Lub hnab nqus tsev vacuum, tseem hu ua aluminium- cov hnab yas sib xyaw lossis txo - lub hnab ntim siab, yog lub hnab ntim khoom raws li lub hauv paus ntsiab lus ntawm atmospheric siab. Lawv lub luag haujlwm tseem ceeb yog los tiv thaiv cov zaub mov lwj thiab oxidation los ntawm kev tshem cov pa oxygen ntawm lub hnab, yog li inhibiting kev loj hlob ntawm cov kab mob aerobic spoilage. Aluminium foil lub tshuab nqus tsev nqus tsev vacuum muaj cov khoom thaiv zoo, cua sov- sealing zog, thiab lub teeb - thaiv cov khoom.
Lub tshuab nqus tsev ntim tshuab hauv kuv lub tebchaws tau tsim tawm thaum xyoo 1980s. Thaum xyoo 1990, lub tshuab nqus tsev vacuum - tshuab ntim tshuab tau pib siv, uas suav nrog ntim lub hnab nrog cov pa roj xws li nitrogen lossis carbon dioxide tom qab nqus. Nrog rau kev txhawb nqa ntawm lub hnab ntim me me hauv kev ua lag luam thiab kev txhim kho ntawm cov khw muag khoom loj, nws cov ntawv thov yuav dhau los ua dav.
