真空包裝的一種變種是充氣(qi)包裝。充氣包裝的(de)主(zhu)(zhu)要作用(yong)(yong)除真空包裝(zhuang)(zhuang)所具備的(de)除氧保(bao)質(zhi)功能外(wai)，主(zhu)(zhu)要還(huan)有(you)(you)(you)抗壓、阻氣(qi)、保(bao)鮮等作用(yong)(yong)，能更有(you)(you)(you)效 地使食(shi)(shi)品(pin)長期保(bao)持原有(you)(you)(you)的(de)色、香、味(wei)、形及營養價值。另外(wai)，有(you)(you)(you)許多食(shi)(shi)品(pin)不宜采(cai)用(yong)(yong)真空包裝(zhuang)(zhuang)，而必須采(cai)用(yong)(yong)充(chong)氣(qi)包裝(zhuang)(zhuang)。如松(song)脆易碎(sui)食(shi)(shi)品(pin)、易結塊食(shi)(shi)品(pin)、易變形走油(you)食(shi)(shi)品(pin)、有(you)(you)(you)尖(jian)銳(rui)棱角或(huo)硬度較高會(hui)刺破(po)包裝(zhuang)(zhuang)袋(dai)的(de)食(shi)(shi)品(pin)等。食(shi)(shi)品(pin)經(jing)食品(pin)真空包裝機抽(chou)氣(qi)(qi)包(bao)(bao)裝(zhuang)(zhuang)后，充入一些(xie)氣(qi)(qi)體，使包(bao)(bao)裝(zhuang)(zhuang)袋內充氣(qi)(qi)壓強大于包(bao)(bao)裝(zhuang)(zhuang)袋外(wai)(wai)大氣(qi)(qi)壓強，能有(you)效地防止食品(pin)受壓破碎變形(xing)，并不影響包(bao)(bao)裝(zhuang)(zhuang)袋外(wai)(wai)觀及(ji)印刷裝(zhuang)(zhuang)潢。