Rau cov khoom suav tsis txheeb, los ntawm cov kas fes gourmet mus rau cov tshuaj rhiab heev, oxygen yog thawj qhov ua rau degradation. Nws oxidizes rog, ua rau rancidity thiab tawm -flavors. Nws txhawb kev loj hlob ntawm microbial. Nws degrades cov vitamins thiab cov khoom xyaw nquag. Qhov zoo tshaj plaws riam phom tiv thaiv oxygen yog aluminium ntawv ci.
Peb cov qauv PET / AL / PE suav nrog cov txheej txheem aluminium ntawv ci uas muab qhov kev lag luam hu ua "kev txwv tsis pub." Tsis zoo li cov yeeb yaj kiab hlau uas txo qis kev sib kis ntawm cov pa oxygen tab sis tsis tshem tawm nws, aluminium foil txo Oxygen Transmission Rates (OTR) kom zoo xoom.
Qhov no ua tau li cas? Aluminium yog crystalline hlau. Nws cov qauv molecular yog tuab heev uas cov pa oxygen molecules - uas yog loj heev - tsuas yog tsis tuaj yeem hla ib daim ntawv txuas ntxiv ntawm cov ntawv ci. Qhov no yog ib qho khoom tseem ceeb ntawm lub cev, tsis yog kev thov kev ua haujlwm xwb.
Rau kas fes roasters, qhov no txhais tau hais tias taum khaws lawv cov roj tsw qab tsis tu ncua thaum lub hnab tseem kaw. Rau cov tuam txhab tshuaj, nws txhais tau hais tias kev ua tau zoo ntawm cov pa oxygen- cov tshuaj muaj txiaj ntsig tau lees paub. Rau cov khoom noj khoom haus, nws txhais tau tias lub neej txee ntsuas hauv xyoo, tsis yog hli.
Thaum koj cov khoom tsis tuaj yeem them taus ib qho kev cuam tshuam ntawm qhov tshiab, PET / AL / PE sawv ntsug- lub hnab ntim tsis yog ib qho kev xaiv xwb. Nws yog qhov tsim nyog.