Stretch zaj duab xis yog dav siv hauv kev lag luam ntim khoom, tab sis muaj qhov sib txawv tseem ceeb ntawm ntau hom kev xaiv thaum xaiv. Cov kev sib txawv no yog nyob rau hauv cov khoom siv raw, cov yam ntxwv ntawm kev ua tau zoo, thiab kev siv cov xwm txheej. Kev nkag siab txog qhov sib txawv no pab nrhiav qhov sib npaug ntawm tus nqi thiab kev ua tau zoo.
Los ntawm qhov kev xav ntawm cov khoom siv raw thiab cov txheej txheem tsim khoom, cov yeeb yaj kiab ncab feem ntau muab faib ua ob pawg: linear low-density polyethylene (LDPE) zaj duab xis thiab siab -density polyethylene (HDPE) zaj duab xis. Kuj tseem muaj kev sib xyaw lossis metallocene- hloov kho ntau yam. LDPE zaj duab xis muaj qhov hloov tau yooj yim thiab elongation, thiab kev ua haujlwm zoo, ua rau nws tsim nyog rau cov khoom uas yuav tsum tau kaw nruj nreem thiab tuav tsis tu ncua. HDPE zaj duab xis yog nruj dua thiab puncture-tiv taus, ua rau nws tsim nyog rau kev tiv thaiv cov khoom tsis zoo li qub lossis cov duab angular. Cov yeeb yaj kiab hloov kho tau ua kom zoo ntxiv rau hauv cov ntsiab lus ntawm qhov tawv, pob tshab, thiab qhov kub thiab txias, ua rau lawv tiv taus ntau qhov chaw.
Raws li kev siv, feem ntau hom yog tes- ua haujlwm ncab zaj duab xis thiab tshuab- ua haujlwm ncab zaj duab xis. Tes- tuav stretch films feem ntau yog ntau tshaj 20 micrometers tuab, nrog rau nruab nrab stretchability, tso cai rau cov neeg ua hauj lwm kom yooj yim tswj lub zog siv thiab txo qhov kev pheej hmoo ntawm kev tawg. Lawv tsim nyog rau me me -batch, tsis yog- ntim khoom. Tshuab- tuav cov yeeb yaj kiab yog nyias dua thiab muaj qhov sib piv ntau dua, ua kom muaj siab- nrawm nrawm nrawm thaum siv nrog cov tshuab rub tawm, txhim kho kev ua tau zoo hauv loj- cov chaw khaws khoom thiab kev xa khoom. Qhov dav thiab yob ntev kuj txawv; tshuab- tuav cov yeeb yaj kiab feem ntau nqaim dua thiab ntev dua los txo cov yob hloov zaus.
Qhov sib txawv ntawm kev tsom xam ua haujlwm kuj tseem ceeb heev. Cov yeeb yaj kiab ncab ib txwm hais txog kev lag luam thiab kev ua tau zoo, ua tau raws li qhov yooj yim plua plav, ya raws - pov thawj, thiab kev ruaj ntseg. Cov yeeb yaj kiab ua ntej -stretch films muaj qhov ua ntej- siv qhov nro thaum tsim khoom, txo qhov chaw ncab thaum siv, yog li txo kev siv thiab cov nqi siv tau. Antistatic stretch films muaj qhov tshwj xeeb kho qhov chaw kom tsis txhob muaj hluav taws xob zoo li qub thaum ntim cov khoom siv hluav taws xob. UV-cov yeeb yaj kiab tiv taus muaj cov stabilizers, ua rau lawv haum rau kev cia sab nraum zoov lossis kev thauj mus los ntev -, ncua kev laus thiab embrittlement.
Qhov sib txawv ntawm adhesiveness thiab peelability cuam tshuam rau cov neeg siv kev paub. Qee cov yeeb yaj kiab muaj zog pib tack, ruaj khov thaum qhwv, ua rau lawv haum rau ntev - thauj mus los; lwm tus yog tshem tau, nrog me ntsis adhesion, tsis muaj residue thaum tshem tawm, haum rau luv luv - lub sij hawm exhibitions los yog cov khoom siv. Tseem muaj lwm tus muaj tus kheej nruab nrab- adhesion ntawm cov khaubncaws sab nraud povtseg, ntsuas qhov ruaj khov thiab yooj yim ntawm kev tshem tawm, feem ntau siv rau kev kho ib ntus ntawm cov txheej txheem ntau lawm.
Txawm hais tias qhov sib txawv ntawm qhov tsos thiab xim tsis cuam tshuam rau kev ua haujlwm tseem ceeb, lawv muaj feem xyuam nrog kev txheeb xyuas thiab kev siv cov xwm txheej. Cov yeeb yaj kiab pob tshab pab saib cov ntsiab lus thiab feem ntau siv hauv kev txheeb xyuas thiab kev soj ntsuam zoo; cov yeeb yaj kiab dawb lossis xim dawb tuaj yeem ua rau pom kev tsis pom kev, txhim kho kev ntim khoom zoo nkauj lossis tiv thaiv kev ceev ntiag tug, thiab feem ntau yog siv hauv kev ntim khoom rau cov khoom lag luam.
Zuag qhia tag nrho, stretch films txawv nyob rau hauv cov yam ntxwv ntawm raw cov ntaub ntawv, siv txoj kev, kev ua tau zoo, adhesion, thiab tsos. Kev nkag siab txog qhov sib txawv no tso cai rau kev xaiv cov hom tsim nyog tshaj plaws raws li cov khoom tsim, ib puag ncig kev ua haujlwm, thiab cov hom phiaj tswj tus nqi, kom ntseeg tau tias ntim khoom yog ob qho tib si txhim khu kev qha thiab kev lag luam.
