Uma ufuna izintambo ezingcono kakhulu nezintambo, kubalulekile ukukhetha i-sheathing material efanele. I-sheath yangaphandle inemisebenzi ehlukahlukene yokuqinisekisa ukuqina, ukuphepha nokusebenza kwekhebula noma ucingo. Akuvamile ukuthi unqume phakathi kwe-polyurethane (PUR) kanyei-polyvinyl chloride (PVC). Kulesi sihloko, uzofunda mayelana nomehluko wokusebenza phakathi kwezinto ezimbili kanye nezinhlelo zokusebenza ezifaneleke kangcono into ngayinye.
Ukwakheka kwe-sheathing kanye nomsebenzi kuzintambo nezintambo
I-sheath (ebuye ibizwe ngokuthi i-outer sheath noma i-sheath) ungqimba olungaphandle kakhulu lwekhebula noma ucingo futhi lusetshenziswa kusetshenziswa enye yezindlela ezimbalwa zokukhipha. I-sheath ivikela ama-conductors nezinye izakhi zesakhiwo ezintweni zangaphandle ezifana nokushisa, ukubanda, okumanzi noma amathonya amakhemikhali kanye nemishini. Ingase futhi ilungise umumo kanye nesimo se-conductor eboshiwe, kanye nongqimba oluvikelayo (uma lukhona), ngaleyo ndlela kuncishiswe ukuphazamiseka kokuhambisana kwentambo kagesi kagesi (EMC). Lokhu kubalulekile ukuze kuqinisekiswe ukudluliswa kwamandla okungaguquki, isignali, noma idatha ngaphakathi kwekhebula noma intambo. I-sheathing nayo idlala indima ebalulekile ekuqineni kwezintambo nezintambo.
Ukukhetha i-sheathing impahla efanele kubalulekile ekunqumeni ikhebula elingcono kakhulu lohlelo ngalunye. Ngakho-ke, kubalulekile ukwazi kahle ukuthi iyiphi injongo ikhebula noma ucingo okufanele lusebenze futhi yiziphi izidingo okufanele ihlangabezane nazo.
Okuvame kakhulu sheathing impahla
I-Polyurethane (PUR) ne-polyvinyl chloride (PVC) yizinto ezimbili ezivame ukusetshenziswa kakhulu zokushela izintambo nezintambo. Ngokubukeka, akukho mehluko phakathi kwalezi zinto, kodwa zibonisa izakhiwo ezihlukile ezizenza zifanelekele izinhlelo zokusebenza ezahlukene. Ngaphezu kwalokho, ezinye izinto ezimbalwa zingasetshenziswa njengezinto zokushelela, okuhlanganisa irabha yokuhweba, ama-thermoplastic elastomers (TPE), kanye nezinhlanganisela zepulasitiki ezikhethekile. Kodwa-ke, njengoba zingavamile kakhulu kune-PUR ne-PVC, sizoqhathanisa lezi ezimbili kuphela esikhathini esizayo.
I-PUR - Isici esibaluleke kakhulu
I-polyurethane (noma i-PUR) ibhekisela eqenjini lamapulasitiki akhiwa ngasekupheleni kwawo-1930. Ikhiqizwa inqubo yamakhemikhali ebizwa ngokuthi i-polymerization eyengeziwe. Impahla eluhlaza ngokuvamile i-petroleum, kodwa izinto zokutshala ezifana namazambane, ummbila noma ama-beet ashukela nawo angasetshenziswa ekukhiqizeni kwawo. I-Polyurethane iyi-elastomer ye-thermoplastic. Lokhu kusho ukuthi ziyavumelana nezimo lapho zishiselwa, kodwa zingabuyela esimweni sazo sangempela lapho kushisa.
I-Polyurethane inezakhiwo ezinhle kakhulu zemishini. Impahla inokumelana okuhle kakhulu kokugqoka, ukumelana nokusika kanye nokumelana nezinyembezi, futhi ihlala iguquguquka kakhulu ngisho namazinga okushisa aphansi. Lokhu kwenza i-PUR ifaneleke ikakhulukazi izinhlelo zokusebenza ezidinga izidingo zokunyakaza okuguquguqukayo nokugoba, njengamaketanga okudonsa. Ezinhlelweni zerobhothi, izintambo ezine-PUR sheathing zingamelana nezigidi zemijikelezo egobayo noma amandla aqinile okuzungeza ngaphandle kwezinkinga. I-PUR futhi inokumelana okuqinile nowoyela, ama-solvents kanye nemisebe ye-ultraviolet. Ukwengeza, kuye ngokwakhiwa kwempahla, ayinayo i-halogen futhi i-flame retardant, okuyimibandela ebalulekile yamakhebuli aqinisekiswe yi-UL futhi asetshenziswa e-United States. Izintambo ze-PUR zivame ukusetshenziswa ekwakhiweni kwemishini nefekthri, ezishintshayo zezimboni, nasembonini yezimoto.
I-PVC - isici esibaluleke kakhulu
I-Polyvinyl chloride (PVC) iyipulasitiki ebisetshenziswa ukwenza imikhiqizo ehlukene kusukela ngeminyaka yawo-1920. Kungumkhiqizo we-gas chain polymerization ye-vinyl chloride. Ngokungafani ne-elastomer PUR, i-PVC iyi-polymer ye-thermoplastic. Uma into ikhubazekile ngaphansi kokushisisa, ayikwazi ukubuyiselwa esimweni sayo sokuqala.
Njengempahla yokushelela, i-polyvinyl chloride inikezela ngamathuba ahlukahlukene ngoba iyakwazi ukuzivumelanisa nezidingo ezahlukahlukene ngokushintsha isilinganiso sayo sokubunjwa. Umthamo wayo wokulayisha wemishini awuphezulu njenge-PUR, kodwa i-PVC nayo iyonga kakhulu; Intengo ejwayelekile ye-polyurethane iphindwe kane. Ngaphezu kwalokho, i-PVC ayinaphunga futhi imelana namanzi, i-asidi kanye nama-ejenti okuhlanza. Kungenxa yalesi sizathu ukuthi ngokuvamile isetshenziswa embonini yokudla noma ezindaweni ezinomswakama. Kodwa-ke, i-PVC ayinayo i-halogen, yingakho ibhekwa njengengafanele izinhlelo zokusebenza ezithile zasendlini. Ngaphezu kwalokho, akumelani namafutha ngokwemvelo, kodwa le ndawo ingatholakala ngezithasiselo ezikhethekile zamakhemikhali.
Isiphetho
Kokubili i-polyurethane ne-polyvinyl chloride inezinzuzo zayo kanye nokubi njengekhebula nezinto zokushelela ngocingo. Ayikho impendulo eqondile yokuthi iyiphi impahla elungele isicelo ngasinye; Okuningi kuncike ezidingweni zomuntu ngamunye zesicelo. Kwezinye izimo, i-sheathing material ehluke ngokuphelele ingaba isisombululo esihle kakhulu. Ngakho-ke, sikhuthaza abasebenzisi ukuthi bafune iseluleko kochwepheshe abajwayele izici ezinhle nezingezinhle zezinto ezihlukahlukene futhi abakwazi ukukalana.
Isikhathi sokuthumela: Nov-20-2024