Yakagadziriswa mamiriro ekunze ekuputika (mepu) ndeyekuiswa kwakagadzirwa pane hwaro hweVacuum uye nitrogen-yakazara-yakazara kurongedza. Pasi rese, tekinoroji yekuputika inowana chinangwa chekuchengetedza uye kuchengetedza nekuchinja iyo ambient mamiriro ezvinhu (mhepo) yakatenderedza chikafu chinonzi yakagadziriswa mamiriro ekunze. Inonyanya kushandiswa kuchengetedzwa kwechikafu. PP yakagadziridzwa matinheni ekuputika ine application izere mune iyo caping yeyakagadziriswa nyama, kofi nemiriwo. Nhasi, zviri kuwedzerawo kushandiswa mufriggerated uye zvakave zvakagadzirira chikafu chinoremerwa, kunyanya pakutakura kwekugadzira nyowani nyowani pork. Yakagadziridzwa matenga ekutakura gasi inonyanya kuumbwa neCarbon dioxide, nitrogen, okisijeni uye mamwe magasi akakosha akadai saNitrogen dioxide, Sarufa dioxide uye Argon. Iyo huru yekuchengetedza gasi, kabhoni dioxide, inogona kukanganisa kukura kweBacilli zvakanyanya uye fungi; oksijeni inogona kudzivirira kubereka kwemazhinji mabhakitiriya anaerobic, kuchengeta ruvara rwe nyama nemichero nemiriwo nyowani. Nitrogen, gasi rine unert, haiite ne kana kubatikana nechikafu. Iyo inoshandiswa segesi kuzadza gasi kudzivirira kutsvinya kwemapakeji kunokonzerwa nekupukunyuka magasi akadai se carbon dioxide. Zvikafu zvakasiyana nemichero zvine mimwe mimwe mimwe mimwe maumbirwo uye huwandu hwemasvikiya magasi. Kune ca yekukiya mabhokisi, inokoshesa kuti iyo okisijen eremegen inoenderana neyekufanofema chiyero.