Cov khoom siv yas rov ua dua tshiab
Txhua lub thawv yas muaj daim duab peb sab logo nrog 7 tus lej digital hauv. Txhua tus lej sawv cev rau ib hom khoom siv yas, uas zoo li "daim npav ID" rau cov khoom yas. Nws yog tsuas yog siv rau kev faib tawm thaum rov ua cov khoom yas. Nws yog tsim los ntawm cov koom haum cuam tshuam ntawm US plastics kev lag luam. Daim duab peb sab tsim los ntawm 3 xub txhais tau hais tias lub thawv yas rov ua dua thiab tsis txhais tau tias lub thawv yas tuaj yeem rov qab siv tau, thiab nws tsis sawv cev rau qib kev nyab xeeb ntawm lub thawv yas.
"1" sawv cev rau PET (polyethylene terephthalate), uas yog lub raj mis dej ntxhia thiab carbonated haus lub raj mis. Nws yog ib qho yooj yim rau deform thaum rhuab mus rau 70 degree thiab tsis haum rau tuav cov dej kub.
"2" stands rau HDPE (high-density polyethylene),uas feem ntau yog siv rau ntim cov kua xws li tshuaj ntxuav tes, tshuaj zawv plaub hau, tshuaj zawv plaub hau, cov roj siv tau, thiab tshuaj tua kab. Cov ntim khoom feem ntau yog semi-opaque thiab xav tias waxy. Tsis txhob siv nws ua lub khob dej lossis ua lub thawv rau lwm yam khoom.
"3" sawv cev rau PVC (polyvinyl chloride),uas feem ntau yog siv los ua cov kav dej, cov tsho los nag, cov hnab hauv tsev kawm ntawv, cov khoom siv hauv tsev, cov yeeb yaj kiab yas, cov thawv yas thiab lwm yam khoom siv.
"4" stands rau LDPE (tsawg-density polyethylene).Cov hnab yas thiab khoom noj khoom haus cling films feem ntau yog ua los ntawm LDPE.
"5" sawv cev rau PP (polypropylene),uas feem ntau yog siv los ua cov khoom ntim khoom noj thiab dej haus. Cov fwj cov kua mis ntau, yogurt fwj, kua txiv fwj, thiab lub thawv noj su hauv microwave muaj qhov melting point txog 167 degree thiab yog tib qho uas tuaj yeem muab tso rau hauv lub qhov cub microwave. Lub thawv yas tuaj yeem rov siv dua tom qab ntxuav.
"6" sawv cev rau PS (polystyrene),uas feem ntau yog siv los ua cov khoom siv hauv tsev, cov khoom ua si, cov ntawv sau, cov menyuam, thiab cov thawv khob lossis cov tais diav pov tseg rau cov khw noj mov ceev ceev los tuav dej qab zib. Feem ntau, muaj cov tais ntim cov noodle thawv thiab cov thawv ntim khoom noj ceev. Tsis txhob muab tso rau hauv lub qhov cub microwave rau cua sov, thiab tib lub sij hawm tsis txhob ntim cov zaub mov kub siab tshaj 80 degree.
"7" stands rau PC (polysulfate) thiab lwm yam ntaub ntawv.PC yog ib yam khoom uas siv los ntawm ntau qhov ntau thiab feem ntau yog siv los ua lub raj mis mis, khob qhov chaw, thiab lwm yam. PC tuaj yeem tso cov tshuaj lom bisphenol A ntawm qhov kub thiab txias, uas ua rau muaj kev phom sij rau tib neeg lub cev, yog li tsis txhob kub thaum siv nws.