Yog tias koj nug txog qhov ntom ntawm daim ntaub, nws nyob ntawm koj cov ntaub ntawv raw yog dab tsi. Qhov ntau dua ib qho yog polypropylene, uas yog qhov ntom ntawm PP ntawm 0.90 grams rau ib cubic centimeter, thiab qhov ntom ntawm PET yog 1.30-1.38 grams. Muaj qee pawg tsawg tsawg. Khoom ntwm cov khoom ua haujlwm yog nyob ntawm feem pua ntawm txhua feem
Lwm qhov kev tuaj yeem uas koj thov yog tias qhov nyhav ntawm cov ntaub npuag tsis yog qhov hnyav ntawm cov ntaub npuag tsis yog ntaub ntuag.
