Xa ukhangela ezona ntambo zilungileyo kunye neengcingo, ukukhetha eyona nto ilungileyo yokucheba ibalulekile. I-sheath yangaphandle inemisebenzi eyahlukeneyo yokuqinisekisa ukuqina, ukhuseleko kunye nokusebenza kwentambo okanye ucingo. Akuqhelekanga ukuba wenze isigqibo phakathi kwe-polyurethane (PUR) kunyei-polyvinyl chloride (PVC). Kweli nqaku, uya kufunda malunga nomahluko wokusebenza phakathi kwezinto ezimbini kunye nezicelo ezona zifaneleke kakhulu imathiriyeli nganye.
Ubume be-sheathing kunye nomsebenzi kwiintambo kunye neengcingo
I-sheath (ekwabizwa ngokuba yi-sheath yangaphandle okanye i-sheath) ngumaleko ongaphandle wentambo okanye ucingo kwaye isetyenziswa kusetyenziswa enye yeendlela ezininzi zokukhupha. I-sheath ikhusela abaqhubi bekhebula kunye namanye amacandelo esakhiwo kwizinto zangaphandle ezifana nokushisa, ukubanda, okumanzi okanye iikhemikhali kunye neempembelelo zemishini. Iyakwazi nokulungisa imilo kunye nefom yomqhubi we-stranded, kunye ne-shielding layer (ukuba ikhona), ngaloo ndlela inciphisa ukuphazamiseka kwentambo ye-electromagnetic comppatibility (EMC). Oku kubalulekile ukuqinisekisa ukuhanjiswa kwamandla, umqondiso, okanye idatha ngaphakathi kwentambo okanye ucingo. I-Sheathing nayo idlala indima ebalulekileyo ekomeleleni kweentambo kunye neengcingo.
Ukukhetha i-sheathing efanelekileyo kubalulekile ekuqinisekiseni intambo efanelekileyo kwisicelo ngasinye. Ngoko ke, kubalulekile ukwazi kakuhle ukuba yintoni injongo ikhebula okanye ucingo kufuneka lusebenze kwaye zeziphi iimfuno ekufuneka zihlangabezane nazo.
Eyona nto ixhaphakileyo yokucheba impahla
I-Polyurethane (i-PUR) kunye ne-polyvinyl chloride (i-PVC) zezona zinto ziqhelekileyo zisetyenziselwa ukucheba iintambo kunye neengcingo. Ngokubonakalayo, akukho mahluko phakathi kwezi zixhobo, kodwa zibonisa iipropati ezahlukeneyo ezenza ukuba zilungele izicelo ezahlukeneyo. Ukongeza, ezinye izinto ezininzi zinokusetyenziswa njengezinto zokuthambisa, kubandakanya irabha yorhwebo, i-thermoplastic elastomers (TPE), kunye neekhompawundi zeplastiki ezikhethekileyo. Nangona kunjalo, kuba aziqhelekanga kakhulu kune-PUR kunye ne-PVC, siya kuthelekisa ezi zimbini kuphela kwixesha elizayo.
I-PUR - Eyona nto ibalulekileyo
I-polyurethane (okanye i-PUR) ibhekisela kwiqela leeplastiki eziphuhliswe ekupheleni kwe-1930s. Iveliswa yinkqubo yeekhemikhali ebizwa ngokuba yi-addition polymerization. Izinto ezikrwada zidla ngokuba yi-petroleum, kodwa izinto zezityalo ezifana neitapile, umbona okanye i-sugar beet nazo zingasetyenziswa kwimveliso yayo. I-Polyurethane yi-elastomer ye-thermoplastic. Oku kuthetha ukuba ziyabhetyebhetye xa zishushu, kodwa zinokubuyela kwisimo sazo sakuqala xa zishushu.
I-Polyurethane ineempawu ezintle zoomatshini. Izinto eziphathekayo zinokumelana okugqwesileyo kokunxiba, ukuxhathisa ukusika kunye nokumelana nokukrazula, kwaye zihlala ziguquguquka kakhulu nakwiqondo lokushisa eliphantsi. Oku kwenza i-PUR ilungele ngakumbi izicelo ezifuna intshukumo eguqukayo kunye neemfuno zokugoba, ezinje ngamatyathanga okutsala. Kwizicelo zerobhothi, iintambo ezine-PUR sheathing zinokumelana nezigidi zemijikelo yokugoba okanye imikhosi eyomeleleyo ye-torsional ngaphandle kweengxaki. I-PUR iphinde ibe nokuchasana okunamandla kwioli, i-solvents kunye nemitha ye-ultraviolet. Ukongezelela, kuxhomekeke ekubunjweni kwezinto eziphathekayo, i-halogen-free kunye ne-flame retardant, eziyimilinganiselo ebalulekileyo yeentambo eziqinisekisiweyo ze-UL kwaye zisetyenziswe e-United States. Iintambo zePUR ziqhele ukusetyenziswa kumatshini kunye nokwakhiwa kwefektri, i-automation ye-industrial, kunye neshishini leemoto.
I-PVC - eyona nto ibalulekileyo
I-Polyvinyl chloride (i-PVC) yiplastiki esetyenzisiweyo ukwenza iimveliso ezahlukeneyo ukususela ngo-1920. Yimveliso ye-gas chain polymerization ye-vinyl chloride. Ngokuchaseneyo ne-elastomer PUR, i-PVC yipolymer ye-thermoplastic. Ukuba izinto eziphathekayo zikhubazekile phantsi kokufudumala, azikwazi ukubuyiselwa kwimeko yayo yangaphambili.
Njengesixhobo sokutshiza, i-polyvinyl chloride ibonelela ngeendlela ezahlukeneyo ezinokwenzeka kuba iyakwazi ukuziqhelanisa neemfuno ezahlukeneyo ngokuguqula umyinge wokwakheka kwayo. Umthamo wayo womthwalo womatshini awukho phezulu njenge-PUR, kodwa i-PVC nayo inoqoqosho kakhulu; Ixabiso eliqhelekileyo le-polyurethane liphindwe kane. Ukongeza, i-PVC ayinavumba kwaye iyamelana namanzi, i-asidi kunye neearhente zokucoca. Kungenxa yesi sizathu ukuba isoloko isetyenziswa kwishishini lokutya okanye kwiindawo ezifumileyo. Nangona kunjalo, i-PVC ayikho i-halogen-free, yiyo loo nto ithathwa njengengafanelekanga kwizicelo ezithile zangaphakathi. Ukongeza, ayimelana neoyile ngokwendalo, kodwa le propati inokufezekiswa ngezongezo ezikhethekileyo zeekhemikhali.
Ukuqukumbela
Zombini i-polyurethane kunye ne-polyvinyl chloride zineenzuzo kunye nokungelona kwazo njengekhebula kunye nezixhobo zokushela ucingo. Akukho mpendulo iqinisekileyo ukuba yeyiphi imathiriyeli eyona ilungileyo kwisicelo ngasinye; Okuninzi kuxhomekeke kwiimfuno zomntu ngamnye zesicelo. Kwezinye iimeko, i-sheathing imathiriyeli eyahlukileyo inokuba sisisombululo esifanelekileyo. Ngoko ke, sikhuthaza abasebenzisi ukuba bafune iingcebiso kwiingcali eziqhelana neempawu ezintle nezimbi zezinto ezahlukeneyo kwaye banokulinganisa omnye nomnye.
Ixesha lokuposa: Nov-20-2024