真空包(bao)裝的一種(zhong)變種(zhong)是充氣包(bao)裝。充(chong)氣包裝的主(zhu)要作用(yong)除(chu)真空包(bao)裝(zhuang)所具備的除(chu)氧保(bao)質功能(neng)外，主(zhu)要還有(you)(you)抗壓、阻氣、保(bao)鮮等(deng)作用(yong)，能(neng)更有(you)(you)效 地使食(shi)(shi)(shi)(shi)品長期保(bao)持原(yuan)有(you)(you)的色、香、味、形(xing)(xing)及營養價值。另(ling)外，有(you)(you)許(xu)多食(shi)(shi)(shi)(shi)品不宜采用(yong)真空包(bao)裝(zhuang)，而必(bi)須(xu)采用(yong)充氣包(bao)裝(zhuang)。如松脆易(yi)碎食(shi)(shi)(shi)(shi)品、易(yi)結(jie)塊食(shi)(shi)(shi)(shi)品、易(yi)變形(xing)(xing)走油食(shi)(shi)(shi)(shi)品、有(you)(you)尖銳棱(leng)角或硬度較高(gao)會刺(ci)破包(bao)裝(zhuang)袋的食(shi)(shi)(shi)(shi)品等(deng)。食(shi)(shi)(shi)(shi)品經食(shi)品真空包裝(zhuang)機(ji)抽氣(qi)包裝后，充入一些氣(qi)體，使包裝袋(dai)(dai)內充氣(qi)壓(ya)(ya)(ya)強大于包裝袋(dai)(dai)外(wai)大氣(qi)壓(ya)(ya)(ya)強，能有效地防止食品(pin)受(shou)壓(ya)(ya)(ya)破碎變形，并(bing)不(bu)影響包裝袋(dai)(dai)外(wai)觀及印(yin)刷裝潢。