真空(kong)包裝的一(yi)種(zhong)變種(zhong)是(shi)充氣包裝。充氣(qi)包(bao)裝(zhuang)的主(zhu)要(yao)作(zuo)用(yong)(yong)除(chu)真(zhen)空包(bao)(bao)裝(zhuang)所具備(bei)的除(chu)氧保(bao)質功能外，主(zhu)要(yao)還有(you)(you)(you)抗壓、阻氣(qi)、保(bao)鮮(xian)等(deng)作(zuo)用(yong)(yong)，能更(geng)有(you)(you)(you)效(xiao) 地使食(shi)品(pin)(pin)長期保(bao)持(chi)原有(you)(you)(you)的色、香、味(wei)、形及營養價(jia)值。另(ling)外，有(you)(you)(you)許多食(shi)品(pin)(pin)不宜采用(yong)(yong)真(zhen)空包(bao)(bao)裝(zhuang)，而必須采用(yong)(yong)充(chong)氣(qi)包(bao)(bao)裝(zhuang)。如松脆易(yi)碎食(shi)品(pin)(pin)、易(yi)結(jie)塊食(shi)品(pin)(pin)、易(yi)變形走油食(shi)品(pin)(pin)、有(you)(you)(you)尖銳棱角或硬度較(jiao)高會(hui)刺破包(bao)(bao)裝(zhuang)袋的食(shi)品(pin)(pin)等(deng)。食(shi)品(pin)(pin)經食品真空包裝機抽氣(qi)包(bao)(bao)(bao)裝(zhuang)后，充入一些(xie)氣(qi)體，使包(bao)(bao)(bao)裝(zhuang)袋(dai)內充氣(qi)壓(ya)強大于包(bao)(bao)(bao)裝(zhuang)袋(dai)外(wai)大氣(qi)壓(ya)強，能有效地防止食品(pin)受(shou)壓(ya)破碎變形(xing)，并不(bu)影響包(bao)(bao)(bao)裝(zhuang)袋(dai)外(wai)觀及(ji)印刷裝(zhuang)潢。