Mapaipi a polypropylene (PP mapaipi) amagwiritsidwa ntchito kwambiri popereka madzi ndi ngalande, HVAC, ndi mafakitale amafuta chifukwa cha kukana kwa dzimbiri, kukana kutentha kwambiri, komanso moyo wautali. Komabe, kuyika kapena kukonza molakwika kungayambitse kutayikira, kupindika, kapena kulephera kwadongosolo. Njira zazikuluzikulu zotsatirazi, kuyambira pakusankhidwa ndi kukhazikitsa mpaka kukonza, zidzakuthandizani kugwiritsa ntchito mapaipi a polypropylene bwino.
Kusankha: Kufananiza Zochitika Ndikofunikira
Mapaipi a polypropylene amagawidwa ndi zinthu kukhala homopolymer PP (monga PP-H) ndi copolymer PP (monga PP-B ndi PP-R). PP-R (mwachisawawa copolymer polypropylene) imakhala ndi ntchito yabwino kwambiri yonse, yosasunthika kutentha kwambiri (kwautali-kutentha kogwira ntchito kwanthawi yayitali mpaka madigiri 70 ) komanso kukana kukhudzidwa kwambiri, kumapangitsa kuti ikhale yoyenera mapaipi amadzi otentha am'nyumba ndi makina a HVAC; PP- B imakhala ndi mphamvu yolimba koma yofooka pang'ono kutentha kwapamwamba, ndipo imagwiritsidwa ntchito kwambiri pamapaipi amadzi ozizira; PP-H imakhala yosasunthika koma yosasinthika bwino, ndipo imagwiritsidwa ntchito ngati dzimbiri la mafakitale-pamayendedwe olimbana ndi madzimadzi. Posankha chitoliro, m'pofunika kutchula sing'anga (madzi/mankhwala), kutentha (kwautali-kutentha kwambiri kwanthawi yayitali), ndi kutsika kwamphamvu (kawirikawiri PN1.0-2.5MPa) kupeŵa kusakwanira makina.
Kuyika: Tsatanetsatane Dziwani Kupambana kapena Kulephera
1. Pre-mankhwala ndi Kudula
Musanakhazikitse, yeretsani mapaipi ndi mfundo za mafuta ndi ma burrs kuti muwonetsetse kuti pamakhala malo osalala. Podula, tikulimbikitsidwa kugwiritsa ntchito chodulira chitoliro cha PP kapena chocheka bwino-chamano. Kudulidwa kuyenera kukhala koyima ndi kosalala (kupotoka Kuchepera kapena kofanana ndi digiri ya 0.5), apo ayi zidzakhudza chisindikizo cha weld. Ngati chodulidwacho sichikufanana, chikhoza kusinthidwa ndi fayilo kapena sandpaper.
2. Njira yowotcherera (Hot Fusion Connection ngati Core)
Mapaipi a PP amalumikizidwa makamaka ndi kuphatikizika kotentha (mtundu wa socket). Zofunikira kwambiri ndi kutentha ndi nthawi: Kutentha kwa kutentha kwa PP-mapaipi a R nthawi zambiri amakhala madigiri 260±10 (osiyana pang'ono ndi mitundu yosiyanasiyana; onetsani buku la malangizo). Panthawi yogwira ntchito:
• Choyamba, ikani zonse zokwana ndi chitoliro mu makina ophatikizira kutentha mpaka kuya kwake komwe kwatchulidwa (monga pafupifupi 14mm kwa chitoliro cha Φ20mm), kutenthetsa kwa masekondi 5-7 (otalikirapo ma diameter okulirapo);
• Mutangotenthetsa, ikani chitoliro mu choyenerera pa liwiro lofananira mpaka kukuya kwa chizindikiro (osazungulira!), Sungani kupanikizika kwa masekondi 2-3 mpaka kuziziritsa (nthawi yozizira ndi pafupifupi 30-60 masekondi, panthawi yomwe kusuntha kumaletsedwa);
• Ngati "mipata" kapena "mipata" ionekera pambuyo kuwotcherera, zimasonyeza kutenthedwa kapena kulowetsa kosakwanira, zomwe zimafuna kuchekedwa ndi kuwotchereranso-.
