Zaj duab xis polypropylene (BOPP) uas tig ob sab yog ib hom zaj duab xis ntim khoom uas yoog tau. Zaj duab xis polypropylene uas tig ob sab yog ncab mus rau sab nraud hauv tshuab thiab sab nraud. Qhov no ua rau muaj kev taw qhia molecular saw hauv ob qho kev taw qhia.
Hom zaj duab xis ntim khoom no yog tsim los ntawm cov txheej txheem tsim khoom tubular. Lub npuas zaj duab xis zoo li lub raj raug inflated thiab cua sov mus rau nws qhov softening point (qhov no txawv ntawm qhov melting point) thiab raug ncab nrog tshuab. Zaj duab xis ncab ntawm 300% - 400%.
Los yog, zaj duab xis kuj tseem tuaj yeem ncab los ntawm cov txheej txheem hu ua tenter-frame film manufacturing. Nrog cov txheej txheem no, cov polymers raug extruded rau ntawm lub dov txias (tseem hu ua daim ntawv hauv paus) thiab kos raws li lub tshuab kev taw qhia. Tenter-frame film manufacturing siv ntau pawg ntawm cov yob los tsim cov zaj duab xis no.
Cov txheej txheem tenter-frame feem ntau ncab cov zaj duab xis 4.5: 1 hauv qhov kev taw qhia ntawm lub tshuab thiab 8.0: 1 hauv qhov kev taw qhia transverse. Txawm hais tias qhov ntawd, qhov piv tau hloov kho tau tag nrho.
Cov txheej txheem tenter-frame feem ntau siv ntau dua li cov qauv tubular. Nws tsim cov zaj duab xis ci ntsa iab thiab meej. Kev taw qhia biaxial ua rau muaj zog thiab ua rau muaj kev tawv zoo dua, pob tshab dua, thiab tiv taus roj thiab roj ntau.
Zaj duab xis BOPP kuj muaj cov yam ntxwv tiv thaiv pa thiab oxygen ntau dua. Kev tiv thaiv kev cuam tshuam thiab kev tawg yooj yim zoo dua nrog BOPP piv rau polypropylene shrink zaj duab xis.
Cov yeeb yaj kiab polypropylene uas muab qhwv rau ntawm ob sab feem ntau yog siv rau kev ntim khoom noj. Lawv hloov cov cellophane sai sai rau cov ntawv thov suav nrog cov khoom noj txom ncauj thiab cov ntawv ntim luam yeeb. Qhov no yog vim lawv cov khoom zoo dua thiab tus nqi qis dua.
Ntau lub tuam txhab xaiv siv BOPP hloov cov yeeb yaj kiab ntsws ib txwm muaj vim lawv muaj cov yam ntxwv zoo dua thiab muaj peev xwm zoo dua li cov yeeb yaj kiab ntim khoom yooj ywm.
Yuav tsum nco ntsoov tias kev kaw cua sov rau cov yeeb yaj kiab BOPP nyuaj heev. Txawm li cas los xij, qhov no tuaj yeem ua kom yooj yim dua los ntawm kev txheej cov yeeb yaj kiab tom qab ua tiav nrog cov khoom siv kaw cua sov lossis co-extruding nrog co-polymer ua ntej ua tiav. Qhov no yuav ua rau muaj ntau txheej zaj duab xis.
Lub sijhawm tshaj tawm: Plaub Hlis-04-2023