zekona awuthambile kwaye awulingani. Umbala wemveliso awuyi kuchaphazeleka zizinto ezisetyenzisiweyo, njl. Umphezulu wangaphakathi nowangaphandle wemveliso kufuneka ungabi nasiphako kwaye uthe tyaba; iziphene ezifana namaqamza omoya, iindawo ezikhanyayo, imingxunya, kunye nezinto ezingcolisayo azamkelekanga.

Zonke izinto ezisisiseko zemibhobho yamanzi yePP-R elungileyo yiPP-R. (ayinazo naziphi na izongezo). Ibonakala icocekile, inomphezulu ogudileyo kunye nesiphatho esikhululekileyo. Imibhobho yePP-R yokulinganisa ivakala ithambile. Ngokubanzi, amasuntswana arhabaxa anokuba nokungcola; ipolypropylene yeyona nto iphambili kwimibhobho yePP-R. Imibhobho emibi ayinuki ngendlela engaqhelekanga, ngelixa imibhobho emihle ingenalo. Ngokwesiqhelo, i-polyethylene endaweni yepolypropylene iyadityaniswa.

Ubushushu obuqhelekileyo bokuwelda kwimibhobho ye-PP-R buphakathi kwama-260 nama-290°C. Umgangatho we-weld uya kuqinisekiswa ngcono kula maqondo obushushu. Imveliso ingangena lula entloko ye-welding die ngexesha lokuwelda ukuba iiparameter zokuwelda ziqhelekile. Ukongeza, amaqhuqhuva okuqokelelwa kwemveliso aphantse abe lulwelo, nto leyo ebonisa ukuba ayenziwanga ngezinto zokwenyani ze-PP-R.

Le mveliso ayenziwanga ngezinto zokwenyani ze-PP-R ukuba amaqhuqhuva okuqokelelwa kwe-welding anokupholisa aze aqine ngokukhawuleza (ngesiqhelo kwimizuzwana eli-10). Oku kungenxa yokuba i-PP-R inefuthe elinamandla lokugcina ubushushu, nto leyo ethetha ukuba izinga layo lokuphola liya kuba licotha ngokwemvelo.
Jonga ukuba izixhobo zombhobho zitsaliwe na kwaye ukuba ububanzi bangaphakathi bombhobho bugoso. Ububanzi bangaphakathi bombhobho we-PP-R olungileyo abunakutsalwa, kwaye abugobi lula.