3. Zothandizira ndi Kutalikirana
Mipope iyenera kukhazikitsidwa ndi zothandizira pulasitiki zodzipatulira (musalole kukhudzana mwachindunji ndi zitsulo zothandizira kupewa kuwonongeka kwa electrochemical). Kwa mipope yopingasa, ikani chothandizira chimodzi pamamita 2-3 aliwonse; kwa mipope yoyimirira, malo amodzi okhazikika pansi. Pa mapindikidwe (mwachitsanzo, zigongono za digirii 90), zothandizira zowonjezera ziyenera kuyikidwa mkati mwa 200mm mbali zonse kuteteza kupsinjika ndi kusweka kwa mafupa.
4. Kuganizira Mwapadera pa Zochitika Zina
• Mapaipi Oonekera: Ndibwino kuti muyike chotchinga chotchinga (monga rabala-siponji ya pulasitiki) kuti mupewe kuwala kwa dzuwa komwe kumafulumizitsa kukalamba (ma UV amatha kupangitsa kuti chitoliro cha PP chikhale cholimba);
• Mipope Yokwiriridwa: Pansi pa ngalande ya chitoliro iyenera kuphatikizika ndikukutidwa ndi mchenga wabwino kwambiri (kukhuthala Kuposa kapena kofanana ndi 100mm). Mukabwezeretsanso, choyamba mudzaze ndi dothi lofewa ndikuliphatikiza pang'onopang'ono kuti mupewe zinthu zolimba zomwe zingawononge chitoliro;
• Kulumikizana ndi Zitsulo Zachitsulo: Zolumikizira zosinthira (monga PP-R flanges + ma bolts achitsulo chosapanga dzimbiri) zimafunika kuti zisawononge dzimbiri.
Kusamalira: Chinsinsi Chokulitsa Moyo Wautali
1. Kuyanika kwatsiku ndi tsiku: Yang'anani papaipi pafupipafupi ngati ming'alu, kupindika, kapena madontho amadzi (makamaka m'malo olumikizirana mafupa), ndipo mverani ngati madzi akutuluka molakwika (omwe angasonyeze kutulutsa pang'ono). M'malo otsika-kutentha kwambiri m'nyengo yozizira (osachepera madigiri 5 ), tsitsani madzi aliwonse omwe asonkhanitsidwa m'mapaipi kapena amangireni zinthu zoziziritsa kukhosi kuti mapaipi a PP asamaphwanyeke komanso kung'ambika pakatentha pang'ono.
2. Kuyeretsa ndi Kuletsa-Kutseka: Pewani kuthira mafuta kapena mankhwala (monga ma asidi amphamvu/ma alkali) mu mapaipi. Mukagwiritsa ntchito-kwanthawi yayitali, gwiritsani ntchito 5% citric acid solution poyeretsa mozungulira (kutentha kwa madzi Kusakwana kapena kofanana ndi madigirii 60 ) kuchotsa sikelo. Ngati kutsekeka kwatsekeka, gwiritsani ntchito chotsukira poyeretsa kaye; osagwiritsa ntchito chitsulo chachitsulo kukwapula (idzakanda khoma lamkati).
3. Chithandizo cha Ukalamba Pogwiritsa ntchito bwino, mapaipi a PP amatha zaka 50. Komabe, ngati ayamba kupunduka, osintha mtundu (mwachitsanzo, achikasu), kapena akudontha pafupipafupi pamfundo zolumikizira mafupawo, ndi bwino kuzisintha pang'ono m'malo mozikonza (kukonzanso kuphatikizika kwa kutentha kungakhudze mphamvu yonse).
Kudziwa bwino njirazi kudzalola kuti mapaipi a polypropylene angowonjezera ubwino wawo wokana dzimbiri komanso moyo wautali komanso kupewa mavuto omwe amapezeka kawirikawiri, zomwe zimapangitsa kuti mapaipi azikhala otetezeka komanso odalirika.
