PET zaj duab xis yog cov yeeb yaj kiab ncov qaumteb qabteb uas muaj 45 txog 50 dynes uas tsis kho qhov nro ntawm qhov chaw, uas yog, PET zaj duab xis yog cov yeeb yaj kiab uas muaj zog heev txawm hais tias hom yas number case luam tawm.
Txawm li cas los xij, tom qab ob-cov tshuaj tiv thaiv polyurethane nplaum siv, tom qab tib zaj yeeb yaj kiab yog qhuav-txheej txheem, tshwj xeeb yog tom qab laminated nrog PE zaj duab xis, luam ntawv txheej txheej yuav raug khuam rau PET kua nplaum ua rau ua kom tawg (txheej tuab PE). Qhov tshwm sim ntawm cov zaj duab xis nplaum kua nplaum yog qhov phem dua, uas yog, qhov tshwm sim tias kev luam ntawv number case ntawm PET zaj duab xis yog ib nrab lossis tag nrho pauv mus rau sab hauv zaj duab xis tom qab sib xyaw. Vim tias cov PET zaj duab xis muaj cov khoom zoo tshaj plaws thiab muaj tshuaj tiv thaiv zoo rau cov dej xau, cov kuab hnyav yog qhov nyuaj rau kev nkag, thiab cov pa hauv cov cuab yeej ntawm tus number case yog qis dua. Cov khoom siv sib txuas (cob) ntawm cov yas saum npoo luam ntawv kua mem tau muaj kev sib raug zoo nrog PET zaj duab xis, yog li cov luam ntawv ntawm PET zaj duab xis muaj kev nyab xeeb ntau dua li cov yas sib xyaw printing number case.