Thaum nrhiav cov cables zoo tshaj plaws thiab cov xov hlau, xaiv cov khoom siv sheathing yog qhov tseem ceeb heev. Lub sab nrauv sheath muaj ntau yam kev ua haujlwm los xyuas kom meej qhov ua haujlwm ntev, kev nyab xeeb thiab kev ua haujlwm ntawm lub cable lossis xaim. Nws tsis yog ib qho uas yuav tsum tau txiav txim siab ntawm polyurethane (PUR) thiabPolyvinyl chloride (PVC). Hauv tsab xov xwm no, koj yuav kawm txog qhov sib txawv ntawm kev ua haujlwm ntawm ob cov ntaub ntawv thiab cov ntawv thov uas txhua yam khoom siv tau zoo tshaj plaws.
Sheathing qauv thiab ua haujlwm hauv cables thiab xov hlau
Lub sheath (tseem hu ua lub tsho sab nrauv los yog sheath) yog txheej txheej sab nraud ntawm cov hlua los yog hlau thiab yog siv los siv ib qho ntawm ntau txoj kev extrusion. Lub sheath tiv thaiv cov cable conductors thiab lwm yam structural Cheebtsam los ntawm lwm yam xws li tshav kub, txias, ntub dej los yog tshuaj thiab mechanical influences. Nws kuj tseem tuaj yeem kho cov duab thiab daim ntawv ntawm tus neeg xyuas pib stranded, nrog rau cov txheej txheem tiv thaiv (yog tias tam sim no), yog li txo qis kev cuam tshuam nrog cable lub electromagnetic compatibility (EMC). Qhov no yog ib qho tseem ceeb kom ntseeg tau tias kev sib kis ntawm lub zog, teeb liab, lossis cov ntaub ntawv nyob rau hauv lub cable lossis xaim. Sheathing tseem ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm cov cables thiab cov xov hlau.
Xaiv cov khoom siv sheathing yog qhov tseem ceeb rau kev txiav txim siab qhov zoo tshaj plaws cable rau txhua daim ntawv thov. Yog li ntawd, nws yog ib qho tseem ceeb kom paub meej tias lub hom phiaj ntawm lub cable lossis xaim yuav tsum ua haujlwm li cas thiab seb nws yuav tsum ua li cas.
Cov khoom siv sheathing tshaj plaws
Polyurethane (PUR) thiab polyvinyl chloride (PVC) yog ob feem ntau siv sheathing ntaub ntawv rau cables thiab xov hlau. Pom tau, tsis muaj qhov sib txawv ntawm cov ntaub ntawv no, tab sis lawv nthuav tawm cov khoom sib txawv uas ua rau lawv tsim nyog rau kev siv sib txawv. Tsis tas li ntawd, ob peb lwm cov ntaub ntawv tuaj yeem siv los ua cov ntaub ntawv sheathing, suav nrog cov roj hmab ua lag luam, thermoplastic elastomers (TPE), thiab cov khoom siv tshwj xeeb yas. Txawm li cas los xij, vim tias lawv muaj tsawg dua li PUR thiab PVC, peb tsuas yog muab piv rau ob qho no yav tom ntej.
PUR - Qhov tseem ceeb tshaj plaws
Polyurethane (los yog PUR) yog hais txog ib pawg ntawm cov yas tsim thaum xyoo 1930s. Nws yog tsim los ntawm cov txheej txheem tshuaj hu ua ntxiv polymerization. Cov khoom siv raw feem ntau yog roj av, tab sis cov khoom siv cog xws li qos yaj ywm, pob kws lossis qab zib beets tuaj yeem siv rau hauv nws cov khoom. Polyurethane yog ib qho thermoplastic elastomer. Qhov no txhais tau hais tias lawv hloov tau thaum cua sov, tab sis tuaj yeem rov qab mus rau lawv qhov qub qub thaum rhuab.
Polyurethane muaj cov cuab yeej zoo tshwj xeeb. Cov khoom siv tau zoo heev hnav tsis kam, txiav tsis kam thiab tsim kua muag, thiab tseem hloov tau yooj yim txawm tias qhov kub thiab txias. Qhov no ua rau PUR tshwj xeeb tshaj yog tsim rau cov ntawv thov uas xav tau kev txav mus los thiab kev khoov, xws li cov hlua txuas. Hauv kev siv neeg hlau, cables nrog PUR sheathing tuaj yeem tiv taus ntau lab lub voj voog khoov lossis muaj zog torsional tsis muaj teeb meem. PUR kuj tseem muaj zog tiv thaiv roj, kuab tshuaj thiab hluav taws xob ultraviolet. Tsis tas li ntawd, nyob ntawm qhov muaj pes tsawg leeg ntawm cov khoom siv, nws yog halogen-dawb thiab nplaim hluav taws, uas yog cov txheej txheem tseem ceeb rau cov cables uas tau lees paub UL thiab siv hauv Tebchaws Meskas. PUR cables feem ntau siv rau hauv tshuab thiab Hoobkas tsim, kev lag luam automation, thiab kev lag luam tsheb.
PVC - qhov tseem ceeb tshaj plaws feature
Polyvinyl chloride (PVC) yog cov yas uas tau siv los ua cov khoom sib txawv txij li xyoo 1920s. Nws yog cov khoom ntawm cov roj saw polymerization ntawm vinyl chloride. Nyob rau hauv sib piv rau elastomer PUR, PVC yog ib tug thermoplastic polymer. Yog hais tias cov khoom yog deformed nyob rau hauv lub cua sov, nws yuav tsis tau rov qab mus rau nws qub lub xeev.
Raws li cov ntaub ntawv sheathing, polyvinyl chloride muaj ntau txoj hauv kev vim nws muaj peev xwm hloov tau rau cov kev xav tau sib txawv los ntawm kev hloov nws qhov sib piv. Nws lub peev xwm thauj khoom txhua yam tsis yog siab npaum li PUR, tab sis PVC kuj tseem pheej yig dua; Tus nqi nruab nrab ntawm polyurethane yog plaub zaug siab dua. Tsis tas li ntawd, PVC tsis muaj ntxhiab tsw thiab tiv taus dej, kua qaub thiab tshuaj ntxuav. Nws yog vim li no nws feem ntau siv hauv kev lag luam khoom noj lossis hauv qhov chaw ntub dej. Txawm li cas los xij, PVC tsis yog halogen-dawb, yog vim li cas nws thiaj suav tias tsis tsim nyog rau kev siv sab hauv tsev. Tsis tas li ntawd, nws tsis yog cov roj resistant, tab sis cov cuab yeej no tuaj yeem ua tiav los ntawm cov tshuaj ntxiv tshwj xeeb.
Xaus
Ob leeg polyurethane thiab polyvinyl chloride muaj lawv qhov zoo thiab qhov tsis zoo li cov ntaub ntawv cable thiab hlau sheathing. Tsis muaj lus teb meej rau cov ntaub ntawv twg yog qhov zoo tshaj plaws rau txhua daim ntawv thov tshwj xeeb; Ntau yam nyob ntawm tus kheej xav tau ntawm daim ntawv thov. Qee zaum, cov ntaub ntawv sheathing sib txawv kiag li yuav yog ib qho kev daws teeb meem zoo tshaj plaws. Yog li ntawd, peb txhawb kom cov neeg siv nrhiav kev tawm tswv yim los ntawm cov kws tshaj lij uas paub txog qhov zoo thiab qhov tsis zoo ntawm cov khoom sib txawv thiab tuaj yeem hnyav ib leeg.
Post lub sij hawm: Nov-20-2024